| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| |
| package java.util.prefs; |
| |
| import java.util.*; |
| import java.io.*; |
| import java.lang.Integer; |
| import java.lang.Long; |
| import java.lang.Float; |
| import java.lang.Double; |
| |
| /** |
| * This class provides a skeletal implementation of the {@link java.util.prefs.Preferences Preferences} |
| * class, greatly easing the task of implementing it. |
| * |
| * <p><strong>This class is for <tt>Preferences</tt> implementers only. |
| * Normal users of the <tt>Preferences</tt> facility should have no need to |
| * consult this documentation. The {@link java.util.prefs.Preferences Preferences} documentation |
| * should suffice.</strong> |
| * |
| * <p>Implementors must override the nine abstract service-provider interface |
| * (SPI) methods: {@link #getSpi(java.lang.String)}, {@link #putSpi(java.lang.String,java.lang.String)}, |
| * {@link #removeSpi(java.lang.String)}, {@link #childSpi(java.lang.String)}, {@link |
| * #removeNodeSpi()}, {@link #keysSpi()}, {@link #childrenNamesSpi()}, {@link |
| * #syncSpi()} and {@link #flushSpi()}. All of the concrete methods specify |
| * precisely how they are implemented atop these SPI methods. The implementor |
| * may, at his discretion, override one or more of the concrete methods if the |
| * default implementation is unsatisfactory for any reason, such as |
| * performance. |
| * |
| * <p>The SPI methods fall into three groups concerning exception |
| * behavior. The <tt>getSpi</tt> method should never throw exceptions, but it |
| * doesn't really matter, as any exception thrown by this method will be |
| * intercepted by {@link #get(java.lang.String,java.lang.String)}, which will return the specified |
| * default value to the caller. The <tt>removeNodeSpi, keysSpi, |
| * childrenNamesSpi, syncSpi</tt> and <tt>flushSpi</tt> methods are specified |
| * to throw {@link java.util.prefs.BackingStoreException BackingStoreException}, and the implementation is required |
| * to throw this checked exception if it is unable to perform the operation. |
| * The exception propagates outward, causing the corresponding API method |
| * to fail. |
| * |
| * <p>The remaining SPI methods {@link #putSpi(java.lang.String,java.lang.String)}, {@link |
| * #removeSpi(java.lang.String)} and {@link #childSpi(java.lang.String)} have more complicated |
| * exception behavior. They are not specified to throw |
| * <tt>BackingStoreException</tt>, as they can generally obey their contracts |
| * even if the backing store is unavailable. This is true because they return |
| * no information and their effects are not required to become permanent until |
| * a subsequent call to {@link java.util.prefs.Preferences#flush() Preferences#flush()} or |
| * {@link java.util.prefs.Preferences#sync() Preferences#sync()}. Generally speaking, these SPI methods should not |
| * throw exceptions. In some implementations, there may be circumstances |
| * under which these calls cannot even enqueue the requested operation for |
| * later processing. Even under these circumstances it is generally better to |
| * simply ignore the invocation and return, rather than throwing an |
| * exception. Under these circumstances, however, all subsequent invocations |
| * of <tt>flush()</tt> and <tt>sync</tt> should return <tt>false</tt>, as |
| * returning <tt>true</tt> would imply that all previous operations had |
| * successfully been made permanent. |
| * |
| * <p>There is one circumstance under which <tt>putSpi, removeSpi and |
| * childSpi</tt> <i>should</i> throw an exception: if the caller lacks |
| * sufficient privileges on the underlying operating system to perform the |
| * requested operation. This will, for instance, occur on most systems |
| * if a non-privileged user attempts to modify system preferences. |
| * (The required privileges will vary from implementation to |
| * implementation. On some implementations, they are the right to modify the |
| * contents of some directory in the file system; on others they are the right |
| * to modify contents of some key in a registry.) Under any of these |
| * circumstances, it would generally be undesirable to let the program |
| * continue executing as if these operations would become permanent at a later |
| * time. While implementations are not required to throw an exception under |
| * these circumstances, they are encouraged to do so. A {@link java.lang.SecurityException SecurityException} would be appropriate. |
| * |
| * <p>Most of the SPI methods require the implementation to read or write |
| * information at a preferences node. The implementor should beware of the |
| * fact that another VM may have concurrently deleted this node from the |
| * backing store. It is the implementation's responsibility to recreate the |
| * node if it has been deleted. |
| * |
| * <p>Implementation note: In Sun's default <tt>Preferences</tt> |
| * implementations, the user's identity is inherited from the underlying |
| * operating system and does not change for the lifetime of the virtual |
| * machine. It is recognized that server-side <tt>Preferences</tt> |
| * implementations may have the user identity change from request to request, |
| * implicitly passed to <tt>Preferences</tt> methods via the use of a |
| * static {@link java.lang.ThreadLocal ThreadLocal} instance. Authors of such implementations are |
| * <i>strongly</i> encouraged to determine the user at the time preferences |
| * are accessed (for example by the {@link #get(java.lang.String,java.lang.String)} or {@link |
| * #put(java.lang.String,java.lang.String)} method) rather than permanently associating a user |
| * with each <tt>Preferences</tt> instance. The latter behavior conflicts |
| * with normal <tt>Preferences</tt> usage and would lead to great confusion. |
| * |
| * @author Josh Bloch |
| * @see java.util.prefs.Preferences |
| * @since 1.4 |
| */ |
| |
| @SuppressWarnings({"unchecked", "deprecation", "all"}) |
| public abstract class AbstractPreferences extends java.util.prefs.Preferences { |
| |
| /** |
| * Creates a preference node with the specified parent and the specified |
| * name relative to its parent. |
| * |
| * @param parent the parent of this preference node, or null if this |
| * is the root. |
| * @param name the name of this preference node, relative to its parent, |
| * or <tt>""</tt> if this is the root. |
| * @throws java.lang.IllegalArgumentException if <tt>name</tt> contains a slash |
| * (<tt>'/'</tt>), or <tt>parent</tt> is <tt>null</tt> and |
| * name isn't <tt>""</tt>. |
| */ |
| |
| protected AbstractPreferences(java.util.prefs.AbstractPreferences parent, java.lang.String name) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>put</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#put(java.lang.String,java.lang.String) Preferences#put(String,String)}. |
| * |
| * <p>This implementation checks that the key and value are legal, |
| * obtains this preference node's lock, checks that the node |
| * has not been removed, invokes {@link #putSpi(java.lang.String,java.lang.String)}, and if |
| * there are any preference change listeners, enqueues a notification |
| * event for processing by the event dispatch thread. |
| * |
| * @param key key with which the specified value is to be associated. |
| * @param value value to be associated with the specified key. |
| * @throws java.lang.NullPointerException if key or value is <tt>null</tt>. |
| * @throws java.lang.IllegalArgumentException if <tt>key.length()</tt> exceeds |
| * <tt>MAX_KEY_LENGTH</tt> or if <tt>value.length</tt> exceeds |
| * <tt>MAX_VALUE_LENGTH</tt>. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| */ |
| |
| public void put(java.lang.String key, java.lang.String value) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>get</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#get(java.lang.String,java.lang.String) Preferences#get(String,String)}. |
| * |
| * <p>This implementation first checks to see if <tt>key</tt> is |
| * <tt>null</tt> throwing a <tt>NullPointerException</tt> if this is |
| * the case. Then it obtains this preference node's lock, |
| * checks that the node has not been removed, invokes {@link |
| * #getSpi(java.lang.String)}, and returns the result, unless the <tt>getSpi</tt> |
| * invocation returns <tt>null</tt> or throws an exception, in which case |
| * this invocation returns <tt>def</tt>. |
| * |
| * @param key key whose associated value is to be returned. |
| * @param def the value to be returned in the event that this |
| * preference node has no value associated with <tt>key</tt>. |
| * @return the value associated with <tt>key</tt>, or <tt>def</tt> |
| * if no value is associated with <tt>key</tt>. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| * @throws java.lang.NullPointerException if key is <tt>null</tt>. (A |
| * <tt>null</tt> default <i>is</i> permitted.) |
| */ |
| |
| public java.lang.String get(java.lang.String key, java.lang.String def) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>remove(String)</tt> method as per the specification |
| * in {@link java.util.prefs.Preferences#remove(java.lang.String) Preferences#remove(String)}. |
| * |
| * <p>This implementation obtains this preference node's lock, |
| * checks that the node has not been removed, invokes |
| * {@link #removeSpi(java.lang.String)} and if there are any preference |
| * change listeners, enqueues a notification event for processing by the |
| * event dispatch thread. |
| * |
| * @param key key whose mapping is to be removed from the preference node. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| * @throws java.lang.NullPointerException {@inheritDoc}. |
| */ |
| |
| public void remove(java.lang.String key) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>clear</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#clear() Preferences#clear()}. |
| * |
| * <p>This implementation obtains this preference node's lock, |
| * invokes {@link #keys()} to obtain an array of keys, and |
| * iterates over the array invoking {@link #remove(java.lang.String)} on each key. |
| * |
| * @throws java.util.prefs.BackingStoreException if this operation cannot be completed |
| * due to a failure in the backing store, or inability to |
| * communicate with it. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| */ |
| |
| public void clear() throws java.util.prefs.BackingStoreException { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>putInt</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#putInt(java.lang.String,int) Preferences#putInt(String,int)}. |
| * |
| * <p>This implementation translates <tt>value</tt> to a string with |
| * {@link java.lang.Integer#toString(int) Integer#toString(int)} and invokes {@link #put(java.lang.String,java.lang.String)} |
| * on the result. |
| * |
| * @param key key with which the string form of value is to be associated. |
| * @param value value whose string form is to be associated with key. |
| * @throws java.lang.NullPointerException if key is <tt>null</tt>. |
| * @throws java.lang.IllegalArgumentException if <tt>key.length()</tt> exceeds |
| * <tt>MAX_KEY_LENGTH</tt>. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| */ |
| |
| public void putInt(java.lang.String key, int value) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>getInt</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#getInt(java.lang.String,int) Preferences#getInt(String,int)}. |
| * |
| * <p>This implementation invokes {@link #get(java.lang.String,java.lang.String) <tt>get(key, |
| * null)</tt>}. If the return value is non-null, the implementation |
| * attempts to translate it to an <tt>int</tt> with |
| * {@link java.lang.Integer#parseInt(java.lang.String) Integer#parseInt(String)}. If the attempt succeeds, the return |
| * value is returned by this method. Otherwise, <tt>def</tt> is returned. |
| * |
| * @param key key whose associated value is to be returned as an int. |
| * @param def the value to be returned in the event that this |
| * preference node has no value associated with <tt>key</tt> |
| * or the associated value cannot be interpreted as an int. |
| * @return the int value represented by the string associated with |
| * <tt>key</tt> in this preference node, or <tt>def</tt> if the |
| * associated value does not exist or cannot be interpreted as |
| * an int. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| * @throws java.lang.NullPointerException if <tt>key</tt> is <tt>null</tt>. |
| */ |
| |
| public int getInt(java.lang.String key, int def) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>putLong</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#putLong(java.lang.String,long) Preferences#putLong(String,long)}. |
| * |
| * <p>This implementation translates <tt>value</tt> to a string with |
| * {@link java.lang.Long#toString(long) Long#toString(long)} and invokes {@link #put(java.lang.String,java.lang.String)} |
| * on the result. |
| * |
| * @param key key with which the string form of value is to be associated. |
| * @param value value whose string form is to be associated with key. |
| * @throws java.lang.NullPointerException if key is <tt>null</tt>. |
| * @throws java.lang.IllegalArgumentException if <tt>key.length()</tt> exceeds |
| * <tt>MAX_KEY_LENGTH</tt>. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| */ |
| |
| public void putLong(java.lang.String key, long value) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>getLong</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#getLong(java.lang.String,long) Preferences#getLong(String,long)}. |
| * |
| * <p>This implementation invokes {@link #get(java.lang.String,java.lang.String) <tt>get(key, |
| * null)</tt>}. If the return value is non-null, the implementation |
| * attempts to translate it to a <tt>long</tt> with |
| * {@link java.lang.Long#parseLong(java.lang.String) Long#parseLong(String)}. If the attempt succeeds, the return |
| * value is returned by this method. Otherwise, <tt>def</tt> is returned. |
| * |
| * @param key key whose associated value is to be returned as a long. |
| * @param def the value to be returned in the event that this |
| * preference node has no value associated with <tt>key</tt> |
| * or the associated value cannot be interpreted as a long. |
| * @return the long value represented by the string associated with |
| * <tt>key</tt> in this preference node, or <tt>def</tt> if the |
| * associated value does not exist or cannot be interpreted as |
| * a long. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| * @throws java.lang.NullPointerException if <tt>key</tt> is <tt>null</tt>. |
| */ |
| |
| public long getLong(java.lang.String key, long def) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>putBoolean</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#putBoolean(java.lang.String,boolean) Preferences#putBoolean(String,boolean)}. |
| * |
| * <p>This implementation translates <tt>value</tt> to a string with |
| * {@link java.lang.String#valueOf(boolean) String#valueOf(boolean)} and invokes {@link #put(java.lang.String,java.lang.String)} |
| * on the result. |
| * |
| * @param key key with which the string form of value is to be associated. |
| * @param value value whose string form is to be associated with key. |
| * @throws java.lang.NullPointerException if key is <tt>null</tt>. |
| * @throws java.lang.IllegalArgumentException if <tt>key.length()</tt> exceeds |
| * <tt>MAX_KEY_LENGTH</tt>. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| */ |
| |
| public void putBoolean(java.lang.String key, boolean value) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>getBoolean</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#getBoolean(java.lang.String,boolean) Preferences#getBoolean(String,boolean)}. |
| * |
| * <p>This implementation invokes {@link #get(java.lang.String,java.lang.String) <tt>get(key, |
| * null)</tt>}. If the return value is non-null, it is compared with |
| * <tt>"true"</tt> using {@link java.lang.String#equalsIgnoreCase(java.lang.String) String#equalsIgnoreCase(String)}. If the |
| * comparison returns <tt>true</tt>, this invocation returns |
| * <tt>true</tt>. Otherwise, the original return value is compared with |
| * <tt>"false"</tt>, again using {@link java.lang.String#equalsIgnoreCase(java.lang.String) String#equalsIgnoreCase(String)}. |
| * If the comparison returns <tt>true</tt>, this invocation returns |
| * <tt>false</tt>. Otherwise, this invocation returns <tt>def</tt>. |
| * |
| * @param key key whose associated value is to be returned as a boolean. |
| * @param def the value to be returned in the event that this |
| * preference node has no value associated with <tt>key</tt> |
| * or the associated value cannot be interpreted as a boolean. |
| * @return the boolean value represented by the string associated with |
| * <tt>key</tt> in this preference node, or <tt>def</tt> if the |
| * associated value does not exist or cannot be interpreted as |
| * a boolean. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| * @throws java.lang.NullPointerException if <tt>key</tt> is <tt>null</tt>. |
| */ |
| |
| public boolean getBoolean(java.lang.String key, boolean def) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>putFloat</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#putFloat(java.lang.String,float) Preferences#putFloat(String,float)}. |
| * |
| * <p>This implementation translates <tt>value</tt> to a string with |
| * {@link java.lang.Float#toString(float) Float#toString(float)} and invokes {@link #put(java.lang.String,java.lang.String)} |
| * on the result. |
| * |
| * @param key key with which the string form of value is to be associated. |
| * @param value value whose string form is to be associated with key. |
| * @throws java.lang.NullPointerException if key is <tt>null</tt>. |
| * @throws java.lang.IllegalArgumentException if <tt>key.length()</tt> exceeds |
| * <tt>MAX_KEY_LENGTH</tt>. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| */ |
| |
| public void putFloat(java.lang.String key, float value) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>getFloat</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#getFloat(java.lang.String,float) Preferences#getFloat(String,float)}. |
| * |
| * <p>This implementation invokes {@link #get(java.lang.String,java.lang.String) <tt>get(key, |
| * null)</tt>}. If the return value is non-null, the implementation |
| * attempts to translate it to an <tt>float</tt> with |
| * {@link java.lang.Float#parseFloat(java.lang.String) Float#parseFloat(String)}. If the attempt succeeds, the return |
| * value is returned by this method. Otherwise, <tt>def</tt> is returned. |
| * |
| * @param key key whose associated value is to be returned as a float. |
| * @param def the value to be returned in the event that this |
| * preference node has no value associated with <tt>key</tt> |
| * or the associated value cannot be interpreted as a float. |
| * @return the float value represented by the string associated with |
| * <tt>key</tt> in this preference node, or <tt>def</tt> if the |
| * associated value does not exist or cannot be interpreted as |
| * a float. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| * @throws java.lang.NullPointerException if <tt>key</tt> is <tt>null</tt>. |
| */ |
| |
| public float getFloat(java.lang.String key, float def) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>putDouble</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#putDouble(java.lang.String,double) Preferences#putDouble(String,double)}. |
| * |
| * <p>This implementation translates <tt>value</tt> to a string with |
| * {@link java.lang.Double#toString(double) Double#toString(double)} and invokes {@link #put(java.lang.String,java.lang.String)} |
| * on the result. |
| * |
| * @param key key with which the string form of value is to be associated. |
| * @param value value whose string form is to be associated with key. |
| * @throws java.lang.NullPointerException if key is <tt>null</tt>. |
| * @throws java.lang.IllegalArgumentException if <tt>key.length()</tt> exceeds |
| * <tt>MAX_KEY_LENGTH</tt>. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| */ |
| |
| public void putDouble(java.lang.String key, double value) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>getDouble</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#getDouble(java.lang.String,double) Preferences#getDouble(String,double)}. |
| * |
| * <p>This implementation invokes {@link #get(java.lang.String,java.lang.String) <tt>get(key, |
| * null)</tt>}. If the return value is non-null, the implementation |
| * attempts to translate it to an <tt>double</tt> with |
| * {@link java.lang.Double#parseDouble(java.lang.String) Double#parseDouble(String)}. If the attempt succeeds, the return |
| * value is returned by this method. Otherwise, <tt>def</tt> is returned. |
| * |
| * @param key key whose associated value is to be returned as a double. |
| * @param def the value to be returned in the event that this |
| * preference node has no value associated with <tt>key</tt> |
| * or the associated value cannot be interpreted as a double. |
| * @return the double value represented by the string associated with |
| * <tt>key</tt> in this preference node, or <tt>def</tt> if the |
| * associated value does not exist or cannot be interpreted as |
| * a double. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| * @throws java.lang.NullPointerException if <tt>key</tt> is <tt>null</tt>. |
| */ |
| |
| public double getDouble(java.lang.String key, double def) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>putByteArray</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#putByteArray(java.lang.String,byte[]) Preferences#putByteArray(String,byte[])}. |
| * |
| * @param key key with which the string form of value is to be associated. |
| * @param value value whose string form is to be associated with key. |
| * @throws java.lang.NullPointerException if key or value is <tt>null</tt>. |
| * @throws java.lang.IllegalArgumentException if key.length() exceeds MAX_KEY_LENGTH |
| * or if value.length exceeds MAX_VALUE_LENGTH*3/4. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| */ |
| |
| public void putByteArray(java.lang.String key, byte[] value) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>getByteArray</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#getByteArray(java.lang.String,byte[]) Preferences#getByteArray(String,byte[])}. |
| * |
| * @param key key whose associated value is to be returned as a byte array. |
| * @param def the value to be returned in the event that this |
| * preference node has no value associated with <tt>key</tt> |
| * or the associated value cannot be interpreted as a byte array. |
| * @return the byte array value represented by the string associated with |
| * <tt>key</tt> in this preference node, or <tt>def</tt> if the |
| * associated value does not exist or cannot be interpreted as |
| * a byte array. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| * @throws java.lang.NullPointerException if <tt>key</tt> is <tt>null</tt>. (A |
| * <tt>null</tt> value for <tt>def</tt> <i>is</i> permitted.) |
| */ |
| |
| public byte[] getByteArray(java.lang.String key, byte[] def) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>keys</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#keys() Preferences#keys()}. |
| * |
| * <p>This implementation obtains this preference node's lock, checks that |
| * the node has not been removed and invokes {@link #keysSpi()}. |
| * |
| * @return an array of the keys that have an associated value in this |
| * preference node. |
| * @throws java.util.prefs.BackingStoreException if this operation cannot be completed |
| * due to a failure in the backing store, or inability to |
| * communicate with it. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| */ |
| |
| public java.lang.String[] keys() throws java.util.prefs.BackingStoreException { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>children</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#childrenNames() Preferences#childrenNames()}. |
| * |
| * <p>This implementation obtains this preference node's lock, checks that |
| * the node has not been removed, constructs a <tt>TreeSet</tt> initialized |
| * to the names of children already cached (the children in this node's |
| * "child-cache"), invokes {@link #childrenNamesSpi()}, and adds all of the |
| * returned child-names into the set. The elements of the tree set are |
| * dumped into a <tt>String</tt> array using the <tt>toArray</tt> method, |
| * and this array is returned. |
| * |
| * @return the names of the children of this preference node. |
| * @throws java.util.prefs.BackingStoreException if this operation cannot be completed |
| * due to a failure in the backing store, or inability to |
| * communicate with it. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| * @see #cachedChildren() |
| */ |
| |
| public java.lang.String[] childrenNames() throws java.util.prefs.BackingStoreException { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Returns all known unremoved children of this node. |
| * |
| * @return all known unremoved children of this node. |
| */ |
| |
| protected final java.util.prefs.AbstractPreferences[] cachedChildren() { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>parent</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#parent() Preferences#parent()}. |
| * |
| * <p>This implementation obtains this preference node's lock, checks that |
| * the node has not been removed and returns the parent value that was |
| * passed to this node's constructor. |
| * |
| * @return the parent of this preference node. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| */ |
| |
| public java.util.prefs.Preferences parent() { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>node</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#node(java.lang.String) Preferences#node(String)}. |
| * |
| * <p>This implementation obtains this preference node's lock and checks |
| * that the node has not been removed. If <tt>path</tt> is <tt>""</tt>, |
| * this node is returned; if <tt>path</tt> is <tt>"/"</tt>, this node's |
| * root is returned. If the first character in <tt>path</tt> is |
| * not <tt>'/'</tt>, the implementation breaks <tt>path</tt> into |
| * tokens and recursively traverses the path from this node to the |
| * named node, "consuming" a name and a slash from <tt>path</tt> at |
| * each step of the traversal. At each step, the current node is locked |
| * and the node's child-cache is checked for the named node. If it is |
| * not found, the name is checked to make sure its length does not |
| * exceed <tt>MAX_NAME_LENGTH</tt>. Then the {@link #childSpi(java.lang.String)} |
| * method is invoked, and the result stored in this node's child-cache. |
| * If the newly created <tt>Preferences</tt> object's {@link #newNode} |
| * field is <tt>true</tt> and there are any node change listeners, |
| * a notification event is enqueued for processing by the event dispatch |
| * thread. |
| * |
| * <p>When there are no more tokens, the last value found in the |
| * child-cache or returned by <tt>childSpi</tt> is returned by this |
| * method. If during the traversal, two <tt>"/"</tt> tokens occur |
| * consecutively, or the final token is <tt>"/"</tt> (rather than a name), |
| * an appropriate <tt>IllegalArgumentException</tt> is thrown. |
| * |
| * <p> If the first character of <tt>path</tt> is <tt>'/'</tt> |
| * (indicating an absolute path name) this preference node's |
| * lock is dropped prior to breaking <tt>path</tt> into tokens, and |
| * this method recursively traverses the path starting from the root |
| * (rather than starting from this node). The traversal is otherwise |
| * identical to the one described for relative path names. Dropping |
| * the lock on this node prior to commencing the traversal at the root |
| * node is essential to avoid the possibility of deadlock, as per the |
| * {@link #lock locking invariant}. |
| * |
| * @param path the path name of the preference node to return. |
| * @return the specified preference node. |
| * @throws java.lang.IllegalArgumentException if the path name is invalid (i.e., |
| * it contains multiple consecutive slash characters, or ends |
| * with a slash character and is more than one character long). |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| */ |
| |
| public java.util.prefs.Preferences node(java.lang.String path) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>nodeExists</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#nodeExists(java.lang.String) Preferences#nodeExists(String)}. |
| * |
| * <p>This implementation is very similar to {@link #node(java.lang.String)}, |
| * except that {@link #getChild(java.lang.String)} is used instead of {@link |
| * #childSpi(java.lang.String)}. |
| * |
| * @param path the path name of the node whose existence is to be checked. |
| * @return true if the specified node exists. |
| * @throws java.util.prefs.BackingStoreException if this operation cannot be completed |
| * due to a failure in the backing store, or inability to |
| * communicate with it. |
| * @throws java.lang.IllegalArgumentException if the path name is invalid (i.e., |
| * it contains multiple consecutive slash characters, or ends |
| * with a slash character and is more than one character long). |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method and |
| * <tt>pathname</tt> is not the empty string (<tt>""</tt>). |
| */ |
| |
| public boolean nodeExists(java.lang.String path) throws java.util.prefs.BackingStoreException { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>removeNode()</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#removeNode() Preferences#removeNode()}. |
| * |
| * <p>This implementation checks to see that this node is the root; if so, |
| * it throws an appropriate exception. Then, it locks this node's parent, |
| * and calls a recursive helper method that traverses the subtree rooted at |
| * this node. The recursive method locks the node on which it was called, |
| * checks that it has not already been removed, and then ensures that all |
| * of its children are cached: The {@link #childrenNamesSpi()} method is |
| * invoked and each returned child name is checked for containment in the |
| * child-cache. If a child is not already cached, the {@link |
| * #childSpi(java.lang.String)} method is invoked to create a <tt>Preferences</tt> |
| * instance for it, and this instance is put into the child-cache. Then |
| * the helper method calls itself recursively on each node contained in its |
| * child-cache. Next, it invokes {@link #removeNodeSpi()}, marks itself |
| * as removed, and removes itself from its parent's child-cache. Finally, |
| * if there are any node change listeners, it enqueues a notification |
| * event for processing by the event dispatch thread. |
| * |
| * <p>Note that the helper method is always invoked with all ancestors up |
| * to the "closest non-removed ancestor" locked. |
| * |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has already |
| * been removed with the {@link #removeNode()} method. |
| * @throws java.lang.UnsupportedOperationException if this method is invoked on |
| * the root node. |
| * @throws java.util.prefs.BackingStoreException if this operation cannot be completed |
| * due to a failure in the backing store, or inability to |
| * communicate with it. |
| */ |
| |
| public void removeNode() throws java.util.prefs.BackingStoreException { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>name</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#name() Preferences#name()}. |
| * |
| * <p>This implementation merely returns the name that was |
| * passed to this node's constructor. |
| * |
| * @return this preference node's name, relative to its parent. |
| */ |
| |
| public java.lang.String name() { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>absolutePath</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#absolutePath() Preferences#absolutePath()}. |
| * |
| * <p>This implementation merely returns the absolute path name that |
| * was computed at the time that this node was constructed (based on |
| * the name that was passed to this node's constructor, and the names |
| * that were passed to this node's ancestors' constructors). |
| * |
| * @return this preference node's absolute path name. |
| */ |
| |
| public java.lang.String absolutePath() { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>isUserNode</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#isUserNode() Preferences#isUserNode()}. |
| * |
| * <p>This implementation compares this node's root node (which is stored |
| * in a private field) with the value returned by |
| * {@link java.util.prefs.Preferences#userRoot() Preferences#userRoot()}. If the two object references are |
| * identical, this method returns true. |
| * |
| * @return <tt>true</tt> if this preference node is in the user |
| * preference tree, <tt>false</tt> if it's in the system |
| * preference tree. |
| */ |
| |
| public boolean isUserNode() { throw new RuntimeException("Stub!"); } |
| |
| public void addPreferenceChangeListener(java.util.prefs.PreferenceChangeListener pcl) { throw new RuntimeException("Stub!"); } |
| |
| public void removePreferenceChangeListener(java.util.prefs.PreferenceChangeListener pcl) { throw new RuntimeException("Stub!"); } |
| |
| public void addNodeChangeListener(java.util.prefs.NodeChangeListener ncl) { throw new RuntimeException("Stub!"); } |
| |
| public void removeNodeChangeListener(java.util.prefs.NodeChangeListener ncl) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Put the given key-value association into this preference node. It is |
| * guaranteed that <tt>key</tt> and <tt>value</tt> are non-null and of |
| * legal length. Also, it is guaranteed that this node has not been |
| * removed. (The implementor needn't check for any of these things.) |
| * |
| * <p>This method is invoked with the lock on this node held. |
| * @param key the key |
| * @param value the value |
| */ |
| |
| protected abstract void putSpi(java.lang.String key, java.lang.String value); |
| |
| /** |
| * Return the value associated with the specified key at this preference |
| * node, or <tt>null</tt> if there is no association for this key, or the |
| * association cannot be determined at this time. It is guaranteed that |
| * <tt>key</tt> is non-null. Also, it is guaranteed that this node has |
| * not been removed. (The implementor needn't check for either of these |
| * things.) |
| * |
| * <p> Generally speaking, this method should not throw an exception |
| * under any circumstances. If, however, if it does throw an exception, |
| * the exception will be intercepted and treated as a <tt>null</tt> |
| * return value. |
| * |
| * <p>This method is invoked with the lock on this node held. |
| * |
| * @param key the key |
| * @return the value associated with the specified key at this preference |
| * node, or <tt>null</tt> if there is no association for this |
| * key, or the association cannot be determined at this time. |
| */ |
| |
| protected abstract java.lang.String getSpi(java.lang.String key); |
| |
| /** |
| * Remove the association (if any) for the specified key at this |
| * preference node. It is guaranteed that <tt>key</tt> is non-null. |
| * Also, it is guaranteed that this node has not been removed. |
| * (The implementor needn't check for either of these things.) |
| * |
| * <p>This method is invoked with the lock on this node held. |
| * @param key the key |
| */ |
| |
| protected abstract void removeSpi(java.lang.String key); |
| |
| /** |
| * Removes this preference node, invalidating it and any preferences that |
| * it contains. The named child will have no descendants at the time this |
| * invocation is made (i.e., the {@link java.util.prefs.Preferences#removeNode() Preferences#removeNode()} method |
| * invokes this method repeatedly in a bottom-up fashion, removing each of |
| * a node's descendants before removing the node itself). |
| * |
| * <p>This method is invoked with the lock held on this node and its |
| * parent (and all ancestors that are being removed as a |
| * result of a single invocation to {@link java.util.prefs.Preferences#removeNode() Preferences#removeNode()}). |
| * |
| * <p>The removal of a node needn't become persistent until the |
| * <tt>flush</tt> method is invoked on this node (or an ancestor). |
| * |
| * <p>If this node throws a <tt>BackingStoreException</tt>, the exception |
| * will propagate out beyond the enclosing {@link #removeNode()} |
| * invocation. |
| * |
| * @throws java.util.prefs.BackingStoreException if this operation cannot be completed |
| * due to a failure in the backing store, or inability to |
| * communicate with it. |
| */ |
| |
| protected abstract void removeNodeSpi() throws java.util.prefs.BackingStoreException; |
| |
| /** |
| * Returns all of the keys that have an associated value in this |
| * preference node. (The returned array will be of size zero if |
| * this node has no preferences.) It is guaranteed that this node has not |
| * been removed. |
| * |
| * <p>This method is invoked with the lock on this node held. |
| * |
| * <p>If this node throws a <tt>BackingStoreException</tt>, the exception |
| * will propagate out beyond the enclosing {@link #keys()} invocation. |
| * |
| * @return an array of the keys that have an associated value in this |
| * preference node. |
| * @throws java.util.prefs.BackingStoreException if this operation cannot be completed |
| * due to a failure in the backing store, or inability to |
| * communicate with it. |
| */ |
| |
| protected abstract java.lang.String[] keysSpi() throws java.util.prefs.BackingStoreException; |
| |
| /** |
| * Returns the names of the children of this preference node. (The |
| * returned array will be of size zero if this node has no children.) |
| * This method need not return the names of any nodes already cached, |
| * but may do so without harm. |
| * |
| * <p>This method is invoked with the lock on this node held. |
| * |
| * <p>If this node throws a <tt>BackingStoreException</tt>, the exception |
| * will propagate out beyond the enclosing {@link #childrenNames()} |
| * invocation. |
| * |
| * @return an array containing the names of the children of this |
| * preference node. |
| * @throws java.util.prefs.BackingStoreException if this operation cannot be completed |
| * due to a failure in the backing store, or inability to |
| * communicate with it. |
| */ |
| |
| protected abstract java.lang.String[] childrenNamesSpi() throws java.util.prefs.BackingStoreException; |
| |
| /** |
| * Returns the named child if it exists, or <tt>null</tt> if it does not. |
| * It is guaranteed that <tt>nodeName</tt> is non-null, non-empty, |
| * does not contain the slash character ('/'), and is no longer than |
| * {@link #MAX_NAME_LENGTH} characters. Also, it is guaranteed |
| * that this node has not been removed. (The implementor needn't check |
| * for any of these things if he chooses to override this method.) |
| * |
| * <p>Finally, it is guaranteed that the named node has not been returned |
| * by a previous invocation of this method or {@link #childSpi} after the |
| * last time that it was removed. In other words, a cached value will |
| * always be used in preference to invoking this method. (The implementor |
| * needn't maintain his own cache of previously returned children if he |
| * chooses to override this method.) |
| * |
| * <p>This implementation obtains this preference node's lock, invokes |
| * {@link #childrenNames()} to get an array of the names of this node's |
| * children, and iterates over the array comparing the name of each child |
| * with the specified node name. If a child node has the correct name, |
| * the {@link #childSpi(java.lang.String)} method is invoked and the resulting |
| * node is returned. If the iteration completes without finding the |
| * specified name, <tt>null</tt> is returned. |
| * |
| * @param nodeName name of the child to be searched for. |
| * @return the named child if it exists, or null if it does not. |
| * @throws java.util.prefs.BackingStoreException if this operation cannot be completed |
| * due to a failure in the backing store, or inability to |
| * communicate with it. |
| */ |
| |
| protected java.util.prefs.AbstractPreferences getChild(java.lang.String nodeName) throws java.util.prefs.BackingStoreException { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Returns the named child of this preference node, creating it if it does |
| * not already exist. It is guaranteed that <tt>name</tt> is non-null, |
| * non-empty, does not contain the slash character ('/'), and is no longer |
| * than {@link #MAX_NAME_LENGTH} characters. Also, it is guaranteed that |
| * this node has not been removed. (The implementor needn't check for any |
| * of these things.) |
| * |
| * <p>Finally, it is guaranteed that the named node has not been returned |
| * by a previous invocation of this method or {@link #getChild(java.lang.String)} |
| * after the last time that it was removed. In other words, a cached |
| * value will always be used in preference to invoking this method. |
| * Subclasses need not maintain their own cache of previously returned |
| * children. |
| * |
| * <p>The implementer must ensure that the returned node has not been |
| * removed. If a like-named child of this node was previously removed, the |
| * implementer must return a newly constructed <tt>AbstractPreferences</tt> |
| * node; once removed, an <tt>AbstractPreferences</tt> node |
| * cannot be "resuscitated." |
| * |
| * <p>If this method causes a node to be created, this node is not |
| * guaranteed to be persistent until the <tt>flush</tt> method is |
| * invoked on this node or one of its ancestors (or descendants). |
| * |
| * <p>This method is invoked with the lock on this node held. |
| * |
| * @param name The name of the child node to return, relative to |
| * this preference node. |
| * @return The named child node. |
| */ |
| |
| protected abstract java.util.prefs.AbstractPreferences childSpi(java.lang.String name); |
| |
| /** |
| * Returns the absolute path name of this preferences node. |
| */ |
| |
| public java.lang.String toString() { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>sync</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#sync() Preferences#sync()}. |
| * |
| * <p>This implementation calls a recursive helper method that locks this |
| * node, invokes syncSpi() on it, unlocks this node, and recursively |
| * invokes this method on each "cached child." A cached child is a child |
| * of this node that has been created in this VM and not subsequently |
| * removed. In effect, this method does a depth first traversal of the |
| * "cached subtree" rooted at this node, calling syncSpi() on each node in |
| * the subTree while only that node is locked. Note that syncSpi() is |
| * invoked top-down. |
| * |
| * @throws java.util.prefs.BackingStoreException if this operation cannot be completed |
| * due to a failure in the backing store, or inability to |
| * communicate with it. |
| * @throws java.lang.IllegalStateException if this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| * @see #flush() |
| */ |
| |
| public void sync() throws java.util.prefs.BackingStoreException { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * This method is invoked with this node locked. The contract of this |
| * method is to synchronize any cached preferences stored at this node |
| * with any stored in the backing store. (It is perfectly possible that |
| * this node does not exist on the backing store, either because it has |
| * been deleted by another VM, or because it has not yet been created.) |
| * Note that this method should <i>not</i> synchronize the preferences in |
| * any subnodes of this node. If the backing store naturally syncs an |
| * entire subtree at once, the implementer is encouraged to override |
| * sync(), rather than merely overriding this method. |
| * |
| * <p>If this node throws a <tt>BackingStoreException</tt>, the exception |
| * will propagate out beyond the enclosing {@link #sync()} invocation. |
| * |
| * @throws java.util.prefs.BackingStoreException if this operation cannot be completed |
| * due to a failure in the backing store, or inability to |
| * communicate with it. |
| */ |
| |
| protected abstract void syncSpi() throws java.util.prefs.BackingStoreException; |
| |
| /** |
| * Implements the <tt>flush</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#flush() Preferences#flush()}. |
| * |
| * <p>This implementation calls a recursive helper method that locks this |
| * node, invokes flushSpi() on it, unlocks this node, and recursively |
| * invokes this method on each "cached child." A cached child is a child |
| * of this node that has been created in this VM and not subsequently |
| * removed. In effect, this method does a depth first traversal of the |
| * "cached subtree" rooted at this node, calling flushSpi() on each node in |
| * the subTree while only that node is locked. Note that flushSpi() is |
| * invoked top-down. |
| * |
| * <p> If this method is invoked on a node that has been removed with |
| * the {@link #removeNode()} method, flushSpi() is invoked on this node, |
| * but not on others. |
| * |
| * @throws java.util.prefs.BackingStoreException if this operation cannot be completed |
| * due to a failure in the backing store, or inability to |
| * communicate with it. |
| * @see #flush() |
| */ |
| |
| public void flush() throws java.util.prefs.BackingStoreException { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * This method is invoked with this node locked. The contract of this |
| * method is to force any cached changes in the contents of this |
| * preference node to the backing store, guaranteeing their persistence. |
| * (It is perfectly possible that this node does not exist on the backing |
| * store, either because it has been deleted by another VM, or because it |
| * has not yet been created.) Note that this method should <i>not</i> |
| * flush the preferences in any subnodes of this node. If the backing |
| * store naturally flushes an entire subtree at once, the implementer is |
| * encouraged to override flush(), rather than merely overriding this |
| * method. |
| * |
| * <p>If this node throws a <tt>BackingStoreException</tt>, the exception |
| * will propagate out beyond the enclosing {@link #flush()} invocation. |
| * |
| * @throws java.util.prefs.BackingStoreException if this operation cannot be completed |
| * due to a failure in the backing store, or inability to |
| * communicate with it. |
| */ |
| |
| protected abstract void flushSpi() throws java.util.prefs.BackingStoreException; |
| |
| /** |
| * Returns <tt>true</tt> iff this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. This method |
| * locks this node prior to returning the contents of the private |
| * field used to track this state. |
| * |
| * @return <tt>true</tt> iff this node (or an ancestor) has been |
| * removed with the {@link #removeNode()} method. |
| */ |
| |
| protected boolean isRemoved() { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>exportNode</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#exportNode(java.io.OutputStream) Preferences#exportNode(OutputStream)}. |
| * |
| * @param os the output stream on which to emit the XML document. |
| * @throws java.io.IOException if writing to the specified output stream |
| * results in an <tt>IOException</tt>. |
| * @throws java.util.prefs.BackingStoreException if preference data cannot be read from |
| * backing store. |
| */ |
| |
| public void exportNode(java.io.OutputStream os) throws java.util.prefs.BackingStoreException, java.io.IOException { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Implements the <tt>exportSubtree</tt> method as per the specification in |
| * {@link java.util.prefs.Preferences#exportSubtree(java.io.OutputStream) Preferences#exportSubtree(OutputStream)}. |
| * |
| * @param os the output stream on which to emit the XML document. |
| * @throws java.io.IOException if writing to the specified output stream |
| * results in an <tt>IOException</tt>. |
| * @throws java.util.prefs.BackingStoreException if preference data cannot be read from |
| * backing store. |
| */ |
| |
| public void exportSubtree(java.io.OutputStream os) throws java.util.prefs.BackingStoreException, java.io.IOException { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * An object whose monitor is used to lock this node. This object |
| * is used in preference to the node itself to reduce the likelihood of |
| * intentional or unintentional denial of service due to a locked node. |
| * To avoid deadlock, a node is <i>never</i> locked by a thread that |
| * holds a lock on a descendant of that node. |
| */ |
| |
| protected final java.lang.Object lock; |
| { lock = null; } |
| |
| /** |
| * This field should be <tt>true</tt> if this node did not exist in the |
| * backing store prior to the creation of this object. The field |
| * is initialized to false, but may be set to true by a subclass |
| * constructor (and should not be modified thereafter). This field |
| * indicates whether a node change event should be fired when |
| * creation is complete. |
| */ |
| |
| protected boolean newNode = false; |
| } |
| |
