| /* |
| * Copyright (c) 1997, 2008, 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 javax.swing.text; |
| |
| import java.util.Hashtable; |
| import java.util.Enumeration; |
| import java.util.Collections; |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.io.Serializable; |
| |
| /** |
| * A straightforward implementation of MutableAttributeSet using a |
| * hash table. |
| * <p> |
| * <strong>Warning:</strong> |
| * Serialized objects of this class will not be compatible with |
| * future Swing releases. The current serialization support is |
| * appropriate for short term storage or RMI between applications running |
| * the same version of Swing. As of 1.4, support for long term storage |
| * of all JavaBeans<sup><font size="-2">TM</font></sup> |
| * has been added to the <code>java.beans</code> package. |
| * Please see {@link java.beans.XMLEncoder}. |
| * |
| * @author Tim Prinzing |
| */ |
| public class SimpleAttributeSet implements MutableAttributeSet, Serializable, Cloneable |
| { |
| private static final long serialVersionUID = -6631553454711782652L; |
| |
| /** |
| * An empty attribute set. |
| */ |
| public static final AttributeSet EMPTY = new EmptyAttributeSet(); |
| |
| private transient Hashtable<Object, Object> table = new Hashtable<Object, Object>(3); |
| |
| /** |
| * Creates a new attribute set. |
| */ |
| public SimpleAttributeSet() { |
| } |
| |
| /** |
| * Creates a new attribute set based on a supplied set of attributes. |
| * |
| * @param source the set of attributes |
| */ |
| public SimpleAttributeSet(AttributeSet source) { |
| addAttributes(source); |
| } |
| |
| private SimpleAttributeSet(Hashtable<Object, Object> table) { |
| this.table = table; |
| } |
| |
| /** |
| * Checks whether the set of attributes is empty. |
| * |
| * @return true if the set is empty else false |
| */ |
| public boolean isEmpty() |
| { |
| return table.isEmpty(); |
| } |
| |
| /** |
| * Gets a count of the number of attributes. |
| * |
| * @return the count |
| */ |
| public int getAttributeCount() { |
| return table.size(); |
| } |
| |
| /** |
| * Tells whether a given attribute is defined. |
| * |
| * @param attrName the attribute name |
| * @return true if the attribute is defined |
| */ |
| public boolean isDefined(Object attrName) { |
| return table.containsKey(attrName); |
| } |
| |
| /** |
| * Compares two attribute sets. |
| * |
| * @param attr the second attribute set |
| * @return true if the sets are equal, false otherwise |
| */ |
| public boolean isEqual(AttributeSet attr) { |
| return ((getAttributeCount() == attr.getAttributeCount()) && |
| containsAttributes(attr)); |
| } |
| |
| /** |
| * Makes a copy of the attributes. |
| * |
| * @return the copy |
| */ |
| public AttributeSet copyAttributes() { |
| return (AttributeSet) clone(); |
| } |
| |
| /** |
| * Gets the names of the attributes in the set. |
| * |
| * @return the names as an <code>Enumeration</code> |
| */ |
| public Enumeration<?> getAttributeNames() { |
| return table.keys(); |
| } |
| |
| /** |
| * Gets the value of an attribute. |
| * |
| * @param name the attribute name |
| * @return the value |
| */ |
| public Object getAttribute(Object name) { |
| Object value = table.get(name); |
| if (value == null) { |
| AttributeSet parent = getResolveParent(); |
| if (parent != null) { |
| value = parent.getAttribute(name); |
| } |
| } |
| return value; |
| } |
| |
| /** |
| * Checks whether the attribute list contains a |
| * specified attribute name/value pair. |
| * |
| * @param name the name |
| * @param value the value |
| * @return true if the name/value pair is in the list |
| */ |
| public boolean containsAttribute(Object name, Object value) { |
| return value.equals(getAttribute(name)); |
| } |
| |
| /** |
| * Checks whether the attribute list contains all the |
| * specified name/value pairs. |
| * |
| * @param attributes the attribute list |
| * @return true if the list contains all the name/value pairs |
| */ |
| public boolean containsAttributes(AttributeSet attributes) { |
| boolean result = true; |
| |
| Enumeration names = attributes.getAttributeNames(); |
| while (result && names.hasMoreElements()) { |
| Object name = names.nextElement(); |
| result = attributes.getAttribute(name).equals(getAttribute(name)); |
| } |
| |
| return result; |
| } |
| |
| /** |
| * Adds an attribute to the list. |
| * |
| * @param name the attribute name |
| * @param value the attribute value |
| */ |
| public void addAttribute(Object name, Object value) { |
| table.put(name, value); |
| } |
| |
| /** |
| * Adds a set of attributes to the list. |
| * |
| * @param attributes the set of attributes to add |
| */ |
| public void addAttributes(AttributeSet attributes) { |
| Enumeration names = attributes.getAttributeNames(); |
| while (names.hasMoreElements()) { |
| Object name = names.nextElement(); |
| addAttribute(name, attributes.getAttribute(name)); |
| } |
| } |
| |
| /** |
| * Removes an attribute from the list. |
| * |
| * @param name the attribute name |
| */ |
| public void removeAttribute(Object name) { |
| table.remove(name); |
| } |
| |
| /** |
| * Removes a set of attributes from the list. |
| * |
| * @param names the set of names to remove |
| */ |
| public void removeAttributes(Enumeration<?> names) { |
| while (names.hasMoreElements()) |
| removeAttribute(names.nextElement()); |
| } |
| |
| /** |
| * Removes a set of attributes from the list. |
| * |
| * @param attributes the set of attributes to remove |
| */ |
| public void removeAttributes(AttributeSet attributes) { |
| if (attributes == this) { |
| table.clear(); |
| } |
| else { |
| Enumeration names = attributes.getAttributeNames(); |
| while (names.hasMoreElements()) { |
| Object name = names.nextElement(); |
| Object value = attributes.getAttribute(name); |
| if (value.equals(getAttribute(name))) |
| removeAttribute(name); |
| } |
| } |
| } |
| |
| /** |
| * Gets the resolving parent. This is the set |
| * of attributes to resolve through if an attribute |
| * isn't defined locally. This is null if there |
| * are no other sets of attributes to resolve |
| * through. |
| * |
| * @return the parent |
| */ |
| public AttributeSet getResolveParent() { |
| return (AttributeSet) table.get(StyleConstants.ResolveAttribute); |
| } |
| |
| /** |
| * Sets the resolving parent. |
| * |
| * @param parent the parent |
| */ |
| public void setResolveParent(AttributeSet parent) { |
| addAttribute(StyleConstants.ResolveAttribute, parent); |
| } |
| |
| // --- Object methods --------------------------------- |
| |
| /** |
| * Clones a set of attributes. |
| * |
| * @return the new set of attributes |
| */ |
| public Object clone() { |
| SimpleAttributeSet attr; |
| try { |
| attr = (SimpleAttributeSet) super.clone(); |
| attr.table = (Hashtable) table.clone(); |
| } catch (CloneNotSupportedException cnse) { |
| attr = null; |
| } |
| return attr; |
| } |
| |
| /** |
| * Returns a hashcode for this set of attributes. |
| * @return a hashcode value for this set of attributes. |
| */ |
| public int hashCode() { |
| return table.hashCode(); |
| } |
| |
| /** |
| * Compares this object to the specified object. |
| * The result is <code>true</code> if the object is an equivalent |
| * set of attributes. |
| * @param obj the object to compare this attribute set with |
| * @return <code>true</code> if the objects are equal; |
| * <code>false</code> otherwise |
| */ |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj instanceof AttributeSet) { |
| AttributeSet attrs = (AttributeSet) obj; |
| return isEqual(attrs); |
| } |
| return false; |
| } |
| |
| /** |
| * Converts the attribute set to a String. |
| * |
| * @return the string |
| */ |
| public String toString() { |
| String s = ""; |
| Enumeration names = getAttributeNames(); |
| while (names.hasMoreElements()) { |
| Object key = names.nextElement(); |
| Object value = getAttribute(key); |
| if (value instanceof AttributeSet) { |
| // don't go recursive |
| s = s + key + "=**AttributeSet** "; |
| } else { |
| s = s + key + "=" + value + " "; |
| } |
| } |
| return s; |
| } |
| |
| private void writeObject(java.io.ObjectOutputStream s) throws IOException { |
| s.defaultWriteObject(); |
| StyleContext.writeAttributeSet(s, this); |
| } |
| |
| private void readObject(ObjectInputStream s) |
| throws ClassNotFoundException, IOException { |
| s.defaultReadObject(); |
| table = new Hashtable<Object, Object>(3); |
| StyleContext.readAttributeSet(s, this); |
| } |
| |
| /** |
| * An AttributeSet that is always empty. |
| */ |
| static class EmptyAttributeSet implements AttributeSet, Serializable { |
| static final long serialVersionUID = -8714803568785904228L; |
| |
| public int getAttributeCount() { |
| return 0; |
| } |
| public boolean isDefined(Object attrName) { |
| return false; |
| } |
| public boolean isEqual(AttributeSet attr) { |
| return (attr.getAttributeCount() == 0); |
| } |
| public AttributeSet copyAttributes() { |
| return this; |
| } |
| public Object getAttribute(Object key) { |
| return null; |
| } |
| public Enumeration getAttributeNames() { |
| return Collections.emptyEnumeration(); |
| } |
| public boolean containsAttribute(Object name, Object value) { |
| return false; |
| } |
| public boolean containsAttributes(AttributeSet attributes) { |
| return (attributes.getAttributeCount() == 0); |
| } |
| public AttributeSet getResolveParent() { |
| return null; |
| } |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| return ((obj instanceof AttributeSet) && |
| (((AttributeSet)obj).getAttributeCount() == 0)); |
| } |
| public int hashCode() { |
| return 0; |
| } |
| } |
| } |