| /* CompressionMethodList.java -- A list of compression methods. |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is a part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or (at |
| your option) any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 |
| USA |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.javax.net.ssl.provider; |
| |
| import java.io.PrintWriter; |
| import java.io.StringWriter; |
| |
| import java.nio.ByteBuffer; |
| |
| import java.util.ConcurrentModificationException; |
| import java.util.ListIterator; |
| import java.util.NoSuchElementException; |
| |
| /** |
| * A basic list interface to a list of compression methods in an SSL |
| * packet. |
| */ |
| public final class CompressionMethodList implements Iterable<CompressionMethod> |
| { |
| private final ByteBuffer buffer; |
| private int modCount; |
| |
| public CompressionMethodList (final ByteBuffer buffer) |
| { |
| this.buffer = buffer; |
| modCount = 0; |
| } |
| |
| /** |
| * Return the number of elements in this list. |
| * |
| * @return The size of this list. |
| */ |
| public int size () |
| { |
| return (buffer.get (0) & 0xFF); |
| } |
| |
| /** |
| * Get the cipher suite at the specified index. |
| * |
| * @param index The index of the suite to get. |
| * @return The cipher suite at that index. |
| * @throws IndexOutOfBoundsException If the index is negative or is |
| * not less than {@link #size()}. |
| */ |
| public CompressionMethod get (final int index) |
| { |
| int size = size (); |
| if (index < 0 || index >= size) |
| throw new IndexOutOfBoundsException ("limit: " + size |
| + "; requested: " + index); |
| return CompressionMethod.getInstance (buffer.get (1 + index)); |
| } |
| |
| /** |
| * Set the CompressionMethod at the specified index. The list must |
| * have sufficient size to hold the element (that is, <code>index |
| * <= size ()</code>). |
| * |
| * @param index The index to put the suite. |
| * @param method The CompressionMethod object. |
| * @throws IndexOutOfBoundsException If <code>index</code> is not |
| * less than @{link #size()}, or if it is negative. |
| * @throws NullPointerException If <code>suite</code> is |
| * <code>null</code>. |
| * @throws java.nio.ReadOnlyBufferException If the underlying buffer |
| * is not writable. |
| */ |
| public void put (final int index, final CompressionMethod method) |
| { |
| int size = size (); |
| if (index < 0 || index >= size) |
| throw new IndexOutOfBoundsException ("limit: " + size |
| + "; requested: " + index); |
| buffer.position (1 + index); |
| buffer.put ((byte) method.getValue ()); |
| modCount++; |
| } |
| |
| /** |
| * Sets the size of this list. You must call this if you are adding |
| * elements to the list; calling {@link |
| * #put(int,gnu.jessie.provider.CipherSuite)} does not expand the |
| * list size (the same goes for removing elements, as there is no |
| * <code>remove</code> method). |
| * |
| * @param newSize The new size of this list. |
| * @throws IllegalArgumentException If the new size is negative or |
| * greater than 32767, or if there is insufficient space for that |
| * many elements in the underlying buffer. |
| * @throws java.nio.ReadOnlyBufferException If the underlying buffer |
| * is not writable. |
| */ |
| public void setSize (final int newSize) |
| { |
| if (newSize < 0 || newSize > 255) |
| throw new IllegalArgumentException ("size must be between 0 and 255"); |
| if (newSize + 1 > buffer.capacity ()) |
| throw new IllegalArgumentException ("limit: " + buffer.capacity () |
| + "; requested: " + newSize); |
| buffer.put (0, (byte) newSize); |
| modCount++; |
| } |
| |
| public String toString () |
| { |
| return toString (null); |
| } |
| |
| public String toString (final String prefix) |
| { |
| StringWriter str = new StringWriter (); |
| PrintWriter out = new PrintWriter (str); |
| if (prefix != null) |
| out.print (prefix); |
| out.print ("["); |
| out.print (size ()); |
| out.println ("] {"); |
| for (Iterator it = new Iterator (); it.hasNext (); ) |
| { |
| CompressionMethod method = (CompressionMethod) it.next (); |
| if (prefix != null) |
| out.print (prefix); |
| out.print (" "); |
| out.print (method); |
| if (it.hasNext ()) |
| out.print (","); |
| out.println (); |
| } |
| if (prefix != null) |
| out.print (prefix); |
| out.print ("};"); |
| return str.toString (); |
| } |
| |
| public boolean equals (Object o) |
| { |
| if (!(o instanceof CompressionMethodList)) |
| return false; |
| CompressionMethodList that = (CompressionMethodList) o; |
| |
| if (size () != that.size ()) |
| return false; |
| |
| for (Iterator it1 = new Iterator (), it2 = that.new Iterator (); |
| it1.hasNext () && it2.hasNext (); ) |
| { |
| if (!it1.next ().equals (it2.next ())) |
| return false; |
| } |
| return true; |
| } |
| |
| public java.util.Iterator<CompressionMethod> iterator () |
| { |
| return new Iterator (); |
| } |
| |
| /** |
| * An iterator for the elements in this list. The iterator supports |
| * only the <code>set</code> method out of the optional methods, |
| * because elements in a CipherSuiteList may not be removed or |
| * added; only the size of the list can be changed, and elements at |
| * a specific index changed. |
| */ |
| public class Iterator implements ListIterator<CompressionMethod> |
| { |
| private int index; |
| private final int modCount; |
| |
| Iterator () |
| { |
| index = 0; |
| modCount = CompressionMethodList.this.modCount; |
| } |
| |
| public void add (CompressionMethod cm) |
| { |
| throw new UnsupportedOperationException (); |
| } |
| |
| public boolean hasNext () |
| { |
| return (index < size ()); |
| } |
| |
| public boolean hasPrevious () |
| { |
| return (index > 0); |
| } |
| |
| public CompressionMethod next () throws NoSuchElementException |
| { |
| if (modCount != CompressionMethodList.this.modCount) |
| throw new ConcurrentModificationException (); |
| try |
| { |
| return get (index++); |
| } |
| catch (IndexOutOfBoundsException ioobe) |
| { |
| throw new NoSuchElementException (); |
| } |
| } |
| |
| public int nextIndex () |
| { |
| if (hasNext ()) |
| return (index + 1); |
| return -1; |
| } |
| |
| public CompressionMethod previous () throws NoSuchElementException |
| { |
| if (index == 0) |
| throw new NoSuchElementException (); |
| if (modCount != CompressionMethodList.this.modCount) |
| throw new ConcurrentModificationException (); |
| try |
| { |
| return get (--index); |
| } |
| catch (IndexOutOfBoundsException ioobe) // on empty list |
| { |
| throw new NoSuchElementException (); |
| } |
| } |
| |
| public int previousIndex () |
| { |
| return (index - 1); |
| } |
| |
| public void remove () |
| { |
| throw new UnsupportedOperationException (); |
| } |
| |
| public void set (final CompressionMethod cm) |
| { |
| put (index, cm); |
| } |
| } |
| } |