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+/* 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
+ * &lt;= 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);
+ }
+ }
+}