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imported gcc-4.6.4 source tree from verified upstream tarball.

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1 files changed, 532 insertions, 0 deletions

diff --git a/libjava/classpath/java/nio/CharBuffer.java b/libjava/classpath/java/nio/CharBuffer.java
new file mode 100644
index 000000000..a1729e6e7
--- /dev/null
+++ b/libjava/classpath/java/nio/CharBuffer.java
@@ -0,0 +1,532 @@
+/* CharBuffer.java --
+   Copyright (C) 2002, 2003, 2004, 2005  Free Software Foundation, Inc.
+
+This file is 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, 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; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, 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 java.nio;
+
+// GCJ LOCAL: Use RawData instead of gnu.classpath.Pointer
+import gnu.gcj.RawData;
+
+import java.io.IOException;
+
+/**
+ * @since 1.4
+ */
+public abstract class CharBuffer extends Buffer
+  implements Comparable<CharBuffer>, CharSequence, Readable, Appendable
+{
+  final int array_offset;
+  final char[] backing_buffer;
+
+  CharBuffer (int capacity, int limit, int position, int mark,
+              RawData address, char[] backing_buffer, int array_offset)
+  {
+    super (capacity, limit, position, mark, address);
+    this.backing_buffer = backing_buffer;
+    this.array_offset = array_offset;
+  }
+
+  /**
+   * Allocates a new <code>CharBuffer</code> object with a given capacity.
+   */
+  public static CharBuffer allocate (int capacity)
+  {
+    return new CharBufferImpl (capacity);
+  }
+
+  /**
+   * Wraps a <code>char</code> array into a <code>CharBuffer</code>
+   * object.
+   *
+   * @param array the array to wrap
+   * @param offset the offset of the region in the array to wrap
+   * @param length the length of the region in the array to wrap
+   *
+   * @return a new <code>CharBuffer</code> object
+   *
+   * @exception IndexOutOfBoundsException If the preconditions on the offset
+   * and length parameters do not hold
+   */
+  public static final CharBuffer wrap(char[] array, int offset, int length)
+  {
+    return new CharBufferImpl(array, 0, array.length, offset + length, offset,
+                              -1, false);
+  }
+
+  /**
+   * Wraps a character sequence into a <code>CharBuffer</code> object.
+   *
+   * @param seq the sequence to wrap
+   *
+   * @return a new <code>CharBuffer</code> object
+   */
+  public static final CharBuffer wrap(CharSequence seq)
+  {
+    return wrap(seq, 0, seq.length());
+  }
+
+  /**
+   * Wraps a character sequence into a <code>CharBuffer</code> object.
+   *
+   * @param seq the sequence to wrap
+   * @param start the index of the first character to wrap
+   * @param end the index of the first character not to wrap
+   *
+   * @return a new <code>CharBuffer</code> object
+   *
+   * @exception IndexOutOfBoundsException If the preconditions on the offset
+   * and length parameters do not hold
+   */
+  public static final CharBuffer wrap(CharSequence seq, int start, int end)
+  {
+    return new CharSequenceBuffer(seq, start, end);
+  }
+
+  /**
+   * Wraps a <code>char</code> array into a <code>CharBuffer</code>
+   * object.
+   *
+   * @param array the array to wrap
+   *
+   * @return a new <code>CharBuffer</code> object
+   */
+  public static final CharBuffer wrap(char[] array)
+  {
+    return wrap(array, 0, array.length);
+  }
+
+  /**
+   * This method transfers <code>char</code>s from this buffer into the given
+   * destination array. Before the transfer, it checks if there are fewer than
+   * length <code>char</code>s remaining in this buffer.
+   *
+   * @param dst The destination array
+   * @param offset The offset within the array of the first <code>char</code>
+   * to be written; must be non-negative and no larger than dst.length.
+   * @param length The maximum number of bytes to be written to the given array;
+   * must be non-negative and no larger than dst.length - offset.
+   *
+   * @exception BufferUnderflowException If there are fewer than length
+   * <code>char</code>s remaining in this buffer.
+   * @exception IndexOutOfBoundsException If the preconditions on the offset
+   * and length parameters do not hold.
+   */
+  public CharBuffer get (char[] dst, int offset, int length)
+  {
+    checkArraySize(dst.length, offset, length);
+    checkForUnderflow(length);
+
+    for (int i = offset; i < offset + length; i++)
+      {
+        dst [i] = get ();
+      }
+
+    return this;
+  }
+
+  /** @since 1.5 */
+  public int read(CharBuffer buffer) throws IOException
+  {
+    // We want to call put(), so we don't manipulate the CharBuffer
+    // directly.
+    int rem = Math.min(buffer.remaining(), remaining());
+    char[] buf = new char[rem];
+    get(buf);
+    buffer.put(buf);
+    return rem;
+  }
+
+  /**
+   * This method transfers <code>char</code>s from this buffer into the given
+   * destination array.
+   *
+   * @param dst The byte array to write into.
+   *
+   * @exception BufferUnderflowException If there are fewer than dst.length
+   * <code>char</code>s remaining in this buffer.
+   */
+  public CharBuffer get (char[] dst)
+  {
+    return get (dst, 0, dst.length);
+  }
+
+  /**
+   * Writes the content of the the <code>CharBUFFER</code> src
+   * into the buffer. Before the transfer, it checks if there is fewer than
+   * <code>src.remaining()</code> space remaining in this buffer.
+   *
+   * @param src The source data.
+   *
+   * @exception BufferOverflowException If there is insufficient space in this
+   * buffer for the remaining <code>char</code>s in the source buffer.
+   * @exception IllegalArgumentException If the source buffer is this buffer.
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   */
+  public CharBuffer put (CharBuffer src)
+  {
+    if (src == this)
+      throw new IllegalArgumentException ();
+
+    checkForOverflow(src.remaining());
+
+    if (src.remaining () > 0)
+      {
+        char[] toPut = new char [src.remaining ()];
+        src.get (toPut);
+        put (toPut);
+      }
+
+    return this;
+  }
+
+  /**
+   * Writes the content of the the <code>char array</code> src
+   * into the buffer. Before the transfer, it checks if there is fewer than
+   * length space remaining in this buffer.
+   *
+   * @param src The array to copy into the buffer.
+   * @param offset The offset within the array of the first byte to be read;
+   * must be non-negative and no larger than src.length.
+   * @param length The number of bytes to be read from the given array;
+   * must be non-negative and no larger than src.length - offset.
+   *
+   * @exception BufferOverflowException If there is insufficient space in this
+   * buffer for the remaining <code>char</code>s in the source array.
+   * @exception IndexOutOfBoundsException If the preconditions on the offset
+   * and length parameters do not hold
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   */
+  public CharBuffer put (char[] src, int offset, int length)
+  {
+    checkArraySize(src.length, offset, length);
+    checkForOverflow(length);
+
+    for (int i = offset; i < offset + length; i++)
+      put (src [i]);
+
+    return this;
+  }
+
+  /**
+   * Writes the content of the the <code>char array</code> src
+   * into the buffer.
+   *
+   * @param src The array to copy into the buffer.
+   *
+   * @exception BufferOverflowException If there is insufficient space in this
+   * buffer for the remaining <code>char</code>s in the source array.
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   */
+  public final CharBuffer put (char[] src)
+  {
+    return put (src, 0, src.length);
+  }
+
+  /**
+   * Tells whether ot not this buffer is backed by an accessible
+   * <code>char</code> array.
+   */
+  public final boolean hasArray ()
+  {
+    return (backing_buffer != null
+            && !isReadOnly ());
+  }
+
+  /**
+   * Returns the <code>char</code> array that backs this buffer.
+   *
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   * @exception UnsupportedOperationException If this buffer is not backed
+   * by an accessible array.
+   */
+  public final char[] array ()
+  {
+    if (backing_buffer == null)
+      throw new UnsupportedOperationException ();
+
+    checkIfReadOnly();
+
+    return backing_buffer;
+  }
+
+  /**
+   * Returns the offset within this buffer's backing array of the first element.
+   *
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   * @exception UnsupportedOperationException If this buffer is not backed
+   * by an accessible array.
+   */
+  public final int arrayOffset ()
+  {
+    if (backing_buffer == null)
+      throw new UnsupportedOperationException ();
+
+    checkIfReadOnly();
+
+    return array_offset;
+  }
+
+  /**
+   * Calculates a hash code for this buffer.
+   *
+   * This is done with int arithmetic,
+   * where ** represents exponentiation, by this formula:<br>
+   * <code>s[position()] + 31 + (s[position()+1] + 30)*31**1 + ... +
+   * (s[limit()-1]+30)*31**(limit()-1)</code>.
+   * Where s is the buffer data. Note that the hashcode is dependent
+   * on buffer content, and therefore is not useful if the buffer
+   * content may change.
+   */
+  public int hashCode ()
+  {
+    int hashCode = get(position()) + 31;
+    int multiplier = 1;
+    for (int i = position() + 1; i < limit(); ++i)
+      {
+          multiplier *= 31;
+          hashCode += (get(i) + 30)*multiplier;
+      }
+    return hashCode;
+  }
+
+  /**
+   * Checks if this buffer is equal to obj.
+   */
+  public boolean equals (Object obj)
+  {
+    if (obj instanceof CharBuffer)
+      {
+        return compareTo ((CharBuffer) obj) == 0;
+      }
+
+    return false;
+  }
+
+  /**
+   * Compares two <code>CharBuffer</code> objects.
+   *
+   * @exception ClassCastException If obj is not an object derived from
+   * <code>CharBuffer</code>.
+   */
+  public int compareTo (CharBuffer other)
+  {
+    int num = Math.min(remaining(), other.remaining());
+    int pos_this = position();
+    int pos_other = other.position();
+
+    for (int count = 0; count < num; count++)
+      {
+         char a = get(pos_this++);
+         char b = other.get(pos_other++);
+
+         if (a == b)
+           continue;
+
+         if (a < b)
+           return -1;
+
+         return 1;
+      }
+
+     return remaining() - other.remaining();
+  }
+
+  /**
+   * Returns the byte order of this buffer.
+   */
+  public abstract ByteOrder order ();
+
+  /**
+   * Reads the <code>char</code> at this buffer's current position,
+   * and then increments the position.
+   *
+   * @exception BufferUnderflowException If there are no remaining
+   * <code>char</code>s in this buffer.
+   */
+  public abstract char get ();
+
+  /**
+   * Writes the <code>char</code> at this buffer's current position,
+   * and then increments the position.
+   *
+   * @exception BufferOverflowException If there no remaining
+   * <code>char</code>s in this buffer.
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   */
+  public abstract CharBuffer put (char b);
+
+  /**
+   * Absolute get method.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit.
+   */
+  public abstract char get (int index);
+
+  /**
+   * Absolute put method.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit.
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   */
+  public abstract CharBuffer put (int index, char b);
+
+  /**
+   * Compacts this buffer.
+   *
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   */
+  public abstract CharBuffer compact ();
+
+  /**
+   * Tells wether or not this buffer is direct.
+   */
+  public abstract boolean isDirect ();
+
+  /**
+   * Creates a new <code>CharBuffer</code> whose content is a shared
+   * subsequence of this buffer's content.
+   */
+  public abstract CharBuffer slice ();
+
+  /**
+   * Creates a new <code>CharBuffer</code> that shares this buffer's
+   * content.
+   */
+  public abstract CharBuffer duplicate ();
+
+  /**
+   * Creates a new read-only <code>CharBuffer</code> that shares this
+   * buffer's content.
+   */
+  public abstract CharBuffer asReadOnlyBuffer ();
+
+  /**
+   * Returns the remaining content of the buffer as a string.
+   */
+  public String toString ()
+  {
+    if (hasArray ())
+      return new String (array (), position (), length ());
+
+    char[] buf = new char [length ()];
+    int pos = position ();
+    get (buf, 0, buf.length);
+    position (pos);
+    return new String (buf);
+  }
+
+  /**
+   * Returns the length of the remaining chars in this buffer.
+   */
+  public final int length ()
+  {
+    return remaining ();
+  }
+
+  /**
+   * Creates a new character buffer that represents the specified subsequence
+   * of this buffer, relative to the current position.
+   *
+   * @exception IndexOutOfBoundsException If the preconditions on start and
+   * end do not hold.
+   */
+  public abstract CharSequence subSequence (int start, int length);
+
+  /**
+   * Relative put method.
+   *
+   * @exception BufferOverflowException If there is insufficient space in this
+   * buffer.
+   * @exception IndexOutOfBoundsException If the preconditions on the start
+   * and end parameters do not hold.
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   */
+  public CharBuffer put (String str, int start, int length)
+  {
+    return put (str.toCharArray (), start, length);
+  }
+
+  /**
+   * Relative put method.
+   *
+   * @exception BufferOverflowException If there is insufficient space in this
+   * buffer.
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   */
+  public final CharBuffer put (String str)
+  {
+    return put (str.toCharArray (), 0, str.length ());
+  }
+
+  /**
+   * Returns the character at <code>position() + index</code>.
+   *
+   * @exception IndexOutOfBoundsException If index is negative not smaller than
+   * <code>remaining()</code>.
+   */
+  public final char charAt (int index)
+  {
+    if (index < 0
+        || index >= remaining ())
+      throw new IndexOutOfBoundsException ();
+
+    return get (position () + index);
+  }
+
+  /** @since 1.5 */
+  public CharBuffer append(char c)
+  {
+    put(c);
+    return this;
+  }
+
+  /** @since 1.5 */
+  public CharBuffer append(CharSequence cs)
+  {
+    put(cs == null ? "null" : cs.toString());
+    return this;
+  }
+
+  /** @since 1.5 */
+  public CharBuffer append(CharSequence cs, int start, int end)
+  {
+    put(cs == null ? "null" : cs.subSequence(start, end).toString());
+    return this;
+  }
+}