SequenceInputStream.java: Merge with Classpath

	* java/io/SequenceInputStream.java: Merge with Classpath
	* java/io/StringBufferInputStream.java: Ditto
	* java/util/Collections.java: Remerge with Classpath

From-SVN: r46005

4 files changed, 239 insertions, 32 deletions

diff --git a/libjava/ChangeLog b/libjava/ChangeLog
index 450e0c8..b2767d0 100644
--- a/libjava/ChangeLog
+++ b/libjava/ChangeLog
@@ -1,3 +1,9 @@
+2001-10-03  Mark Wielaard  <mark@klomp.org>
+
+	* java/io/SequenceInputStream.java: Merge with Classpath
+	* java/io/StringBufferInputStream.java: Ditto
+	* java/util/Collections.java: Remerge with Classpath
+
 2001-10-03  Tom Tromey  <tromey@redhat.com>
 
 	* java/lang/ref/natReference.cc (add_to_hash): Set n->next before
diff --git a/libjava/java/io/SequenceInputStream.java b/libjava/java/io/SequenceInputStream.java
index 0545277..f125953 100644
--- a/libjava/java/io/SequenceInputStream.java
+++ b/libjava/java/io/SequenceInputStream.java
@@ -1,36 +1,76 @@
-/* Copyright (C) 1998, 1999  Free Software Foundation
+/* SequenceInputStream.java -- Reads multiple input streams in sequence
+   Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc.
 
-   This file is part of libgcj.
+This file is part of GNU Classpath.
 
-This software is copyrighted work licensed under the terms of the
-Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
-details.  */
+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., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+As a special exception, if you link this library with other files to
+produce an executable, this library does not by itself cause the
+resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why the
+executable file might be covered by the GNU General Public License. */
+
+
 package java.io;
 
 import java.util.Enumeration;
 
-/**
- * @author Warren Levy <warrenl@cygnus.com>
- * @date November 3, 1998.  
- */
 /* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
  * "The Java Language Specification", ISBN 0-201-63451-1
  * plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
  * Status:  Believed complete and correct.
  */
  
+/**
+  * This class merges a sequence of multiple <code>InputStream</code>'s in
+  * order to form a single logical stream that can be read by applications
+  * that expect only one stream.
+  * <p>
+  * The streams passed to the constructor method are read in order until
+  * they return -1 to indicate they are at end of stream.  When a stream
+  * reports end of stream, it is closed, then the next stream is read.
+  * When the last stream is closed, the next attempt to read from this
+  * stream will return a -1 to indicate it is at end of stream.
+  * <p>
+  * If this stream is closed prior to all subordinate streams being read
+  * to completion, all subordinate streams are closed.
+  *
+  * @author Aaron M. Renn (arenn@urbanophile.com)
+  * @author Warren Levy <warrenl@cygnus.com>
+  */
 public class SequenceInputStream extends InputStream
 {
-  /* The handle for the current input stream. */
+  /** The handle for the current input stream. */
   private InputStream in;
 
-  /* Secondary input stream; not used if constructed w/ enumeration. */
+  /** Secondary input stream; not used if constructed w/ enumeration. */
   private InputStream in2;
 
-  /* The enum handle; not used if constructed w/ 2 explicit input streams. */
+  /** The enum handle; not used if constructed w/ 2 explicit input streams. */
   private Enumeration enum;
 
+ /**
+  * This method creates a new <code>SequenceInputStream</code> that obtains
+  * its list of subordinate <code>InputStream</code>s from the specified
+  * <code>Enumeration</code>
+  *
+  * @param e An <code>Enumeration</code> that will return a list of
+  * <code>InputStream</code>s to read in sequence
+  */
   public SequenceInputStream(Enumeration e)
   {
     enum = e;
@@ -38,12 +78,30 @@ public class SequenceInputStream extends InputStream
     in2 = null;
   }
 
+ /**
+  * This method creates a new <code>SequenceInputStream</code> that will read
+  * the two specified subordinate <code>InputStream</code>s in sequence.
+  *
+  * @param s1 The first <code>InputStream</code> to read
+  * @param s2 The second <code>InputStream</code> to read
+  */
   public SequenceInputStream(InputStream s1, InputStream s2)
   {
     in = s1;
     in2 = s2;
   }
 
+ /**
+  * This method returns the number of bytes than can be read from the
+  * currently being read subordinate stream before that stream could
+  * block.  Note that it is possible more bytes than this can actually
+  * be read without the stream blocking.  If a 0 is returned, then the
+  * stream could block on the very next read.
+  *
+  * @return The number of bytes that can be read before blocking could occur
+  *
+  * @exception IOException If an error occurs
+  */
   public int available() throws IOException
   {
     if (in == null)
@@ -52,6 +110,13 @@ public class SequenceInputStream extends InputStream
     return in.available();
   }
 
+ /**
+  * Closes this stream.  This will cause any remaining unclosed subordinate
+  * <code>InputStream</code>'s to be closed as well.  Subsequent attempts to 
+  * read from this stream may cause an exception.
+  *
+  * @exception IOException If an error occurs
+  */
   public void close() throws IOException
   {
     while (in != null)
@@ -61,6 +126,18 @@ public class SequenceInputStream extends InputStream
       }
   }
 
+ /**
+  * This method reads an unsigned byte from the input stream and returns it
+  * as an int in the range of 0-255.  This method also will return -1 if
+  * the end of the stream has been reached.  This will only happen when
+  * all of the subordinate streams have been read.
+  * <p>
+  * This method will block until the byte can be read.
+  *
+  * @return The byte read, or -1 if end of stream
+  *
+  * @exception IOException If an error occurs
+  */
   public int read() throws IOException
   {
     int ch = -1;
@@ -74,6 +151,25 @@ public class SequenceInputStream extends InputStream
     return ch;
   }
 
+ /**
+  * This method reads bytes from a stream and stores them into a caller
+  * supplied buffer.  It starts storing the data at index <code>offset</code>
+  * into the buffer and attempts to read <code>len</code> bytes. This method
+  * can return before reading the number of bytes requested. The actual number
+  * of bytes read is returned as an int. A -1 is returend to indicate the
+  * end of the stream. This will only happen when all of the subordinate
+  * streams have been read.
+  * <p>
+  * This method will block until at least one byte can be read.
+  *
+  * @param b The array into which bytes read should be stored
+  * @param off The offset into the array to start storing bytes
+  * @param len The requested number of bytes to read
+  *
+  * @return The actual number of bytes read, or -1 if end of stream
+  *
+  * @exception IOException If an error occurs
+  */
   public int read(byte[] b, int off, int len) throws IOException
   {
     int ch = -1;
@@ -89,6 +185,10 @@ public class SequenceInputStream extends InputStream
     return ch;
   }
 
+ /**
+  * This private method is used to get the next <code>InputStream</code> to
+  * read from. Returns null when no more streams are available.
+  */
   private InputStream getNextStream()
   {
     InputStream nextIn = null;
diff --git a/libjava/java/io/StringBufferInputStream.java b/libjava/java/io/StringBufferInputStream.java
index 063e19d3..40ef73c 100644
--- a/libjava/java/io/StringBufferInputStream.java
+++ b/libjava/java/io/StringBufferInputStream.java
@@ -1,46 +1,106 @@
-/* Copyright (C) 1998, 1999  Free Software Foundation
+/* StringBufferInputStream.java -- Read an String as a stream
+   Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc.
 
-   This file is part of libgcj.
+This file is part of GNU Classpath.
 
-This software is copyrighted work licensed under the terms of the
-Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
-details.  */
+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., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+As a special exception, if you link this library with other files to
+produce an executable, this library does not by itself cause the
+resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why the
+executable file might be covered by the GNU General Public License. */
+
+
 package java.io;
 
-/**
- * @author Warren Levy <warrenl@cygnus.com>
- * @date November 11, 1998.
- * @deprecated 
- */
 /* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
  * "The Java Language Specification", ISBN 0-201-63451-1
  * plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
  * Status:  Believed complete and correct.  Deprecated in JDK 1.1.
  */
  
+/**
+  * This class permits a <code>String</code> to be read as an input stream.
+  * The low eight bits of each character in the <code>String</code> are the
+  * bytes that are returned. The high eight bits of each character are
+  * discarded.
+  * <p>
+  * The mark/reset functionality in this class behaves differently than
+  * normal.  The <code>mark()</code> method is always ignored and the 
+  * <code>reset()</code> method always resets in stream to start reading from 
+  * position 0 in the String.  Note that since this method does not override 
+  * <code>markSupported()</code> in <code>InputStream</code>, calling that 
+  * method will return <code>false</code>.
+  * <p>
+  * Note that this class is deprecated because it does not properly handle
+  * 16-bit Java characters.  It is provided for backwards compatibility only
+  * and should not be used for new development.  The <code>StringReader</code>
+  * class should be used instead.
+  *
+  * @deprecated
+  *
+  * @author Aaron M. Renn (arenn@urbanophile.com)
+  * @author Warren Levy <warrenl@cygnus.com>
+  */
 public class StringBufferInputStream extends InputStream
 {
-  /* The String which is the input to this stream. */
+  /** The String which is the input to this stream. */
   protected String buffer;
 
-  /* Position of the next byte in buffer to be read. */
+  /** Position of the next byte in buffer to be read. */
   protected int pos = 0;
 
-  /* The length of the String buffer. */
+  /** The length of the String buffer. */
   protected int count;
 
+ /**
+  * Create a new <code>StringBufferInputStream</code> that will read bytes
+  * from the passed in <code>String</code>.  This stream will read from the
+  * beginning to the end of the <code>String</code>.
+  *
+  * @param s The <code>String</code> this stream will read from.
+  */
   public StringBufferInputStream(String s)
   {
     buffer = s;
     count = s.length();
   }
 
+ /**
+  * This method returns the number of bytes available to be read from this
+  * stream.  The value returned will be equal to <code>count - pos</code>.
+  *
+  * @return The number of bytes that can be read from this stream before
+  * blocking, which is all of them
+  */
   public int available()
   {
     return count - pos;
   }
 
+ /**
+  * This method reads one byte from the stream.  The <code>pos</code> counter 
+  * is advanced to the next byte to be read.  The byte read is returned as
+  * an int in the range of 0-255.  If the stream position is already at the
+  * end of the buffer, no byte is read and a -1 is returned in order to
+  * indicate the end of the stream.
+  *
+  * @return The byte read, or -1 if end of stream
+  */
   public int read()
   {
     if (pos >= count)
@@ -49,6 +109,23 @@ public class StringBufferInputStream extends InputStream
     return ((int) buffer.charAt(pos++)) & 0xFF;
   }
 
+/**
+  * This method reads bytes from the stream and stores them into a caller
+  * supplied buffer.  It starts storing the data at index <code>offset</code> 
+  * into the buffer and attempts to read <code>len</code> bytes.  This method
+  * can return before reading the number of bytes requested if the end of the
+  * stream is encountered first.  The actual number of bytes read is 
+  * returned.  If no bytes can be read because the stream is already at 
+  * the end of stream position, a -1 is returned.
+  * <p>
+  * This method does not block.
+  *
+  * @param b The array into which the bytes read should be stored.
+  * @param off The offset into the array to start storing bytes
+  * @param len The requested number of bytes to read
+  *
+  * @return The actual number of bytes read, or -1 if end of stream.
+  */
   public int read(byte[] b, int off, int len)
   {
     if (off < 0 || len < 0 || off + len > b.length)
@@ -66,11 +143,27 @@ public class StringBufferInputStream extends InputStream
     return numRead;
   }
 
+ /**
+  * This method sets the read position in the stream to the beginning
+  * setting the <code>pos</code> variable equal to 0.  Note that this differs
+  * from the common implementation of the <code>reset()</code> method.
+  */
   public void reset()
   {
     pos = 0;
   }
 
+ /**
+  * This method attempts to skip the requested number of bytes in the
+  * input stream.  It does this by advancing the <code>pos</code> value by the
+  * specified number of bytes.  It this would exceed the length of the
+  * buffer, then only enough bytes are skipped to position the stream at
+  * the end of the buffer.  The actual number of bytes skipped is returned.
+  *
+  * @param n The requested number of bytes to skip
+  *
+  * @return The actual number of bytes skipped.
+  */
   public long skip(long n)
   {
     if (n < 0)
diff --git a/libjava/java/util/Collections.java b/libjava/java/util/Collections.java
index 74efdec..3e2a40e5 100644
--- a/libjava/java/util/Collections.java
+++ b/libjava/java/util/Collections.java
@@ -1,5 +1,5 @@
 /* Collections.java -- Utility class with methods to operate on collections
-   Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
 
 This file is part of GNU Classpath.
 
@@ -595,7 +595,7 @@ public class Collections
    * of this method is Serializable.
    *
    * @param o the single element.
-   * @returns an immutable Set containing only o.
+   * @return an immutable Set containing only o.
    */
   // It's not serializable because the spec is broken.
   public static Set singleton(final Object o)
@@ -645,7 +645,7 @@ public class Collections
    * of this method is Serializable.
    *
    * @param o the single element.
-   * @returns an immutable List containing only o.
+   * @return an immutable List containing only o.
    */
   // It's not serializable because the spec is broken.
   public static List singletonList(final Object o)
@@ -677,7 +677,7 @@ public class Collections
    *
    * @param key the single key.
    * @param value the single value.
-   * @returns an immutable Map containing only the single key value pair.
+   * @return an immutable Map containing only the single key value pair.
    */
   // It's not serializable because the spec is broken.
   public static Map singletonMap(final Object key, final Object value)
@@ -686,7 +686,7 @@ public class Collections
     {
       public Set entrySet()
       {
-	return singleton(new HashMap.Entry(key, value));
+	return singleton(new BasicMapEntry(key, value));
       }
     };
   }
@@ -1294,7 +1294,11 @@ public class Collections
     }
   }
 
-  private static class SynchronizedCollection implements Collection,
+  /**
+   * Package visible, so that collections such as the one for
+   * Hashtable.values() can specify which object to synchronize on.
+   */
+  static class SynchronizedCollection implements Collection,
     Serializable
   {
     Object sync;
@@ -1522,7 +1526,11 @@ public class Collections
     }
   }
 
-  private static class SynchronizedSet extends SynchronizedCollection
+  /**
+   * Package visible, so that sets such as the one for Hashtable.keySet()
+   * can specify which object to synchronize on.
+   */
+  static class SynchronizedSet extends SynchronizedCollection
     implements Set
   {
     public SynchronizedSet(Object sync, Set s)