Makefile.am: Add new classes

	* Makefile.am: Add new classes
	(core_java_source_files): CharSequence
	(ordinary_java_source_files): Authenticator, PasswordAuthentication
	* Makefile.in: regenerate
	* gcj/javaprims.h: ditto
	* java/lang/CharSequence: new class from Classpath
	* java/lang/String.java: implements CharSequence
	(subSequence (int,int)): new method
	* java/lang/SubString.java: implements CharSequence
	(subSequence (int,int)): new method
	remerge comments with Classpath
	* java/net/Authenticator.java: new class from Classpath
	* java/net/PasswordAuthentication.java: ditto

From-SVN: r45969

3 files changed, 152 insertions, 17 deletions

diff --git a/libjava/java/lang/CharSequence.java b/libjava/java/lang/CharSequence.java
new file mode 100644
index 0000000..8ba677e
--- /dev/null
+++ b/libjava/java/lang/CharSequence.java
@@ -0,0 +1,80 @@
+/* java.lang.CharSequence -- Anything that has an indexed sequence of chars
+   Copyright (C) 2001 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., 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.lang;
+
+/**
+ * General functions on a sequence of chars. This interface is implemented
+ * by <code>String</code>, <code>StringBuffer</code> and
+ * <code>CharBuffer</code> to give a uniform way to get chars at a certain
+ * index, the number of characters in the sequence and a subrange of the
+ * chars. Indexes start at 0 and the last index is <code>length()-1</code>.
+ * <p>
+ * Even when classes implement this interface they are not always
+ * exchangeble because they might implement their compare, equals or hash
+ * function differently. This means that in general one should not use a
+ * <code>CharSequence</code> as keys in collections since two sequences
+ * with the same chars at the same indexes with the same length might not
+ * have the same hash code, be equal or be comparable since the are
+ * represented by different classes.
+ *
+ * @author Mark Wielaard (mark@klomp.org)
+ *
+ * @since 1.4
+ */
+
+public interface CharSequence {
+
+    /**
+     * Returns the character at the given index.
+     *
+     * @exception IndexOutOfBoundsException when <code>i &lt; 0</code> or
+     * <code>i &gt; length()-1</code>.
+     */
+    char charAt(int i);
+
+    /**
+     * Returns the length of the sequence.
+     */
+    int length();
+
+    /**
+     * Returns a new <code>CharSequence</char> of the indicated range.
+     *
+     * @exception IndexOutOfBoundsException when <code>begin &lt; 0</code>,
+     *         <code>end &lt; 0</code>, <code>end &gt; length()</code> or
+     *         <code>begin &gt; end</code>
+     */
+    CharSequence subSequence(int begin, int end);
+
+    /**
+     * Returns the complete <code>CharSequence</code> as a <code>String</code>.
+     * Classes that implement this interface should return a <code>String</code>
+     * which contains only the characters in the sequence in the correct order.
+     */
+    String toString();
+}
diff --git a/libjava/java/lang/String.java b/libjava/java/lang/String.java
index bed3171..8dadfb5 100644
--- a/libjava/java/lang/String.java
+++ b/libjava/java/lang/String.java
@@ -22,7 +22,7 @@ import java.util.Locale;
  * Status:  Complete to 1.3.
  */
 
-public final class String implements Serializable, Comparable
+public final class String implements Serializable, Comparable, CharSequence
 {
   private Object data;
   private int boffset; // Note this is a byte offset - don't use in Java code!
@@ -297,6 +297,28 @@ public final class String implements Serializable, Comparable
       }
   }
 
+  /**
+   * Creates a substring of this String, starting at a specified index
+   * and ending at one character before a specified index.
+   * <p>
+   * To implement <code>CharSequence</code>.
+   * Calls <code>substring(beginIndex, endIndex)</code>.
+   *
+   * @param beginIndex index to start substring (base 0)
+   * @param endIndex index after the last character to be 
+   *   copied into the substring
+   * 
+   * @return new String which is a substring of this String
+   *
+   * @exception StringIndexOutOfBoundsException 
+   *   if (beginIndex < 0 || endIndex > this.length() || beginIndex > endIndex)
+   */
+  public CharSequence subSequence(int beginIndex, int endIndex)
+    throws IndexOutOfBoundsException
+  {
+    return substring(beginIndex, endIndex);
+  }
+
   public String substring (int beginIndex)
   {
     return substring (beginIndex, count);
diff --git a/libjava/java/lang/StringBuffer.java b/libjava/java/lang/StringBuffer.java
index 211574a..38978b1 100644
--- a/libjava/java/lang/StringBuffer.java
+++ b/libjava/java/lang/StringBuffer.java
@@ -1,21 +1,32 @@
-// StringBuffer.java - Growable strings.
-
-/* Copyright (C) 1998, 1999, 2000  Free Software Foundation
-
-   This file is part of libgcj.
-
-This software is copyrighted work licensed under the terms of the
-Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
-details.  */
+/* StringBuffer.java -- Growable strings
+   Copyright (C) 1998, 1999, 2000, 2001 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., 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.lang;
 import java.io.Serializable;
 
-/**
- * @author Tom Tromey <tromey@cygnus.com>
- * @date October 23, 1998.  
- */
-
 /* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
  * Updated using online JDK 1.2 docs.
  * Believed complete and correct to JDK 1.2.
@@ -57,7 +68,7 @@ import java.io.Serializable;
  * @author Tom Tromey
  * @see java.lang.String
  */
-public final class StringBuffer implements Serializable
+public final class StringBuffer implements Serializable, CharSequence
 {
   /** Append the <code>String</code> value of the argument to this <code>StringBuffer</code>.
    *  Uses <code>String.valueOf()</code> to convert to
@@ -198,7 +209,7 @@ public final class StringBuffer implements Serializable
    *  @param index the index of the character to get, starting at 0.
    *  @return the character at the specified index.
    *  @exception IndexOutOfBoundsException if the desired character index
-   *             is not between 0 and length() - 1 (inclusive).
+   *             is negative or greater then length() - 1.
    */
   public synchronized char charAt (int index)
   {
@@ -653,6 +664,28 @@ public final class StringBuffer implements Serializable
     return new String (value, beginIndex, endIndex - beginIndex);
   }
 
+  /**
+   * Creates a substring of this StringBuffer, starting at a specified index
+   * and ending at one character before a specified index.
+   * <p>
+   * To implement <code>CharSequence</code>.
+   * Calls <code>substring(beginIndex, endIndex)</code>.
+   *
+   * @param beginIndex index to start substring (base 0)
+   * @param endIndex index after the last character to be 
+   *   copied into the substring
+   * 
+   * @return new String which is a substring of this StringBuffer
+   *
+   * @exception StringIndexOutOfBoundsException 
+   *   if (beginIndex < 0 || endIndex > this.length() || beginIndex > endIndex)
+   */
+  public CharSequence subSequence (int beginIndex, int endIndex) 
+  {
+    return substring(beginIndex, endIndex);
+  }
+
+
   /** Convert this <code>StringBuffer</code> to a <code>String</code>.
    *  @return the characters in this StringBuffer
    */