1 files changed, 62 insertions, 1 deletions

diff --git a/libjava/java/lang/StringBuilder.java b/libjava/java/lang/StringBuilder.java
index 5f33b2ed53a..55a49e6e15d 100644
--- a/libjava/java/lang/StringBuilder.java
+++ b/libjava/java/lang/StringBuilder.java
@@ -1,5 +1,5 @@
 /* StringBuilder.java -- Unsynchronized growable strings
-   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
+   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
    Free Software Foundation, Inc.
 
 This file is part of GNU Classpath.
@@ -998,4 +998,65 @@ public final class StringBuilder
    */
   // GCJ LOCAL: Native to access String internals properly.
   private native boolean regionMatches(int toffset, String other);
+
+  /**
+   * Get the code point at the specified index.  This is like #charAt(int),
+   * but if the character is the start of a surrogate pair, and the
+   * following character completes the pair, then the corresponding
+   * supplementary code point is returned.
+   * @param index the index of the codepoint to get, starting at 0
+   * @return the codepoint at the specified index
+   * @throws IndexOutOfBoundsException if index is negative or >= length()
+   * @since 1.5
+   */
+  public int codePointAt(int index)
+  {
+    return Character.codePointAt(value, index, count);
+  }
+
+    /**
+   * Get the code point before the specified index.  This is like
+   * #codePointAt(int), but checks the characters at <code>index-1</code> and
+   * <code>index-2</code> to see if they form a supplementary code point.
+   * @param index the index just past the codepoint to get, starting at 0
+   * @return the codepoint at the specified index
+   * @throws IndexOutOfBoundsException if index is negative or &gt;= length()
+   * @since 1.5
+   */
+  public int codePointBefore(int index)
+  {
+    // Character.codePointBefore() doesn't perform this check.  We
+    // could use the CharSequence overload, but this is just as easy.
+    if (index >= count)
+      throw new IndexOutOfBoundsException();
+    return Character.codePointBefore(value, index, 1);
+  }
+
+  /**
+   * Returns the number of Unicode code points in the specified sub sequence.
+   * Surrogate pairs count as one code point.
+   * @param beginIndex the start of the subarray
+   * @param endIndex the index after the last char in the subarray
+   * @return the number of code points
+   * @throws IndexOutOfBoundsException if beginIndex is less than zero or 
+   * greater than endIndex or if endIndex is greater than the length of this 
+   * StringBuilder
+   */
+  public int codePointCount(int beginIndex,int endIndex)
+  {
+    if (beginIndex < 0 || beginIndex > endIndex || endIndex > count)
+      throw new IndexOutOfBoundsException("invalid indices: " + beginIndex
+                                          + ", " + endIndex);
+    return Character.codePointCount(value, beginIndex, endIndex - beginIndex);
+  }
+
+  public void trimToSize()
+  {
+    if (count < value.length)
+      {
+        char[] newValue = new char[count];
+        System.arraycopy(value, 0, newValue, 0, count);
+        value = newValue;
+      }
+  }
 }