>ant/core/trunk/src/main/org/apache/tools/ant/util/StringUtils.java
(original)
>+++ ant/core/trunk/src/main/org/apache/tools/ant/util/StringUtils.java
>+++ Sat Oct 22 10:27:25 2005
>
>+ /**
>+ * Checks that a string buffer ends up with a given string. It may
sound trivial with the existing
>+ * JDK API but the various implementation among JDKs can make
those methods extremely resource intensive
>+ * and perform poorly due to massive memory allocation and
copying. See
See where?
Jan
>+ * @param buffer the buffer to perform the check on
>+ * @param suffix the suffix
>+ * @return <code>true</code> if the character sequence
represented by the
>+ * argument is a suffix of the character sequence
represented by
>+ * the StringBuffer object; <code>false</code> otherwise.
Note that the
>+ * result will be <code>true</code> if the argument is
the
>+ * empty string.
>+ */
>+ public static boolean endsWith(StringBuffer buffer, String suffix)
{
>+ if (suffix.length() > buffer.length()) {
>+ return false;
>+ }
>+ // this loop is done on purpose to avoid memory allocation
performance problems on various JDKs
>+ // StringBuffer.lastIndexOf() was introduced in jdk 1.4 and
implementation is ok though does allocation/copying
>+ // StringBuffer.toString().endsWith() does massive memory
allocation/copying on JDK 1.5
>+ // See http://issues.apache.org/bugzilla/show_bug.cgi?id=37169
>+ int endIndex = suffix.length() - 1;
>+ int bufferIndex = buffer.length() - 1;
>+ while ( endIndex >= 0 ) {
>+ if ( buffer.charAt(bufferIndex) != suffix.charAt(endIndex)
) {
>+ return false;
>+ }
>+ bufferIndex--;
>+ endIndex--;
>+ }
>+ return true;
>+ }
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