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diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/selectors/DifferentSelector.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/selectors/DifferentSelector.java
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+++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/selectors/DifferentSelector.java
@@ -0,0 +1,114 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You under the Apache License, Version 2.0
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ */
+
+package org.apache.tools.ant.types.selectors;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.util.FileUtils;
+
+/**
+ * This selector selects files against a mapped set of target files, selecting
+ * all those files which are different.
+ * Files with different lengths are deemed different
+ * automatically
+ * Files with identical timestamps are viewed as matching by
+ * default, unless you specify otherwise.
+ * Contents are compared if the lengths are the same
+ * and the timestamps are ignored or the same,
+ * except if you decide to ignore contents to gain speed.
+ * <p>
+ * This is a useful selector to work with programs and tasks that don't handle
+ * dependency checking properly; Even if a predecessor task always creates its
+ * output files, followup tasks can be driven off copies made with a different
+ * selector, so their dependencies are driven on the absolute state of the
+ * files, not a timestamp.
+ * <p>
+ * Clearly, however, bulk file comparisons is inefficient; anything that can
+ * use timestamps is to be preferred. If this selector must be used, use it
+ * over as few files as possible, perhaps following it with an &lt;uptodate;&gt
+ * to keep the descendant routines conditional.
+ *
+ */
+public class DifferentSelector extends MappingSelector {
+
+    private static final FileUtils FILE_UTILS = FileUtils.getFileUtils();
+
+    private boolean ignoreFileTimes = true;
+    private boolean ignoreContents = false;
+
+
+    /**
+     * This flag tells the selector to ignore file times in the comparison
+     * @param ignoreFileTimes if true ignore file times
+     */
+    public void setIgnoreFileTimes(boolean ignoreFileTimes) {
+        this.ignoreFileTimes = ignoreFileTimes;
+    }
+    /**
+     * This flag tells the selector to ignore contents
+     * @param ignoreContents if true ignore contents
+     * @since ant 1.6.3
+     */
+    public void setIgnoreContents(boolean ignoreContents) {
+        this.ignoreContents = ignoreContents;
+    }
+    /**
+     * this test is our selection test that compared the file with the destfile
+     * @param srcfile the source file
+     * @param destfile the destination file
+     * @return true if the files are different
+     */
+    protected boolean selectionTest(File srcfile, File destfile) {
+
+        //if either of them is missing, they are different
+        if (srcfile.exists() != destfile.exists()) {
+            return true;
+        }
+
+        if (srcfile.length() != destfile.length()) {
+            // different size =>different files
+            return true;
+        }
+
+        if (!ignoreFileTimes) {
+            //same date if dest timestamp is within granularity of the srcfile
+            boolean sameDate;
+            sameDate = destfile.lastModified() >= srcfile.lastModified() - granularity
+                    && destfile.lastModified() <= srcfile.lastModified() + granularity;
+
+            // different dates => different files
+            if (!sameDate) {
+                return true;
+            }
+        }
+        if (!ignoreContents) {
+            //here do a bulk comparison
+            try {
+                return !FILE_UTILS.contentEquals(srcfile, destfile);
+            } catch (IOException e) {
+                throw new BuildException("while comparing " + srcfile + " and "
+                        + destfile, e);
+            }
+        } else {
+            return false;
+        }
+    }
+}