1 files changed, 81 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/comparators/ResourceComparator.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/comparators/ResourceComparator.java
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+++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/comparators/ResourceComparator.java
@@ -0,0 +1,81 @@
+/*
+ *  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.resources.comparators;
+
+import java.util.Comparator;
+
+import org.apache.tools.ant.types.DataType;
+import org.apache.tools.ant.types.Resource;
+
+/**
+ * Abstract Resource Comparator.
+ * @since Ant 1.7
+ */
+public abstract class ResourceComparator extends DataType implements Comparator<Resource> {
+
+    /**
+     * Compare two objects.
+     * @param foo the first Object.
+     * @param bar the second Object.
+     * @return a negative integer, zero, or a positive integer as the first
+     *         argument is less than, equal to, or greater than the second.
+     * @throws ClassCastException if either argument is null.
+     */
+    public final int compare(Resource foo, Resource bar) {
+        dieOnCircularReference();
+        ResourceComparator c =
+            isReference() ? (ResourceComparator) getCheckedRef() : this;
+        return c.resourceCompare(foo, bar);
+    }
+
+    /**
+     * Test for equality with this ResourceComparator.
+     * @param o the Object to compare against.
+     * @return true if the specified Object equals this one.
+     */
+    public boolean equals(Object o) {
+        if (isReference()) {
+            return getCheckedRef().equals(o);
+        }
+        if (o == null) {
+            return false;
+        }
+        return o == this || o.getClass().equals(getClass());
+    }
+
+    /**
+     * Hashcode based on the rules for equality.
+     * @return a hashcode.
+     */
+    public synchronized int hashCode() {
+        if (isReference()) {
+            return getCheckedRef().hashCode();
+        }
+        return getClass().hashCode();
+    }
+
+    /**
+     * Compare two Resources.
+     * @param foo the first Resource.
+     * @param bar the second Resource.
+     * @return a negative integer, zero, or a positive integer as the first
+     *         argument is less than, equal to, or greater than the second.
+     */
+    protected abstract int resourceCompare(Resource foo, Resource bar);
+
+}