1 files changed, 56 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/BaseResourceCollectionWrapper.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/BaseResourceCollectionWrapper.java
new file mode 100644
index 00000000..78ba95ee
--- /dev/null
+++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/BaseResourceCollectionWrapper.java
@@ -0,0 +1,56 @@
+/*
+ *  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;
+
+import java.util.Collection;
+import java.util.Iterator;
+
+import org.apache.tools.ant.types.Resource;
+
+/**
+ * Base class for a ResourceCollection that wraps a single nested
+ * ResourceCollection.
+ * @since Ant 1.7
+ */
+public abstract class BaseResourceCollectionWrapper
+    extends AbstractResourceCollectionWrapper {
+
+    private Collection<Resource> coll = null;
+
+    protected Iterator<Resource> createIterator() {
+        return cacheCollection().iterator();
+    }
+
+	protected int getSize() {
+        return cacheCollection().size();
+    }
+
+    /**
+     * Template method for subclasses to return a Collection of Resources.
+     * @return Collection.
+     */
+    protected abstract Collection<Resource> getCollection();
+
+    private synchronized Collection<Resource> cacheCollection() {
+        if (coll == null || !isCache()) {
+            coll = getCollection();
+        }
+        return coll;
+    }
+
+}