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java/org/apache/el/lang/FunctionMapperFactory.java

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+/*
+ * 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.el.lang;
+
+import java.lang.reflect.Method;
+
+import javax.el.FunctionMapper;
+
+/**
+ * @author Jacob Hookom [jacob@hookom.net]
+ */
+public class FunctionMapperFactory extends FunctionMapper {
+
+    protected FunctionMapperImpl memento = null;
+    protected final FunctionMapper target;
+
+    public FunctionMapperFactory(FunctionMapper mapper) {
+        if (mapper == null) {
+            throw new NullPointerException("FunctionMapper target cannot be null");
+        }
+        this.target = mapper;
+    }
+
+
+    /* (non-Javadoc)
+     * @see javax.el.FunctionMapper#resolveFunction(java.lang.String, java.lang.String)
+     */
+    @Override
+    public Method resolveFunction(String prefix, String localName) {
+        if (this.memento == null) {
+            this.memento = new FunctionMapperImpl();
+        }
+        Method m = this.target.resolveFunction(prefix, localName);
+        if (m != null) {
+            this.memento.mapFunction(prefix, localName, m);
+        }
+        return m;
+    }
+
+
+    @Override
+    public void mapFunction(String prefix, String localName, Method method) {
+        if (this.memento == null) {
+            this.memento = new FunctionMapperImpl();
+        }
+        memento.mapFunction(prefix, localName, method);
+    }
+
+
+    public FunctionMapper create() {
+        return this.memento;
+    }
+
+}