FunctionMapper.java

/*
 * Based on JUEL 2.2.1 code, 2006-2009 Odysseus Software GmbH
 *
 * Licensed 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.activiti.engine.impl.javax.el;

import java.lang.reflect.Method;

/**
 * The interface to a map between EL function names and methods. A FunctionMapper maps
 * ${prefix:name()} style functions to a static method that can execute that function.
 */
public abstract class FunctionMapper {
	/**
	 * Resolves the specified prefix and local name into a java.lang.Method. Returns null if no
	 * function could be found that matches the given prefix and local name.
	 * 
	 * @param prefix
	 *            the prefix of the function, or "" if no prefix. For example, "fn" in
	 *            ${fn:method()}, or "" in ${method()}.
	 * @param localName
	 *            the short name of the function. For example, "method" in ${fn:method()}.
	 * @return the static method to invoke, or null if no match was found.
	 */
	public abstract Method resolveFunction(String prefix, String localName);
}