Groovy example source code file (ConvertedMap.java)

This example Groovy source code file (ConvertedMap.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

closure, closure, conversionhandler, convertedmap, convertedmap, map, map, method, object, object, reflection, string, throwable, unsupportedoperationexception, util

The Groovy ConvertedMap.java source code

/*
 * Copyright 2003-2007 the original author or authors.
 *
 * 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.codehaus.groovy.runtime;

import java.lang.reflect.Method;
import java.util.Map;

import groovy.lang.Closure;

/**
 * This class is a general adapter to adapt a map of closures to
 * any Java interface.
 * <p/>
 *
 * @author <a href="mailto:blackdrag@gmx.org">Jochen Theodorou
 */
public class ConvertedMap extends ConversionHandler {

    /**
     * to create a ConvertedMap object.
     *
     * @param closures the map of closures
     */
    protected ConvertedMap(Map closures) {
        super(closures);
    }

    public Object invokeCustom(Object proxy, Method method, Object[] args)
            throws Throwable {
        Map m = (Map) getDelegate();
        Closure cl = (Closure) m.get(method.getName());
        if (cl == null) {
            throw new UnsupportedOperationException();
        }
        return cl.call(args);
    }

    public String toString() {
        return DefaultGroovyMethods.toString(getDelegate());
    }

    protected boolean checkMethod(Method method) {
        return isCoreObjectMethod(method);
    }

    /**
     * Checks whether a method is a core method from java.lang.Object.
     * Such methods often receive special treatment because they are
     * deemed fundamental enough to not be tampered with.
     * call toString() is an exception to allow overriding toString() by a closure specified in the map
     *
     * @param method the method to check
     * @return true if the method is deemed to be a core method
     */
    public static boolean isCoreObjectMethod(Method method) {
        return ConversionHandler.isCoreObjectMethod(method) && !"toString".equals(method.getName());
    }
}