Groovy example source code file (MethodClosure.java)

This example Groovy source code file (MethodClosure.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

class, class, closure, list, methodclosure, methodclosure, object, object, string, string, util

The Groovy MethodClosure.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 groovy.lang.Closure;
import groovy.lang.MetaMethod;

import java.util.List;


/**
 * Represents a method on an object using a closure which can be invoked
 * at any time
 * 
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @version $Revision: 19868 $
 */
public class MethodClosure extends Closure {

    private String method;
    
    public MethodClosure(Object owner, String method) {
        super(owner);
        this.method = method;

        final Class clazz = owner.getClass()==Class.class?(Class) owner:owner.getClass();
        
        maximumNumberOfParameters = 0;
        parameterTypes = new Class [0];

        List<MetaMethod> methods = InvokerHelper.getMetaClass(clazz).respondsTo(owner, method);
        
        for(MetaMethod m : methods) {
            if (m.getParameterTypes().length > maximumNumberOfParameters) {
                Class[] pt = m.getNativeParameterTypes();
                maximumNumberOfParameters = pt.length;
                parameterTypes = pt;
            }
        }
    }
    
    public String getMethod() {
        return method;
    }

    protected Object doCall(Object arguments) {
        return InvokerHelper.invokeMethod(getOwner(), method, arguments);
    }
    
    public Object getProperty(String property) {
        if ("method".equals(property)) {
            return getMethod();
        } else  return super.getProperty(property);        
    }
}