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Groovy: A powerful, dynamic language for the JVM
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/*
 * 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 java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;


/**
 * Represents a method on an object using a closure which can be invoked
 * at any time
 * 
 * @author James Strachan
 * @version $Revision: 9556 $
 */
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];

        Method[] methods = (Method[]) AccessController.doPrivileged(new  PrivilegedAction() {
            public Object run() {
                return clazz.getMethods();
            }
        });
        for (int j = 0; j < methods.length; j++) {
            if (method.equals(methods[j].getName()) && methods[j].getParameterTypes().length > maximumNumberOfParameters) {
                Class[] pt = methods[j].getParameterTypes();
                maximumNumberOfParameters = pt.length;
                parameterTypes = pt;
            }
        }        
        methods = (Method[]) AccessController.doPrivileged(new  PrivilegedAction() {
            public Object run() {
                return clazz.getDeclaredMethods();
            }
        });
        for (int j = 0; j < methods.length; j++) {
            if (method.equals(methods[j].getName()) && methods[j].getParameterTypes().length > maximumNumberOfParameters) {
                Class[] pt = methods[j].getParameterTypes();
                maximumNumberOfParameters = pt.length;
                parameterTypes = pt;
            }
        }

    }
    
    public String getMethod() {
        return method;
    }

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