/*
 * 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</a>
 * @version $Revision$
 */
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);        
    }
}