Groovy example source code file (ClosureStaticMetaMethod.java)

This example Groovy source code file (ClosureStaticMetaMethod.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

cachedclass, class, class, closure, closure, closureinvokingmethod, closurestaticmetamethod, closurestaticmetamethod, metamethod, object, object, reflection, string

The Groovy ClosureStaticMetaMethod.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.metaclass;

import groovy.lang.Closure;
import groovy.lang.ClosureInvokingMethod;
import groovy.lang.MetaMethod;
import org.codehaus.groovy.reflection.CachedClass;
import org.codehaus.groovy.reflection.ReflectionCache;

import java.lang.reflect.Modifier;

/**
 * This class represents a MetaMethod that is a closure that pretends to be a static method.
 * It is used by ExpandoMetaClass to allow addition of static methods defined as closures
 *
 * @author Graeme Rocher
 * @since 01.1
 */
public class ClosureStaticMetaMethod extends MetaMethod implements ClosureInvokingMethod {

    private final Closure callable;
    private final CachedClass declaringClass;
    private final String name;

    /**
     *
     * @param name The name of the MetaMethod
     * @param declaringClass The class which declared the MetaMethod
     * @param c The closure that this ClosureMetaMethod will invoke when called
     */
    public ClosureStaticMetaMethod(String name, Class declaringClass, Closure c) {
        this(name, declaringClass, c, c.getParameterTypes());
    }

    public ClosureStaticMetaMethod(String name, Class declaringClass, Closure c, Class[] paramTypes) {
        super(paramTypes);
        this.callable = c;
        this.declaringClass = ReflectionCache.getCachedClass(declaringClass);
        this.name = name;
    }
    
    public Object invoke(Object object, Object[] arguments) {
        Closure cloned = (Closure) callable.clone();
        cloned.setDelegate(object);
        return cloned.call(arguments);
    }

    public int getModifiers() {
        return Modifier.PUBLIC | Modifier.STATIC;
    }

    public String getName() {
        return name;
    }

    public Class getReturnType() {
        return Object.class;
    }

    public CachedClass getDeclaringClass() {
        return this.declaringClass;
    }

    /**
     * Retrieves the closure that is invoked by this MetaMethod
     *
     * @return The closure
     */
    public Closure getClosure() {
        return this.callable;
    }
}