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Groovy: A powerful, dynamic language for the JVM

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/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.MetaClass;

import java.util.ArrayList;
import java.util.List;

/**
 * A closure which stores calls in a List so that method calls 
 * can be iterated over in a 'yield' style way
 * 
 * @author James Strachan
 */
public class IteratorClosureAdapter extends Closure {

    private final List list = new ArrayList();
    private MetaClass metaClass = InvokerHelper.getMetaClass(getClass());
    
    public IteratorClosureAdapter(Object delegate) {
        super(delegate);
    }

    public MetaClass getMetaClass() {
        return metaClass;
    }

    public void setMetaClass(MetaClass metaClass) {
        this.metaClass = metaClass;
    }
    
    public List asList() {
        return list;
    }

    protected Object doCall(T argument) {
        list.add(argument);
        return null;
    }
}