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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 groovy.json;

import groovy.lang.Closure;
import groovy.lang.GroovyObjectSupport;

import java.util.*;

/**
 * Utility class used as delegate of closures representing JSON objects.
 *
 * @author Guillaume Laforge
 * @author Andrey Bloschetsov
 * @since 1.8.0
 */
public class JsonDelegate extends GroovyObjectSupport {

    private Map content = new LinkedHashMap();

    /**
     * Intercepts calls for setting a key and value for a JSON object
     *
     * @param name the key name
     * @param args the value associated with the key
     */
    public Object invokeMethod(String name, Object args) {
        Object val = null;
        if (args != null && Object[].class.isAssignableFrom(args.getClass())) {
            Object[] arr = (Object[]) args;

            if (arr.length == 1) {
                val = arr[0];
            } else if (arr.length == 2 && arr[0] instanceof Collection && arr[1] instanceof Closure) {
                Closure closure = (Closure) arr[1];
                Iterator iterator = ((Collection) arr[0]).iterator();
                List