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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.
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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.javascript;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 * NativeJavaMap is a wrapper for java objects implementing java.util.Map
 *  interface. When {@link Context#FEATURE_ENABLE_JAVA_MAP_ACCESS} is enabled, property based
 * access like map[key] is delegated to {@link Map#get(Object)} or {@link
 * Map#put(Object, Object)} operations so that a JavaMap acts very similar to a
 * javascript Object There is also an iterator to iterate over entries with 
 * for .. of.
 *
 * Limitations: The wrapped map should have String or Integer as
 * key. Otherwise, property based access may not work properly.
 */
public class NativeJavaMap extends NativeJavaObject {

    private static final long serialVersionUID = -3786257752907047381L;

    private Map map;

    static void init(ScriptableObject scope, boolean sealed) {
        NativeJavaMapIterator.init(scope, sealed);
    }

    @SuppressWarnings("unchecked")
    public NativeJavaMap(Scriptable scope, Object map) {
        super(scope, map, map.getClass());
        assert map instanceof Map;
        this.map = (Map) map;
    }

    @Override
    public String getClassName() {
        return "JavaMap";
    }

    @Override
    public boolean has(String name, Scriptable start) {
        Context cx = Context.getCurrentContext();
        if (cx != null && cx.hasFeature(Context.FEATURE_ENABLE_JAVA_MAP_ACCESS)) {
            if (map.containsKey(name)) {
                return true;
            }
        }
        return super.has(name, start);
    }

    @Override
    public boolean has(int index, Scriptable start) {
        Context cx = Context.getCurrentContext();
        if (cx != null && cx.hasFeature(Context.FEATURE_ENABLE_JAVA_MAP_ACCESS)) {
            if (map.containsKey(Integer.valueOf(index))) {
                return true;
            }
        }
        return super.has(index, start);
    }

    @Override
    public boolean has(Symbol key, Scriptable start) {
        if (SymbolKey.ITERATOR.equals(key)) {
            return true;
        }
        return false;
    }

    @Override
    public Object get(String name, Scriptable start) {
        Context cx = Context.getCurrentContext();
        if (cx != null && cx.hasFeature(Context.FEATURE_ENABLE_JAVA_MAP_ACCESS)) {
            if (map.containsKey(name)) {
                Object obj = map.get(name);
                return cx.getWrapFactory().wrap(cx, this, obj, obj == null ? null : obj.getClass());
            }
        }
        return super.get(name, start);
    }

    @Override
    public Object get(int index, Scriptable start) {
        Context cx = Context.getCurrentContext();
        if (cx != null && cx.hasFeature(Context.FEATURE_ENABLE_JAVA_MAP_ACCESS)) {
            if (map.containsKey(Integer.valueOf(index))) {
                Object obj = map.get(Integer.valueOf(index));
                return cx.getWrapFactory().wrap(cx, this, obj, obj == null ? null : obj.getClass());
            }
        }
        return super.get(index, start);
    }

    @Override
    public Object get(Symbol key, Scriptable start) {
        if (SymbolKey.ITERATOR.equals(key)) {
            return symbol_iterator;
        }
        return super.get(key, start);
    }

    @Override
    public void put(String name, Scriptable start, Object value) {
        Context cx = Context.getCurrentContext();
        if (cx != null && cx.hasFeature(Context.FEATURE_ENABLE_JAVA_MAP_ACCESS)) {
            map.put(name, Context.jsToJava(value, Object.class));
        } else {
            super.put(name, start, value);
        }
    }

    @Override
    public void put(int index, Scriptable start, Object value) {
        Context cx = Context.getContext();
        if (cx != null && cx.hasFeature(Context.FEATURE_ENABLE_JAVA_MAP_ACCESS)) {
            map.put(Integer.valueOf(index), Context.jsToJava(value, Object.class));
        } else {
            super.put(index, start, value);
        }
    }

    @Override
    public Object[] getIds() {
        Context cx = Context.getCurrentContext();
        if (cx != null && cx.hasFeature(Context.FEATURE_ENABLE_JAVA_MAP_ACCESS)) {
            List