org.mozilla.javascript.NativeJavaArray Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of rhino Show documentation
The Rhino JavaScript Engine for Java
The newest version!
/* -*- 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.lang.reflect.Array;

/**
 * This class reflects Java arrays into the JavaScript environment.
 *
 * @author Mike Shaver
 * @see NativeJavaClass
 * @see NativeJavaObject
 * @see NativeJavaPackage
 */

public class NativeJavaArray extends NativeJavaObject
{
    static final long serialVersionUID = -924022554283675333L;

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

    public static NativeJavaArray wrap(Scriptable scope, Object array) {
        return new NativeJavaArray(scope, array);
    }

    @Override
    public Object unwrap() {
        return array;
    }

    public NativeJavaArray(Scriptable scope, Object array) {
        super(scope, null, ScriptRuntime.ObjectClass);
        Class cl = array.getClass();
        if (!cl.isArray()) {
            throw new RuntimeException("Array expected");
        }
        this.array = array;
        this.length = Array.getLength(array);
        this.cls = cl.getComponentType();
    }

    @Override
    public boolean has(String id, Scriptable start) {
        return id.equals("length") || super.has(id, start);
    }

    @Override
    public boolean has(int index, Scriptable start) {
        return 0 <= index && index < length;
    }

    @Override
    public Object get(String id, Scriptable start) {
        if (id.equals("length"))
            return Integer.valueOf(length);
        Object result = super.get(id, start);
        if (result == NOT_FOUND &&
            !ScriptableObject.hasProperty(getPrototype(), id))
        {
            throw Context.reportRuntimeError2(
                "msg.java.member.not.found", array.getClass().getName(), id);
        }
        return result;
    }

    @Override
    public Object get(int index, Scriptable start) {
        if (0 <= index && index < length) {
            Context cx = Context.getContext();
            Object obj = Array.get(array, index);
            return cx.getWrapFactory().wrap(cx, this, obj, cls);
        }
        return Undefined.instance;
    }

    @Override
    public void put(String id, Scriptable start, Object value) {
        // Ignore assignments to "length"--it's readonly.
        if (!id.equals("length"))
            throw Context.reportRuntimeError1(
                "msg.java.array.member.not.found", id);
    }

    @Override
    public void put(int index, Scriptable start, Object value) {
        if (0 <= index && index < length) {
            Array.set(array, index, Context.jsToJava(value, cls));
        }
        else {
            throw Context.reportRuntimeError2(
                "msg.java.array.index.out.of.bounds", String.valueOf(index),
                String.valueOf(length - 1));
        }
    }

    @Override
    public Object getDefaultValue(Class hint) {
        if (hint == null || hint == ScriptRuntime.StringClass)
            return array.toString();
        if (hint == ScriptRuntime.BooleanClass)
            return Boolean.TRUE;
        if (hint == ScriptRuntime.NumberClass)
            return ScriptRuntime.NaNobj;
        return this;
    }

    @Override
    public Object[] getIds() {
        Object[] result = new Object[length];
        int i = length;
        while (--i >= 0)
            result[i] = Integer.valueOf(i);
        return result;
    }

    @Override
    public boolean hasInstance(Scriptable value) {
        if (!(value instanceof Wrapper))
            return false;
        Object instance = ((Wrapper)value).unwrap();
        return cls.isInstance(instance);
    }

    @Override
    public Scriptable getPrototype() {
        if (prototype == null) {
            prototype =
                ScriptableObject.getArrayPrototype(this.getParentScope());
        }
        return prototype;
    }

    Object array;
    int length;
    Class cls;
}