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J2V8 is a set of Java bindings for V8
There is a newer version: 3.0.2
/*******************************************************************************
 * Copyright (c) 2014 EclipseSource and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    EclipseSource - initial API and implementation
 ******************************************************************************/
package com.eclipsesource.v8;

abstract public class V8Value {

    public static final int NULL                    = 0;
    public static final int UNKNOWN                 = 0;
    public static final int INTEGER                 = 1;
    public static final int DOUBLE                  = 2;
    public static final int BOOLEAN                 = 3;
    public static final int STRING                  = 4;
    public static final int V8_ARRAY                = 5;
    public static final int V8_OBJECT               = 6;
    public static final int UNDEFINED               = 99;

    protected static int    v8ObjectInstanceCounter = 1;
    protected V8            v8;
    protected int           objectHandle;
    protected boolean       released                = true;

    public V8Value() {
        super();
    }

    protected void initialize(final int runtimeHandle, final int objectHandle) {
        v8._initNewV8Object(runtimeHandle, objectHandle);
        v8.addObjRef();
        released = false;
    }

    public boolean isUndefined() {
        return false;
    }

    public int getHandle() {
        return objectHandle;
    }

    public void release() {
        V8.checkThread();
        if ( !released ) {
            released = true;
            v8._release(v8.getV8RuntimeHandle(), objectHandle);
            v8.releaseObjRef();
        }
    }

    @Override
    public boolean equals(final Object that) {
        V8.checkThread();
        checkReleaesd();
        if (that == this) {
            return true;
        }
        if (that == null) {
            return false;
        }
        if ((that.getClass() == this.getClass())) {
            return v8._equals(v8.getV8RuntimeHandle(), getHandle(), ((V8Object) that).getHandle());
        }
        return false;
    }

    @Override
    public int hashCode() {
        V8.checkThread();
        checkReleaesd();
        return v8._identityHash(v8.getV8RuntimeHandle(), getHandle());
    }

    public boolean isReleased() {
        return released;
    }

    @Override
    public abstract String toString();

    protected void checkReleaesd() {
        if (released) {
            throw new IllegalStateException("Object released");
        }
    }

}