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Rhino JavaScript Java Library Source Code
Rhino JavaScript Java Library is an open-source implementation of JavaScript written entirely in Java.
Rhino JavaScript Java Library Source Code files are provided in binary package (rhino-1.7.14.zip).
You can also browse the source code below:
✍: FYIcenter.com
⏎ org/mozilla/javascript/Undefined.java
/* -*- 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.io.Serializable; /** * This class implements the Undefined value in JavaScript. * * <p>We represent "undefined" internally using two static objects -- "Undefined.instance" and * SCRIPTABLE_UNDEFINED. Java code that needs to make something undefined should generally use the * first, and use the second if a Scriptable object is absolutely required. * * <p>Java code that needs to test whether something is undefined <b>must</b> use the "isUndefined" * method because of the multiple internal representations. */ public class Undefined implements Serializable { private static final long serialVersionUID = 9195680630202616767L; /** * This is the standard value for "undefined" in Rhino. Java code that needs to represent * "undefined" should use this object (rather than a new instance of this class). */ public static final Object instance = new Undefined(); private static final int instanceHash = System.identityHashCode(instance); private Undefined() {} public Object readResolve() { return instance; } @Override public boolean equals(Object obj) { return isUndefined(obj) || super.equals(obj); } @Override public int hashCode() { // All instances of Undefined are equivalent! return instanceHash; } /** * An alternate representation of undefined, to be used only when we need to pass it to a method * that takes as Scriptable as a parameter. This is used when we need to pass undefined as the * "this" parmeter of a Callable instance, because we cannot change that interface without * breaking backward compatibility. */ public static final Scriptable SCRIPTABLE_UNDEFINED = new Scriptable() { @Override public String getClassName() { return "undefined"; } @Override public Object get(String name, Scriptable start) { return NOT_FOUND; } @Override public Object get(int index, Scriptable start) { return NOT_FOUND; } @Override public boolean has(String name, Scriptable start) { return false; } @Override public boolean has(int index, Scriptable start) { return false; } @Override public void put(String name, Scriptable start, Object value) {} @Override public void put(int index, Scriptable start, Object value) {} @Override public void delete(String name) {} @Override public void delete(int index) {} @Override public Scriptable getPrototype() { return null; } @Override public void setPrototype(Scriptable prototype) {} @Override public Scriptable getParentScope() { return null; } @Override public void setParentScope(Scriptable parent) {} @Override public Object[] getIds() { return ScriptRuntime.emptyArgs; } @Override public Object getDefaultValue(Class<?> hint) { if (hint == null || hint == ScriptRuntime.StringClass) { return toString(); } return null; } @Override public boolean hasInstance(Scriptable instance) { return false; } @Override public String toString() { return "undefined"; } @Override public boolean equals(Object obj) { return isUndefined(obj) || super.equals(obj); } @Override public int hashCode() { return instanceHash; } }; /** * Safely test whether "obj" is undefined. Java code must use this function rather than testing * the value directly since we have two representations of undefined in Rhino. */ public static boolean isUndefined(Object obj) { return Undefined.instance == obj || Undefined.SCRIPTABLE_UNDEFINED == obj; } }
⏎ org/mozilla/javascript/Undefined.java
Or download all of them as a single archive file:
File name: rhino-1.7.14-sources.jar File size: 1029165 bytes Release date: 2022-01-06 Download
⇒ Example code to Test rhino-runtime-1.7.14.jar
⇐ Download Rhino JavaScript Binary Package
2022-05-03, 35510👍, 1💬
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