Java example source code file (JavaScriptScopeTest.java)

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Java - Java tags/keywords

bindings, javascriptscopetest, runtimeexception, scriptengine, scriptenginemanager

The JavaScriptScopeTest.java Java example source code

/*
 * Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @test
 * @bug 6346733 6705893
 * @summary Verify that independent Bindings instances don't
 * get affected by default scope assignments. Also, verify
 * that script globals can be created and accessed from Java
 * as well as JavaScript.
 */

import javax.script.*;

public class JavaScriptScopeTest {

        public static void main(String[] args) throws Exception {
            ScriptEngineManager manager = new ScriptEngineManager();
            ScriptEngine jsengine = Helper.getJsEngine(manager);
            if (jsengine == null) {
                System.out.println("Warning: No js engine found; test vacuously passes.");
                return;
            }
            jsengine.eval("var v = 'hello';");
            // Create a new scope
            Bindings b = jsengine.createBindings();
            // b is newly created scope. We don't expect 'v' there.
            // we expect b to be empty...
            if (b.keySet().size() != 0) {
                throw new RuntimeException("no variables expected in new scope");
            }

            // verify that we can create new variable from Java
            jsengine.put("fromJava", "hello world");
            // below should execute without problems..
            jsengine.eval(" if (fromJava != 'hello world') throw 'unexpected'");

            // verify that script globals are exposed to Java
            // we have created 'v' and 'fromJava' already.
            if (! jsengine.get("v").equals("hello")) {
                throw new RuntimeException("unexpected value of 'v'");
            }

            if (! jsengine.get("fromJava").equals("hello world")) {
                throw new RuntimeException("unexpected value of 'fromJava'");
            }
        }
}