MultiScopes.java revision 1088:7e62d98d4625 
1/*
2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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7 *
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9 *     notice, this list of conditions and the following disclaimer.
10 *
11 *   - Redistributions in binary form must reproduce the above copyright
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14 *
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17 *     from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32import javax.script.Bindings;
33import javax.script.ScriptContext;
34import javax.script.ScriptEngine;
35import javax.script.ScriptEngineManager;
36import javax.script.SimpleScriptContext;
37
38@SuppressWarnings("javadoc")
39public class MultiScopes {
40    public static void main(final String[] args) throws Exception {
41        final ScriptEngineManager manager = new ScriptEngineManager();
42        final ScriptEngine engine = manager.getEngineByName("nashorn");
43
44        engine.put("x", "hello");
45        // print global variable "x"
46        engine.eval("print(x);");
47        // the above line prints "hello"
48
49        // Now, pass a different script context
50        final ScriptContext newContext = new SimpleScriptContext();
51        newContext.setBindings(engine.createBindings(), ScriptContext.ENGINE_SCOPE);
52        final Bindings engineScope = newContext.getBindings(ScriptContext.ENGINE_SCOPE);
53
54        // add new variable "x" to the new engineScope
55        engineScope.put("x", "world");
56
57        // execute the same script - but this time pass a different script context
58        engine.eval("print(x);", newContext);
59        // the above line prints "world"
60    }
61}
62
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64