1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * This library is free software; you can redistribute it and/or modify it under
5    * the terms of the GNU Lesser General Public License as published by the Free
6    * Software Foundation; either version 2.1 of the License, or (at your option)
7    * any later version.
8    *
9    * This library is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11   * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
12   * details.
13   */
14  
15  package com.liferay.portal.scripting.groovy;
16  
17  import com.liferay.portal.kernel.cache.SingleVMPoolUtil;
18  import com.liferay.portal.kernel.scripting.ExecutionException;
19  import com.liferay.portal.kernel.scripting.ScriptingException;
20  import com.liferay.portal.kernel.scripting.ScriptingExecutor;
21  
22  import groovy.lang.Binding;
23  import groovy.lang.GroovyShell;
24  import groovy.lang.Script;
25  
26  import java.util.HashMap;
27  import java.util.Map;
28  import java.util.Set;
29  
30  /**
31   * <a href="GroovyExecutor.java.html"><b><i>View Source</i></b></a>
32   *
33   * @author Alberto Montero
34   * @author Brian Wing Shun Chan
35   */
36  public class GroovyExecutor implements ScriptingExecutor {
37  
38      public static final String CACHE_NAME = GroovyExecutor.class.getName();
39  
40      public static final String LANGUAGE = "groovy";
41  
42      public void clearCache() {
43          SingleVMPoolUtil.clear(CACHE_NAME);
44      }
45  
46      public String getLanguage() {
47          return LANGUAGE;
48      }
49  
50      public Map<String, Object> eval(
51              Set<String> allowedClasses, Map<String, Object> inputObjects,
52              Set<String> outputNames, String script)
53          throws ScriptingException {
54  
55          if (allowedClasses != null) {
56              throw new ExecutionException(
57                  "Constrained execution not supported for Groovy");
58          }
59  
60          Script compiledScript = getCompiledScript(script);
61  
62          Binding binding = new Binding(inputObjects);
63  
64          compiledScript.setBinding(binding);
65  
66          compiledScript.run();
67  
68          if (outputNames == null) {
69              return null;
70          }
71  
72          Map<String, Object> outputObjects = new HashMap<String, Object>();
73  
74          for (String outputName : outputNames) {
75              outputObjects.put(outputName, binding.getVariable(outputName));
76          }
77  
78          return outputObjects;
79      }
80  
81      protected Script getCompiledScript(String script) {
82          if (_groovyShell == null) {
83              synchronized (this) {
84                  _groovyShell = new GroovyShell();
85              }
86          }
87  
88          String key = String.valueOf(script.hashCode());
89  
90          Script compiledScript = (Script)SingleVMPoolUtil.get(CACHE_NAME, key);
91  
92          if (compiledScript == null) {
93              compiledScript = _groovyShell.parse(script);
94  
95              SingleVMPoolUtil.put(CACHE_NAME, key, compiledScript);
96          }
97  
98          return compiledScript;
99      }
100 
101     private GroovyShell _groovyShell;
102 
103 }