001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.scripting.groovy;
016    
017    import com.liferay.portal.kernel.scripting.BaseScriptingExecutor;
018    import com.liferay.portal.kernel.scripting.ExecutionException;
019    import com.liferay.portal.kernel.scripting.ScriptingException;
020    import com.liferay.portal.kernel.util.AggregateClassLoader;
021    import com.liferay.portal.kernel.util.ArrayUtil;
022    import com.liferay.portal.util.ClassLoaderUtil;
023    
024    import groovy.lang.Binding;
025    import groovy.lang.GroovyShell;
026    import groovy.lang.Script;
027    
028    import java.util.HashMap;
029    import java.util.Map;
030    import java.util.Set;
031    import java.util.WeakHashMap;
032    
033    /**
034     * @author Alberto Montero
035     * @author Brian Wing Shun Chan
036     */
037    public class GroovyExecutor extends BaseScriptingExecutor {
038    
039            @Override
040            public Map<String, Object> eval(
041                            Set<String> allowedClasses, Map<String, Object> inputObjects,
042                            Set<String> outputNames, String script, ClassLoader... classLoaders)
043                    throws ScriptingException {
044    
045                    if (allowedClasses != null) {
046                            throw new ExecutionException(
047                                    "Constrained execution not supported for Groovy");
048                    }
049    
050                    GroovyShell groovyShell = getGroovyShell(classLoaders);
051    
052                    Script compiledScript = groovyShell.parse(script);
053    
054                    Binding binding = new Binding(inputObjects);
055    
056                    compiledScript.setBinding(binding);
057    
058                    compiledScript.run();
059    
060                    if (outputNames == null) {
061                            return null;
062                    }
063    
064                    Map<String, Object> outputObjects = new HashMap<String, Object>();
065    
066                    for (String outputName : outputNames) {
067                            outputObjects.put(outputName, binding.getVariable(outputName));
068                    }
069    
070                    return outputObjects;
071            }
072    
073            @Override
074            public String getLanguage() {
075                    return _LANGUAGE;
076            }
077    
078            protected GroovyShell getGroovyShell(ClassLoader[] classLoaders) {
079                    if (ArrayUtil.isEmpty(classLoaders)) {
080                            if (_groovyShell == null) {
081                                    synchronized (this) {
082                                            if (_groovyShell == null) {
083                                                    _groovyShell = new GroovyShell();
084                                            }
085                                    }
086                            }
087    
088                            return _groovyShell;
089                    }
090    
091                    ClassLoader aggregateClassLoader =
092                            AggregateClassLoader.getAggregateClassLoader(
093                                    ClassLoaderUtil.getPortalClassLoader(), classLoaders);
094    
095                    GroovyShell groovyShell = null;
096    
097                    if (!_groovyShells.containsKey(aggregateClassLoader)) {
098                            synchronized (this) {
099                                    if (!_groovyShells.containsKey(aggregateClassLoader)) {
100                                            groovyShell = new GroovyShell(aggregateClassLoader);
101    
102                                            _groovyShells.put(aggregateClassLoader, groovyShell);
103                                    }
104                            }
105                    }
106    
107                    return groovyShell;
108            }
109    
110            private static final String _LANGUAGE = "groovy";
111    
112            private volatile GroovyShell _groovyShell = new GroovyShell();
113            private volatile Map<ClassLoader, GroovyShell> _groovyShells =
114                    new WeakHashMap<ClassLoader, GroovyShell>();
115    
116    }