Source Code Cross Referenced for JavaxScriptRunner.java in  » Build » ANT » org » apache » tools » ant » util » optional » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Build » ANT » org.apache.tools.ant.util.optional 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Licensed to the Apache Software Foundation (ASF) under one or more
003:         *  contributor license agreements.  See the NOTICE file distributed with
004:         *  this work for additional information regarding copyright ownership.
005:         *  The ASF licenses this file to You under the Apache License, Version 2.0
006:         *  (the "License"); you may not use this file except in compliance with
007:         *  the License.  You may obtain a copy of the License at
008:         *
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         *  Unless required by applicable law or agreed to in writing, software
012:         *  distributed under the License is distributed on an "AS IS" BASIS,
013:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         *  See the License for the specific language governing permissions and
015:         *  limitations under the License.
016:         *
017:         */
018:
019:        package org.apache.tools.ant.util.optional;
020:
021:        import org.apache.tools.ant.BuildException;
022:
023:        import java.util.Iterator;
024:        import org.apache.tools.ant.util.ScriptRunnerBase;
025:        import org.apache.tools.ant.util.ReflectUtil;
026:        import org.apache.tools.ant.util.ReflectWrapper;
027:
028:        /**
029:         * This class is used to run scripts using JSR 223.
030:         * @since Ant 1.7.0
031:         */
032:        public class JavaxScriptRunner extends ScriptRunnerBase {
033:            private ReflectWrapper engine;
034:
035:            /**
036:             * Get the name of the manager prefix.
037:             * @return "javax"
038:             */
039:            public String getManagerName() {
040:                return "javax";
041:            }
042:
043:            /** {@inheritDoc}. */
044:            public boolean supportsLanguage() {
045:                if (engine != null) {
046:                    return true;
047:                }
048:                checkLanguage();
049:                ClassLoader origLoader = replaceContextLoader();
050:                try {
051:                    return createEngine() != null;
052:                } catch (Exception ex) {
053:                    return false;
054:                } finally {
055:                    restoreContextLoader(origLoader);
056:                }
057:            }
058:
059:            /**
060:             * Do the work to run the script.
061:             *
062:             * @param execName the name that will be passed to the
063:             *                 scripting engine for this script execution.
064:             *
065:             * @exception BuildException if someting goes wrong exectuing the script.
066:             */
067:            public void executeScript(String execName) throws BuildException {
068:                evaluateScript(execName);
069:            }
070:
071:            /**
072:             * Do the work to eval the script.
073:             *
074:             * @param execName the name that will be passed to the
075:             *                 scripting engine for this script execution.
076:             * @return the result of the evalulation
077:             * @exception BuildException if someting goes wrong exectuing the script.
078:             */
079:            public Object evaluateScript(String execName) throws BuildException {
080:                checkLanguage();
081:                ClassLoader origLoader = replaceContextLoader();
082:                try {
083:                    ReflectWrapper engine = createEngine();
084:                    if (engine == null) {
085:                        throw new BuildException(
086:                                "Unable to create javax script engine for "
087:                                        + getLanguage());
088:                    }
089:                    for (Iterator i = getBeans().keySet().iterator(); i
090:                            .hasNext();) {
091:                        String key = (String) i.next();
092:                        Object value = getBeans().get(key);
093:                        engine.invoke("put", String.class, key, Object.class,
094:                                value);
095:                    }
096:                    // execute the script
097:                    return engine.invoke("eval", String.class, getScript());
098:                } catch (Exception be) {
099:                    Throwable t = be;
100:                    Throwable te = (Throwable) ReflectUtil.invoke(be,
101:                            "getCause");
102:                    if (te != null) {
103:                        if (te instanceof  BuildException) {
104:                            throw (BuildException) te;
105:                        } else {
106:                            t = te;
107:                        }
108:                    }
109:                    throw new BuildException(t);
110:                } finally {
111:                    restoreContextLoader(origLoader);
112:                }
113:            }
114:
115:            private ReflectWrapper createEngine() throws Exception {
116:                if (engine != null) {
117:                    return engine;
118:                }
119:                ReflectWrapper manager = new ReflectWrapper(getClass()
120:                        .getClassLoader(), "javax.script.ScriptEngineManager");
121:                Object e = manager.invoke("getEngineByName", String.class,
122:                        getLanguage());
123:                if (e == null) {
124:                    return null;
125:                }
126:                ReflectWrapper ret = new ReflectWrapper(e);
127:                if (getKeepEngine()) {
128:                    this.engine = ret;
129:                }
130:                return ret;
131:            }
132:        }
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