1 /*
   2  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nashorn.ant;
  27 
  28 import javax.script.ScriptEngine;
  29 import javax.script.ScriptEngineManager;
  30 import javax.script.ScriptException;
  31 import org.apache.tools.ant.Project;
  32 import org.apache.tools.ant.Task;
  33 import org.apache.tools.ant.BuildException;
  34 
  35 /**
  36  * This class implements an ant task to evaluate nashorn scripts
  37  * from ant projects.
  38  */
  39 public final class NashornTask extends Task {
  40     // Underlying nashorn script engine
  41     private final ScriptEngine engine;
  42     // the current ant project
  43     private Project project;
  44     // the script evaluated by this task
  45     private String script;
  46 
  47     public NashornTask() {
  48         final ScriptEngineManager m = new ScriptEngineManager();
  49         this.engine = m.getEngineByName("nashorn");
  50     }
  51 
  52     @Override
  53     public void setProject(Project proj) {
  54         this.project = proj;
  55     }
  56 
  57     // set the script to be evaluated
  58     public void addText(String text) {
  59         this.script = text;
  60     }
  61 
  62     @Override
  63     public void execute() {
  64         // expose project as "project" variable
  65         engine.put("project", project);
  66         // expose this task as "self" variable
  67         engine.put("self", this);
  68 
  69         // evaluate specified script
  70         try {
  71             engine.eval(script);
  72         } catch (final ScriptException se) {
  73             throw new BuildException(se);
  74         }
  75     }
  76 }