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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.maven.shared.scriptinterpreter;
20  
21  import java.io.File;
22  import java.io.PrintStream;
23  import java.net.URL;
24  import java.util.List;
25  import java.util.Map;
26  
27  import groovy.lang.Binding;
28  import groovy.lang.GroovyShell;
29  import org.codehaus.groovy.control.CompilerConfiguration;
30  import org.codehaus.groovy.tools.RootLoader;
31  
32  /**
33   * Provides a facade to evaluate Groovy scripts.
34   *
35   * @author Benjamin Bentmann
36   */
37  class GroovyScriptInterpreter implements ScriptInterpreter {
38  
39      /** {@inheritDoc} */
40      @Override
41      public Object evaluateScript(
42              String script,
43              List<String> classPath,
44              Map<String, ? extends Object> globalVariables,
45              PrintStream scriptOutput)
46              throws ScriptEvaluationException {
47          PrintStream origOut = System.out;
48          PrintStream origErr = System.err;
49  
50          try (RootLoader childFirstLoader =
51                  new RootLoader(new URL[] {}, getClass().getClassLoader())) {
52  
53              if (scriptOutput != null) {
54                  System.setErr(scriptOutput);
55                  System.setOut(scriptOutput);
56              }
57  
58              if (classPath != null && !classPath.isEmpty()) {
59                  for (String path : classPath) {
60                      childFirstLoader.addURL(new File(path).toURI().toURL());
61                  }
62              }
63  
64              GroovyShell interpreter = new GroovyShell(
65                      childFirstLoader,
66                      new Binding(globalVariables),
67                      new CompilerConfiguration(CompilerConfiguration.DEFAULT));
68  
69              return interpreter.evaluate(script);
70          } catch (Throwable e) {
71              throw new ScriptEvaluationException(e);
72          } finally {
73              System.setErr(origErr);
74              System.setOut(origOut);
75          }
76      }
77  }