Clover coverage report - groovy - 1.0-beta-6
Coverage timestamp: Thu Jul 15 2004 13:18:22 BST
file stats: LOC: 203   Methods: 9
NCLOC: 91   Classes: 1
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 Source file Conditionals Statements Methods TOTAL
GroovyEngine.java 0% 0% 0% 0%
coverage
 1   
 /*
 2   
  $Id: GroovyEngine.java,v 1.8 2004/05/17 22:27:11 glaforge Exp $
 3   
 
 4   
  Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
 5   
 
 6   
  Redistribution and use of this software and associated documentation
 7   
  ("Software"), with or without modification, are permitted provided
 8   
  that the following conditions are met:
 9   
 
 10   
  1. Redistributions of source code must retain copyright
 11   
     statements and notices.  Redistributions must also contain a
 12   
     copy of this document.
 13   
 
 14   
  2. Redistributions in binary form must reproduce the
 15   
     above copyright notice, this list of conditions and the
 16   
     following disclaimer in the documentation and/or other
 17   
     materials provided with the distribution.
 18   
 
 19   
  3. The name "groovy" must not be used to endorse or promote
 20   
     products derived from this Software without prior written
 21   
     permission of The Codehaus.  For written permission,
 22   
     please contact info@codehaus.org.
 23   
 
 24   
  4. Products derived from this Software may not be called "groovy"
 25   
     nor may "groovy" appear in their names without prior written
 26   
     permission of The Codehaus. "groovy" is a registered
 27   
     trademark of The Codehaus.
 28   
 
 29   
  5. Due credit should be given to The Codehaus -
 30   
     http://groovy.codehaus.org/
 31   
 
 32   
  THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
 33   
  ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 34   
  NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 35   
  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 36   
  THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 37   
  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 38   
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 39   
  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 40   
  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 41   
  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 42   
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 43   
  OF THE POSSIBILITY OF SUCH DAMAGE.
 44   
 
 45   
  */
 46   
 package org.codehaus.groovy.bsf;
 47   
 
 48   
 import groovy.lang.Closure;
 49   
 import groovy.lang.GroovyShell;
 50   
 
 51   
 import java.util.Vector;
 52   
 
 53   
 import org.apache.bsf.BSFDeclaredBean;
 54   
 import org.apache.bsf.BSFException;
 55   
 import org.apache.bsf.BSFManager;
 56   
 import org.apache.bsf.util.BSFEngineImpl;
 57   
 import org.apache.bsf.util.BSFFunctions;
 58   
 import org.codehaus.groovy.runtime.InvokerHelper;
 59   
 
 60   
 /**
 61   
  * A BSF Engine for the <a href="http://groovy.codehaus.org/">Groovy</a> 
 62   
  * scripting language.
 63   
  * 
 64   
  * It's derived from the Jython / JPython engine
 65   
  *
 66   
  * @author James Strachan
 67   
  */
 68   
 public class GroovyEngine extends BSFEngineImpl {
 69   
     private static final String[] EMPTY_ARGS = {
 70   
     };
 71   
 
 72   
     protected GroovyShell shell;
 73   
 
 74   
     /**
 75   
      * Convert a non java class name to a java classname
 76   
      * This is used to convert a script name to a name
 77   
      * that can be used as a classname with the script is
 78   
      * loaded in GroovyClassloader#load()
 79   
      * The method simply replaces any invalid characters
 80   
      * with "_".
 81   
      */
 82  0
     private String convertToValidJavaClassname(String inName) {
 83  0
         if (inName == null || inName == "") {
 84  0
             return "_";
 85   
         }
 86  0
         StringBuffer output = new StringBuffer(inName.length());
 87  0
         boolean firstChar = true;
 88  0
         for (int i = 0; i < inName.length(); ++i) {
 89  0
             char ch = inName.charAt(i);
 90  0
             if (firstChar && !Character.isJavaIdentifierStart(ch)) {
 91  0
                 ch = '_';
 92  0
             } else if (!firstChar
 93   
                        && !(Character.isJavaIdentifierPart(ch) || ch == '.')) {
 94  0
                 ch = '_';
 95   
             }
 96  0
             firstChar = (ch == '.');
 97  0
             output.append(ch);
 98   
         }
 99  0
         return output.toString();
 100   
     }
 101   
     
 102   
     /**
 103   
      * Allow an anonymous function to be declared and invoked
 104   
      */
 105  0
     public Object apply(
 106   
         java.lang.String source,
 107   
         int lineNo,
 108   
         int columnNo,
 109   
         Object funcBody,
 110   
         Vector paramNames,
 111   
         Vector arguments)
 112   
         throws BSFException {
 113   
         
 114  0
         Object object = eval(source, lineNo, columnNo, funcBody);
 115  0
         if (object instanceof Closure) {
 116   
             // lets call the function
 117   
 
 118   
             /** @todo we could turn the 2 vectors into a Map */
 119  0
             Closure closure = (Closure) object;
 120  0
             return closure.call(arguments.toArray());
 121   
         }
 122  0
         return object;
 123   
     }
 124   
 
 125   
     /**
 126   
      * Call the named method of the given object.
 127   
      */
 128  0
     public Object call(Object object, String method, Object[] args) throws BSFException {
 129  0
         return InvokerHelper.invokeMethod(object, method, args);
 130   
     }
 131   
 
 132   
     /**
 133   
      * Declare a bean
 134   
      */
 135  0
     public void declareBean(BSFDeclaredBean bean) throws BSFException {
 136   
         //System.out.println("Declaring bean: " + bean.name + " value: " + bean.bean);
 137  0
         shell.setVariable(bean.name, bean.bean);
 138   
     }
 139   
 
 140   
     /**
 141   
      * Evaluate an expression.
 142   
      */
 143  0
     public Object eval(String source, int lineNo, int columnNo, Object script) throws BSFException {
 144  0
         try {
 145  0
             source = convertToValidJavaClassname(source);
 146  0
             Object result = getEvalShell().evaluate(script.toString(), source);
 147  0
             return result;
 148   
         }
 149   
         catch (Exception e) {
 150  0
             e.printStackTrace();
 151  0
             throw new BSFException(BSFException.REASON_EXECUTION_ERROR, "exception from Groovy: " + e, e);
 152   
         }
 153   
     }
 154   
 
 155   
     /**
 156   
      * Execute a script. 
 157   
      */
 158  0
     public void exec(String source, int lineNo, int columnNo, Object script) throws BSFException {
 159  0
         try {
 160   
             // use evaluate to pass in the BSF variables
 161  0
             source = convertToValidJavaClassname(source);
 162  0
             getEvalShell().evaluate(script.toString(), source);
 163   
             //getEvalShell().run(script.toString(), source, EMPTY_ARGS);
 164   
         }
 165   
         catch (Exception e) {
 166  0
             e.printStackTrace();
 167  0
             throw new BSFException(BSFException.REASON_EXECUTION_ERROR, "exception from Groovy: " + e, e);
 168   
         }
 169   
     }
 170   
 
 171   
     /**
 172   
      * Initialize the engine.
 173   
      */
 174  0
     public void initialize(BSFManager mgr, String lang, Vector declaredBeans) throws BSFException {
 175  0
         super.initialize(mgr, lang, declaredBeans);
 176   
 
 177   
         // create a shell
 178  0
         shell = new GroovyShell(mgr.getClassLoader());
 179   
 
 180   
         // register the mgr with object name "bsf"
 181  0
         shell.setVariable("bsf", new BSFFunctions(mgr, this));
 182   
 
 183  0
         int size = declaredBeans.size();
 184  0
         for (int i = 0; i < size; i++) {
 185  0
             declareBean((BSFDeclaredBean) declaredBeans.elementAt(i));
 186   
         }
 187   
     }
 188   
 
 189   
     /**
 190   
      * Undeclare a previously declared bean.
 191   
      */
 192  0
     public void undeclareBean(BSFDeclaredBean bean) throws BSFException {
 193  0
         shell.setVariable(bean.name, null);
 194   
     }
 195   
 
 196   
     /**
 197   
      * @return a newly created GroovyShell using the same variable scope but a new class loader
 198   
      */
 199  0
     protected GroovyShell getEvalShell() {
 200  0
         return new GroovyShell(shell);
 201   
     }
 202   
 }
 203