Clover coverage report - Ant Coverage
Coverage timestamp: Tue Apr 8 2003 20:43:55 EST
file stats: LOC: 146   Methods: 4
NCLOC: 45   Classes: 2
 
 Source file Conditionals Statements Methods TOTAL
WeakishReference.java 75% 73.3% 50% 69.6%
 1   
 /*
 2   
  *  The Apache Software License, Version 1.1
 3   
  *
 4   
  *  Copyright (c) 2002 The Apache Software Foundation.  All rights
 5   
  *  reserved.
 6   
  *
 7   
  *  Redistribution and use in source and binary forms, with or without
 8   
  *  modification, are permitted provided that the following conditions
 9   
  *  are met:
 10   
  *
 11   
  *  1. Redistributions of source code must retain the above copyright
 12   
  *  notice, this list of conditions and the following disclaimer.
 13   
  *
 14   
  *  2. Redistributions in binary form must reproduce the above copyright
 15   
  *  notice, this list of conditions and the following disclaimer in
 16   
  *  the documentation and/or other materials provided with the
 17   
  *  distribution.
 18   
  *
 19   
  *  3. The end-user documentation included with the redistribution, if
 20   
  *  any, must include the following acknowlegement:
 21   
  *  "This product includes software developed by the
 22   
  *  Apache Software Foundation (http://www.apache.org/)."
 23   
  *  Alternately, this acknowlegement may appear in the software itself,
 24   
  *  if and wherever such third-party acknowlegements normally appear.
 25   
  *
 26   
  *  4. The names "Ant" and "Apache Software
 27   
  *  Foundation" must not be used to endorse or promote products derived
 28   
  *  from this software without prior written permission. For written
 29   
  *  permission, please contact apache@apache.org.
 30   
  *
 31   
  *  5. Products derived from this software may not be called "Apache"
 32   
  *  nor may "Apache" appear in their names without prior written
 33   
  *  permission of the Apache Group.
 34   
  *
 35   
  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 36   
  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 37   
  *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 38   
  *  DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 39   
  *  ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 40   
  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 41   
  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 42   
  *  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 43   
  *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 44   
  *  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 45   
  *  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 46   
  *  SUCH DAMAGE.
 47   
  *  ====================================================================
 48   
  *
 49   
  *  This software consists of voluntary contributions made by many
 50   
  *  individuals on behalf of the Apache Software Foundation.  For more
 51   
  *  information on the Apache Software Foundation, please see
 52   
  *  <http://www.apache.org/>.
 53   
  */
 54   
 
 55   
 package org.apache.tools.ant.util;
 56   
 
 57   
 import org.apache.tools.ant.BuildException;
 58   
 
 59   
 import java.lang.reflect.Constructor;
 60   
 import java.lang.reflect.InvocationTargetException;
 61   
 
 62   
 
 63   
 /**
 64   
  * this is a weak reference on java1.2 and up, a hard
 65   
  * reference on java1.1
 66   
  * @since ant1.6
 67   
  */
 68   
 public abstract class WeakishReference  {
 69   
 
 70   
     private static Constructor referenceConstructor;
 71   
 
 72   
     private final static String WEAK_REFERENCE_NAME= "org.apache.tools.ant.util.optional.WeakishReference12";
 73   
 
 74   
     /**
 75   
      * create the appropriate type of reference for the java version
 76   
      * @param object
 77   
      * @return
 78   
      */
 79  3078
     public static WeakishReference createReference(Object object) {
 80  3078
         if(referenceConstructor==null) {
 81  1
             createReferenceConstructor();
 82   
         }
 83  3078
         try {
 84  3078
             return (WeakishReference)referenceConstructor
 85   
                         .newInstance(new Object[]{object});
 86   
         } catch (Exception e) {
 87  0
             throw new BuildException("while creating a weakish reference",e);
 88   
         }
 89   
     }
 90   
 
 91   
     /**
 92   
      * create the appropriate constructor method for the
 93   
      */
 94  1
     private static void createReferenceConstructor() {
 95  1
         Class[] ctor=new Class[]{Object.class};
 96  1
         try {
 97  1
             referenceConstructor=HardReference.class.getConstructor(ctor);
 98   
         } catch (NoSuchMethodException e) {
 99   
             //deep trouble here
 100  0
             throw new BuildException("when creating a Hard Reference constructor",e);
 101   
         }
 102  1
         if (!JavaEnvUtils.isJavaVersion(JavaEnvUtils.JAVA_1_1)) {
 103   
             //create a weak ref constructor. If this fails we have that hard one anyway
 104  1
             try {
 105  1
                 Class clazz=Class.forName(WEAK_REFERENCE_NAME);
 106  1
                 referenceConstructor=clazz.getConstructor(ctor);
 107   
             } catch (ClassNotFoundException e) {
 108   
             } catch (NoSuchMethodException e) {
 109   
             }
 110   
         }
 111   
     }
 112   
 
 113   
 
 114   
     /**
 115   
      * Returns this reference object's referent.  If this reference object has
 116   
      * been cleared, then this method returns <code>null</code>.
 117   
      *
 118   
      * @return     The object to which this reference refers, or
 119   
      *         <code>null</code> if this reference object has been cleared
 120   
      */
 121   
     public abstract Object get();
 122   
 
 123   
     /**
 124   
      * A hard reference for Java 1.1
 125   
      */
 126   
     public static class HardReference extends WeakishReference {
 127   
         private Object object;
 128   
 
 129   
         /**
 130   
          * construct
 131   
          * @param object
 132   
          */
 133  0
         public HardReference(Object object) {
 134  0
             this.object = object;
 135   
         }
 136   
 
 137   
         /**
 138   
          * Returns this reference object's referent.
 139   
          */
 140  0
         public Object get() {
 141  0
             return object;
 142   
         }
 143   
     }
 144   
 
 145   
 }
 146