Coverage report

  %line %branch
org.apache.commons.jexl.util.introspection.Introspector
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 1  
 /*
 2  
  * Copyright 2001-2006 The Apache Software Foundation.
 3  
  *
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  * Licensed under the Apache License, Version 2.0 (the "License");
 5  
  * you may not use this file except in compliance with the License.
 6  
  * You may obtain a copy of the License at
 7  
  *
 8  
  *      http://www.apache.org/licenses/LICENSE-2.0
 9  
  *
 10  
  * Unless required by applicable law or agreed to in writing, software
 11  
  * distributed under the License is distributed on an "AS IS" BASIS,
 12  
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 13  
  * See the License for the specific language governing permissions and
 14  
  * limitations under the License.
 15  
  */
 16  
 
 17  
 package org.apache.commons.jexl.util.introspection;
 18  
 
 19  
 import java.lang.reflect.Method;
 20  
 
 21  
 import org.apache.commons.logging.Log;
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 23  
 
 24  
 /**
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  * This basic function of this class is to return a Method
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  * object for a particular class given the name of a method
 27  
  * and the parameters to the method in the form of an Object[]
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  *
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  * The first time the Introspector sees a 
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  * class it creates a class method map for the
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  * class in question. Basically the class method map
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  * is a Hashtable where Method objects are keyed by a
 33  
  * concatenation of the method name and the names of
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  * classes that make up the parameters.
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  *
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  * For example, a method with the following signature:
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  *
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  * public void method(String a, StringBuffer b)
 39  
  *
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  * would be mapped by the key:
 41  
  *
 42  
  * "method" + "java.lang.String" + "java.lang.StringBuffer"
 43  
  *
 44  
  * This mapping is performed for all the methods in a class
 45  
  * and stored for 
 46  
  * @since 1.0
 47  
  * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
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  * @author <a href="mailto:bob@werken.com">Bob McWhirter</a>
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  * @author <a href="mailto:szegedia@freemail.hu">Attila Szegedi</a>
 50  
  * @author <a href="mailto:paulo.gaspar@krankikom.de">Paulo Gaspar</a>
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  * @version $Id: Introspector.java 398171 2006-04-29 14:57:29Z dion $
 52  
  */
 53  
 public class Introspector extends IntrospectorBase {
 54  
     /**
 55  
      *  define a public string so that it can be looked for
 56  
      *  if interested.
 57  
      */
 58  
 
 59  
     public static final String CACHEDUMP_MSG = 
 60  
         "Introspector : detected classloader change. Dumping cache.";
 61  
 
 62  
     /**
 63  
      *  our engine runtime services.
 64  
      */
 65  
     private final Log rlog;
 66  
 
 67  
     /**
 68  
      *  Recieves our RuntimeServices object.
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      *  @param logger a {@link Log}.
 70  
      */
 71  4
     public Introspector(Log logger) {
 72  4
         this.rlog = logger;
 73  4
     }
 74  
    
 75  
     /**
 76  
      * Gets the method defined by <code>name</code> and
 77  
      * <code>params</code> for the Class <code>c</code>.
 78  
      *
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      * @param c Class in which the method search is taking place
 80  
      * @param name Name of the method being searched for
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      * @param params An array of Objects (not Classes) that describe the
 82  
      *               the parameters
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      *
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      * @return The desired Method object.
 85  
      * @throws Exception if the superclass does.
 86  
      */
 87  
     public Method getMethod(Class c, String name, Object[] params) throws Exception {
 88  
         /*
 89  
          *  just delegate to the base class
 90  
          */
 91  
 
 92  
         try {
 93  98
             return super.getMethod(c, name, params);
 94  
         } catch (MethodMap.AmbiguousException ae) {
 95  
             /*
 96  
              *  whoops.  Ambiguous.  Make a nice log message and return null...
 97  
              */
 98  
 
 99  0
             StringBuffer msg = new StringBuffer("Introspection Error : Ambiguous method invocation ")
 100  
                 .append(name).append("( ");
 101  
 
 102  0
             for (int i = 0; i < params.length; i++) {
 103  0
                 if (i > 0) {
 104  0
                     msg.append(", ");
 105  
                 }
 106  
                 
 107  0
                 msg.append(params[i].getClass().getName());
 108  
             }
 109  
             
 110  0
             msg.append(") for class ").append(c.getName());
 111  
             
 112  0
             rlog.error(msg.toString());
 113  
         }
 114  
 
 115  0
         return null;
 116  
     }
 117  
 
 118  
     /**
 119  
      * Clears the classmap and classname
 120  
      * caches, and logs that we did so.
 121  
      */
 122  
     protected void clearCache() {
 123  0
         super.clearCache();
 124  0
         rlog.info(CACHEDUMP_MSG);
 125  0
     }
 126  
 }

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