Coverage Report - org.apache.turbine.services.assemblerbroker.util.java.JavaBaseFactory
 
Classes in this File Line Coverage Branch Coverage Complexity
JavaBaseFactory
66%
24/36
83%
5/6
3,667
 
 1  
 package org.apache.turbine.services.assemblerbroker.util.java;
 2  
 
 3  
 
 4  
 /*
 5  
  * Licensed to the Apache Software Foundation (ASF) under one
 6  
  * or more contributor license agreements.  See the NOTICE file
 7  
  * distributed with this work for additional information
 8  
  * regarding copyright ownership.  The ASF licenses this file
 9  
  * to you under the Apache License, Version 2.0 (the
 10  
  * "License"); you may not use this file except in compliance
 11  
  * with the License.  You may obtain a copy of the License at
 12  
  *
 13  
  *   http://www.apache.org/licenses/LICENSE-2.0
 14  
  *
 15  
  * Unless required by applicable law or agreed to in writing,
 16  
  * software distributed under the License is distributed on an
 17  
  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 18  
  * KIND, either express or implied.  See the License for the
 19  
  * specific language governing permissions and limitations
 20  
  * under the License.
 21  
  */
 22  
 
 23  
 import java.util.Collections;
 24  
 import java.util.HashMap;
 25  
 import java.util.List;
 26  
 import java.util.Map;
 27  
 
 28  
 import org.apache.commons.lang.StringUtils;
 29  
 import org.apache.commons.logging.Log;
 30  
 import org.apache.commons.logging.LogFactory;
 31  
 import org.apache.turbine.modules.Assembler;
 32  
 import org.apache.turbine.modules.GenericLoader;
 33  
 import org.apache.turbine.modules.Loader;
 34  
 import org.apache.turbine.services.assemblerbroker.util.AssemblerFactory;
 35  
 
 36  
 /**
 37  
  * A screen factory that attempts to load a java class from
 38  
  * the module packages defined in the TurbineResource.properties.
 39  
  *
 40  
  * @author <a href="mailto:leon@opticode.co.za">Leon Messerschmidt</a>
 41  
  * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
 42  
  * @version $Id: JavaBaseFactory.java 1078552 2011-03-06 19:58:46Z tv $
 43  
  */
 44  564
 public abstract class JavaBaseFactory<T extends Assembler>
 45  
     implements AssemblerFactory<T>
 46  
 {
 47  
     /** A vector of packages. */
 48  58
     private static List<String> packages = GenericLoader.getPackages();
 49  
 
 50  
     /** Logging */
 51  564
     protected Log log = LogFactory.getLog(this.getClass());
 52  
 
 53  
     /**
 54  
      * A cache for previously obtained Class instances, which we keep in order
 55  
      * to reduce the Class.forName() overhead (which can be sizable).
 56  
      */
 57  564
     private final Map<String, Class<T>> classCache =
 58  
             Collections.synchronizedMap(new HashMap<String, Class<T>>());
 59  
 
 60  
     /**
 61  
      * Get an Assembler.
 62  
      *
 63  
      * @param packageName java package name
 64  
      * @param name name of the requested Assembler
 65  
      * @return an Assembler
 66  
      */
 67  
     @SuppressWarnings("unchecked")
 68  
     public T getAssembler(String packageName, String name)
 69  
     {
 70  212
         T assembler = null;
 71  
 
 72  212
         log.debug("Class Fragment is " + name);
 73  
 
 74  212
         if (StringUtils.isNotEmpty(name))
 75  
         {
 76  212
             for (String p : packages)
 77  
             {
 78  374
                 StringBuffer sb = new StringBuffer();
 79  
 
 80  374
                 sb.append(p).append('.').append(packageName).append('.').append(name);
 81  
 
 82  374
                 String className = sb.toString();
 83  
 
 84  374
                 log.debug("Trying " + className);
 85  
 
 86  
                 try
 87  
                 {
 88  374
                     Class<T> servClass = classCache.get(className);
 89  374
                     if(servClass == null)
 90  
                     {
 91  350
                         servClass = (Class<T>) Class.forName(className.toString());
 92  62
                         classCache.put(className, servClass);
 93  
                     }
 94  86
                     assembler = servClass.newInstance();
 95  86
                     break; // for()
 96  
                 }
 97  288
                 catch (ClassNotFoundException cnfe)
 98  
                 {
 99  
                     // Do this so we loop through all the packages.
 100  288
                     log.debug(className + ": Not found");
 101  
                 }
 102  0
                 catch (NoClassDefFoundError ncdfe)
 103  
                 {
 104  
                     // Do this so we loop through all the packages.
 105  0
                     log.debug(className + ": No Class Definition found");
 106  
                 }
 107  0
                 catch (ClassCastException cce)
 108  
                 {
 109  
                     // This means trouble!
 110  
                     // Alternatively we can throw this exception so
 111  
                     // that it will appear on the client browser
 112  0
                     log.error("Could not load "+className, cce);
 113  0
                     break; // for()
 114  
                 }
 115  0
                 catch (InstantiationException ine)
 116  
                 {
 117  
                     // This means trouble!
 118  
                     // Alternatively we can throw this exception so
 119  
                     // that it will appear on the client browser
 120  0
                     log.error("Could not load "+className, ine);
 121  0
                     break; // for()
 122  
                 }
 123  0
                 catch (IllegalAccessException ilae)
 124  
                 {
 125  
                     // This means trouble!
 126  
                     // Alternatively we can throw this exception so
 127  
                     // that it will appear on the client browser
 128  0
                     log.error("Could not load "+className, ilae);
 129  0
                     break; // for()
 130  288
                 }
 131  
                 // With ClassCastException, InstantiationException we hit big problems
 132  288
             }
 133  
         }
 134  212
         log.debug("Returning: " + assembler);
 135  
 
 136  212
         return assembler;
 137  
     }
 138  
 
 139  
     /**
 140  
      * Get the loader for this type of assembler
 141  
      *
 142  
      * @return a Loader
 143  
      */
 144  
     public abstract Loader<T> getLoader();
 145  
 
 146  
     /**
 147  
      * Get the size of a possibly configured cache
 148  
      *
 149  
      * @return the size of the cache in bytes
 150  
      */
 151  
     public int getCacheSize()
 152  
     {
 153  0
         return getLoader().getCacheSize();
 154  
     }
 155  
 }