Coverage Report - org.apache.camel.util.FactoryFinder
 
Classes in this File Line Coverage Branch Coverage Complexity
FactoryFinder
69% 
89% 
0
 
 1  
 /**
 2  
  * Licensed to the Apache Software Foundation (ASF) under one or more
 3  
  * contributor license agreements.  See the NOTICE file distributed with
 4  
  * this work for additional information regarding copyright ownership.
 5  
  * The ASF licenses this file to You under the Apache License, Version 2.0
 6  
  * (the "License"); you may not use this file except in compliance with
 7  
  * the License.  You may obtain a copy of the License at
 8  
  *
 9  
  *      http://www.apache.org/licenses/LICENSE-2.0
 10  
  *
 11  
  * Unless required by applicable law or agreed to in writing, software
 12  
  * distributed under the License is distributed on an "AS IS" BASIS,
 13  
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 14  
  * See the License for the specific language governing permissions and
 15  
  * limitations under the License.
 16  
  */
 17  
 package org.apache.camel.util;
 18  
 
 19  
 import java.io.BufferedInputStream;
 20  
 import java.io.IOException;
 21  
 import java.io.InputStream;
 22  
 import java.util.ArrayList;
 23  
 import java.util.Collections;
 24  
 import java.util.List;
 25  
 import java.util.Properties;
 26  
 import java.util.concurrent.ConcurrentHashMap;
 27  
 
 28  
 import org.apache.camel.spi.Injector;
 29  
 
 30  
 public class FactoryFinder {
 31  
     private final String path;
 32  474
     private final ConcurrentHashMap classMap = new ConcurrentHashMap();
 33  
 
 34  
     public FactoryFinder() {
 35  465
         this("META-INF/services/org/apache/camel/");
 36  465
     }
 37  
 
 38  474
     public FactoryFinder(String path) {
 39  474
         this.path = path;
 40  474
     }
 41  
 
 42  
     /**
 43  
      * Creates a new instance of the given key
 44  
      * 
 45  
      * @param key is the key to add to the path to find a text file containing
 46  
      *                the factory name
 47  
      * @return a newly created instance
 48  
      */
 49  
     public Object newInstance(String key) throws IllegalAccessException, InstantiationException, IOException,
 50  
         ClassNotFoundException {
 51  324
         return newInstance(key, (String)null);
 52  
     }
 53  
 
 54  
     public Object newInstance(String key, String propertyPrefix) throws IllegalAccessException,
 55  
         InstantiationException, IOException, ClassNotFoundException {
 56  324
         Class clazz = findClass(key, propertyPrefix);
 57  0
         return clazz.newInstance();
 58  
     }
 59  
 
 60  
     public Object newInstance(String key, Injector injector) throws IOException, ClassNotFoundException {
 61  0
         return newInstance(key, injector, (String)null);
 62  
     }
 63  
 
 64  
     public Object newInstance(String key, Injector injector, String propertyPrefix) throws IOException,
 65  
         ClassNotFoundException {
 66  0
         Class type = findClass(key, propertyPrefix);
 67  0
         return injector.newInstance(type);
 68  
     }
 69  
 
 70  
     public <T> T newInstance(String key, Injector injector, Class<T> expectedType) throws IOException,
 71  
         ClassNotFoundException {
 72  0
         return newInstance(key, injector, null, expectedType);
 73  
     }
 74  
 
 75  
     public <T> T newInstance(String key, Injector injector, String propertyPrefix, Class<T> expectedType)
 76  
         throws IOException, ClassNotFoundException {
 77  0
         Class type = findClass(key, propertyPrefix);
 78  0
         Object value = injector.newInstance(type);
 79  0
         if (expectedType.isInstance(value)) {
 80  0
             return expectedType.cast(value);
 81  
         } else {
 82  0
             throw new ClassCastException("Not instanceof " + expectedType.getName() + " value: " + value);
 83  
         }
 84  
     }
 85  
 
 86  
     public <T> List<T> newInstances(String key, Injector injector, Class<T> type) throws IOException,
 87  
         ClassNotFoundException {
 88  141
         List<Class> list = findClasses(key);
 89  0
         List<T> answer = new ArrayList<T>(list.size());
 90  0
         answer.add(newInstance(key, injector, type));
 91  0
         return answer;
 92  
     }
 93  
 
 94  
     public Class findClass(String key) throws ClassNotFoundException, IOException {
 95  450
         return findClass(key, null);
 96  
     }
 97  
 
 98  
     public Class findClass(String key, String propertyPrefix) throws ClassNotFoundException, IOException {
 99  915
         if (propertyPrefix == null) {
 100  915
             propertyPrefix = "";
 101  
         }
 102  
 
 103  915
         Class clazz = (Class)classMap.get(propertyPrefix + key);
 104  915
         if (clazz == null) {
 105  498
             clazz = newInstance(doFindFactoryProperies(key), propertyPrefix);
 106  33
             classMap.put(propertyPrefix + key, clazz);
 107  
         }
 108  450
         return clazz;
 109  
     }
 110  
 
 111  
     public List<Class> findClasses(String key) throws ClassNotFoundException, IOException {
 112  141
         return findClasses(key, null);
 113  
     }
 114  
 
 115  
     public List<Class> findClasses(String key, String propertyPrefix) throws ClassNotFoundException,
 116  
         IOException {
 117  
         // TODO change to support finding multiple classes on the classpath!
 118  141
         Class type = findClass(key, propertyPrefix);
 119  0
         return Collections.singletonList(type);
 120  
     }
 121  
 
 122  
     private Class newInstance(Properties properties, String propertyPrefix) throws ClassNotFoundException,
 123  
         IOException {
 124  
 
 125  33
         String className = properties.getProperty(propertyPrefix + "class");
 126  33
         if (className == null) {
 127  0
             throw new IOException("Expected property is missing: " + propertyPrefix + "class");
 128  
         }
 129  33
         Class clazz = null;
 130  33
         ClassLoader loader = Thread.currentThread().getContextClassLoader();
 131  33
         if (loader != null) {
 132  
             try {
 133  33
                 clazz = loader.loadClass(className);
 134  0
             } catch (ClassNotFoundException e) {
 135  
                 // ignore
 136  33
             }
 137  
         }
 138  33
         if (clazz == null) {
 139  0
             clazz = FactoryFinder.class.getClassLoader().loadClass(className);
 140  
         }
 141  33
         return clazz;
 142  
     }
 143  
 
 144  
     private Properties doFindFactoryProperies(String key) throws IOException {
 145  498
         String uri = path + key;
 146  
 
 147  
         // lets try the thread context class loader first
 148  498
         ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
 149  498
         if (classLoader == null) {
 150  0
             classLoader = getClass().getClassLoader();
 151  
         }
 152  498
         InputStream in = classLoader.getResourceAsStream(uri);
 153  498
         if (in == null) {
 154  465
             in = FactoryFinder.class.getClassLoader().getResourceAsStream(uri);
 155  465
             if (in == null) {
 156  465
                 throw new NoFactoryAvailableException(uri);
 157  
             }
 158  
         }
 159  
 
 160  
         // lets load the file
 161  33
         BufferedInputStream reader = null;
 162  
         try {
 163  33
             reader = new BufferedInputStream(in);
 164  33
             Properties properties = new Properties();
 165  33
             properties.load(reader);
 166  33
             return properties;
 167  
         } finally {
 168  0
             try {
 169  33
                 reader.close();
 170  0
             } catch (Exception ignore) {
 171  33
             }
 172  33
         }
 173  
     }
 174  
 }