/**
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *     http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   */
  package javax.xml.bind;
  
  import java.lang.reflect.Method;
  import java.util.Map;
  import java.util.Properties;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.BufferedReader;
  import java.io.InputStreamReader;
  
  class ContextFinder {
  
      private static final String PLATFORM_DEFAULT_FACTORY_CLASS = "com.sun.xml.bind.v2.ContextFactory";
      private static final String JAXB_CONTEXT_PROPERTY = JAXBContext.class.getName();
      private static final String JAXB_CONTEXT_FACTORY = JAXBContext.JAXB_CONTEXT_FACTORY;
  
      public static JAXBContext find(String contextPath, ClassLoader classLoader, Map properties) throws JAXBException {
          contextPath = contextPath.trim();
          if (contextPath.length() == 0 || contextPath.equals(":")) {
              throw new JAXBException("Invalid contextPath");
          }
          String className = null;
          String[] packages = contextPath.split("[:]");
          for (String pkg : packages) {
              String url = pkg.replace('.', '/') + "/jaxb.properties";
              className = loadClassNameFromProperties(url, classLoader);
              if (className != null) {
                  break;
              }
          }
          if (className == null) {
              className = System.getProperty(JAXB_CONTEXT_PROPERTY);
          }
          if (className == null) {
              String url = "META-INF/services/" + JAXB_CONTEXT_PROPERTY;
              className = loadClassName(url, classLoader);
          }
          if (className == null) {
              className = PLATFORM_DEFAULT_FACTORY_CLASS;
          }
          Class spi = loadSpi(className, classLoader);
          try {
              Method m = spi.getMethod("createContext", new Class[] { String.class, ClassLoader.class, Map.class });
              return (JAXBContext) m.invoke(null, new Object[] { contextPath, classLoader, properties });
          } catch (NoSuchMethodException e) {
              // will try JAXB 1.0 compatible createContext() method
          } catch (Throwable t) {
              throw new JAXBException("Unable to create context", t);
          }
  
          // try old JAXB 1.0 compatible createContext() method
          try {
              Method m = spi.getMethod("createContext", new Class[] { String.class, ClassLoader.class });
              return (JAXBContext) m.invoke(null, new Object[] { contextPath, classLoader });
          } catch (Throwable t) {
              throw new JAXBException("Unable to create context", t);
          }
      }
  
  
      public static JAXBContext find(Class[] classes, Map properties) throws JAXBException {
          String className = null;
          for (Class cl : classes) {
              Package pkg = cl.getPackage();
              if (pkg != null) {
                  String url = pkg.getName().replace('.', '/') + "/jaxb.properties";
                  className = loadClassNameFromProperties(url, cl.getClassLoader());
                  if (className != null) {
                      break;
                  }
              }
          }
          if (className == null) {
              className = System.getProperty(JAXB_CONTEXT_PROPERTY);
          }
          if (className == null) {
              String url = "META-INF/services/" + JAXB_CONTEXT_PROPERTY;
              className = loadClassName(url, Thread.currentThread().getContextClassLoader());
          }
          if (className == null) {
              className = PLATFORM_DEFAULT_FACTORY_CLASS;
          }
          Class spi = loadSpi(className, Thread.currentThread().getContextClassLoader());
         try {
             Method m = spi.getMethod("createContext", new Class[] { Class[].class, Map.class });
             return (JAXBContext) m.invoke(null, new Object[] { classes, properties });
         } catch (Throwable t) {
             throw new JAXBException("Unable to create context", t);
         }
     }
 
     private static String loadClassNameFromProperties(String url, ClassLoader classLoader) throws JAXBException {
         try {
             InputStream is;
             if (classLoader != null) {
                 is = classLoader.getResourceAsStream(url);
             } else {
                 is = ClassLoader.getSystemResourceAsStream(url);
             }
             if (is != null) {
                 try {
                     Properties props = new Properties();
                     props.load(is);
                     String className = props.getProperty(JAXB_CONTEXT_FACTORY);
                     if (className == null) {
                         throw new JAXBException("jaxb.properties file " + url + " should contain a " + JAXB_CONTEXT_FACTORY + " property");
                     }
                     return className.trim();
                 } finally {
                     is.close();
                 }
             } else {
                 return null;
             }
         } catch (IOException e) {
             throw new JAXBException(e);
         }
     }
 
     private static String loadClassName(String url, ClassLoader classLoader) throws JAXBException {
         try {
             InputStream is;
             if (classLoader != null) {
                 is = classLoader.getResourceAsStream(url);
             } else {
                 is = ClassLoader.getSystemResourceAsStream(url);
             }
             if (is != null) {
                 try {
                     BufferedReader r = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                     return r.readLine().trim();
                 } finally {
                     is.close();
                 }
             }
             return null;
         } catch (IOException e) {
             throw new JAXBException(e);
         }
     }
 
     private static Class loadSpi(String className, ClassLoader classLoader) throws JAXBException {
         Class spiClass;
         try {
             if (classLoader != null) {
                 spiClass = classLoader.loadClass(className);
             } else {
                 spiClass = Class.forName(className);
             }
         } catch (ClassNotFoundException e) {
             throw new JAXBException("Provider " + className + " not found", e);
         }
         return spiClass;
     }
 
 
 }