content: /**
   * 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 org.apache.activemq.broker;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.MalformedURLException;
  import java.net.URI;
  import java.net.URL;
  import java.util.Map;
  import java.util.Properties;
  
  import org.apache.activemq.util.IntrospectionSupport;
  
  /**
   * A {@link BrokerFactoryHandler} which uses a properties file to configure the
   * broker's various policies.
   *
   *
   */
  public class PropertiesBrokerFactory implements BrokerFactoryHandler {
  
      public BrokerService createBroker(URI brokerURI) throws Exception {
  
          Map<Object, Object> properties = loadProperties(brokerURI);
          BrokerService brokerService = createBrokerService(brokerURI, properties);
  
          IntrospectionSupport.setProperties(brokerService, properties);
          return brokerService;
      }
  
      /**
       * Lets load the properties from some external URL or a relative file
       */
      protected Map<Object, Object> loadProperties(URI brokerURI) throws IOException {
          // lets load a URI
          String remaining = brokerURI.getSchemeSpecificPart();
          Properties properties = new Properties();
          File file = new File(remaining);
  
          try (InputStream inputStream = loadStream(file, remaining)) {
              if (inputStream != null) {
                  properties.load(inputStream);
              }
          }
  
          // should we append any system properties?
          try {
              Properties systemProperties = System.getProperties();
              properties.putAll(systemProperties);
          } catch (Exception e) {
              // ignore security exception
          }
          return properties;
      }
  
      protected InputStream loadStream(File file, String remaining) throws IOException {
          InputStream inputStream = null;
          if (file != null && file.exists()) {
              inputStream = new FileInputStream(file);
          } else {
              URL url = null;
              try {
                  url = new URL(remaining);
              } catch (MalformedURLException e) {
                  // lets now see if we can find the name on the classpath
                  inputStream = findResourceOnClassPath(remaining);
                  if (inputStream == null) {
                      throw new IOException("File does not exist: " + remaining + ", could not be found on the classpath and is not a valid URL: " + e);
                  }
              }
              if (inputStream == null && url != null) {
                  inputStream = url.openStream();
              }
          }
          return inputStream;
      }
  
      protected InputStream findResourceOnClassPath(String remaining) {
          InputStream answer = Thread.currentThread().getContextClassLoader().getResourceAsStream(remaining);
          if (answer == null) {
              answer = getClass().getClassLoader().getResourceAsStream(remaining);
          }
          return answer;
      }
  
      protected BrokerService createBrokerService(URI brokerURI, Map<Object, Object> properties) {
          return new BrokerService();
      }
  }
  