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.aries.blueprint.compendium.cm;
  
  import java.util.Arrays;
  import java.util.Dictionary;
  import java.util.Enumeration;
  import java.util.Properties;
  
  import org.apache.aries.blueprint.ext.PropertyPlaceholderExt;
  import org.apache.aries.blueprint.services.ExtendedBlueprintContainer;
  import org.osgi.framework.Bundle;
  import org.osgi.framework.Constants;
  import org.osgi.service.cm.ConfigurationAdmin;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * TODO: javadoc
   *
   * @version $Rev$, $Date$
   */
  public class CmPropertyPlaceholder extends PropertyPlaceholderExt implements ManagedObject {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(CmPropertyPlaceholder.class);
  
      private ExtendedBlueprintContainer blueprintContainer;
      private ConfigurationAdmin configAdmin;
      private String persistentId;
      private String updateStrategy;
      private ManagedObjectManager managedObjectManager;
      private Dictionary<String, Object> properties;
      private boolean initialized;
  
      public ExtendedBlueprintContainer getBlueprintContainer() {
          return blueprintContainer;
      }
  
      public void setBlueprintContainer(ExtendedBlueprintContainer blueprintContainer) {
          this.blueprintContainer = blueprintContainer;
      }
  
      public ConfigurationAdmin getConfigAdmin() {
          return configAdmin;
      }
  
      public void setConfigAdmin(ConfigurationAdmin configAdmin) {
          this.configAdmin = configAdmin;
      }
  
      public String getPersistentId() {
          return persistentId;
      }
  
      public void setPersistentId(String persistentId) {
          this.persistentId = persistentId;
      }
  
      public String getUpdateStrategy() {
          return updateStrategy;
      }
  
      public void setUpdateStrategy(String updateStrategy) {
          this.updateStrategy = updateStrategy;
      }
  
      public ManagedObjectManager getManagedObjectManager() {
          return managedObjectManager;
      }
  
      public void setManagedObjectManager(ManagedObjectManager managedObjectManager) {
          this.managedObjectManager = managedObjectManager;
      }
  
      public void init() throws Exception {
          LOGGER.debug("Initializing CmPropertyPlaceholder");
          Properties props = new Properties();
          props.put(Constants.SERVICE_PID, persistentId);
          Bundle bundle = blueprintContainer.getBundleContext().getBundle();
          props.put(Constants.BUNDLE_SYMBOLICNAME, bundle.getSymbolicName());
          props.put(Constants.BUNDLE_VERSION, bundle.getHeaders().get(Constants.BUNDLE_VERSION));
          managedObjectManager.register(this, props);
      }
  
      public void destroy() {
          LOGGER.debug("Destroying CmPropertyPlaceholder");
          managedObjectManager.unregister(this);
      }
  
      protected Object getProperty(String val) {
          LOGGER.debug("Retrieving property value {} from configuration with pid {}", val, persistentId);
          Object v = null;
          if (properties != null) {
              v = properties.get(val);
              if (v != null) {
                  LOGGER.debug("Found property value {}", v);
              } else {
                  LOGGER.debug("Property not found in configuration");
              }
          }
          if (v == null) {
              v = super.getProperty(val);
          }
          return v;
      }
  
      public Bundle getBundle() {
          return blueprintContainer.getBundleContext().getBundle();
      }
  
      public void updated(Dictionary props) {
          if (!initialized) {
              properties = props;
              initialized = true;
              return;
          }
          if ("reload".equalsIgnoreCase(updateStrategy) && !equals(properties, props)) {
              LOGGER.debug("Configuration updated for pid={}", persistentId);
              // Run in a separate thread to avoid re-entrance
              new Thread() {
                  public void run() {
                      blueprintContainer.reload();
                  }
              }.start();
          }
      }
  
      private <T, U> boolean equals(Dictionary<T, U> d1, Dictionary<T, U> d2) {
          if (d1 == null || d1.isEmpty()) {
              return d2 == null || d2.isEmpty();
          } else if (d2 == null || d1.size() != d2.size()) {
              return false;
          } else {
              for (Enumeration<T> e = d1.keys(); e.hasMoreElements();) {
                  T k = e.nextElement();
                  U v1 = d1.get(k);
                  U v2 = d2.get(k);
                  if (v1 == null) {
                      if (v2 != null) {
                          return false;
                      }
                  } else if (v1 instanceof Object[] && v2 instanceof Object[]) {
                      if (!Arrays.deepEquals((Object[]) v1, (Object[]) v2)) {
                          return false;
                      }
                  } else if (!v1.equals(v2)) {
                      return false;
                  }
              }
              return true;
          }
      }
  
  }
  