/*
    * #%L
    * settings4j
    * ===============================================================
    * Copyright (C) 2008 - 2015 Brabenetz Harald, Austria
    * ===============================================================
    * Licensed 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.
   * #L%
   */
  package org.settings4j.connector;
  
  import org.apache.commons.lang3.Validate;
  import org.settings4j.Connector;
  import org.settings4j.ContentResolver;
  import org.settings4j.Filter;
  import org.settings4j.ObjectResolver;
  
  /**
   * Wrapper to add a {@link Filter} which is used before the given {@link Connector} is called.
   *
   * @author Harald.Brabenetz
   */
  public class FilteredConnectorWrapper implements Connector {
  
      private final Connector targetConnector;
      private final Filter filter;
  
      /**
       * @param targetConnector The Connect where the settings should be read if the Filter allows it.
       * @param filter the {@link Filter} which defines if an key should be read from the given Connector.
       */
      public FilteredConnectorWrapper(final Connector targetConnector, final Filter filter) {
          super();
          Validate.notNull(targetConnector, "FilteredConnectorWrapper needs a Connector Object");
          Validate.notNull(filter, "FilteredConnectorWrapper needs a Filter Object");
          this.targetConnector = targetConnector;
          this.filter = filter;
      }
  
      @Override
      public void addConnector(final Connector connector) {
          this.targetConnector.addConnector(connector);
      }
  
      @Override
      public byte[] getContent(final String key) {
          if (!this.filter.isValid(key)) {
              return null;
          }
          return this.targetConnector.getContent(key);
      }
  
      @Override
      public String getName() {
          return this.targetConnector.getName();
      }
  
      @Override
      public Object getObject(final String key) {
          if (!this.filter.isValid(key)) {
              return null;
          }
          return this.targetConnector.getObject(key);
      }
  
      @Override
      public String getString(final String key) {
          if (!this.filter.isValid(key)) {
              return null;
          }
          return this.targetConnector.getString(key);
      }
  
      @Override
      public void init() {
          this.targetConnector.init();
      }
  
      @Override
      public void setContentResolver(final ContentResolver contentResolver) {
          this.targetConnector.setContentResolver(contentResolver);
      }
  
      @Override
      public void setName(final String name) {
          this.targetConnector.setName(name);
      }
  
      @Override
     public void setObjectResolver(final ObjectResolver objectResolver) {
         this.targetConnector.setObjectResolver(objectResolver);
     }
 
 
 }