/* ***************************************************************************
    * Copyright (c) 2008 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.
   * 
   *****************************************************************************/
  package org.settings4j.connector;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.UnsupportedEncodingException;
  
  import org.settings4j.ContentResolver;
  import org.settings4j.contentresolver.FSContentResolver;
  import org.settings4j.contentresolver.UnionContentResolver;
  
  /**
   * The FileSystem implementation of an {@link org.settings4j.Connector}.
   * <p>
   * 
   * @author Harald.Brabenetz
   */
  public class FSConnector extends AbstractConnector {
  
      /** General Logger for this Class. */
      private static final org.slf4j.Logger LOG = org.slf4j.LoggerFactory.getLogger(FSConnector.class);
  
      private final FSContentResolver fsContentResolver = new FSContentResolver();
      private ContentResolver unionContentResolver = new UnionContentResolver(fsContentResolver);
      private String charset = "UTF-8";
  
      /** {@inheritDoc} */
      public byte[] getContent(final String key) {
          return fsContentResolver.getContent(key);
      }
  
      /** {@inheritDoc} */
      public Object getObject(final String key) {
          if (getObjectResolver() != null) {
              return getObjectResolver().getObject(key, unionContentResolver);
          }
          // else
          return null;
      }
  
      /** {@inheritDoc} */
      public String getString(final String key) {
          try {
              final byte[] content = getContent(key);
              if (content != null) {
                  return new String(fsContentResolver.getContent(key), charset);
              }
              // else
              return null;
  
          } catch (final UnsupportedEncodingException e) {
              // should never occure with "UTF-8"
              LOG.error("Charset not found: " + charset, e);
              return null;
          }
      }
  
      /**
       * @param key The Settings4j Key.
       * @param value The value to Store.
       * @throws IOException if an error occured.
       */
      public void setContent(final String key, final byte[] value) throws IOException {
          fsContentResolver.setContent(key, value);
      }
  
      /**
       * @param key The Settings4j Key.
       * @param value The value to Store.
       * @throws IOException if an error occured.
       */
      public void setString(final String key, final String value) throws IOException {
          try {
              setContent(key, value.getBytes(charset));
          } catch (final UnsupportedEncodingException e) {
              // should never occure with "UTF-8"
              LOG.error("Charset not found: " + charset, e);
          }
      }
  
      public String getCharset() {
          return charset;
      }
  
     public void setCharset(final String charset) {
         this.charset = charset;
     }
 
     /**
      * Delegate the rootFolderPath to the {@link FSContentResolver#setRootFolderPath(String)}.
      * 
      * @param rootFolderPath The root Folder Path where the settings could be stored.
      */
     public void setRootFolderPath(final String rootFolderPath) {
         fsContentResolver.setRootFolderPath(rootFolderPath);
     }
 
     /** {@inheritDoc} */
     @Override
     public void setContentResolver(final ContentResolver contentResolver) {
         unionContentResolver = new UnionContentResolver(fsContentResolver);
         unionContentResolver.addContentResolver(contentResolver);
     }
 
     /**
      * return the root of this FileSystem ContenResolver.
      * <p>
      * if no one is set, the "." will be returned.
      * 
      * @return the root of this FileSystem ContenResolver.
      */
     public File getRootFolder() {
         return fsContentResolver.getRootFolder();
     }
 }