/* ***************************************************************************
    * 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.UnsupportedEncodingException;
  
  import org.settings4j.ContentResolver;
  import org.settings4j.contentresolver.ClasspathContentResolver;
  import org.settings4j.contentresolver.UnionContentResolver;
  
  /**
   * Connector implementation to read Settings from the Classpath.
   * <p>
   * Default Charset "UTF-8" is used to read the content from Classpath.
   * 
   * 
   * @author Harald.Brabenetz
   *
   */
  public class ClasspathConnector extends AbstractConnector {
  
      /** General Logger for this Class. */
      private static final org.slf4j.Logger LOG = org.slf4j.LoggerFactory.getLogger(ClasspathConnector.class);
  
      private final ClasspathContentResolver classpathContentResolver = new ClasspathContentResolver();
      private ContentResolver unionContentResolver = new UnionContentResolver(this.classpathContentResolver);
      private String charset = "UTF-8";
  
      /** {@inheritDoc} */
      public byte[] getContent(final String key) {
          return this.classpathContentResolver.getContent(key);
      }
  
      /** {@inheritDoc} */
      public Object getObject(final String key) {
          if (getObjectResolver() != null) {
              return getObjectResolver().getObject(key, this.unionContentResolver);
          }
          // else
          return null;
          
      }
  
      /** {@inheritDoc} */
      public String getString(final String key) {
          try {
              final byte[] content = getContent(key);
              if (content != null) {
                  return new String(this.classpathContentResolver.getContent(key), this.charset);
              }
              // else
              return null;
              
          } catch (final UnsupportedEncodingException e) {
              // should never occure with "UTF-8"
              LOG.error("Charset not found: " + this.charset, e);
              return null;
          }
      }
  
      public String getCharset() {
          return this.charset;
      }
  
      public void setCharset(final String charset) {
          this.charset = charset;
      }
  
      /** {@inheritDoc} */
      @Override
      public void setContentResolver(final ContentResolver contentResolver) {
          this.unionContentResolver = new UnionContentResolver(this.classpathContentResolver);
          this.unionContentResolver.addContentResolver(contentResolver);
      }
  }