/*
    * This file is part of ***  M y C o R e  ***
    * See http://www.mycore.de/ for details.
    *
    * MyCoRe is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    *
   * MyCoRe is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with MyCoRe.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package org.mycore.common.content;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.UnsupportedEncodingException;
  
  import org.mycore.common.MCRConstants;
  
  /**
   * Reads MCRContent from a String's text.
   * 
   * @author Frank L\u00FCtzenkichen
   */
  public class MCRStringContent extends MCRContent {
  
      private String text;
  
      private byte[] bytes;
  
      /**
       * Reads content from the given string, 
       */
      public MCRStringContent(String text) {
          this.text = text;
          try {
              setEncoding(MCRConstants.DEFAULT_ENCODING);
          } catch (UnsupportedEncodingException e) {
              throw new RuntimeException(e);
          }
      }
  
      /** 
       * Sets the character encoding to use when transforming the text to a byte stream.
       * By default, this is {@link MCRConstants#DEFAULT_ENCODING}.
       */
      @Override
      public void setEncoding(String encoding) throws UnsupportedEncodingException {
          super.setEncoding(encoding);
          this.bytes = asByteArray();
      }
  
      @Override
      public InputStream getInputStream() throws IOException {
          return new ByteArrayInputStream(asByteArray());
      }
  
      @Override
      public byte[] asByteArray() throws UnsupportedEncodingException {
          return text.getBytes(encoding);
      }
  
      public String asString() {
          return text;
      }
  
      @Override
      public long length() throws IOException {
          return bytes.length;
      }
  
      @Override
      public long lastModified() throws IOException {
          return -1;
      }
  
      @Override
      public String getETag() throws IOException {
          String eTag = getSimpleWeakETag(getSystemId(), length(), lastModified());
          return eTag == null ? null : eTag.substring(2);
      }
  }