/**
 * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */
package at.gv.egiz.pdfas.impl.api.commons;

import java.io.UnsupportedEncodingException;

import at.gv.egiz.pdfas.api.io.TextBased;
import at.gv.egiz.pdfas.impl.input.TextDataSourceImpl;

/**
 * Adapter that converts an API DataSource to a framework TextDataSource.
 * 
 * @author wprinz
 */
public class TextDataSourceAdapter extends TextDataSourceImpl
{
  /**
   * The API DataSource to be adapted to a framework TextDataSource.
   */
  protected at.gv.egiz.pdfas.api.io.DataSource apiDataSource = null;

  /**
   * Constructor.
   * 
   * @param apiDataSource
   *          The API DataSource to be adapted to a framework TextDataSource.
   * @throws UnsupportedEncodingException
   */
  public TextDataSourceAdapter(at.gv.egiz.pdfas.api.io.DataSource apiDataSource) throws UnsupportedEncodingException
  {
    super(null);
    this.apiDataSource = apiDataSource;

    if (this.apiDataSource instanceof TextBased)
    {
      TextBased tb = (TextBased) this.apiDataSource;
      this.text = tb.getText();
    }
    else
    {
      byte[] data = this.apiDataSource.getAsByteArray();
      String characterEncoding = this.apiDataSource.getCharacterEncoding();
      if (characterEncoding == null)
      {
        throw new UnsupportedEncodingException("The characterEncoding must not be null. Specify a correct encoding.");
      }
      this.text = new String(data, characterEncoding);
    }
    assert this.text != null;
  }
}