/**
 * 
 */
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;
  }
}