/*
 * Copyright 2003 Federal Chancellery Austria
 * MOA-SPSS has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, 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.egovernment.moa.spss.server.iaik.xml;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import iaik.server.modules.xml.XPath2Transformation;

/**
 * An object encapsulating a <code>Transformation</code> containing several
 * XPath-Filter2 expressions.
 * 
 * @author Patrick Peck
 * @version $Id$
 */
public class XPath2TransformationImpl
  extends TransformationImpl
  implements XPath2Transformation {

  /** The filters contained in this <code>XPath2Transformation</code> */
  private List xPathFilters = new ArrayList();

  /**
   * Create a new <code>XPath2TransformationImpl</code>.
   * 
   * The list of XPath-Filter2 expression is initially empty.
   */
  public XPath2TransformationImpl() {
    setAlgorithmURI(XPath2Transformation.XPATH2);
  }

  /**
   * @see iaik.server.modules.xml.XPath2Transformation#getXPathFilters()
   */
  public List getXPathFilters() {
    return xPathFilters;
  }

  /**
   * Add an XPath-Filter2 expression to the list of filters.
   * 
   * @param filter The filter to add.
   */
  public void addXPathFilter(XPath2Filter filter) {
    xPathFilters.add(filter);
  }

  /**
   * Compare this <code>XPath2Transformation</code> to another.
   * 
   * @param other The object to compare this 
   * <code>XPath2Transformation</code> to.
   * @return <code>true</code>, if <code>other</code> is an
   * <code>XPath2Transformation</code> and <code>getXPathFilters()</code> equals
   * <code>other.getXPathFilters()</code>. Otherwise <code>false</code> is
   * returned.
   * @see java.lang.Object#equals(Object)
   */
  public boolean equals(Object other) {
    if (other instanceof XPath2Transformation) {
      XPath2Transformation transform = (XPath2Transformation) other;

      return getXPathFilters().equals(transform.getXPathFilters());
    }
    return false;
  }

  /**
   * @see java.lang.Object#hashCode()
   */
  public int hashCode() {
    Iterator iter = getXPathFilters().iterator();
    int hashCode = 0;

    while (iter.hasNext()) {
      hashCode ^= iter.next().hashCode();
    }

    return hashCode;
  }

}