package at.gv.egovernment.moa.spss.server.iaik.xml;

import java.util.List;

import iaik.server.modules.xml.ExclusiveCanonicalization;

/**
 * An implementation of the <code>ExclusiveCanonicalization</code> type
 * of <code>Transformation</code>.
 * 
 * @author Patrick Peck
 * @version $Id$
 */
public class ExclusiveCanonicalizationImpl
  extends TransformationImpl
  implements ExclusiveCanonicalization {

  /** The prefixes of the namespaces to treat according to canonical XML. */
  private List inclusiveNamespacePrefixes;

  /**
   * Create a new <code>ExclusiveCanonicalizationImpl</code> object.
   * 
   * @param algorithmURI The exclusive canonicalization algorithm URI.
   * @param inclusiveNamespacePrefixes The namespace prefixes to be processed
   * according to canonical XML.
   */
  public ExclusiveCanonicalizationImpl(
    String algorithmURI,
    List inclusiveNamespacePrefixes) {
    setAlgorithmURI(algorithmURI);
    setInclusiveNamespacePrefixes(inclusiveNamespacePrefixes);
  }

  /**
   * Sets the namespace prefixes to be processed according to canonical XML.
   * 
   * @param inclusiveNamespacePrefixes The prefixes of the namespaces to treat
   * according to canonical XML.
   */
  protected void setInclusiveNamespacePrefixes(List inclusiveNamespacePrefixes) {
    this.inclusiveNamespacePrefixes = inclusiveNamespacePrefixes;
  }

  /**
   * @see iaik.server.modules.xml.ExclusiveCanonicalization#getInclusiveNamespacePrefixes()
   */
  public List getInclusiveNamespacePrefixes() {
    return inclusiveNamespacePrefixes;
  }

  /**
   * Compare this object to another <code>CanonicalizationTransform</code>.
   * 
   * @param other The object to compare this 
   * <code>ExclusiveCanonicalization</code> to.
   * @return <code>true</code>, if <code>other</code> is a
   * <code>ExclusiveCanonicalization</code> and the algorithm URIs match, 
   * otherwise <code>false</code>.
   * @see java.lang.Object#equals(Object)
   */
  public boolean equals(Object other) {
    if (other instanceof ExclusiveCanonicalization) {
      ExclusiveCanonicalization eC14n =
        (ExclusiveCanonicalization) other;
      boolean algURIEquals = getAlgorithmURI().equals(eC14n.getAlgorithmURI());
      boolean inclNSPrefs = 
        (getInclusiveNamespacePrefixes() == null || getInclusiveNamespacePrefixes().isEmpty())
        ? eC14n.getInclusiveNamespacePrefixes() == null || eC14n.getInclusiveNamespacePrefixes().isEmpty()
        : getInclusiveNamespacePrefixes().equals(eC14n.getInclusiveNamespacePrefixes());
      return algURIEquals && inclNSPrefs;
    }
    return false;
  }

}