src/org/apache/xml/security/signature/SignatureProperties.java

/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "<WebSig>" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2001, Institute for
 * Data Communications Systems, <http://www.nue.et-inf.uni-siegen.de/>.
 * The development of this software was partly funded by the European
 * Commission in the <WebSig> project in the ISIS Programme.
 * For more information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.apache.xml.security.signature;



import javax.xml.transform.TransformerException;

import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.utils.Constants;
import org.apache.xml.security.utils.IdResolver;
import org.apache.xml.security.utils.SignatureElementProxy;
import org.apache.xml.security.utils.XMLUtils;
import org.apache.xpath.XPathAPI;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;


/**
 * Handles <code>&lt;ds:SignatureProperties&gt;</code> elements
 * This Element holds {@link SignatureProperty} that contian additional information items
 * concerning the generation of the signature.
 * for example, data-time stamp, serial number of cryptographic hardware.
 *
 * @author Christian Geuer-Pollmann
 *
 */
public class SignatureProperties extends SignatureElementProxy {

   /** {@link org.apache.commons.logging} logging facility */
    static org.apache.commons.logging.Log log = 
        org.apache.commons.logging.LogFactory.getLog(SignatureProperties.class.getName());

   /**
    * Constructor SignatureProperties
    *
    * @param doc
    */
   public SignatureProperties(Document doc) {

      super(doc);

      XMLUtils.addReturnToElement(this._constructionElement);
   }

   /**
    * Constructs {@link SignatureProperties} from {@link Element}
    * @param element <code>SignatureProperties</code> elementt
    * @param BaseURI the URI of the resource where the XML instance was stored
    * @throws XMLSecurityException
    */
   public SignatureProperties(Element element, String BaseURI)
           throws XMLSecurityException {
      super(element, BaseURI);
   }

   /**
    * Return the nonnegative number of added SignatureProperty elements.
    *
    * @return the number of SignatureProperty elements
    * @throws XMLSignatureException
    */
   public int getLength() throws XMLSignatureException {

      try {
         Element nscontext = XMLUtils.createDSctx(this._doc, "ds",
                                                  Constants.SignatureSpecNS);
         NodeList propertyElems =
            XPathAPI.selectNodeList(this._constructionElement,
                                    "./ds:" + Constants._TAG_SIGNATUREPROPERTY,
                                    nscontext);

         return propertyElems.getLength();
      } catch (TransformerException ex) {
         throw new XMLSignatureException("empty", ex);
      }
   }

   /**
    * Return the <it>i</it><sup>th</sup> SignatureProperty.  Valid <code>i</code>
    * values are 0 to <code>{link@ getSize}-1</code>.
    *
    * @param i Index of the requested {@link SignatureProperty}
    * @return the <it>i</it><sup>th</sup> SignatureProperty
    * @throws XMLSignatureException
    */
   public SignatureProperty item(int i) throws XMLSignatureException {

      try {
         Element nscontext = XMLUtils.createDSctx(this._doc, "ds",
                                                  Constants.SignatureSpecNS);
         Element propertyElem =
            (Element) XPathAPI
               .selectSingleNode(this._constructionElement, "./ds:"
                                 + Constants._TAG_SIGNATUREPROPERTY + "["
                                 + (i + 1) + "]", nscontext);

         if (propertyElem == null) {
            return null;
         } else {
            return new SignatureProperty(propertyElem, this._baseURI);
         }
      } catch (TransformerException ex) {
         throw new XMLSignatureException("empty", ex);
      } catch (XMLSecurityException ex) {
         throw new XMLSignatureException("empty", ex);
      }
   }

   /**
    * Sets the <code>Id</code> attribute
    *
    * @param Id the <code>Id</code> attribute
    */
   public void setId(String Id) {

      if ((this._state == MODE_SIGN) && (Id != null)) {
         this._constructionElement.setAttributeNS(null, Constants._ATT_ID, Id);
         IdResolver.registerElementById(this._constructionElement, Id);
      }
   }

   /**
    * Returns the <code>Id</code> attribute
    *
    * @return the <code>Id</code> attribute
    */
   public String getId() {
      return this._constructionElement.getAttributeNS(null, Constants._ATT_ID);
   }

   /**
    * Method addSignatureProperty
    *
    * @param sp
    */
   public void addSignatureProperty(SignatureProperty sp) {
      this._constructionElement.appendChild(sp.getElement());
      XMLUtils.addReturnToElement(this._constructionElement);
   }

   public String getBaseLocalName() {
      return Constants._TAG_SIGNATUREPROPERTIES;
   }
}