/*
 * Copyright  1999-2004 The Apache Software Foundation.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package com.sun.org.apache.xml.internal.security.transforms.params;



import com.sun.org.apache.xml.internal.security.transforms.TransformParam;
import com.sun.org.apache.xml.internal.security.utils.Constants;
import com.sun.org.apache.xml.internal.security.utils.SignatureElementProxy;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;


/**
 * This Object serves both as namespace prefix resolver and as container for
 * the <CODE>ds:XPath</CODE> Element. It implements the {@link org.w3c.dom.Element} interface
 * and can be used directly in a DOM tree.
 *
 * @author Christian Geuer-Pollmann
 */
public class XPathContainer extends SignatureElementProxy implements TransformParam {

   /**
    * Constructor XPathContainer
    *
    * @param doc
    */
   public XPathContainer(Document doc) {
      super(doc);
   }

   /**
    * Sets the TEXT value of the <CODE>ds:XPath</CODE> Element.
    *
    * @param xpath
    */
   public void setXPath(String xpath) {

      if (this._constructionElement.getChildNodes() != null) {
         NodeList nl = this._constructionElement.getChildNodes();

         for (int i = 0; i < nl.getLength(); i++) {
            this._constructionElement.removeChild(nl.item(i));
         }
      }

      Text xpathText = this._doc.createTextNode(xpath);
      this._constructionElement.appendChild(xpathText);
   }

   /**
    * Returns the TEXT value of the <CODE>ds:XPath</CODE> Element.
    *
    * @return the TEXT value of the <CODE>ds:XPath</CODE> Element.
    */
   public String getXPath() {
      return this.getTextFromTextChild();
   }

   /** @inheritDoc */
   public String getBaseLocalName() {
      return Constants._TAG_XPATH;
   }
}