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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.xml.security.transforms.params;


import org.apache.xml.security.transforms.TransformParam;
import org.apache.xml.security.utils.Constants;
import org.apache.xml.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 ds:XPath 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 ds:XPath Element.
     *
     * @param xpath
     */
    public void setXPath(String xpath) {
        if (getElement().getChildNodes() != null) {
            NodeList nl = getElement().getChildNodes();

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

        Text xpathText = createText(xpath);
        appendSelf(xpathText);
    }

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

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