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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.signature;

import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.utils.Constants;
import org.apache.xml.security.utils.SignatureElementProxy;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * Handles <ds:SignatureProperty> elements
 * Additional information item concerning the generation of the signature(s) can
 * be placed in this Element
 *
 * @author Christian Geuer-Pollmann
 */
public class SignatureProperty extends SignatureElementProxy {

    /**
     * Constructs{@link SignatureProperty} using specified target attribute
     *
     * @param doc the {@link Document} in which XMLsignature is placed
     * @param target the target attribute references the Signature 
     * element to which the property applies SignatureProperty
     */
    public SignatureProperty(Document doc, String target) {
        this(doc, target, null);
    }

    /**
     * Constructs {@link SignatureProperty} using sepcified target attribute and 
     * id attribute
     *
     * @param doc the {@link Document} in which XMLsignature is placed
     * @param target the target attribute references the Signature
     *  element to which the property applies
     * @param id the id will be specified by {@link Reference#getURI} in validation
     */
    public SignatureProperty(Document doc, String target, String id) {
        super(doc);

        this.setTarget(target);
        this.setId(id);
    }

    /**
     * Constructs a {@link SignatureProperty} from an {@link Element}
     * @param element SignatureProperty element
     * @param baseURI the URI of the resource where the XML instance was stored
     * @throws XMLSecurityException
     */
    public SignatureProperty(Element element, String baseURI) throws XMLSecurityException {
        super(element, baseURI);
    }

    /**
     *   Sets the id attribute
     *
     *   @param id the id attribute
     */
    public void setId(String id) {
        if (id != null) {
            setLocalIdAttribute(Constants._ATT_ID, id);
        }
    }

    /**
     * Returns the id attribute
     *
     * @return the id attribute
     */
    public String getId() {
        return getLocalAttribute(Constants._ATT_ID);
    }

    /**
     * Sets the target attribute
     *
     * @param target the target attribute
     */
    public void setTarget(String target) {
        if (target != null) {
            setLocalAttribute(Constants._ATT_TARGET, target);
        }
    }

    /**
     * Returns the target attribute
     *
     * @return the target attribute
     */
    public String getTarget() {
        return getLocalAttribute(Constants._ATT_TARGET);
    }

    /**
     * Method appendChild
     *
     * @param node
     * @return the node in this element.
     */
    public Node appendChild(Node node) {
        appendSelf(node);
        return node;
    }

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