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/*******************************************************************************
 * Copyright (C) 2021 The Duuba team
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 ******************************************************************************/
package org.duuba.xades;

import javax.xml.crypto.MarshalException;
import javax.xml.crypto.XMLCryptoContext;
import javax.xml.namespace.QName;

import org.apache.jcp.xml.dsig.internal.dom.XmlWriter;
import org.holodeckb2b.commons.util.Utils;

/**
 * A representation of the ReferenceInfo element as defined in respectively ETSI TS 101 903 
 * V1.4.1 andETSI EN 319 132 v1.1.1 standards. The XML schema is defined as:
 * 
 * <xsd:element name="ReferenceInfo" type="ReferenceInfoType"/>
 * <xsd:complexType name="ReferenceInfoType">
 *    <xsd:sequence>
 *       <xsd:element ref="ds:DigestMethod"/>
 *       <xsd:element ref="ds:DigestValue"/>
 *    </xsd:sequence>
 *    <xsd:attribute name="Id" type="xsd:ID" use="optional"/>
 *    <xsd:attribute name="URI" type="xsd:anyURI" use="optional"/>
 * </xsd:complexType>
 *  
 * 
 * @author Sander Fieten (sander at chasquis-messaging.com)
 */
public class ReferenceInfo extends AbstractDigestAlgAndValueTypeElement {
	
	private static final QName ELEMENT_NAME = new QName(Constants.XADES_132_NS_URI, "ReferenceInfo", 
														Constants.XADES_132_NS_PREFIX);

	private String	id;
	private String	uri;

	
	ReferenceInfo(final String id, final String uri, final String digestAlg, final byte[] digestVal) {
		super(digestAlg, digestVal);
		this.id = id;
		this.uri = uri;
	}
	
	/**
	 * @return the Id attribute (may be null if not specified) 
	 */
	public String getId() {
		return id;
	}

	/**
	 * @return reference to the object included in the timestamp. 
	 */
	public String getURI() {
		return uri;
	}

	/**
	 * Determines whether the other object is an instance of the same class and represents the same element, i.e. has
	 * the same content.
	 * 
	 * @param o 	the other object
	 * @return 		true iff o represents the same element, i.e. has the same qualified name
	 * 				and list of child elements.
	 */	
	@Override
	public boolean equals(Object o) {
		if (!super.equals(o))
			return false;
		
		ReferenceInfo other = (ReferenceInfo) o;		
		return Utils.nullSafeEqual(this.id, other.id) && Utils.nullSafeEqual(this.uri, other.uri);
	}
	
	@Override
	protected QName getName() {
		return ELEMENT_NAME;
	}

	@Override
	protected void writeContent(XmlWriter xwriter, String nsPrefix, String dsPrefix, XMLCryptoContext context)
			throws MarshalException {
		
		// Write attributes
		if (id != null && !id.isEmpty())
			xwriter.writeIdAttribute("", Constants.XADES_141_NS_URI, "Id", id);         
		if (uri != null && !uri.isEmpty())
			xwriter.writeIdAttribute("", Constants.XADES_132_NS_URI, "URI", uri);         
        
		super.writeContent(xwriter, nsPrefix, dsPrefix, context);         	
	}
}