/**
 * 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.
 */
/*
 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
 */
/*
 * $Id: DOMX509IssuerSerial.java 1333415 2012-05-03 12:03:51Z coheigea $
 */
package org.apache.jcp.xml.dsig.internal.dom;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

import javax.security.auth.x500.X500Principal;
import javax.xml.crypto.MarshalException;
import javax.xml.crypto.dom.DOMCryptoContext;
import javax.xml.crypto.dsig.XMLSignature;
import javax.xml.crypto.dsig.keyinfo.X509IssuerSerial;
import java.math.BigInteger;

/**
 * DOM-based implementation of X509IssuerSerial.
 *
 * @author Sean Mullan
 */
public final class DOMX509IssuerSerial extends DOMStructure
  implements X509IssuerSerial {

  private final String issuerName;
  private final BigInteger serialNumber;

  /**
   * Creates a <code>DOMX509IssuerSerial</code> containing the specified
   * issuer distinguished name/serial number pair.
   *
   * @param issuerName   the X.509 issuer distinguished name in RFC 2253
   *                     String format
   * @param serialNumber the serial number
   * @throws IllegalArgumentException if the format of <code>issuerName</code>
   *                                  is not RFC 2253 compliant
   * @throws NullPointerException     if <code>issuerName</code> or
   *                                  <code>serialNumber</code> is <code>null</code>
   */
  public DOMX509IssuerSerial(String issuerName, BigInteger serialNumber) {
    if (issuerName == null) {
      throw new NullPointerException("issuerName cannot be null");
    }
    if (serialNumber == null) {
      throw new NullPointerException("serialNumber cannot be null");
    }
    // check that issuer distinguished name conforms to RFC 2253
    new X500Principal(issuerName);
    this.issuerName = issuerName;
    this.serialNumber = serialNumber;
  }

  /**
   * Creates a <code>DOMX509IssuerSerial</code> from an element.
   *
   * @param isElem an X509IssuerSerial element
   */
  public DOMX509IssuerSerial(Element isElem) {
    Element iNElem = DOMUtils.getFirstChildElement(isElem);
    Element sNElem = DOMUtils.getNextSiblingElement(iNElem);
    issuerName = iNElem.getFirstChild().getNodeValue();
    serialNumber = new BigInteger(sNElem.getFirstChild().getNodeValue());
  }

  public String getIssuerName() {
    return issuerName;
  }

  public BigInteger getSerialNumber() {
    return serialNumber;
  }

  public void marshal(Node parent, String dsPrefix, DOMCryptoContext context)
    throws MarshalException {
    Document ownerDoc = DOMUtils.getOwnerDocument(parent);

    Element isElem = DOMUtils.createElement(ownerDoc, "X509IssuerSerial",
      XMLSignature.XMLNS, dsPrefix);
    Element inElem = DOMUtils.createElement(ownerDoc, "X509IssuerName",
      XMLSignature.XMLNS, dsPrefix);
    Element snElem = DOMUtils.createElement(ownerDoc, "X509SerialNumber",
      XMLSignature.XMLNS, dsPrefix);
    inElem.appendChild(ownerDoc.createTextNode(issuerName));
    snElem.appendChild(ownerDoc.createTextNode(serialNumber.toString()));
    isElem.appendChild(inElem);
    isElem.appendChild(snElem);
    parent.appendChild(isElem);
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (!(obj instanceof X509IssuerSerial)) {
      return false;
    }
    X509IssuerSerial ois = (X509IssuerSerial) obj;
    return (issuerName.equals(ois.getIssuerName()) &&
      serialNumber.equals(ois.getSerialNumber()));
  }

  @Override
  public int hashCode() {
    int result = 17;
    if (issuerName != null) {
      result = 31 * result + issuerName.hashCode();
    }
    if (serialNumber != null) {
      result = 31 * result + serialNumber.hashCode();
    }

    return result;
  }
}