gt:         return (keyInfoTypes.equals(oki.getContent()) && idsEqual);
context: /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  /*
   * Copyright 2005 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.
   *
   */
  /*
   * Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved.
   */
  /*
   * $Id: DOMKeyInfo.java,v 1.2 2008/07/24 15:20:32 mullan Exp $
   */
  package org.jcp.xml.dsig.internal.dom;
  
  import javax.xml.crypto.*;
  import javax.xml.crypto.dsig.*;
  import javax.xml.crypto.dsig.dom.DOMSignContext;
  import javax.xml.crypto.dsig.keyinfo.KeyInfo;
  import javax.xml.crypto.dom.*;
  
  import java.security.Provider;
  import java.util.*;
  import org.w3c.dom.Attr;
  import org.w3c.dom.Document;
  import org.w3c.dom.Element;
  import org.w3c.dom.Node;
  import org.w3c.dom.NodeList;
  
  /**
   * DOM-based implementation of KeyInfo.
   *
   * @author Sean Mullan
   */
  public final class DOMKeyInfo extends DOMStructure implements KeyInfo {
  
      private final String id;
      private final List keyInfoTypes;
  
      /**
       * Creates a <code>DOMKeyInfo</code>.
       *
       * @param content a list of one or more {@link XMLStructure}s representing
       *    key information types. The list is defensively copied to protect
       *    against subsequent modification.
       * @param id an ID attribute
       * @throws NullPointerException if <code>content</code> is <code>null</code>
       * @throws IllegalArgumentException if <code>content</code> is empty
       * @throws ClassCastException if <code>content</code> contains any entries
       *    that are not of type {@link XMLStructure}
       */
      public DOMKeyInfo(List content, String id) {
          if (content == null) {
              throw new NullPointerException("content cannot be null");
          }
          List typesCopy = new ArrayList(content);
          if (typesCopy.isEmpty()) {
              throw new IllegalArgumentException("content cannot be empty");
          }
          for (int i = 0, size = typesCopy.size(); i < size; i++) {
              if (!(typesCopy.get(i) instanceof XMLStructure)) {
                  throw new ClassCastException
                      ("content["+i+"] is not a valid KeyInfo type");
              }
          }
          this.keyInfoTypes = Collections.unmodifiableList(typesCopy);
          this.id = id;
      }
  
      /**
       * Creates a <code>DOMKeyInfo</code> from XML.
       *
       * @param kiElem KeyInfo element
       */
      public DOMKeyInfo(Element kiElem, XMLCryptoContext context,
          Provider provider) throws MarshalException {
          // get Id attribute, if specified
          Attr attr = kiElem.getAttributeNodeNS(null, "Id");
          if (attr != null) {
              id = attr.getValue();
              kiElem.setIdAttributeNode(attr, true);
          } else {
              id = null;
          }
  
          // get all children nodes
          NodeList nl = kiElem.getChildNodes();
          int length = nl.getLength();
          if (length < 1) {
              throw new MarshalException
                  ("KeyInfo must contain at least one type");
          }
          List content = new ArrayList(length);
          for (int i = 0; i < length; i++) {
              Node child = nl.item(i);
              // ignore all non-Element nodes
              if (child.getNodeType() != Node.ELEMENT_NODE) {
                  continue;
              }
              Element childElem = (Element) child;
              String localName = childElem.getLocalName();
              if (localName.equals("X509Data")) {
                  content.add(new DOMX509Data(childElem));
              } else if (localName.equals("KeyName")) {
                  content.add(new DOMKeyName(childElem));
              } else if (localName.equals("KeyValue")) {
                  content.add(new DOMKeyValue(childElem));
              } else if (localName.equals("RetrievalMethod")) {
                  content.add
                      (new DOMRetrievalMethod(childElem, context, provider));
              } else if (localName.equals("PGPData")) {
                  content.add(new DOMPGPData(childElem));
              } else { //may be MgmtData, SPKIData or element from other namespace
                  content.add(new javax.xml.crypto.dom.DOMStructure((childElem)));
              }
          }
          keyInfoTypes = Collections.unmodifiableList(content);
      }
  
      public String getId() {
          return id;
      }
  
      public List getContent() {
          return keyInfoTypes;
      }
  
      public void marshal(XMLStructure parent, XMLCryptoContext context)
          throws MarshalException {
          if (parent == null) {
              throw new NullPointerException("parent is null");
          }
  
          Node pNode = ((javax.xml.crypto.dom.DOMStructure) parent).getNode();
          String dsPrefix = DOMUtils.getSignaturePrefix(context);
          Element kiElem = DOMUtils.createElement
              (DOMUtils.getOwnerDocument(pNode), "KeyInfo",
               XMLSignature.XMLNS, dsPrefix);
          if (dsPrefix == null || dsPrefix.length() == 0) {
              kiElem.setAttributeNS
                  ("http://www.w3.org/2000/xmlns/", "xmlns", XMLSignature.XMLNS);
          } else {
              kiElem.setAttributeNS
                  ("http://www.w3.org/2000/xmlns/", "xmlns:" + dsPrefix,
                   XMLSignature.XMLNS);
          }
          marshal(pNode, kiElem, null, dsPrefix, (DOMCryptoContext) context);
      }
  
      public void marshal(Node parent, String dsPrefix,
          DOMCryptoContext context) throws MarshalException {
          marshal(parent, null, dsPrefix, context);
      }
  
      public void marshal(Node parent, Node nextSibling, String dsPrefix,
          DOMCryptoContext context) throws MarshalException {
          Document ownerDoc = DOMUtils.getOwnerDocument(parent);
  
          Element kiElem = DOMUtils.createElement
              (ownerDoc, "KeyInfo", XMLSignature.XMLNS, dsPrefix);
          marshal(parent, kiElem, nextSibling, dsPrefix, context);
      }
  
      private void marshal(Node parent, Element kiElem, Node nextSibling,
          String dsPrefix, DOMCryptoContext context) throws MarshalException {
          // create and append KeyInfoType elements
          for (int i = 0, size = keyInfoTypes.size(); i < size; i++) {
              XMLStructure kiType = (XMLStructure) keyInfoTypes.get(i);
              if (kiType instanceof DOMStructure) {
                  ((DOMStructure) kiType).marshal(kiElem, dsPrefix, context);
              } else {
                  DOMUtils.appendChild(kiElem,
                      ((javax.xml.crypto.dom.DOMStructure) kiType).getNode());
              }
          }
  
          // append id attribute
          DOMUtils.setAttributeID(kiElem, "Id", id);
  
          parent.insertBefore(kiElem, nextSibling);
      }
  
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
  
          if (!(o instanceof KeyInfo)) {
              return false;
          }
          KeyInfo oki = (KeyInfo) o;
  
          boolean idsEqual = (id == null ? oki.getId() == null :
              id.equals(oki.getId()));
  
  