/*
    * Copyright 2004-2009 the original author or authors.
    *
    * 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.
   */
  
  package org.springmodules.validation.util.xml;
  
  import org.springmodules.validation.util.collection.FilteredIterator;
  import org.springmodules.validation.util.condition.AbstractCondition;
  import org.w3c.dom.Node;
  
  /**
   * An iterator that iterates over the child elements of a given node.
   *
   * @author Uri Boness
   */
  public class SubElementsIterator extends FilteredIterator {
  
      public SubElementsIterator(Node node) {
          super(new ChildNodesIterator(node), new AbstractCondition() {
              public boolean doCheck(Object object) {
                  Node node = (Node) object;
                  return node.getNodeType() == Node.ELEMENT_NODE;
              }
          });
      }
  
      public SubElementsIterator(Node node, final String elementName) {
          super(new ChildNodesIterator(node), new AbstractCondition() {
              public boolean doCheck(Object object) {
                  Node node = (Node) object;
                  return node.getNodeType() != Node.ELEMENT_NODE
                      && node.getLocalName().equals(elementName);
              }
          });
      }
  
      public SubElementsIterator(Node node, final String namespace, final String elementName) {
          super(new ChildNodesIterator(node), new AbstractCondition() {
              public boolean doCheck(Object object) {
                  Node node = (Node) object;
                  return node.getNodeType() == Node.ELEMENT_NODE
                      && node.getLocalName().equals(elementName)
                      && node.getNamespaceURI().equals(namespace);
              }
          });
      }
  }