/*
    * Copyright 2005 John G. Wilson
    *
    * 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 groovy.util.slurpersupport;
  
  import groovy.lang.Closure;
  import groovy.lang.GroovyObject;
  import groovy.lang.GroovyRuntimeException;
  
  import java.io.IOException;
  import java.io.Writer;
  import java.util.Iterator;
  import java.util.Map;
  
  import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
  
  /***
   * @author John Wilson
   */
  
  public class NodeChild extends GPathResult {
      private final Node node;
  
      public NodeChild(final Node node, final GPathResult parent, final String namespacePrefix, final Map namespaceTagHints) {
          super(parent, node.name(), namespacePrefix, namespaceTagHints);
          this.node = node;
      }
  
      public NodeChild(final Node node, final GPathResult parent, final Map namespaceTagHints) {
          this(node, parent, "*", namespaceTagHints);
      }
  
      public int size() {
          return 1;
      }
  
      public String text() {
          return this.node.text();
      }
  
      public GPathResult parents() {
          // TODO Auto-generated method stub
          throw new GroovyRuntimeException("parents() not implemented yet");
      }
  
      public Iterator iterator() {
          return new Iterator() {
              private boolean hasNext = true;
  
              public boolean hasNext() {
                  return this.hasNext;
              }
  
              public Object next() {
                  try {
                      return (this.hasNext) ? NodeChild.this : null;
                  } finally {
                      this.hasNext = false;
                  }
              }
  
              public void remove() {
                  throw new UnsupportedOperationException();
              }
          };
      }
  
      public Iterator nodeIterator() {
          return new Iterator() {
              private boolean hasNext = true;
  
              public boolean hasNext() {
                  return this.hasNext;
              }
  
              public Object next() {
                  try {
                      return (this.hasNext) ? NodeChild.this.node : null;
                  } finally {
                      this.hasNext = false;
                  }
              }
  
              public void remove() {
                  throw new UnsupportedOperationException();
             }
         };
     }
 
     public Object getAt(final int index) {
         if (index == 0) {
             return node;
         } else {
             throw new ArrayIndexOutOfBoundsException(index);
         }
     }
 
     public Map attributes() {
         return this.node.attributes();
     }
 
     public Iterator childNodes() {
         return this.node.childNodes();
     }
 
     public GPathResult find(final Closure closure) {
         if (DefaultTypeTransformation.castToBoolean(closure.call(new Object[]{this.node}))) {
             return this;
         } else {
             return new NoChildren(this, "", this.namespaceTagHints);
         }
     }
 
     public GPathResult findAll(final Closure closure) {
         return find(closure);
     }
 
     public void build(final GroovyObject builder) {
         this.node.build(builder, this.namespaceMap, this.namespaceTagHints);
     }
 
     public Writer writeTo(final Writer out) throws IOException {
         return this.node.writeTo(out);
     }
 
     protected void replaceNode(final Closure newValue) {
         this.node.replaceNode(newValue, this);
     }
 
     protected void replaceBody(final Object newValue) {
         this.node.replaceBody(newValue);
     }
 
     protected void appendNode(final Object newValue) {
         this.node.appendNode(newValue, this);
     }
 }