emptyiterator.java

来自「JAVA 所有包」· Java 代码 · 共 61 行

/*
 * Copyright 1999-2004 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.
 */
/*
 * $Id: EmptyIterator.java,v 1.2.4.1 2005/09/15 08:15:05 suresh_emailid Exp $
 */
package com.sun.org.apache.xml.internal.dtm.ref;

import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.dtm.DTM;


/**
 * DTM Empty Axis Iterator. The class is immutable
 */
public final class EmptyIterator implements DTMAxisIterator
{
  private static final EmptyIterator INSTANCE =  new EmptyIterator();
  
  public static DTMAxisIterator  getInstance() {return INSTANCE;}
  
  private EmptyIterator(){}
  
  public final  int  next(){ return END; }  
  
  public final DTMAxisIterator reset(){ return this; }

  public final int getLast(){ return 0; }

  public final int getPosition(){ return 1; }

  public final void setMark(){}

  public final void gotoMark(){}

  public final DTMAxisIterator setStartNode(int node){ return this; }

  public final int getStartNode(){ return END; } 
  
  public final boolean isReverse(){return false;} 
  
  public final DTMAxisIterator cloneIterator(){ return this; }
  
  public final void setRestartable(boolean isRestartable) {}
  
  public final int getNodeByPosition(int position){ return END; } 
}