/*
    * Copyright 2001-2011 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.
   *
   */
  package org.apache.juddi.v3.client.mapping;
  
  import java.util.Properties;
  
  public class PolicyRoundRobin implements SelectionPolicy {
  
  	public PolicyRoundRobin(Properties properties) {}
  	
  	public String select(Topology topology) {
  		
  		if (topology.getEprs().size()==0) return null;
  		
  		int pointer = topology.getPointer();
  		pointer = (pointer + 1) % topology.getEprs().size();
  		
  		topology.setPointer(pointer);
  		
  		return topology.getEprs().get(pointer);
  	}
  
  }