text: /*
   *                         Vortex OpenSplice
   *
   *   This software and documentation are Copyright 2006 to TO_YEAR ADLINK
   *   Technology Limited, its affiliated companies and licensors. All rights
   *   reserved.
   *
   *   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.
   *
   */
  
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.Iterator;
  
  import org.omg.dds.core.ServiceEnvironment;
  import org.omg.dds.core.policy.DestinationOrder;
  import org.omg.dds.core.policy.Durability;
  import org.omg.dds.core.policy.Partition;
  import org.omg.dds.core.policy.PolicyFactory;
  import org.omg.dds.core.policy.Reliability;
  import org.omg.dds.core.status.Status;
  import org.omg.dds.domain.DomainParticipant;
  import org.omg.dds.domain.DomainParticipantFactory;
  import org.omg.dds.sub.DataReader;
  import org.omg.dds.sub.DataReaderQos;
  import org.omg.dds.sub.Sample;
  import org.omg.dds.sub.Subscriber;
  import org.omg.dds.sub.SubscriberQos;
  import org.omg.dds.topic.ContentFilteredTopic;
  import org.omg.dds.topic.Topic;
  import org.omg.dds.topic.TopicQos;
  
  import StockMarket.Stock;
  
  public class ContentFilteredTopicDataSubscriber {
  
  	public static void main(String[] args) {
  		String stkToSubscribe = null;
  		if (args.length > 0) {
  			stkToSubscribe = args[0];
  		}
  
  		String partitionName = "ContentFilteredTopic example";
  
  		try {
              System.setProperty(
                        ServiceEnvironment.IMPLEMENTATION_CLASS_NAME_PROPERTY,
                        "org.opensplice.dds.core.OsplServiceEnvironment");
              ServiceEnvironment env = ServiceEnvironment
                        .createInstance(ContentFilteredTopicDataSubscriber.class.getClassLoader());
  
              DomainParticipantFactory dpf = DomainParticipantFactory.getInstance(env);
  
              // create Domain Participant
              DomainParticipant participant = dpf.createParticipant();
  
              // create Topic with reliable and transient qos
              PolicyFactory policyFactory = env.getSPI().getPolicyFactory();
              Reliability reliable = policyFactory.Reliability().withReliable();
              Durability durability = policyFactory.Durability().withTransient();
              DestinationOrder des = policyFactory.DestinationOrder().withSourceTimestamp();
              TopicQos topicQos = participant.getDefaultTopicQos().withPolicies(reliable,durability,des);
              Collection<Class<? extends Status>> status = new HashSet<Class<? extends Status>>();
              Topic<Stock> topic = participant.createTopic("StockTrackerExclusive", Stock.class,topicQos, null, status);
  
              // create Subscriber with partition qos
              Partition partition = policyFactory.Partition().withName(partitionName);
              SubscriberQos subQos = participant.getDefaultSubscriberQos().withPolicy(partition);
              Subscriber sub = participant.createSubscriber(subQos);
  
      		String parameters[] = new String[0];
      		DataReader<Stock> reader = null;
      		ContentFilteredTopic<Stock> cfTopic = null;
      		DataReaderQos drQos = sub.copyFromTopicQos(sub.getDefaultDataReaderQos(),topic.getQos());
      		if (stkToSubscribe == null) {
      			// Subscribe to all stocks
  
                  reader = sub.createDataReader(topic,drQos);
      		} else {
      			// create Content Filtered Topic
      			String sqlExpr = "ticker = '" + stkToSubscribe + "'";
      			cfTopic = participant.createContentFilteredTopic("MyStockTopic",topic, sqlExpr, parameters);
  
      			// create Filtered DataReader
      			reader = sub.createDataReader(cfTopic,drQos);
      		}
  
      		// Read Events
      		boolean terminate = false;
      		int count = 0;
      		System.out.println("Ready");
      		while (!terminate && count < 1500) { // We dont want the example to run indefinitely
      		    Iterator<Sample<Stock>> samples = reader.take();
      		    /* Process each Sample*/
      		     while (samples.hasNext()) {
      		        Sample<Stock> sample = samples.next();
      		        Stock stock = sample.getData();
      		        if (stock != null) { /* Check if the sample is valid. */
      		            if (stock.price == -1.0f) {
                              terminate = true;
                              break;
                          }
      		            System.out.println(stock.ticker + ": "
                                  + stock.price);
      		        }
      		    }
      			try {
      				Thread.sleep(200);
      			}
      			catch(InterruptedException ie) {
      				// nothing to do
      			}
      			++count;
      		}
      		System.out.println("Market Closed");
              // clean up
              participant.close();
  		} catch(Exception e) {
  		    System.out.println("Error occured: " + e.getMessage());
              e.printStackTrace();
  		}
  
  	}
  }
  