001/*
002 * Copyright 2009 Red Hat, Inc.
003 * Red Hat licenses this file to you under the Apache License, version
004 * 2.0 (the "License"); you may not use this file except in compliance
005 * with the License.  You may obtain a copy of the License at
006 *    http://www.apache.org/licenses/LICENSE-2.0
007 * Unless required by applicable law or agreed to in writing, software
008 * distributed under the License is distributed on an "AS IS" BASIS,
009 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
010 * implied.  See the License for the specific language governing
011 * permissions and limitations under the License.
012 */
013
014package org.hornetq.api.core;
015
016/**
017 * Constants representing pre-defined message attributes that can be referenced in HornetQ core
018 * filter expressions.
019 *
020 * @author <a href="mailto:tim.fox@jboss.com">Tim Fox</a>
021 *
022 *
023 */
024public class FilterConstants
025{
026   /**
027    * Name of the HornetQ UserID header.
028    */
029   public static final SimpleString HORNETQ_USERID = new SimpleString("HQUserID");
030   
031   /**
032    * Name of the HornetQ Message expiration header.
033    */
034   public static final SimpleString HORNETQ_EXPIRATION = new SimpleString("HQExpiration");
035   
036   /**
037    * Name of the HornetQ Message durable header.
038    */
039   public static final SimpleString HORNETQ_DURABLE = new SimpleString("HQDurable");
040   
041   /**
042    * Value for the Durable header when the message is non-durable.
043    */
044   public static final SimpleString NON_DURABLE = new SimpleString("NON_DURABLE");
045   
046   /**
047    * Value for the Durable header when the message is durable.
048    */
049   public static final SimpleString DURABLE = new SimpleString("DURABLE");
050   
051   /**
052    * Name of the HornetQ Message timestamp header.
053    */
054   public static final SimpleString HORNETQ_TIMESTAMP = new SimpleString("HQTimestamp");
055   
056   /**
057    * Name of the HornetQ Message priority header.
058    */
059   public static final SimpleString HORNETQ_PRIORITY = new SimpleString("HQPriority");
060   
061   /**
062    * Name of the HornetQ Message size header.
063    */
064   public static final SimpleString HORNETQ_SIZE = new SimpleString("HQSize");
065   
066   /**
067    * All HornetQ headers are prepended by this prefix.
068    */
069   public static final SimpleString HORNETQ_PREFIX = new SimpleString("HQ");
070   
071   private FilterConstants()
072   {
073   }
074}