1 files changed, 151 insertions, 0 deletions
diff --git a/trunk/qpid/java/client/src/main/java/org/apache/qpid/client/message/AbstractAMQMessageDelegate.java b/trunk/qpid/java/client/src/main/java/org/apache/qpid/client/message/AbstractAMQMessageDelegate.java
new file mode 100644
index 0000000000..534fb19b76
--- /dev/null
+++ b/trunk/qpid/java/client/src/main/java/org/apache/qpid/client/message/AbstractAMQMessageDelegate.java
@@ -0,0 +1,151 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.qpid.client.message;
+
+import org.apache.qpid.client.AMQDestination;
+import org.apache.qpid.client.AMQQueue;
+import org.apache.qpid.client.AMQTopic;
+import org.apache.qpid.client.AMQUndefinedDestination;
+import org.apache.qpid.exchange.ExchangeDefaults;
+import org.apache.qpid.framing.AMQShortString;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * This abstract class provides exchange lookup functionality that is shared
+ * between all MessageDelegates. Update facilities are provided so that the 0-10
+ * code base can update the mappings. The 0-8 code base does not have the
+ * facility to update the exchange map so it can only use the default mappings.
+ *
+ * That said any updates that a 0-10 client performs will also benefit any 0-8
+ * connections in this VM.
+ *
+ */
+public abstract class AbstractAMQMessageDelegate implements AMQMessageDelegate
+{
+
+    private static Map<AMQShortString, Integer> _exchangeTypeMap = new ConcurrentHashMap<AMQShortString, Integer>();
+    private static Map<String, Integer> _exchangeTypeStringMap = new ConcurrentHashMap<String, Integer>();
+    private static Map<String, Integer> _exchangeTypeToDestinationType = new ConcurrentHashMap<String, Integer>();
+
+    /**
+     * Add default Mappings for the Direct, Default, Topic and Fanout exchanges.
+     */
+    static
+    {
+        _exchangeTypeMap.put(ExchangeDefaults.DIRECT_EXCHANGE_NAME, AMQDestination.QUEUE_TYPE);
+        _exchangeTypeMap.put(AMQShortString.EMPTY_STRING, AMQDestination.QUEUE_TYPE);
+        _exchangeTypeMap.put(ExchangeDefaults.TOPIC_EXCHANGE_NAME, AMQDestination.TOPIC_TYPE);
+        _exchangeTypeMap.put(ExchangeDefaults.FANOUT_EXCHANGE_NAME, AMQDestination.TOPIC_TYPE);
+
+        _exchangeTypeStringMap.put(ExchangeDefaults.DIRECT_EXCHANGE_NAME.toString(), AMQDestination.QUEUE_TYPE);
+        _exchangeTypeStringMap.put("", AMQDestination.QUEUE_TYPE);
+        _exchangeTypeStringMap.put(ExchangeDefaults.TOPIC_EXCHANGE_NAME.toString(), AMQDestination.TOPIC_TYPE);
+        _exchangeTypeStringMap.put(ExchangeDefaults.FANOUT_EXCHANGE_NAME.toString(), AMQDestination.TOPIC_TYPE);
+
+        _exchangeTypeToDestinationType.put(ExchangeDefaults.DIRECT_EXCHANGE_NAME.toString(), AMQDestination.QUEUE_TYPE);
+        _exchangeTypeToDestinationType.put(ExchangeDefaults.TOPIC_EXCHANGE_NAME.toString(), AMQDestination.TOPIC_TYPE);
+        _exchangeTypeToDestinationType.put(ExchangeDefaults.FANOUT_EXCHANGE_NAME.toString(), AMQDestination.TOPIC_TYPE);
+    }
+
+    /**
+     * Called when a Destination is requried.
+     *
+     * This will create the AMQDestination that is the correct type and value
+     * based on the incomming values.
+     * @param exchange The exchange name
+     * @param routingKey The routing key to be used for the Destination
+     * @return AMQDestination of the correct subtype
+     */
+    protected AMQDestination generateDestination(AMQShortString exchange, AMQShortString routingKey)
+    {
+        AMQDestination dest;
+        switch (getExchangeType(exchange))
+        {
+            case AMQDestination.QUEUE_TYPE:
+                dest = new AMQQueue(exchange, routingKey, routingKey);
+                break;
+            case AMQDestination.TOPIC_TYPE:
+                dest = new AMQTopic(exchange, routingKey, null);
+                break;
+            default:
+                dest = new AMQUndefinedDestination(exchange, routingKey, null);
+        }
+
+        return dest;
+    }
+
+    /**
+     * Update the exchange name to type mapping.
+     *
+     * If the newType is not known then an UNKNOWN_TYPE is created. Only if the
+     * exchange is of a known type: amq.direct, amq.topic, amq.fanout can we
+     * create a suitable AMQDestination representation
+     *
+     * @param exchange the name of the exchange
+     * @param newtype the AMQP exchange class name i.e. amq.direct
+     */
+    protected static void updateExchangeType(String exchange, String newtype)
+    {
+        Integer type = _exchangeTypeToDestinationType.get(newtype);
+        if (type == null)
+        {
+            type = AMQDestination.UNKNOWN_TYPE;
+        }
+        _exchangeTypeStringMap.put(exchange, type);
+        _exchangeTypeMap.put(new AMQShortString(exchange), type);
+    }
+
+    /**
+     * Accessor method to allow lookups of the given exchange name.
+     *
+     * This check allows the prevention of extra work required such as asking
+     * the broker for the exchange class name.
+     *
+     * @param exchange the exchange name to lookup
+     * @return true if there is a mapping for this exchange
+     */
+    protected static boolean exchangeMapContains(String exchange)
+    {
+        return _exchangeTypeStringMap.containsKey(exchange);
+    }
+
+    /**
+     * Returns an int representing the exchange type. This is used in the
+     * createDestination method to ensure the correct AMQDestiation is created. 
+     *
+     * @param exchange the exchange name to lookup
+     * @return int representing the Exchange type
+     */
+    private int getExchangeType(AMQShortString exchange)
+    {
+        Integer type = _exchangeTypeMap.get(exchange == null ? AMQShortString.EMPTY_STRING : exchange);
+
+        if (type == null)
+        {
+            return AMQDestination.UNKNOWN_TYPE;
+        }
+
+        return type;
+    }
+
+}