INT-669 Added HeaderValueRouter

org.springframework.integration/src/main/java/org/springframework/integration/channel/MapBasedChannelResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2008 the original author or authors.
+ * Copyright 2002-2009 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,7 +32,25 @@ public class MapBasedChannelResolver implements ChannelResolver {
 
 	private volatile Map<String, MessageChannel> channelMap = new HashMap<String, MessageChannel>();
 
+	/**
+	 * Empty constructor for use when providing the channel map via
+	 * {@link #setChannelMap(Map)}.
+	 */
+	public MapBasedChannelResolver() {
+	}
 
+	/**
+	 * Create a {@link ChannelResolver} that uses the provided Map.
+	 * Each String key will resolve to the associated channel value.
+	 */
+	public MapBasedChannelResolver(Map<String, MessageChannel> channelMap) {
+		this.setChannelMap(channelMap);
+	}
+
+	/**
+	 * Provide a map of channels to be used by this resolver.
+	 * Each String key will resolve to the associated channel value.
+	 */
 	public void setChannelMap(Map<String, MessageChannel> channelMap) {
 		Assert.notNull(channelMap, "channelMap must not be null");
 		this.channelMap = channelMap;

org.springframework.integration/src/main/java/org/springframework/integration/router/HeaderValueRouter.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2002-2009 the original author or authors.
+ *
+ * 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.springframework.integration.router;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.springframework.integration.core.Message;
+import org.springframework.util.Assert;
+import org.springframework.util.StringUtils;
+
+/**
+ * A Message Router that resolves the MessageChannel from a header value.
+ * 
+ * @author Oleg Zhurakousky
+ * @author Mark Fisher
+ * @Since 1.0.3
+ */
+public class HeaderValueRouter extends AbstractChannelNameResolvingMessageRouter {
+
+	private final String headerName;
+
+	/**
+	 * Create a router that uses the provided header name to lookup a channel.
+	 */
+	public HeaderValueRouter(String headerName) {
+		Assert.notNull(headerName, "'headerName' must not be null");
+		this.headerName = headerName;
+	}
+
+	@Override
+	protected List<Object> getChannelIndicatorList(Message<?> message) {
+		Object value = message.getHeaders().get(this.headerName);
+		if (value instanceof String && ((String) value).indexOf(',') != -1) {
+			value = StringUtils.tokenizeToStringArray((String) value, ",", true, true);
+		}
+		return Collections.singletonList(value);
+	}
+
+}