svn commit: r616931 - /mina/asyncweb/trunk/server/src/main/java/org/apache/asyncweb/server/resolver/PatternMatchResolver.java

[jv...@apache.org]

Author: jvermillard
Date: Wed Jan 30 14:44:08 2008
New Revision: 616931

URL: http://svn.apache.org/viewvc?rev=616931&view=rev
Log:
regular expression based resolver

Added:
    mina/asyncweb/trunk/server/src/main/java/org/apache/asyncweb/server/resolver/PatternMatchResolver.java

Added: mina/asyncweb/trunk/server/src/main/java/org/apache/asyncweb/server/resolver/PatternMatchResolver.java
URL: http://svn.apache.org/viewvc/mina/asyncweb/trunk/server/src/main/java/org/apache/asyncweb/server/resolver/PatternMatchResolver.java?rev=616931&view=auto
==============================================================================
--- mina/asyncweb/trunk/server/src/main/java/org/apache/asyncweb/server/resolver/PatternMatchResolver.java (added)
+++ mina/asyncweb/trunk/server/src/main/java/org/apache/asyncweb/server/resolver/PatternMatchResolver.java Wed Jan 30 14:44:08 2008
@@ -0,0 +1,115 @@
+/*
+ *  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.asyncweb.server.resolver;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.regex.Pattern;
+
+import org.apache.asyncweb.common.HttpRequest;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * A <code>ServiceResolver</code> which maps request URIs to service names. An
+ * pattern match is required on a request URI to a service name for returning
+ * the matching service. Pattern are in the {@link Pattern} format.<br/>
+ * For example : "/hello/.*" will match all the URI begining by the string
+ * "/hello/".
+ * 
+ * @author The Apache MINA Project (dev@mina.apache.org)
+ * @version $Rev: 601236 $, $Date: 2007-12-05 08:53:03 +0100 (mer, 05 déc 2007) $
+ */
+public class PatternMatchResolver implements ServiceResolver {
+	private static final Logger LOG = LoggerFactory
+			.getLogger(PatternMatchResolver.class);
+
+	private Map<Pattern, String> serviceMap = new HashMap<Pattern, String>();
+
+	/**
+	 * Adds a mapping from a request URI to a service name. Any existing mapping
+	 * for the same pattern is overwritten.
+	 * 
+	 * @param regexp
+	 *            The regular expression string {@link Pattern}
+	 * @param serviceName
+	 *            The matching service name
+	 */
+	public void addPatternMapping(String regexp, String serviceName) {
+		String existingMapping = serviceMap.put(Pattern.compile(regexp), serviceName);
+		if (existingMapping != null) {
+			LOG.info("Existing match [ "+existingMapping+" ] replaced by "
+					+ "[" + serviceName + "] for pattern [" + regexp + "]");
+		} else {
+			LOG.info("Mapped [" + regexp + "] to service [" + serviceName + "]");
+		}
+	}
+
+	/**
+	 * Sets all pattern - service name mappings from a given map. Any existing
+	 * mappings are removed
+	 * 
+	 * @param map
+	 *            The map to set from
+	 * @throws ClassCastException
+	 *             If any element (key or value) in the map is not a
+	 *             <code>java.lang.String</code>
+	 */
+	public void setMappings(Map<String, String> map) {
+		serviceMap.clear();
+		for (Entry<String, String> entry : map.entrySet()) {
+			String key = entry.getKey();
+			String value = entry.getValue();
+			addPatternMapping(key, value);
+		}
+	}
+
+	/**
+	 * Attempts to resolve a service name for the specified request by looking
+	 * for an existing pattern matching with the URI as the specified request.
+	 * 
+	 * @param request
+	 *            The request for which a service name is to be resolved
+	 * @return The name of the service, or <code>null</code> if no mapping
+	 *         pattern exists for the requests URI
+	 */
+	public String resolveService(HttpRequest request) {
+		if (request.getRequestUri().isAbsolute()) {
+			return null;
+		}
+
+		String path = request.getRequestUri().getPath();
+		
+		// loop around patterns
+		for(Entry<Pattern, String> entry : serviceMap.entrySet()) {
+			if(entry.getKey().matcher(path).matches()) {
+				if(LOG.isDebugEnabled())
+					LOG.debug("Mapped [" + path + "] to service [" + entry.getValue() + "]");
+				return entry.getValue();
+			}
+		}
+		
+		if (LOG.isDebugEnabled()) {
+			LOG.debug("No mapping for path [" + path + "]");
+		}
+		return null;
+	}
+}