/*
* 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.commons.chain.web.servlet;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.chain.Catalog;
import org.apache.commons.chain.Context;
import org.apache.commons.chain.Command;
import org.apache.commons.chain.generic.LookupCommand;
/**
* <p>{@link Command} that uses the "path info" component of the request URI
* to select a {@link Command} from the appropriate {@link Catalog}, and
* execute it. To use this command, you would typically map an instance
* of {@link ChainProcessor} to a wildcard pattern like "/execute/*" and
* then arrange that this is the default command to be executed. In such
* an environment, a request for the context-relative URI "/execute/foo"
* would cause the "/foo" command to be loaded and executed.</p>
*
* @author Craig R. McClanahan
*/
public class PathInfoMapper extends LookupCommand implements Command {
// ------------------------------------------------------ Instance Variables
private String catalogKey = ChainProcessor.CATALOG_DEFAULT;
// -------------------------------------------------------------- Properties
/**
* <p>Return the context key under which our {@link Catalog} has been
* stored.</p>
*
* @return The context key for the Catalog.
*
* @deprecated Use catalogName to specify the name of the catalog in the
* catalog factory
*/
public String getCatalogKey() {
return (this.catalogKey);
}
/**
* <p>Set the context key under which our {@link Catalog} has been
* stored.</p>
*
* @param catalogKey The new catalog key
*
* @deprecated Use catalogName to specify the name of the catalog in the
* catalog factory
*/
public void setCatalogKey(String catalogKey) {
this.catalogKey = catalogKey;
}
// --------------------------------------------------------- Command Methods
/**
* <p>Look up the extra path information for this request, and use it to
* select an appropriate {@link Command} to be executed.
*
* @param context Context for the current request
* @return The name of the {@link Command} instance
*
* @since Chain 1.2
*/
protected String getCommandName(Context context) {
// Look up the extra path information for this request
ServletWebContext swcontext = (ServletWebContext) context;
HttpServletRequest request = swcontext.getRequest();
String pathInfo = (String)
request.getAttribute("javax.servlet.include.path_info");
if (pathInfo == null) {
pathInfo = request.getPathInfo();
}
return pathInfo;
}
/**
* <p>Return the {@link Catalog} to look up the {@link Command} in.</p>
*
* @param context {@link Context} for this request
* @return The catalog.
* @exception IllegalArgumentException if no {@link Catalog}
* can be found
*
* @since Chain 1.2
*/
protected Catalog getCatalog(Context context) {
Catalog catalog = (Catalog) context.get(getCatalogKey());
if (catalog == null) {
catalog = super.getCatalog(context);
}
return catalog;
}
}