Source Code Cross Referenced for PathInfoMapper.java in  » Library » Apache-commons-chain-1.1-src » org » apache » commons » chain » web » servlet » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache commons chain 1.1 src » org.apache.commons.chain.web.servlet 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 1999-2004 The Apache Software Foundation
03:         *
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         *
08:         *     http://www.apache.org/licenses/LICENSE-2.0
09:         *
10:         * Unless required by applicable law or agreed to in writing, software
11:         * distributed under the License is distributed on an "AS IS" BASIS,
12:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13:         * See the License for the specific language governing permissions and
14:         * limitations under the License.
15:         */
16:        package org.apache.commons.chain.web.servlet;
17:
18:        import javax.servlet.http.HttpServletRequest;
19:        import org.apache.commons.chain.Catalog;
20:        import org.apache.commons.chain.Command;
21:        import org.apache.commons.chain.Context;
22:
23:        /**
24:         * <p>{@link Command} that uses the "path info" component of the request URI
25:         * to select a {@link Command} from the appropriate {@link Catalog}, and
26:         * execute it.  To use this command, you would typically map an instance
27:         * of {@link ChainProcessor} to a wildcard pattern like "/execute/*" and
28:         * then arrange that this is the default command to be executed.  In such
29:         * an environment, a request for the context-relative URI "/execute/foo"
30:         * would cause the "/foo" command to be loaded and executed.</p>
31:         *
32:         * @author Craig R. McClanahan
33:         */
34:
35:        public class PathInfoMapper implements  Command {
36:
37:            // ------------------------------------------------------ Instance Variables
38:
39:            private String catalogKey = ChainProcessor.CATALOG_DEFAULT;
40:
41:            // -------------------------------------------------------------- Properties
42:
43:            /**
44:             * <p>Return the context key under which our {@link Catalog} has been
45:             * stored.</p>
46:             *
47:             * @return The context key for the Catalog.
48:             */
49:            public String getCatalogKey() {
50:
51:                return (this .catalogKey);
52:
53:            }
54:
55:            /**
56:             * <p>Set the context key under which our {@link Catalog} has been
57:             * stored.</p>
58:             *
59:             * @param catalogKey The new catalog key
60:             */
61:            public void setCatalogKey(String catalogKey) {
62:
63:                this .catalogKey = catalogKey;
64:
65:            }
66:
67:            // --------------------------------------------------------- Command Methods
68:
69:            /**
70:             * <p>Look up the extra path information for this request, and use it to
71:             * select an appropriate {@link Command} to be executed.
72:             *
73:             * @param context Context for the current request
74:             * @return The result of executing the Command for the request URI.
75:             * @throws Exception if there is a problem executing the Command for
76:             *  the request URI.
77:             */
78:            public boolean execute(Context context) throws Exception {
79:
80:                // Look up the extra path information for this request
81:                ServletWebContext swcontext = (ServletWebContext) context;
82:                HttpServletRequest request = swcontext.getRequest();
83:                String pathInfo = (String) request
84:                        .getAttribute("javax.servlet.include.path_info");
85:                if (pathInfo == null) {
86:                    pathInfo = request.getPathInfo();
87:                }
88:
89:                // Map to the Command specified by the extra path info
90:                Catalog catalog = (Catalog) context.get(getCatalogKey());
91:                Command command = catalog.getCommand(pathInfo);
92:                return (command.execute(context));
93:
94:            }
95:
96:        }
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