Source Code Cross Referenced for TemplateHandler.java in  » Ajax » dwr » org » directwebremoting » servlet » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » dwr » org.directwebremoting.servlet 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 2005 Joe Walker
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.directwebremoting.servlet;
17:
18:        import java.io.IOException;
19:        import java.util.Map;
20:
21:        import javax.servlet.http.HttpServletRequest;
22:        import javax.servlet.http.HttpServletResponse;
23:
24:        /**
25:         * A {@link org.directwebremoting.extend.Handler} that allows some very simple
26:         * search and replace templating. The general recommended syntax is to use
27:         * ${search} as the string to be searched for, to allow future expansion to a
28:         * more EL-like syntax.
29:         * @author Joe Walker [joe at getahead dot ltd dot uk]
30:         */
31:        public abstract class TemplateHandler extends CachingFileHandler {
32:            /* (non-Javadoc)
33:             * @see org.directwebremoting.servlet.CachingFileHandler#generate(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
34:             */
35:            @Override
36:            protected String generateCachableContent(
37:                    HttpServletRequest request, HttpServletResponse response)
38:                    throws IOException {
39:                String template = generateTemplate(request, response);
40:
41:                Map<String, String> replace = getSearchReplacePairs();
42:                if (replace != null) {
43:                    for (Map.Entry<String, String> entry : replace.entrySet()) {
44:                        String search = entry.getKey();
45:                        if (template.contains(search)) {
46:                            template = template.replace(search, entry
47:                                    .getValue());
48:                        }
49:                    }
50:                }
51:
52:                return template;
53:            }
54:
55:            /**
56:             * Generate a template to undergo search and replace processing according to
57:             * the search and replace pairs from {@link #getSearchReplacePairs()}.
58:             * @param request The HTTP request data
59:             * @param response Where we write the HTTP response data
60:             * @return A template string containing ${} sections to be replaced
61:             */
62:            protected abstract String generateTemplate(
63:                    HttpServletRequest request, HttpServletResponse response)
64:                    throws IOException;
65:
66:            /**
67:             * Mostly when we send a file out, we don't change anything so the default
68:             * set of search and replaces is empty.
69:             * Engine.js can override this with strings to customize the output
70:             * @return a map of search (key) and replace (value) strings
71:             */
72:            public Map<String, String> getSearchReplacePairs() {
73:                return null;
74:            }
75:        }
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