Source Code Cross Referenced for MacroExpansionPlugin.java in  » Blogger-System » blojsom-3.1 » org » blojsom » plugin » macro » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Blogger System » blojsom 3.1 » org.blojsom.plugin.macro 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         * Copyright (c) 2003-2007, David A. Czarnecki
003:         * All rights reserved.
004:         *
005:         * Redistribution and use in source and binary forms, with or without
006:         * modification, are permitted provided that the following conditions are met:
007:         *
008:         * Redistributions of source code must retain the above copyright notice, this list of conditions and the
009:         *     following disclaimer.
010:         * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
011:         *     following disclaimer in the documentation and/or other materials provided with the distribution.
012:         * Neither the name of "David A. Czarnecki" and "blojsom" nor the names of its contributors may be used to
013:         *     endorse or promote products derived from this software without specific prior written permission.
014:         * Products derived from this software may not be called "blojsom", nor may "blojsom" appear in their name,
015:         *     without prior written permission of David A. Czarnecki.
016:         *
017:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
018:         * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
019:         * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
020:         * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
021:         * EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
022:         * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
023:         * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
025:         * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
026:         * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
027:         * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
028:         * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
029:         * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
030:         */package org.blojsom.plugin.macro;
031:
032:        import org.blojsom.blog.Blog;
033:        import org.blojsom.blog.Entry;
034:        import org.blojsom.plugin.Plugin;
035:        import org.blojsom.plugin.PluginException;
036:        import org.blojsom.util.BlojsomUtils;
037:
038:        import javax.servlet.http.HttpServletRequest;
039:        import javax.servlet.http.HttpServletResponse;
040:        import java.util.Map;
041:        import java.util.regex.Matcher;
042:        import java.util.regex.Pattern;
043:
044:        /**
045:         * Macro Expansion Plugin
046:         *
047:         * @author David Czarnecki
048:         * @author Mark Lussier
049:         * @since blojsom 3.0
050:         * @version $Id: MacroExpansionPlugin.java,v 1.2 2007/01/17 02:35:11 czarneckid Exp $
051:         */
052:        public class MacroExpansionPlugin implements  Plugin {
053:
054:            /**
055:             * Regular expression to identify macros as $MACRO$ and DOES NOT ignore escaped $'s
056:             */
057:            private static final String MACRO_REGEX = "(\\$[^\\$]*\\$)";
058:
059:            /**
060:             * Default constructor. Compiles the macro regular expression pattern, $MACRO$
061:             */
062:            public MacroExpansionPlugin() {
063:            }
064:
065:            /**
066:             * Initialize this plugin. This method only called when the plugin is instantiated.
067:             *
068:             * @throws PluginException If there is an error initializing the plugin
069:             */
070:            public void init() throws PluginException {
071:            }
072:
073:            /**
074:             * Expand macro tokens in an entry
075:             *
076:             * @param content Entry to process
077:             * @param macros  Macros to expand in the content
078:             * @return The macro expanded string
079:             */
080:            private String replaceMacros(String content, Map macros) {
081:                if (BlojsomUtils.checkNullOrBlank(content)) {
082:                    return content;
083:                }
084:
085:                Pattern macroPattern = Pattern.compile(MACRO_REGEX);
086:                Matcher matcher = macroPattern.matcher(content);
087:
088:                while (matcher.find()) {
089:                    String token = matcher.group();
090:                    String macro = token.substring(1, token.length() - 1);
091:                    if (macros.containsKey(macro)) {
092:                        content = BlojsomUtils.replace(content, token,
093:                                (String) macros.get(macro));
094:                    }
095:                }
096:
097:                return content;
098:            }
099:
100:            /**
101:             * Process the blog entries
102:             *
103:             * @param httpServletRequest  Request
104:             * @param httpServletResponse Response
105:             * @param blog                {@link Blog} instance
106:             * @param context             Context
107:             * @param entries             Blog entries retrieved for the particular request
108:             * @return Modified set of blog entries
109:             * @throws PluginException If there is an error processing the blog entries
110:             */
111:            public Entry[] process(HttpServletRequest httpServletRequest,
112:                    HttpServletResponse httpServletResponse, Blog blog,
113:                    Map context, Entry[] entries) throws PluginException {
114:                Map macros = MacroExpansionUtilities.readMacros(blog);
115:
116:                for (int i = 0; i < entries.length; i++) {
117:                    Entry entry = entries[i];
118:                    entry.setTitle(replaceMacros(entry.getTitle(), macros));
119:                    entry.setDescription(replaceMacros(entry.getDescription(),
120:                            macros));
121:                }
122:
123:                return entries;
124:            }
125:
126:            /**
127:             * Perform any cleanup for the plugin. Called after {@link #process}.
128:             *
129:             * @throws PluginException If there is an error performing cleanup for this plugin
130:             */
131:            public void cleanup() throws PluginException {
132:            }
133:
134:            /**
135:             * Called when BlojsomServlet is taken out of service
136:             *
137:             * @throws PluginException If there is an error in finalizing this plugin
138:             */
139:            public void destroy() throws PluginException {
140:            }
141:        }
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