Source Code Cross Referenced for GroovyPlugin.java in  » Blogger-System » blojsom-3.1 » org » blojsom » plugin » scripting » 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.scripting 
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.scripting;
031:
032:        import groovy.lang.GroovyClassLoader;
033:        import org.apache.commons.logging.Log;
034:        import org.apache.commons.logging.LogFactory;
035:        import org.blojsom.blog.Blog;
036:        import org.blojsom.blog.Entry;
037:        import org.blojsom.plugin.Plugin;
038:        import org.blojsom.plugin.PluginException;
039:        import org.blojsom.util.BlojsomUtils;
040:        import org.blojsom.util.BlojsomConstants;
041:
042:        import javax.servlet.http.HttpServletRequest;
043:        import javax.servlet.http.HttpServletResponse;
044:        import javax.servlet.ServletConfig;
045:        import java.io.File;
046:        import java.util.Map;
047:
048:        /**
049:         * GroovyPlugin
050:         *
051:         * @author David Czarnecki
052:         * @version $Id: GroovyPlugin.java,v 1.2 2007/01/17 02:35:06 czarneckid Exp $
053:         * @since blojsom 3.0
054:         */
055:        public class GroovyPlugin implements  Plugin {
056:
057:            private Log _logger = LogFactory.getLog(GroovyPlugin.class);
058:
059:            private static final String GROOVY_SCRIPTS_PARAM = "groovy-scripts";
060:            private static final String GROOVY_SCRIPTS_COUNTER = "BLOJSOM_GROOVY_PLUGIN_SCRIPTS_COUNTER";
061:            private static final String GROOVY_SCRIPTS_LIST = "BLOJSOM_GROOVY_PLUGIN_SCRIPTS_LIST";
062:
063:            private ServletConfig _servletConfig;
064:
065:            /**
066:             * Default constructor.
067:             */
068:            public GroovyPlugin() {
069:            }
070:
071:            /**
072:             * Set the {@link ServletConfig}
073:             *
074:             * @param servletConfig {@link ServletConfig}
075:             */
076:            public void setServletConfig(ServletConfig servletConfig) {
077:                _servletConfig = servletConfig;
078:            }
079:
080:            /**
081:             * Initialize this plugin. This method only called when the plugin is instantiated.
082:             *
083:             * @throws org.blojsom.plugin.PluginException
084:             *          If there is an error initializing the plugin
085:             */
086:            public void init() throws PluginException {
087:            }
088:
089:            /**
090:             * Process the blog entries
091:             *
092:             * @param httpServletRequest  Request
093:             * @param httpServletResponse Response
094:             * @param blog                {@link Blog} instance
095:             * @param context             Context
096:             * @param entries             Blog entries retrieved for the particular request
097:             * @return Modified set of blog entries
098:             * @throws PluginException If there is an error processing the blog entries
099:             */
100:            public Entry[] process(HttpServletRequest httpServletRequest,
101:                    HttpServletResponse httpServletResponse, Blog blog,
102:                    Map context, Entry[] entries) throws PluginException {
103:                String[] scripts = null;
104:
105:                // Parse the scripts to execute
106:                if (context.containsKey(GROOVY_SCRIPTS_LIST)) {
107:                    scripts = (String[]) context.get(GROOVY_SCRIPTS_LIST);
108:                } else {
109:                    String scriptsParam = BlojsomUtils.getRequestValue(
110:                            GROOVY_SCRIPTS_PARAM, httpServletRequest);
111:                    if (scriptsParam != null) {
112:                        scripts = BlojsomUtils.parseCommaList(scriptsParam);
113:                        context.put(GROOVY_SCRIPTS_LIST, scripts);
114:                    }
115:                }
116:
117:                if (scripts == null) {
118:                    if (_logger.isInfoEnabled()) {
119:                        _logger.info("No scripts to process");
120:                    }
121:
122:                    return entries;
123:                }
124:
125:                // Check for which script we should process if there was more than one
126:                Integer scriptToProcess;
127:                if (context.containsKey(GROOVY_SCRIPTS_COUNTER)) {
128:                    scriptToProcess = (Integer) context
129:                            .get(GROOVY_SCRIPTS_COUNTER);
130:                } else {
131:                    scriptToProcess = new Integer(0);
132:                }
133:
134:                if (scriptToProcess == null || scriptToProcess.intValue() < 0
135:                        || scriptToProcess.intValue() > scripts.length) {
136:                    if (_logger.isErrorEnabled()) {
137:                        _logger
138:                                .error("Groovy scripts counter is null or value is out of range");
139:                    }
140:
141:                    return entries;
142:                }
143:
144:                File scriptFile = new File(
145:                        _servletConfig
146:                                .getServletContext()
147:                                .getRealPath(
148:                                        BlojsomConstants.DEFAULT_CONFIGURATION_BASE_DIRECTORY)
149:                                + BlojsomConstants.DEFAULT_BLOGS_DIRECTORY
150:                                + blog.getBlogId()
151:                                + "/"
152:                                + BlojsomUtils
153:                                        .normalize(scripts[scriptToProcess
154:                                                .intValue()]));
155:                if (_logger.isDebugEnabled()) {
156:                    _logger.debug("Processing script file: "
157:                            + scriptFile.toString());
158:                }
159:
160:                GroovyClassLoader groovyClassLoader = new GroovyClassLoader(
161:                        this .getClass().getClassLoader());
162:                Plugin plugin;
163:                try {
164:                    Class scriptPluginClazz = groovyClassLoader
165:                            .parseClass(scriptFile);
166:                    plugin = (Plugin) scriptPluginClazz.newInstance();
167:                    plugin.init();
168:                    entries = plugin.process(httpServletRequest,
169:                            httpServletResponse, blog, context, entries);
170:                    plugin.cleanup();
171:                    plugin.destroy();
172:
173:                    // Increment the script to process counter
174:                    scriptToProcess = new Integer(
175:                            scriptToProcess.intValue() + 1);
176:                    context.put(GROOVY_SCRIPTS_COUNTER, scriptToProcess);
177:                } catch (Exception e) {
178:                    if (_logger.isErrorEnabled()) {
179:                        _logger.error(e);
180:                    }
181:                }
182:
183:                return entries;
184:            }
185:
186:            /**
187:             * Perform any cleanup for the plugin. Called after {@link #process}.
188:             *
189:             * @throws org.blojsom.plugin.PluginException
190:             *          If there is an error performing cleanup for this plugin
191:             */
192:            public void cleanup() throws PluginException {
193:            }
194:
195:            /**
196:             * Called when BlojsomServlet is taken out of service
197:             *
198:             * @throws org.blojsom.plugin.PluginException
199:             *          If there is an error in finalizing this plugin
200:             */
201:            public void destroy() throws PluginException {
202:            }
203:        }
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