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.aggregator;
031:
032: import org.blojsom.fetcher.Fetcher;
033: import org.blojsom.fetcher.FetcherException;
034: import org.blojsom.plugin.Plugin;
035: import org.blojsom.plugin.PluginException;
036: import org.blojsom.blog.Blog;
037: import org.blojsom.blog.Entry;
038: import org.blojsom.blog.Category;
039: import org.blojsom.util.BlojsomUtils;
040: import org.blojsom.util.BlojsomConstants;
041: import org.apache.commons.logging.Log;
042: import org.apache.commons.logging.LogFactory;
043:
044: import javax.servlet.http.HttpServletRequest;
045: import javax.servlet.http.HttpServletResponse;
046: import java.util.Map;
047: import java.util.HashMap;
048:
049: /**
050: * Internal Aggregator plugin
051: *
052: * @author David Czarnecki
053: * @since blojsom 3.1
054: * @version $Id: InternalAggregatorPlugin.java,v 1.4 2007/01/17 02:35:08 czarneckid Exp $
055: */
056: public class InternalAggregatorPlugin implements Plugin {
057:
058: private Log _logger = LogFactory
059: .getLog(InternalAggregatorPlugin.class);
060:
061: private static final String BLOJSOM_PLUGIN_AGGREGATOR_BLOGS = "BLOJSOM_PLUGIN_AGGREGATOR_BLOGS";
062: private static final int DEFAULT_PAGE_SIZE = 15;
063:
064: private Fetcher _fetcher;
065:
066: /**
067: * Construct a new instance of the Internal Aggregator plugin
068: */
069: public InternalAggregatorPlugin() {
070: }
071:
072: /**
073: * Set the {@link Fetcher}
074: *
075: * @param fetcher {@link Fetcher}
076: */
077: public void setFetcher(Fetcher fetcher) {
078: _fetcher = fetcher;
079: }
080:
081: /**
082: * Initialize this plugin. This method only called when the plugin is instantiated.
083: *
084: * @throws PluginException 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: Category category = (Category) context
104: .get(BlojsomConstants.BLOJSOM_REQUESTED_CATEGORY);
105:
106: String pgNum = BlojsomUtils.getRequestValue(
107: BlojsomConstants.PAGE_NUMBER_PARAM, httpServletRequest);
108: int page;
109: try {
110: page = Integer.parseInt(pgNum);
111: } catch (NumberFormatException e) {
112: page = 1;
113: }
114:
115: int pageSize = blog.getBlogDisplayEntries();
116: if (pageSize <= 0) {
117: pageSize = DEFAULT_PAGE_SIZE;
118: }
119:
120: Map blogs = new HashMap();
121:
122: try {
123: entries = _fetcher.loadEntries(pageSize, page, category,
124: _fetcher.loadAllCategories(blog));
125: for (int i = 0; i < entries.length; i++) {
126: Entry entry = entries[i];
127: if (!blogs.containsKey(entry.getBlogId())) {
128: blogs.put(entry.getBlogId(), _fetcher
129: .loadBlog(entry.getBlogId()));
130: }
131: }
132: } catch (FetcherException e) {
133: if (_logger.isErrorEnabled()) {
134: _logger.error(e);
135: }
136: }
137:
138: context.put(BLOJSOM_PLUGIN_AGGREGATOR_BLOGS, blogs);
139:
140: return entries;
141: }
142:
143: /**
144: * Perform any cleanup for the plugin. Called after {@link #process}.
145: *
146: * @throws PluginException If there is an error performing cleanup for this plugin
147: */
148: public void cleanup() throws PluginException {
149: }
150:
151: /**
152: * Called when BlojsomServlet is taken out of service
153: *
154: * @throws PluginException If there is an error in finalizing this plugin
155: */
156: public void destroy() throws PluginException {
157: }
158: }
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