Java tutorial
/* * #! * Ontopia Navigator * #- * Copyright (C) 2001 - 2013 The Ontopia Project * #- * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * !# */ package net.ontopia.topicmaps.nav2.portlets.pojos; import java.io.IOException; import java.io.Writer; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import net.ontopia.infoset.core.LocatorIF; import net.ontopia.topicmaps.core.TopicIF; import net.ontopia.topicmaps.core.TopicMapIF; import net.ontopia.topicmaps.query.core.InvalidQueryException; import net.ontopia.topicmaps.query.core.QueryProcessorIF; import net.ontopia.topicmaps.query.core.QueryResultIF; import net.ontopia.topicmaps.query.utils.QueryUtils; import net.ontopia.topicmaps.utils.TopicStringifiers; import net.ontopia.utils.OntopiaRuntimeException; import net.ontopia.utils.StringifierIF; import org.apache.commons.lang3.StringUtils; /** * PUBLIC: This component can render wiki formatting a la MediaWiki * into HTML. */ public class Wiki { private static StringifierIF strify = TopicStringifiers.getDefaultStringifier(); private static StringifierIF linker = new Linker(); public static void render(String text, Writer out, TopicMapIF topicmap, Map params) throws IOException { out.write("<p>"); int old = 0; for (int ix = 0; ix < text.length(); ix++) { String output = null; int end = ix; if (text.charAt(ix) == '\n') { if (ix + 1 == text.length()) { output = ""; end = ix; } else if (text.charAt(ix + 1) == '\n') { output = "</p><p>"; end = ix + 1; } else if (text.charAt(ix + 1) == '\r' && text.charAt(ix + 2) == '\n') { output = "</p><p>"; end = ix + 2; } else if (text.charAt(ix + 1) == '*') { int pos = findNextDoubleNewline(text, ix + 1, out); output = makeList(text.substring(ix + 1, pos)); end = pos + 1; } } else if (text.charAt(ix) == '=') { int pos = text.indexOf('=', ix + 1); output = "<h2>" + text.substring(ix + 1, pos) + "</h2>"; end = pos; } else if (text.charAt(ix) == '<') { if (text.substring(ix, ix + 5).equals("<pre>")) { int pos = text.indexOf("</pre>", ix + 1); output = "<pre>" + escape(text.substring(ix + 5, pos)) + "</pre>"; end = pos + 6; } else if (text.substring(ix, ix + 7).equals("<tolog>")) { int pos = text.indexOf("</tolog>", ix + 1); String query = text.substring(ix + 7, pos); output = runQuery(query, topicmap, params); end = pos + 7; // ? } } else if (text.charAt(ix) == '\'') { int length = 0; String gi = null; if (text.substring(ix, ix + 3).equals("'''")) { length = 3; gi = "b"; } else if (text.substring(ix, ix + 2).equals("''")) { length = 2; gi = "i"; } if (gi != null) { int pos = text.indexOf("''" + (length == 3 ? "'" : ""), ix + length); output = "<" + gi + ">" + text.substring(ix + length, pos) + "</" + gi + ">"; end = pos + length - 1; } } else if (text.charAt(ix) == '[') { int pos = text.indexOf(']', ix); String name = text.substring(ix + 1, pos); TopicIF topic = getTopic(name, topicmap); output = getString(topic, params); end = pos; } if (output != null) { out.write(text.substring(old, ix)); out.write(output); ix = end; old = end + 1; } } out.write(escape(text.substring(old))); out.write("</p>"); } private static String escape(String str) { str = StringUtils.replace(str, "<", "<"); str = StringUtils.replace(str, ">", ">"); return str; } private static String makeList(String rawlist) { return "<ul>\n" + StringUtils.replace(rawlist, "*", "<li>") + "</ul>"; } private static int findNextDoubleNewline(String text, int ix, Writer out) throws IOException { for (; ix < text.length(); ix++) { if (text.charAt(ix) == '\n') { int start = ix++; while (text.charAt(ix) == ' ' || text.charAt(ix) == '\r') ix++; if (text.charAt(ix) == '\n') return start; } } return ix - 2; } private static String runQuery(String query, TopicMapIF topicmap, Map params) { try { StringBuilder out = new StringBuilder(); out.append("<table>\n"); QueryProcessorIF proc = QueryUtils.getQueryProcessor(topicmap); QueryResultIF result = proc.execute(query, params); out.append("<tr>"); for (int ix = 0; ix < result.getWidth(); ix++) out.append("<th>" + result.getColumnName(ix)); while (result.next()) { out.append("<tr>"); for (int ix = 0; ix < result.getWidth(); ix++) out.append("<td>" + getString(result.getValue(ix), params)); } out.append("</table>"); return out.toString(); } catch (InvalidQueryException e) { throw new OntopiaRuntimeException(e); } } private static String getString(Object value, Map params) { if (value instanceof TopicIF) { TopicIF topic = (TopicIF) value; StringifierIF l = (StringifierIF) params.get("linker"); if (l == null) l = linker; return l.toString(topic); } else return value.toString(); } private static TopicIF getTopic(String name, TopicMapIF topicmap) { try { Map params = new HashMap(); params.put("value", name); String query = "select $TOPIC from topic-name($TOPIC, $TN), " + "value($TN, %value%)?"; QueryProcessorIF proc = QueryUtils.getQueryProcessor(topicmap); QueryResultIF result = proc.execute(query, params); if (result.next()) { return (TopicIF) result.getValue(0); } else return null; } catch (InvalidQueryException e) { throw new OntopiaRuntimeException(e); } } static class Linker implements StringifierIF { @Override public String toString(Object o) { TopicIF topic = (TopicIF) o; return "<a href=\"topic.jsp?id=" + getId(topic) + "\">" + strify.toString(topic) + "</a>"; } private String getId(TopicIF topic) { String base = topic.getTopicMap().getStore().getBaseAddress().getAddress(); Iterator it = topic.getItemIdentifiers().iterator(); while (it.hasNext()) { LocatorIF loc = (LocatorIF) it.next(); String addr = loc.getAddress(); if (addr.startsWith(base)) return addr.substring(base.length() + 1); } return topic.getObjectId(); } } }