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/**
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* '$RCSfile$'
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* Copyright: 2007 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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*
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* '$Author: tao $'
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* '$Date: 2007-04-26 17:22:02 -0700 (Thu, 26 Apr 2007) $'
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* '$Revision: 3250 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat;
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import java.io.File;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.io.Writer;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.util.TimerTask;
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import org.apache.log4j.Logger;
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/**
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* A Sitemap represents a document that lists all of the content of the Metacat
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* server for use by harvesting spiders that wish to index the contents of the
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* Metacat site. It is used to generate an XML representation of all of the URLs
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* of the site in order to facilitate indexing of the metacat site by search
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* engines.
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*
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* @author Matt Jones
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*/
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public class Sitemap extends TimerTask {
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/**
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* Construct a new instance of the Sitemap.
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*
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* @param directory
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* the location to store sitemap files
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* @param urlRoot
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* the base URL for constructing sitemap URLs
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* @param skin
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* the format skin to be used in URLs
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*/
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public Sitemap(File directory, String urlRoot, String skin) {
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super();
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this.directory = directory;
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this.urlRoot = urlRoot;
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this.skin = skin;
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}
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/**
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* Execute the timed task when called, in this case by generating the
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* sitemap files needed for this Metacat instance.
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*/
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public void run() {
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generateSitemaps();
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}
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/**
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* Generate all of the sitemap files needed to list the URLs from this
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* instance of Metacat, using the open sitemap format described here:
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*
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* URLs are written to a single file, unless the maximum number of URLs
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* allowed inthe sitemap file is exceeded, in which subsequent numbered
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* files are created.
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*
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* @param directory
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* an existing File directory in which to write the sitemaps
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* @param urlRoot
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* the base URL to use in constructing document URLs
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* @param skin
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* the name of the skin to be used in formatting metacat
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* documents
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*/
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public void generateSitemaps() {
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Logger logMetacat = Logger.getLogger(Sitemap.class);
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logMetacat.info("Running the Sitemap task.");
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// Test if the passed in File is a directory
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if (directory.isDirectory()) {
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// Query xml_documents to get list of documents
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StringBuffer query = new StringBuffer();
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// TODO: make the doctype configurable in the query
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query.append("select docid, rev from xml_documents "
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+ "where doctype LIKE 'eml:%' " + "order by docid, rev");
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DBConnection dbConn = null;
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int serialNumber = -1;
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try {
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// Get a database connection from the pool
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dbConn = DBConnectionPool
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.getDBConnection("Sitemap.generateSitemap()");
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serialNumber = dbConn.getCheckOutSerialNumber();
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// Execute the query statement
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PreparedStatement stmt = dbConn.prepareStatement(query
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.toString());
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stmt.execute();
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ResultSet rs = stmt.getResultSet();
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// Loop through all of the documents, and write them to a
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// sitemap
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File sitemapFile = null;
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FileWriter sitemap = null;
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int counter = 0;
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int fileNumber = 0;
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while (rs.next()) {
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// Check if a new sitemap file needs to be created
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if (counter % MAX_URLS_IN_FILE == 0) {
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// if a sitemap file is already open
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if (sitemapFile != null && sitemapFile.canWrite()) {
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// write the footer and close the file
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writeSitemapFooter(sitemap);
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}
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// Open a new sitemap file for writing
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fileNumber++;
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sitemapFile = new File(directory, fileRoot + fileNumber
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+ ".xml");
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sitemap = new FileWriter(sitemapFile);
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// Write the sitemap document header for the new file
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writeSitemapHeader(sitemap);
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}
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String separator = MetaCatUtil.getOption("accNumSeparator");
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String docid = rs.getString(1) + separator
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+ rs.getString(2);
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writeSitemapEntry(sitemap, docid);
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counter++;
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}
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stmt.close();
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writeSitemapFooter(sitemap);
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} catch (SQLException e) {
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logMetacat.warn("Error while writing to the sitemap file: "
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+ e.getMessage());
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} catch (IOException ioe) {
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logMetacat.warn("Could not open or write to the sitemap file."
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+ ioe.getMessage());
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} finally {
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// Return database connection to the pool
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DBConnectionPool.returnDBConnection(dbConn, serialNumber);
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}
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} else {
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logMetacat.warn("Sitemap not created because directory not valid.");
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}
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}
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/**
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* Write the header information in a single sitemap file. This includes the
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* XML prolog, the root element and namespace declaration, and the elements
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* leading up to the first URL entry.
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*
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* @param sitemap
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* the Writer to use for writing the header
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* @throws IOException
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* if there is a problem writing to the Writer
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*/
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private void writeSitemapHeader(Writer sitemap) throws IOException {
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sitemap.write(PROLOG);
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String header = "<urlset xmlns=\"http://www.google.com/schemas/sitemap/0.84\">\n";
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sitemap.write(header);
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sitemap.flush();
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}
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/**
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* Write a URL entry to a single sitemap file. This includes the XML markup
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* surrounding a particular site URL.
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*
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* @param sitemap
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* the Writer to use for writing the URL
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* @param docid
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* the identifier to be written in the URL
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* @param urlRoot
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* the base URL to be used in constructing a URL
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* @param skin
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* the name of the skin to be used in constructing a URL
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* @throws IOException
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* if there is a problem writing to the Writer
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*/
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private void writeSitemapEntry(Writer sitemap, String docid)
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throws IOException {
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if (sitemap != null && docid != null && urlRoot != null) {
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StringBuffer url = new StringBuffer();
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url.append(urlRoot);
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if (!urlRoot.endsWith("/")) {
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url.append("/");
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}
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url.append(docid);
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if (skin != null) {
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url.append("/");
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url.append(skin);
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}
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sitemap.write("<url><loc>");
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sitemap.write(url.toString());
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sitemap.write("</loc>");
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// <lastmod>2005-01-01</lastmod>
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// <changefreq>monthly</changefreq>
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// <priority>0.8</priority>
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sitemap.write("</url>");
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sitemap.write("\n");
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sitemap.flush();
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}
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}
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/**
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* Write the footer information in a single sitemap file and close the file.
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* This includes the closing tag for the root element.
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*
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* @param sitemap
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* the Writer to use for writing the footer
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* @throws IOException
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* if there is a problem writing to the Writer
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*/
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private void writeSitemapFooter(Writer sitemap) throws IOException {
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if (sitemap != null)
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{
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String footer = "</urlset>\n";
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sitemap.write(footer);
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sitemap.close();
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}
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}
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// Member variables
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/** The directory in which sitemaps are written. */
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private File directory;
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/** The root url for constructing sitemap URLs. */
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private String urlRoot;
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/** The name of the format skin to be used in sitemap URLs. */
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private String skin;
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/** Maximum number of URLs to write to a single sitemap file */
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static final int MAX_URLS_IN_FILE = 25000; // 50,000 according to Google
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/** The root name to be used in naming sitemap files. */
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static final String fileRoot = "metacat";
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/** A String constant containing the XML prolog to be written in files. */
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static final String PROLOG = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n";
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}
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