de.csw.linkgenerator.CSWLinksetRenderer.java Source code

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Here is the source code for de.csw.linkgenerator.CSWLinksetRenderer.java

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/*******************************************************************************
 * This file is part of the Coporate Semantic Web Project.
 * 
 * This work has been partially supported by the ``InnoProfile-Corporate Semantic Web" project funded by the German Federal
 * Ministry of Education and Research (BMBF) and the BMBF Innovation Initiative for the New German Laender - Entrepreneurial Regions.
 * 
 * http://www.corporate-semantic-web.de/
 * 
 * Freie Universitaet Berlin
 * Copyright (c) 2007-2013
 * 
 * Institut fuer Informatik
 * Working Group Coporate Semantic Web
 * Koenigin-Luise-Strasse 24-26
 * 14195 Berlin
 * 
 * http://www.mi.fu-berlin.de/en/inf/groups/ag-csw/
 * 
 * This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA or see <http://www.gnu.org/licenses/>
 ******************************************************************************/
package de.csw.linkgenerator;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.log4j.Logger;

public class CSWLinksetRenderer {

    private static final String FILENAME_CSWLINK_POPUP_HTML = "CSWLinkPopup.html";

    private static final Logger log = Logger.getLogger(CSWLinksetRenderer.class);

    private static final Pattern linksetPattern = Pattern.compile("<csw:linkset.*?>.*?</csw:linkset>");
    private static final Pattern linkPattern = Pattern.compile("<csw:link page=\"(.*?)\"");
    private static final Pattern textContentPattern = Pattern.compile(">(.*?)<");

    private String cswLinkPopupHTML;

    public CSWLinksetRenderer() {
        try {
            InputStream is = CSWLinksetRenderer.class.getResourceAsStream(FILENAME_CSWLINK_POPUP_HTML);
            if (is == null) {
                log.error("Unable to read HTML template of the CSW popup");
                return;
            }
            cswLinkPopupHTML = IOUtils.toString(is);

            // strip empty lines
            Pattern emptyLinePattern = Pattern.compile("$\n^\\s*$", Pattern.MULTILINE);
            cswLinkPopupHTML = emptyLinePattern.matcher(cswLinkPopupHTML).replaceAll("");
            cswLinkPopupHTML = cswLinkPopupHTML.replace("[", "&#91;");
            cswLinkPopupHTML = cswLinkPopupHTML.replace("]", "&#93;");
        } catch (IOException e) {
            log.error("Could not read " + FILENAME_CSWLINK_POPUP_HTML, e);
        }
    }

    public String renderLinks(String text) {
        Matcher linksetMatcher = linksetPattern.matcher(text);

        StringBuilder newText = new StringBuilder();

        int oldEnd = 0;

        while (linksetMatcher.find()) {

            String linkset = linksetMatcher.group();

            // extract the content of the text nodes
            StringBuilder textContent = new StringBuilder();
            Matcher textContentMatcher = textContentPattern.matcher(linkset);
            while (textContentMatcher.find()) {
                textContent.append(textContentMatcher.group(1));
            }

            int start = linksetMatcher.start();
            int end = linksetMatcher.end();

            newText.append(text.substring(oldEnd, start));
            newText.append("<a href=\"#\" onclick=\"showPopup(this, new Array(");

            Matcher linkMatcher = linkPattern.matcher(linkset);
            while (linkMatcher.find()) {
                String page = linkMatcher.group(1);
                newText.append('\'');
                newText.append(page);
                newText.append("',");
            }

            newText.setCharAt(newText.length() - 1, ')');

            newText.append("); return false;\">");
            newText.append(textContent);
            newText.append("</a>");

            oldEnd = end;
        }

        // append rest of text
        newText.append(text.substring(oldEnd, text.length()));

        // end == 0 means that there are no csw:linkset elements, thus we do not need to include the popup html and javascript
        if (oldEnd != 0) {
            newText.append('\n');
            newText.append(cswLinkPopupHTML);
        }

        return newText.toString();
    }
}