Java tutorial
/* * Copyright 2009-2011 Universitt Duisburg-Essen, Working Group * "Information Engineering" * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package de.unidue.inf.is.ezdl.gframedl.converter; import java.io.UnsupportedEncodingException; import java.net.URL; import java.net.URLEncoder; import java.util.LinkedList; import java.util.List; import org.apache.commons.lang.StringEscapeUtils; import org.apache.log4j.Logger; import de.unidue.inf.is.ezdl.dlcore.data.dldata.Person; import de.unidue.inf.is.ezdl.dlcore.data.dldata.PersonList; import de.unidue.inf.is.ezdl.dlcore.data.dldata.Term; import de.unidue.inf.is.ezdl.dlcore.data.dldata.TextDocument; import de.unidue.inf.is.ezdl.dlcore.data.dldata.URLList; import de.unidue.inf.is.ezdl.dlcore.data.fields.Field; import de.unidue.inf.is.ezdl.dlcore.utils.StringUtils; import de.unidue.inf.is.ezdl.dlfrontend.converter.DocumentConversionStrategy; import de.unidue.inf.is.ezdl.dlfrontend.converter.ExportResult; import de.unidue.inf.is.ezdl.dlfrontend.converter.ExportResultText; import de.unidue.inf.is.ezdl.dlfrontend.converter.SimpleObjectConversionStrategy; import de.unidue.inf.is.ezdl.dlfrontend.i18n.I18nSupport; import de.unidue.inf.is.ezdl.gframedl.helper.EzDLProtocolHandler; /** * Conversion strategy class. Converts document to HTML format. */ public class HTMLConversionStrategy implements DocumentConversionStrategy, SimpleObjectConversionStrategy { private I18nSupport i18n = I18nSupport.getInstance(); private String styleSheet = stylesheetPath(); private static Logger logger = Logger.getLogger(HTMLConversionStrategy.class); @Override public ExportResult print(TextDocument document) { LinkedList<TextDocument> list = new LinkedList<TextDocument>(); list.add(document); return print(list); } @Override public ExportResult print(List<TextDocument> documents) { StringBuilder html = new StringBuilder(); html.append("<html><head><link rel=\"stylesheet\" type=\"text/css\" href=\"").append(styleSheet) .append("\"></head><body>"); for (TextDocument document : documents) { printSingleDocument(document, html); } html.append("</body></html>"); ExportResultText out = new ExportResultText(html); return out; } private void printSingleDocument(TextDocument document, StringBuilder html) { html.append("<h2>").append(escape(document.getTitle())).append("</h2>"); if (document.getYear() != Integer.MIN_VALUE) { html.append("<p><b>").append(i18n.getLocString("field.year")).append("</b>: ") .append(document.getYear()).append("</p>"); } PersonList al = document.getAuthorList(); if ((al != null) && (!al.isEmpty())) { String authorLabel = getAuthorFieldLabel(al); html.append("<p><b>").append(escape(authorLabel)).append("</b></p>"); html.append(generateListIcon("author")); for (Person a : al) { html.append("<li>").append(createAuthorlink(a)).append("</li>"); } html.append("</ul>"); } if (!StringUtils.isEmpty(document.getAbstract())) { html.append("<p><b>").append(i18n.getLocString("field.abstract")).append("</b></p>"); html.append("<div>"); printToHTMLescaped(html, "p", document.getAbstract()); html.append("</div>"); } URLList urls = (URLList) document.getFieldValue(Field.URLS); if (urls != null && !urls.isEmpty()) { html.append("<p><b>").append(i18n.getLocString("field.detaillinks")).append("</b></p>"); html.append("<ul>"); for (URL url : urls) { String urlStr = url.toString(); html.append("<li><a href=\"" + urlStr + "\">").append(urlStr).append("</a></li>"); } html.append("</ul>"); } html.append("<br/><br/><br/><br/><br/>"); } @Override public ExportResult print(Person person) { StringBuilder html = new StringBuilder(); html.append("<html><head><link rel=\"stylesheet\" type=\"text/css\" href=\"").append(styleSheet) .append("\"></head><body>"); html.append(generateListIcon("author")); html.append("<li>").append(createAuthorlink(person)).append("</li>"); html.append("</ul>"); html.append("</body></html>"); ExportResultText out = new ExportResultText(html); return out; } @Override public ExportResult print(Term term) { StringBuilder html = new StringBuilder(); html.append("<html><head><link rel=\"stylesheet\" type=\"text/css\" href=\"").append(styleSheet) .append("\"></head><body>"); html.append(generateListIcon("term")); printToHTMLescaped(html, "li", term.getTerm()); html.append("</ul>"); html.append("</body></html>"); ExportResultText out = new ExportResultText(html); return out; } private String escape(String string) { return StringEscapeUtils.escapeHtml(string); } /** * Returns a localized string that means "author" or "authors" (plural), * depending on how many authors are in the list. * * @param al * the author list to generate the label for * @return the localized label */ private String getAuthorFieldLabel(PersonList al) { String authorLabel = null; final boolean moreThanOneElementInList = (al.size() >= 2); if (moreThanOneElementInList) { authorLabel = i18n.getLocString("field.authors"); } else { authorLabel = i18n.getLocString("field.author"); } return authorLabel; } /** * Generates an ul tag with imageicons for listitems * * @param name * Defines an id for the css file and gets an icon depending on * the name * @return generated ul tag with id and icon */ private StringBuffer generateListIcon(String name) { StringBuffer tmp = new StringBuffer(); String iconPath = iconPath(name); tmp.append("<ul id =\"").append(name).append("\"").append(" style=\" list-style-image: url(") .append(iconPath).append(");\">"); return tmp; } /** * Calculates the path for an icon with the given name. * * @param name * the name of the icon (e.g. "author") * @return the full path for that icon (e.g. /tmp/...../author_16.png") */ protected String iconPath(String name) { String iconPath; iconPath = getClass().getResource("/icons/16x16/mime/" + name + "_16.png").toString(); return iconPath; } /** * Calculates the path for the CSS style sheet. * * @return the full path for the style sheet (e.g. * /tmp/...../detailView.css") */ protected String stylesheetPath() { return getClass().getResource("/detailView.css").toString(); } private String createAuthorlink(Person person) { String authorlink = person.getFirstName() + " " + person.getLastName(); try { return "<a href=\"ezdl://" + EzDLProtocolHandler.INTERNAL_QUERY + "?Author=%22" + URLEncoder.encode(person.getFirstName(), "UTF-8") + "+" + URLEncoder.encode(person.getLastName(), "UTF-8") + "%22\">" + authorlink + "</a>"; } catch (UnsupportedEncodingException e) { logger.error(e); } return authorlink; } /** * Appends a HTML tag surrounded String to the HTML output StringBuffer, * escaping the content. * * @param html * StringBuilder for HTML output * @param htmlTag * tag which surrounds the content string * @param content * string which has to be printed to HTML */ private void printToHTMLescaped(StringBuilder html, String htmlTag, String content) { html.append("<").append(htmlTag).append(">").append(escape(content)).append("</").append(htmlTag) .append(">"); } }