Java tutorial
/* * Solo - A small and beautiful blogging system written in Java. * Copyright (c) 2010-2018, b3log.org & hacpai.com * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero 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 Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <https://www.gnu.org/licenses/>. */ package org.b3log.solo.model.rss; import org.apache.commons.lang.StringEscapeUtils; import org.apache.commons.lang.time.DateFormatUtils; import org.b3log.latke.util.XMLs; import java.util.ArrayList; import java.util.Date; import java.util.List; /** * RSS 2.0 channel. * <p> * See <a href="http://cyber.law.harvard.edu/rss/rss.html">RSS 2.0 at Harvard Law</a> for more details. * </p> * * @author <a href="http://88250.b3log.org">Liang Ding</a> * @version 1.1.1.2, Aug 2, 2018 * @see Item * @see Category * @since 0.3.1 */ public final class Channel { /** * Start. */ private static final String START = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><rss version=\"2.0\" " + "xmlns:atom=\"http://www.w3.org/2005/Atom\"><channel>"; /** * End. */ private static final String END = "</channel></rss>"; /** * Start title element. */ private static final String START_TITLE_ELEMENT = "<title>"; /** * End title element. */ private static final String END_TITLE_ELEMENT = "</title>"; /** * Start link element. */ private static final String START_LINK_ELEMENT = "<link>"; /** * Atom link variable. */ private static final String ATOM_LINK_VARIABLE = "${atomLink}"; /** * End link element. */ private static final String END_LINK_ELEMENT = "</link>"; /** * Atom link element. */ private static final String ATOM_LINK_ELEMENT = "<atom:link href=\"" + ATOM_LINK_VARIABLE + "\" rel=\"self\" type=\"application/rss+xml\" />"; /** * Start description element. */ private static final String START_DESCRIPTION_ELEMENT = "<description>"; /** * End description element. */ private static final String END_DESCRIPTION_ELEMENT = "</description>"; /** * Start generator element. */ private static final String START_GENERATOR_ELEMENT = "<generator>"; /** * End generator element. */ private static final String END_GENERATOR_ELEMENT = "</generator>"; /** * Start language element. */ private static final String START_LANGUAGE_ELEMENT = "<language>"; /** * End language element. */ private static final String END_LANGUAGE_ELEMENT = "</language>"; /** * Start last build date element. */ private static final String START_LAST_BUILD_DATE_ELEMENT = "<lastBuildDate>"; /** * End last build date element. */ private static final String END_LAST_BUILD_DATE_ELEMENT = "</lastBuildDate>"; /** * Title. */ private String title; /** * Link. */ private String link; /** * Atom link. */ private String atomLink; /** * Description. */ private String description; /** * Generator. */ private String generator; /** * Last build date. */ private Date lastBuildDate; /** * Language. */ private String language; /** * Items. */ private List<Item> items = new ArrayList<>(); /** * Gets the atom link. * * @return atom link */ public String getAtomLink() { return atomLink; } /** * Sets the atom link with the specified atom link. * * @param atomLink the specified atom link */ public void setAtomLink(final String atomLink) { this.atomLink = atomLink; } /** * Gets the last build date. * * @return last build date */ public Date getLastBuildDate() { return lastBuildDate; } /** * Sets the last build date with the specified last build date. * * @param lastBuildDate the specified last build date */ public void setLastBuildDate(final Date lastBuildDate) { this.lastBuildDate = lastBuildDate; } /** * Gets generator. * * @return generator */ public String getGenerator() { return generator; } /** * Sets the generator with the specified generator. * * @param generator the specified generator */ public void setGenerator(final String generator) { this.generator = generator; } /** * Gets the link. * * @return link */ public String getLink() { return link; } /** * Sets the link with the specified link. * * @param link the specified link */ public void setLink(final String link) { this.link = link; } /** * Gets the title. * * @return title */ public String getTitle() { return title; } /** * Sets the title with the specified title. * * @param title the specified title */ public void setTitle(final String title) { this.title = title; } /** * Adds the specified item. * * @param item the specified item */ public void addItem(final Item item) { items.add(item); } /** * Gets the description. * * @return description */ public String getDescription() { return description; } /** * Sets the description with the specified description. * * @param description the specified description */ public void setDescription(final String description) { this.description = description; } /** * Gets the language. * * @return language */ public String getLanguage() { return language; } /** * Sets the language with the specified language. * * @param language the specified language */ public void setLanguage(final String language) { this.language = language; } @Override public String toString() { final StringBuilder stringBuilder = new StringBuilder(); stringBuilder.append(START); stringBuilder.append(START_TITLE_ELEMENT); stringBuilder.append(StringEscapeUtils.escapeXml(title)); stringBuilder.append(END_TITLE_ELEMENT); stringBuilder.append(START_LINK_ELEMENT); stringBuilder.append(StringEscapeUtils.escapeXml(link)); stringBuilder.append(END_LINK_ELEMENT); stringBuilder.append(ATOM_LINK_ELEMENT.replace(ATOM_LINK_VARIABLE, atomLink)); stringBuilder.append(START_DESCRIPTION_ELEMENT); stringBuilder.append(StringEscapeUtils.escapeXml(description)); stringBuilder.append(END_DESCRIPTION_ELEMENT); stringBuilder.append(START_GENERATOR_ELEMENT); stringBuilder.append(StringEscapeUtils.escapeXml(generator)); stringBuilder.append(END_GENERATOR_ELEMENT); stringBuilder.append(START_LAST_BUILD_DATE_ELEMENT); stringBuilder.append(DateFormatUtils.SMTP_DATETIME_FORMAT.format(lastBuildDate)); stringBuilder.append(END_LAST_BUILD_DATE_ELEMENT); stringBuilder.append(START_LANGUAGE_ELEMENT); stringBuilder.append(StringEscapeUtils.escapeXml(language)); stringBuilder.append(END_LANGUAGE_ELEMENT); for (final Item item : items) { stringBuilder.append(item.toString()); } stringBuilder.append(END); return XMLs.format(stringBuilder.toString()); } }