Java tutorial
/* * #%L * ********************************************************************************************************************* * * NorthernWind - lightweight CMS * http://northernwind.tidalwave.it - git clone https://bitbucket.org/tidalwave/northernwind-src.git * %% * Copyright (C) 2011 - 2016 Tidalwave s.a.s. (http://tidalwave.it) * %% * ********************************************************************************************************************* * * 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. * * ********************************************************************************************************************* * * $Id$ * * ********************************************************************************************************************* * #L% */ package it.tidalwave.northernwind.frontend.ui.component.htmltemplate; import javax.annotation.Nonnull; import javax.inject.Inject; import javax.inject.Provider; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; import java.io.Reader; import java.nio.CharBuffer; import org.springframework.beans.factory.annotation.Configurable; import org.springframework.core.io.ClassPathResource; import org.springframework.core.io.Resource; import org.stringtemplate.v4.ST; import it.tidalwave.util.Id; import it.tidalwave.northernwind.core.model.SiteProvider; import it.tidalwave.northernwind.frontend.ui.SiteViewController; import lombok.Cleanup; import lombok.Getter; import lombok.Setter; import lombok.ToString; import lombok.extern.slf4j.Slf4j; /*********************************************************************************************************************** * * The HtmlTemplate specialization of {@link SiteViewController}. * * @author Fabrizio Giudici * @version $Id$ * **********************************************************************************************************************/ @Configurable @Slf4j @ToString(exclude = "siteProvider") public class TextHolder { private final Map<String, String> attributeMap = new HashMap<String, String>(); private final List<TextHolder> contents = new ArrayList<TextHolder>(); @Getter @Setter private String template; @Inject private Provider<SiteProvider> siteProvider; @Getter @Setter private String mimeType = "text/plain"; /******************************************************************************************************************* * * Creates an instance with the given name. * * @param name the component name * ******************************************************************************************************************/ public TextHolder(final @Nonnull Id id) { attributeMap.put("content", ""); try { loadTemplate(); } catch (IOException e) { throw new RuntimeException(e); } } public TextHolder(final @Nonnull String html) { addAttribute("content", html); template = "$content$"; } // @Override public void setContent(final @Nonnull String content) { addAttribute("content", content); // setValue(html); } public void addComponent(final @Nonnull TextHolder child) { contents.add(child); } public void addAttribute(final @Nonnull String name, final @Nonnull String value) { attributeMap.put(name, value); } @Nonnull public byte[] asBytes(final @Nonnull String charset) throws IOException { return asString(charset).getBytes(charset); } @Nonnull public String asString(final @Nonnull String charset) throws IOException { ST t = new ST(template, '$', '$'); for (final Entry<String, String> entry : attributeMap.entrySet()) { t = t.add(entry.getKey(), entry.getValue()); } final StringBuilder builder = new StringBuilder(); for (final TextHolder child : contents) { builder.append(child.asString(charset)).append("\n"); } t = t.add("content", builder.toString()); t = t.add("contextPath", siteProvider.get().getSite().getContextPath()); t = t.add("charset", charset); t = t.add("language", ""); return t.render(); } private void loadTemplate() throws IOException { // FIXME: this should be done only once... Resource resource = null; for (Class<?> clazz = getClass(); clazz.getSuperclass() != null; clazz = clazz.getSuperclass()) { final String templateName = clazz.getSimpleName() + ".txt"; resource = new ClassPathResource(templateName, clazz); if (resource.exists()) { break; } } try { if (resource == null) { throw new FileNotFoundException(); } final @Cleanup Reader r = new InputStreamReader(resource.getInputStream()); final CharBuffer charBuffer = CharBuffer.allocate((int) resource.contentLength()); final int length = r.read(charBuffer); r.close(); template = new String(charBuffer.array(), 0, length); } catch (FileNotFoundException e) // no specific template, fallback { log.warn("No template for {}, using default", getClass().getSimpleName()); template = "$content$\n"; } } }