| /* |
| * Copyright (C) 2010 Google Inc. |
| * |
| * 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. |
| */ |
| |
| package com.google.clearsilver.jsilver.compatibility; |
| |
| import com.google.clearsilver.jsilver.TemplateRenderer; |
| import com.google.clearsilver.jsilver.template.Template; |
| import com.google.clearsilver.jsilver.data.Data; |
| import com.google.clearsilver.jsilver.exceptions.JSilverException; |
| import com.google.clearsilver.jsilver.resourceloader.ResourceLoader; |
| |
| import org.clearsilver.CS; |
| import org.clearsilver.CSFileLoader; |
| import org.clearsilver.ClearsilverFactory; |
| import org.clearsilver.HDF; |
| import org.clearsilver.jni.JniClearsilverFactory; |
| |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.Reader; |
| |
| /** |
| * A {@link TemplateRenderer} implemented using ClearSilver itself. |
| */ |
| public class ClearsilverRenderer implements TemplateRenderer { |
| private final ClearsilverFactory factory; |
| private final ResourceLoader defaultResourceLoader; |
| |
| /** |
| * Creates an implementation using the provided ClearSilver factory and JSilver resource loader. |
| */ |
| public ClearsilverRenderer(ClearsilverFactory factory, ResourceLoader resourceLoader) { |
| this.factory = factory; |
| this.defaultResourceLoader = resourceLoader; |
| } |
| |
| /** |
| * Creates a JSilver implementation using the JNI ClearSilver factory and provided JSilver |
| * resource loader. |
| */ |
| public ClearsilverRenderer(ResourceLoader resourceLoader) { |
| this(new JniClearsilverFactory(), resourceLoader); |
| } |
| |
| @Override |
| public void render(String templateName, Data data, Appendable output, |
| final ResourceLoader resourceLoader) throws IOException, JSilverException { |
| CSFileLoader fileLoader = new CSFileLoader() { |
| @Override |
| public String load(HDF hdf, String filename) throws IOException { |
| return loadResource(filename, resourceLoader); |
| } |
| }; |
| |
| HDF hdf = factory.newHdf(); |
| try { |
| // Copy the Data into the HDF. |
| hdf.readString(data.toString()); |
| |
| CS cs = factory.newCs(hdf); |
| try { |
| cs.setFileLoader(fileLoader); |
| cs.parseFile(templateName); |
| output.append(cs.render()); |
| } finally { |
| cs.close(); |
| } |
| } finally { |
| hdf.close(); |
| } |
| } |
| |
| @Override |
| public void render(String templateName, Data data, Appendable output) throws IOException, |
| JSilverException { |
| render(templateName, data, output, defaultResourceLoader); |
| } |
| |
| @Override |
| public String render(String templateName, Data data) throws IOException, JSilverException { |
| Appendable output = new StringBuilder(8192); |
| render(templateName, data, output); |
| return output.toString(); |
| } |
| |
| @Override |
| public void render(Template template, Data data, Appendable output, ResourceLoader resourceLoader) |
| throws IOException, JSilverException { |
| throw new UnsupportedOperationException("ClearsilverRenderer only expects " |
| + "template names, not Templates"); |
| } |
| |
| @Override |
| public void render(Template template, Data data, Appendable output) throws IOException, |
| JSilverException { |
| render(template, data, output, defaultResourceLoader); |
| } |
| |
| @Override |
| public String render(Template template, Data data) throws IOException, JSilverException { |
| Appendable output = new StringBuilder(8192); |
| render(template, data, output); |
| return output.toString(); |
| } |
| |
| @Override |
| public void renderFromContent(String content, Data data, Appendable output) throws IOException, |
| JSilverException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public String renderFromContent(String content, Data data) throws IOException, JSilverException { |
| Appendable output = new StringBuilder(8192); |
| renderFromContent(content, data, output); |
| return output.toString(); |
| } |
| |
| /** |
| * @return the contents of a resource, or null if the resource was not found. |
| */ |
| private String loadResource(String filename, ResourceLoader resourceLoader) throws IOException { |
| Reader reader = resourceLoader.open(filename); |
| if (reader == null) { |
| throw new FileNotFoundException(filename); |
| } |
| StringBuilder sb = new StringBuilder(); |
| char buf[] = new char[4096]; |
| int count; |
| while ((count = reader.read(buf)) != -1) { |
| sb.append(buf, 0, count); |
| } |
| return sb.toString(); |
| } |
| } |