/*
* 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();
}
}