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Mustache Template Engine implementation for Spark

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/*
 * Copyright 2014
 *
 *  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 spark.template.mustache;

import java.io.IOException;
import java.io.StringWriter;

import org.eclipse.jetty.io.RuntimeIOException;

import spark.ModelAndView;
import spark.TemplateEngine;

import com.github.mustachejava.DefaultMustacheFactory;
import com.github.mustachejava.Mustache;
import com.github.mustachejava.MustacheFactory;

/**
 * Defaults to the 'templates' directory under the resource path.
 *
 * @author Sam Pullara https://github.com/spullara
 */
public class MustacheTemplateEngine extends TemplateEngine {

    private MustacheFactory mustacheFactory;

    /**
     * Constructs a mustache template engine
     */
    public MustacheTemplateEngine() {
        mustacheFactory = new DefaultMustacheFactory("templates");
    }

    /**
     * Constructs a mustache template engine
     *
     * @param resourceRoot the resource root
     */
    public MustacheTemplateEngine(String resourceRoot) {
        mustacheFactory = new DefaultMustacheFactory(resourceRoot);
    }

    /**
     * Constructs a mustache template engine
     *
     * @param mustacheFactory the mustache factory
     */
    public MustacheTemplateEngine(MustacheFactory mustacheFactory) {
        this.mustacheFactory = mustacheFactory;
    }

    @Override
    public String render(ModelAndView modelAndView) {
        String viewName = modelAndView.getViewName();
        Mustache mustache = mustacheFactory.compile(viewName);
        StringWriter stringWriter = new StringWriter();
        try {
            mustache.execute(stringWriter, modelAndView.getModel()).close();
        } catch (IOException e) {
            throw new RuntimeIOException(e);
        }
        return stringWriter.toString();
    }
}