Mustache.java

/*
 * Copyright (c) 2012 S.C. Axemblr Software Solutions S.R.L
 *
 * 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.axemblr.provisionr.core;

import com.github.mustachejava.DefaultMustacheFactory;
import com.github.mustachejava.MustacheFactory;
import com.google.common.base.Charsets;
import com.google.common.io.Resources;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.StringReader;
import java.io.Writer;
import java.net.URL;
import java.util.Map;

/**
 * Utility functions for rendering mustache templates as strings
 */
public class Mustache {

    private Mustache() {
    }

    public static String toString(Class<?> contextClass, String resource, Map<String, ?> scopes)
        throws IOException {
        return toString(Resources.getResource(contextClass, resource), scopes);
    }

    public static String toString(URL resource, Map<String, ?> scopes) throws IOException {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        Writer writer = new OutputStreamWriter(outputStream);

        String content = Resources.toString(resource, Charsets.UTF_8);

        MustacheFactory factory = new DefaultMustacheFactory();
        factory.compile(new StringReader(content), resource.toString())
            .execute(writer, scopes);

        writer.close();
        return outputStream.toString();
    }

}