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Utilities to deal with emails in Spring Boot using Pebble templating engine

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/*
 * Copyright 2012-2015 the original author or authors.
 *
 * 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 it.ozimov.springboot.templating.mail.service;

import com.mitchellbosecke.pebble.PebbleEngine;
import com.mitchellbosecke.pebble.error.PebbleException;
import com.mitchellbosecke.pebble.spring4.PebbleViewResolver;
import com.mitchellbosecke.pebble.template.PebbleTemplate;
import it.ozimov.springboot.templating.mail.service.exception.TemplateException;
import lombok.NonNull;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Map;
import java.util.Objects;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Strings.isNullOrEmpty;
import static com.google.common.io.Files.getFileExtension;

@Service
public class PebbleTemplateService implements TemplateService {

    @Autowired
    private PebbleViewResolver pebbleViewResolver;

    @Autowired
    private PebbleEngine pebbleEngine;

    @Value("${pebble.suffix:pebble}")
    private String pebbleSuffix;

    @Override
    public
    @NonNull
    String mergeTemplateIntoString(final @NonNull String templateReference,
                                   final @NonNull Map model)
            throws IOException, TemplateException {
        checkArgument(!isNullOrEmpty(templateReference.trim()), "The given templateName is null, empty or blank");
        checkArgument(Objects.equals(getFileExtension(templateReference), expectedTemplateExtension()),
                "Expected a Pebble template file with extension '%s', while '%s' was given. To check " +
                        "the default extension look at 'pebble.suffix' in your application.properties file",
                expectedTemplateExtension(), getFileExtension(templateReference));

        try {
            final PebbleTemplate template = pebbleEngine.getTemplate(normalizeTemplateReference(templateReference));
            final Writer writer = new StringWriter();
            template.evaluate(writer, model);
            return writer.toString();
        } catch (Exception e) {
            throw new TemplateException(e);
        }
    }

    @Override
    public String expectedTemplateExtension() {
        return pebbleSuffix.replace(".", "");
    }

    private String normalizeTemplateReference(final String templateReference) {
        final String expectedSuffix = ("." + pebbleSuffix).replace("..", ".");
        return templateReference.substring(0, templateReference.lastIndexOf(expectedSuffix));
    }

}