org.eclipse.che.mail.template.ST.STTemplateProcessorImpl.java Source code

Introduction

Here is the source code for org.eclipse.che.mail.template.ST.STTemplateProcessorImpl.java

Source

/*
 * Copyright (c) 2012-2018 Red Hat, Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Red Hat, Inc. - initial API and implementation
 */
package org.eclipse.che.mail.template.ST;

import com.google.common.io.CharStreams;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.Map;
import javax.inject.Singleton;
import org.eclipse.che.commons.lang.IoUtil;
import org.eclipse.che.mail.template.Template;
import org.eclipse.che.mail.template.TemplateProcessor;
import org.eclipse.che.mail.template.exception.TemplateException;
import org.eclipse.che.mail.template.exception.TemplateNotFoundException;
import org.stringtemplate.v4.ST;

/**
 * {@link TemplateProcessor} implementation based on {@link ST}.
 *
 * @author Sergii Leshchenko
 */
@Singleton
public class STTemplateProcessorImpl implements TemplateProcessor {

    @Override
    public String process(String templateName, Map<String, Object> variables) throws TemplateException {
        ST st = new ST(resolve(templateName));
        variables.forEach(st::add);
        return st.render();
    }

    @Override
    public String process(Template template) throws TemplateException {
        return process(template.getName(), template.getAttributes());
    }

    private String resolve(String template) throws TemplateNotFoundException {
        try (Reader reader = new InputStreamReader(IoUtil.getResource(template))) {
            return CharStreams.toString(reader);
        } catch (IOException e) {
            throw new TemplateNotFoundException(e.getMessage(), e);
        }
    }
}