com.agnie.common.email.MessageTemplate.java Source code

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Here is the source code for com.agnie.common.email.MessageTemplate.java

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/*******************************************************************************
 * Copyright (c) 2014 Agnie Technologies.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Agnie Technologies - initial API and implementation
 ******************************************************************************/
package com.agnie.common.email;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Map;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.text.StrSubstitutor;

public class MessageTemplate {

    // template file name
    private String template;
    // Location of configuration path
    private String configPath;

    // contents of the template file
    private String messageTemplate;

    /**
     * @param template
     * @param configPath
     */
    public MessageTemplate(String template, String configPath) {
        this.template = template;
        this.configPath = configPath;
    }

    public MessageTemplate(String template) {

        this.template = template;
    }

    /**
     * read the contents of the template on its first use.
     * 
     * @throws IOException
     */
    private synchronized void init() throws IOException {

        if (messageTemplate == null) {
            if (configPath == null || configPath.isEmpty()) {
                messageTemplate = IOUtils.toString(getClass().getResource("/" + template));
            } else {
                messageTemplate = IOUtils.toString(new FileInputStream(new File(configPath + "/" + template)));
            }
        }
    }

    /**
     * Generate the message from template by replacing variable values inside template.
     * 
     * @param valuesMap
     * @return
     * @throws IOException
     */
    public String getMessage(Map<String, String> valuesMap) throws IOException {

        if (messageTemplate == null) {
            init();
        }
        StrSubstitutor sub = new StrSubstitutor(valuesMap);
        return sub.replace(messageTemplate);
    }

}