mail template

MailTemplateCreator

package com.sample.utils.mail;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.io.IOUtils;


/**
 * 
 * @author brunofuster
 *
 */
public class MailTemplateCreator {

	private String template;
	private Map<String, Object> map;
	
	private MailTemplateCreator(MailTemplate mailTemplate, String language) throws IOException {
		
		/* TODO FIXME cache file templates, do not read them all the time */
		String filepath = String.format("/mailTemplates/%1$s/%2$s", language, mailTemplate.file());
		BufferedReader reader = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream(filepath)));
		
		this.template = IOUtils.toString(reader);		
		this.map = new HashMap<String, Object>();
	}
	
	public MailTemplateCreator put(String key, Object value) {
		
		map.put(key, value);
		return this;
	}
	
	public String parse() {
		
		Iterator<String> keys = map.keySet().iterator();
		String newtemplate = new String(template.toString());
		
		while (keys.hasNext()) {
			
			String key = keys.next();
			newtemplate = newtemplate.replaceAll(Pattern.quote("{" + key + "}"), 
					Matcher.quoteReplacement(map.get(key).toString()));
		}
		
		return newtemplate;
	}
	
	//factory method
	public static MailTemplateCreator someTemplate(String language) {
		return new MailTemplateCreator(MailTemplate.SOME_TEMPLATE, language);
	}

	private enum MailTemplate {
		
		SOME_TEMPLATE("template1.mytpl"),
		ANOTHER_TEMPLATE("template2.mytpl");
		
		private String file;
		private MailTemplate(String file) {
			this.file = file;
		}
		public String file() { return this.file; }
	}
}