MimeTypeGuesser.java

/*******************************************************************************
 * Copyright (c) 2004, 2013 Steve Flasby
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * <ul>
 *     <li>Redistributions of source code must retain the above copyright notice,
 *         this list of conditions and the following disclaimer.</li>
 *     <li>Redistributions in binary form must reproduce the above copyright notice,
 *         this list of conditions and the following disclaimer in the documentation
 *         and/or other materials provided with the distribution.</li>
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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package org.flasby.net;

import java.util.HashMap;
import java.util.Map;

import static org.flasby.net.MimeType.*;

/*
 * @author Steve Flasby
 * Aug 3, 2012
 */

public class MimeTypeGuesser {

	private static final long TEN_DAYS = 10 * 24 * 60 * 60 * 1000;
	private static final long TEN_MINUTES = 10 * 24 * 60 * 1000;
	
	public static class MimeInfo {
		public MimeInfo(MimeType mimeType, long defaultCachePeriod) {
			this.mimeType = mimeType;
			this.defaultCachePeriod = defaultCachePeriod;
		}
		public final MimeType mimeType;
		public final long defaultCachePeriod;
	}
	private static final Map<String, MimeInfo> MIMES = new HashMap<String, MimeInfo>();
	static {
		MIMES.put(".png", new MimeInfo( PNG, TEN_DAYS) );
		MIMES.put(".gif", new MimeInfo( GIF, TEN_DAYS) );
		MIMES.put(".js",  new MimeInfo( JS, TEN_MINUTES) );
		MIMES.put(".css", new MimeInfo( CSS, TEN_DAYS) );
	}
	
	public static MimeInfo getMimeTypeFor( String name, MimeType defaultValue ) {
		MimeInfo ret =  MIMES.get(name.substring(name.lastIndexOf('.')));
		if ( ret==null ) return new MimeInfo(defaultValue , TEN_MINUTES );
		return ret;
	}
}