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KnowGate HTTP, HTML, XSLT and CSS utilities

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package com.knowgate.xhtml;

/**
 * © Copyright 2016 the original author.
 * This file is licensed under the Apache License version 2.0.
 * 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.
 */

import java.io.File;
import java.io.IOException;

import java.util.WeakHashMap;

import org.lesscss.LessCompiler;
import org.lesscss.LessException;

/**
 * LESS CSS caching using in-memory WeakHashMap
 * @author Sergio Montoro Ten
 * @see lesscss.org
 */
public class LESSCache extends WeakHashMap {

	/**
	 * Convert a LESS CSS file into plain CSS
	 * @param lcssFile File with LESS CSS
	 * @return String CSS source code
	 * @throws LessException
	 * @throws IOException
	 */
	public String render(File lcssFile) throws LessException, IOException {
		final String sFilePath = lcssFile.getAbsolutePath();
		String sRetCSS = null;
		if (containsKey(sFilePath)) {
			sRetCSS = get(sFilePath);
		} else {
			LessCompiler oLssC = null;
			try {
				oLssC = new LessCompiler();
				oLssC.setCompress(true);
				sRetCSS = oLssC.compile(lcssFile);
				put(sFilePath, sRetCSS);
			} finally {
				if (oLssC != null)
					oLssC.close();
			}
		}
		return sRetCSS;
	} // render

}