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Resource merging for Apache Wicket (http://wicket.apache.org), see http://talk-on-tech.blogspot.com/2008/08/wicket-interface-speed-up-merging.html

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/**
 * Copyright 2010 Molindo GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * 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.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.wicketstuff.mergedresources.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.StringReader;
import java.io.StringWriter;
import java.nio.charset.Charset;

import com.yahoo.platform.yui.compressor.CssCompressor;

public class YuiCompressorUtil {
	private static final transient org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(YuiCompressorUtil.class);

	private YuiCompressorUtil() {
		// no instances
	}

	public static String compress(final String toCompress) {
		final StringWriter writer = new StringWriter((int) (toCompress.length() * 0.8));
		try {
			new CssCompressor(new StringReader(toCompress)).compress(writer, 0);
		} catch (final Exception e) {
			log.warn("Could not compress merged CSS stream, using uncompressed content", e);
			return toCompress;
		}
		return writer.toString();
	}

	public static byte[] compress(final byte[] toCompress, Charset charset) {
		ByteArrayOutputStream out = new ByteArrayOutputStream(toCompress.length);

		final OutputStreamWriter writer = new OutputStreamWriter(out);
		try {
			new CssCompressor(new InputStreamReader(new ByteArrayInputStream(toCompress), charset)).compress(writer, 0);
			writer.flush();
			writer.close();
		} catch (final Exception e) {
			log.warn("Could not compress merged CSS stream, using uncompressed content", e);
			return toCompress;
		}
		return out.toByteArray();
	}
}