Package com.github.dandelion.extras.yui.asset.processor

Source Code of com.github.dandelion.extras.yui.asset.processor.CssMinYuiProcessor

/*
* [The "BSD licence"]
* Copyright (c) 2013-2014 Dandelion
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of Dandelion nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.github.dandelion.extras.yui.asset.processor;

import java.io.IOException;
import java.io.Reader;
import java.io.Writer;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.github.dandelion.core.DandelionException;
import com.github.dandelion.core.asset.AssetType;
import com.github.dandelion.core.asset.processor.CompatibleAssetType;
import com.github.dandelion.core.asset.processor.ProcessingContext;
import com.github.dandelion.core.asset.processor.spi.AbstractAssetProcessor;
import com.yahoo.platform.yui.compressor.CssCompressor;

/**
* <p>
* CSS compressor based on YUI compressor.
*
* @author Thibault Duchateau
* @since 0.10.0
*/
@CompatibleAssetType(types = AssetType.css)
public class CssMinYuiProcessor extends AbstractAssetProcessor {

  private static final Logger LOG = LoggerFactory.getLogger(CssMinYuiProcessor.class);

  @Override
  public String getProcessorKey() {
    return "cssminyui";
  }

  @Override
  protected void doProcess(Reader reader, Writer writer, ProcessingContext processingContext) throws Exception {

    try {
      CssCompressor compressor = new CssCompressor(reader);
      compressor.compress(writer, -1);
    }
    catch (IOException e) {
      LOG.error("YUI compressor can't access to the content of {}", processingContext.getAsset().toLog());
      throw DandelionException.wrap(e);
    }
  }
}
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