org.apache.wicket.request.resource.CssPackageResource Maven / Gradle / Ivy

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Wicket is a Java web application framework that takes simplicity, separation of concerns and ease of development to a whole new level. Wicket pages can be mocked up, previewed and later revised using standard WYSIWYG HTML design tools. Dynamic content processing and form handling is all handled in Java code using a first-class component model backed by POJO data beans that can easily be persisted using your favorite technology.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.wicket.request.resource;

import java.util.Locale;

import org.apache.wicket.Application;
import org.apache.wicket.css.ICssCompressor;
import org.apache.wicket.resource.IScopeAwareTextResourceProcessor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Package resource for css files. It strips comments and whitespace from css.
 */
public class CssPackageResource extends PackageResource
{
	private static final long serialVersionUID = 1L;

	private static final Logger log = LoggerFactory.getLogger(CssPackageResource.class);

	private final String name;

	/**
	 * Construct.
	 * 
	 * @param scope
	 * @param name
	 * @param locale
	 * @param style
	 * @param variation
	 */
	public CssPackageResource(Class scope, String name, Locale locale, String style,
		String variation)
	{
		super(scope, name, locale, style, variation);

		this.name = name;

		// CSS resources can be compressed if there is configured ICssCompressor
		setCompress(true);
	}

	@Override
	protected byte[] processResponse(final Attributes attributes, final byte[] bytes)
	{
		final byte[] processedResponse = super.processResponse(attributes, bytes);

		ICssCompressor compressor = getCompressor();

		if (compressor != null && getCompress())
		{
			try
			{
				String charsetName = "UTF-8";
				String nonCompressed = new String(processedResponse, charsetName);
				String output;
				if (compressor instanceof IScopeAwareTextResourceProcessor)
				{
					IScopeAwareTextResourceProcessor scopeAwareProcessor = (IScopeAwareTextResourceProcessor)compressor;
					output = scopeAwareProcessor.process(nonCompressed, getScope(), name);
				}
				else
				{
					output = compressor.compress(nonCompressed);
				}
				return output.getBytes(charsetName);
			}
			catch (Exception e)
			{
				log.error("Error while filtering content", e);
				return processedResponse;
			}
		}
		else
		{
			// don't strip the comments
			return processedResponse;
		}
	}

	/**
	 * Gets the {@link ICssCompressor} to be used. By default returns the configured compressor on
	 * application level, but can be overriden by the user application to provide compressor
	 * specific to the resource.
	 * 
	 * @return the configured application level Css compressor. May be {@code null}.
	 */
	protected ICssCompressor getCompressor()
	{
		ICssCompressor compressor = null;
		if (Application.exists())
		{
			compressor = Application.get().getResourceSettings().getCssCompressor();
		}
		return compressor;
	}

}