001    // Copyright 2011 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    // http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.services.assets;
016    
017    import org.apache.tapestry5.ioc.annotations.UsesMappedConfiguration;
018    
019    /**
020     * Identifies which content types are compressable. In general, content types are assumed to be compressable. The
021     * configuration of the service identifies exceptions, which are usually image file formats.
022     * <p>
023     * The configuration maps content types to boolean values (true for compressable).
024     * 
025     * @since 5.3
026     */
027    @UsesMappedConfiguration(boolean.class)
028    public interface CompressionAnalyzer
029    {
030        /**
031         * For a given MIME type, is the content compressable via GZip?
032         * 
033         * @param contentType
034         *            MIME content type, possibly included attributes such as encoding type
035         * @return true if the content is not "naturally" compressed
036         */
037        boolean isCompressable(String contentType);
038    }