001    // Copyright 2010, 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    /**
018     * Encapsulates the logic or creating the path portion of an asset URL, including
019     * the application version.
020     * 
021     * @since 5.2.0
022     */
023    public interface AssetPathConstructor
024    {
025        /**
026         * Constructs an asset URL path from the virtual folder and path (within the virtual folder).
027         * 
028         * @param virtualFolder
029         *            corresponds to a {@link AssetRequestHandler} contributed to the AssetDispatcher service
030         * @param path
031         *            within the virtual folder (should <em>not</em> start with a slash)
032         * @return path portion of asset URL, including the context path, the /assets/ virtual folder, the application
033         *         version number,
034         *         the virtual folder, and the path extension
035         */
036        String constructAssetPath(String virtualFolder, String path);
037    }