    001    // Copyright 2009, 2010 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.internal.services;
    016
    017    import java.io.IOException;
    018
    019    import org.apache.tapestry5.ioc.Resource;
    020
    021    /**
    022     * Responsible for converting a path into a {@link org.apache.tapestry5.ioc.Resource} that can be
    023     * {@linkplain org.apache.tapestry5.internal.services.ResourceStreamer
    024     * streamed to the client}. The path is on the classpath, but may have been changed to include a checksum (in
    025     * certain cases).
    026     *
    027     * @since 5.1.0.2
    028     */
    029    public interface AssetResourceLocator
    030    {
    031        /**
    032         * For a complete classpath path, returns the Resource for the path. This include checking for a
    033         * digest for protected files.
    034         *
    035         * @return
    036         *         resource corresponding to path (may be for a non-existent resource), or null if path is invalid (i.e.,
    037         *         incorrect digest)
    038         */
    039        Resource findClasspathResourceForPath(String path) throws IOException;
    040    }