/*
 * Janino - An embedded Java[TM] compiler
 *
 * Copyright (c) 2001-2010, Arno Unkrig
 * 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. The name of the author may not 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 org.codehaus.janino.util.resource;

import java.io.IOException;
import java.io.InputStream;


/**
 * A {@link Resource} is "something" that is typically found by a
 * {@link org.codehaus.janino.util.resource.ResourceFinder}, can be {@link #open()}ed for
 * reading, and optionally has a {@link #lastModified()} property.
 * <p>
 * There also exists a {@link org.codehaus.janino.util.resource.ResourceCreator} concept which
 * opens a resource for writing, but that happens directly and not through an intermediate
 * {@link Resource} object.
 *
 * @see org.codehaus.janino.util.resource.ResourceFinder
 * @see org.codehaus.janino.util.resource.ResourceCreator
 */
public
interface Resource {

    /** Opens the resource. The caller is responsible for closing the {@link java.io.InputStream}. */
    InputStream open() throws IOException;

    /**
     * Returns a decorative "file name" that can be used for reporting
     * errors and the like. It does not necessarily map to a file in the
     * local file system!
     */
    String getFileName();

    /**
     * Returns the time of the last modification, in milliseconds since
     * 1970, or <code>0L</code> if the time of the last modification cannot
     * be determined.
     */
    long lastModified();
}