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/**
 * Copyright (c) 2005-2015 Zauber S.A. 
 *
 * Licensed 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 ar.com.zauber.commons.dao;

import java.io.InputStream;
import java.util.Date;


/**
 * Interface for a resource descriptor that abstracts from the actual
 * type of underlying resource, such as a file or class path resource.
 *
 * An InputStream can be opened for every resource if it exists in
 * physical form, but a URL or File handle can just be returned for
 * certain resources. The actual behavior is implementation-specific.
 * 
 * @author Juan F. Codagnone
 * @since Nov 19, 2005
 */
public interface Resource {

    /** @return the resource. can be null */
    String getName();
    
    /** @return a stream for the resource */
    InputStream getInputStream();

    /**
     * @return the last-modified timestamp for this resource.
     * or null if can't be determined
     */
    Date getLastModified();
}