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package cn.dreampie.common.web.resource;

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

/**
 * Created by wangrenhui on 2014/7/11.
 */
public interface Resource {

  /**
   * Tests if resource exists.
   *
   * @return true if resource exists.
   */
  boolean exists();

  /**
   * Returns the time that the FILE source was last modified.
   *
   * @return A long value representing the time the resource was last modified, measured in milliseconds
   * since the epoch (00:00:00 GMT, January 1, 1970).
   */
  long lastModified();

  /**
   * Returns resource input stream.
   *
   * @return inputstream
   * @throws java.io.IOException exception
   */
  InputStream getInputStream() throws IOException;

  /**
   * Creates relative resource for current resource.
   *
   * @param relativeResourcePath String relative resource path
   * @return Resource relative resource
   * @throws java.io.IOException exception
   */
  Resource createRelative(String relativeResourcePath) throws IOException;

  /**
   * Returns a unique name for this resource. (ie file name for files)
   *
   * @return the name of the resource
   */
  String getName();
}