org.eclipse.jetty.util.resource

## Class Resource

- java.lang.Object
- - org.eclipse.jetty.util.resource.Resource

- All Implemented Interfaces:
    ResourceFactory
  Direct Known Subclasses:
    ResourceCollection, URLResource

      public abstract class Resource
      extends Object
      implements ResourceFactory

  Abstract resource class.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static boolean` | `__defaultUseCaches`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Resource()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `abstract Resource` | `addPath(String path)` Returns the resource contained inside the current resource with the given name.
    `void` | `copyTo(File destination)`
    `abstract boolean` | `delete()` Deletes the given resource
    `String` | `encode(String uri)` Encode according to this resource type.
    `abstract boolean` | `exists()` Returns true if the respresened resource exists.
    `protected void` | `finalize()`
    `URL` | `getAlias()`
    `Object` | `getAssociate()`
    `static boolean` | `getDefaultUseCaches()`
    `abstract File` | `getFile()` Returns an File representing the given resource or NULL if this is not possible.
    `abstract InputStream` | `getInputStream()` Returns an input stream to the resource
    `String` | `getListHTML(String base, boolean parent)` Get the resource list as a HTML directory listing.
    `abstract String` | `getName()` Returns the name of the resource
    `abstract OutputStream` | `getOutputStream()` Returns an output stream to the resource
    `Resource` | `getResource(String path)` Get a resource from withing this resource.
    `URI` | `getURI()` Returns an URI representing the given resource
    `abstract URL` | `getURL()` Returns an URL representing the given resource
    `String` | `getWeakETag()`
    `abstract boolean` | `isContainedIn(Resource r)`
    `static boolean` | `isContainedIn(Resource r, Resource containingResource)`
    `abstract boolean` | `isDirectory()` Returns true if the respresenetd resource is a container/directory.
    `abstract long` | `lastModified()` Returns the last modified time
    `abstract long` | `length()` Return the length of the resource
    `abstract String[]` | `list()` Returns a list of resource names contained in the given resource The resource names are not URL encoded.
    `static Resource` | `newClassPathResource(String resource)` Find a classpath resource.
    `static Resource` | `newClassPathResource(String name, boolean useCaches, boolean checkParents)` Find a classpath resource.
    `static Resource` | `newResource(File file)`
    `static Resource` | `newResource(String resource)` Construct a resource from a string.
    `static Resource` | `newResource(String resource, boolean useCaches)` Construct a resource from a string.
    `static Resource` | `newResource(URI uri)` Construct a resource from a uri.
    `static Resource` | `newResource(URL url)` Construct a resource from a url.
    `static Resource` | `newSystemResource(String resource)` Construct a system resource from a string.
    `abstract void` | `release()` Release any temporary resources held by the resource.
    `abstract boolean` | `renameTo(Resource dest)` Rename the given resource
    `void` | `setAssociate(Object o)`
    `static void` | `setDefaultUseCaches(boolean useCaches)` Change the default setting for url connection caches.
    `static URL` | `toURL(File file)` Generate a properly encoded URL from a `File` instance.
    `void` | `writeTo(OutputStream out, long start, long count)`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### __defaultUseCaches

          public static boolean __defaultUseCaches

  - ### Constructor Detail

    - #### Resource

          public Resource()

  - ### Method Detail

    - #### setDefaultUseCaches

          public static void setDefaultUseCaches(boolean useCaches)

      Change the default setting for url connection caches. Subsequent URLConnections will use this default.
      Parameters:
        `useCaches` -

    - #### getDefaultUseCaches

          public static boolean getDefaultUseCaches()

    - #### newResource

          public static Resource newResource(URI uri)
                                      throws IOException

      Construct a resource from a uri.
      Parameters:
        `uri` - A URI.
      Returns:
        A Resource object.
      Throws:
        `IOException` - Problem accessing URI

    - #### newResource

          public static Resource newResource(URL url)
                                      throws IOException

      Construct a resource from a url.
      Parameters:
        `url` - A URL.
      Returns:
        A Resource object.
      Throws:
        `IOException` - Problem accessing URL

    - #### newResource

          public static Resource newResource(String resource)
                                      throws MalformedURLException,
                                             IOException

      Construct a resource from a string.
      Parameters:
        `resource` - A URL or filename.
      Returns:
        A Resource object.
      Throws:
        `MalformedURLException`
        `IOException`

    - #### newResource

          public static Resource newResource(String resource,
                             boolean useCaches)
                                      throws MalformedURLException,
                                             IOException

      Construct a resource from a string.
      Parameters:
        `resource` - A URL or filename.
        `useCaches` - controls URLConnection caching
      Returns:
        A Resource object.
      Throws:
        `MalformedURLException`
        `IOException`

    - #### newResource

          public static Resource newResource(File file)
                                      throws MalformedURLException,
                                             IOException

      Throws:
        `MalformedURLException`
        `IOException`

    - #### newSystemResource

          public static Resource newSystemResource(String resource)
                                            throws IOException

      Construct a system resource from a string. The resource is tried as classloader resource before being treated as a normal resource.
      Parameters:
        `resource` - Resource as string representation
      Returns:
        The new Resource
      Throws:
        `IOException` - Problem accessing resource.

    - #### newClassPathResource

          public static Resource newClassPathResource(String resource)

      Find a classpath resource.

    - #### newClassPathResource

          public static Resource newClassPathResource(String name,
                                      boolean useCaches,
                                      boolean checkParents)

      Find a classpath resource. The `Class.getResource(String)` method is used to lookup the resource. If it is not found, then the `Loader.getResource(Class, String, boolean)` method is used. If it is still not found, then `ClassLoader.getSystemResource(String)` is used. Unlike `ClassLoader.getSystemResource(String)` this method does not check for normal resources.
      Parameters:
        `name` - The relative name of the resource
        `useCaches` - True if URL caches are to be used.
        `checkParents` - True if forced searching of parent Classloaders is performed to work around loaders with inverted priorities
      Returns:
        Resource or null

    - #### isContainedIn

          public static boolean isContainedIn(Resource r,
                              Resource containingResource)
                                       throws MalformedURLException

      Throws:
        `MalformedURLException`

    - #### finalize

          protected void finalize()

      Overrides:
        `finalize` in class `Object`

    - #### isContainedIn

          public abstract boolean isContainedIn(Resource r)
                                         throws MalformedURLException

      Throws:
        `MalformedURLException`

    - #### release

          public abstract void release()

      Release any temporary resources held by the resource.

    - #### exists

          public abstract boolean exists()

      Returns true if the respresened resource exists.

    - #### isDirectory

          public abstract boolean isDirectory()

      Returns true if the respresenetd resource is a container/directory. If the resource is not a file, resources ending with "/" are considered directories.

    - #### lastModified

          public abstract long lastModified()

      Returns the last modified time

    - #### length

          public abstract long length()

      Return the length of the resource

    - #### getURL

          public abstract URL getURL()

      Returns an URL representing the given resource

    - #### getURI

          public URI getURI()

      Returns an URI representing the given resource

    - #### getFile

          public abstract File getFile()
                                throws IOException

      Returns an File representing the given resource or NULL if this is not possible.
      Throws:
        `IOException`

    - #### getName

          public abstract String getName()

      Returns the name of the resource

    - #### getInputStream

          public abstract InputStream getInputStream()
                                              throws IOException

      Returns an input stream to the resource
      Throws:
        `IOException`

    - #### getOutputStream

          public abstract OutputStream getOutputStream()
                                                throws IOException,
                                                       SecurityException

      Returns an output stream to the resource
      Throws:
        `IOException`
        `SecurityException`

    - #### delete

          public abstract boolean delete()
                                  throws SecurityException

      Deletes the given resource
      Throws:
        `SecurityException`

    - #### renameTo

          public abstract boolean renameTo(Resource dest)
                                    throws SecurityException

      Rename the given resource
      Throws:
        `SecurityException`

    - #### list

          public abstract String[] list()

      Returns a list of resource names contained in the given resource The resource names are not URL encoded.

    - #### addPath

          public abstract Resource addPath(String path)
                                    throws IOException,
                                           MalformedURLException

      Returns the resource contained inside the current resource with the given name.
      Parameters:
        `path` - The path segment to add, which should be encoded by the encode method.
      Throws:
        `IOException`
        `MalformedURLException`

    - #### getResource

          public Resource getResource(String path)

      Get a resource from withing this resource.

      This method is essentially an alias for `addPath(String)`, but without checked exceptions. This method satisfied the `ResourceFactory` interface.

      Specified by:
        `getResource` in interface `ResourceFactory`
      Parameters:
        `path` - The path to the resource
      Returns:
        The resource or null
      See Also:
        `ResourceFactory.getResource(java.lang.String)`

    - #### encode

          public String encode(String uri)

      Encode according to this resource type. The default implementation calls URI.encodePath(uri)
      Parameters:
        `uri` -
      Returns:
        String encoded for this resource type.

    - #### getAssociate

          public Object getAssociate()

    - #### setAssociate

          public void setAssociate(Object o)

    - #### getAlias

          public URL getAlias()

      Returns:
        The canonical Alias of this resource or null if none.

    - #### getListHTML

          public String getListHTML(String base,
                           boolean parent)
                             throws IOException

      Get the resource list as a HTML directory listing.
      Parameters:
        `base` - The base URL
        `parent` - True if the parent directory should be included
      Returns:
        String of HTML
      Throws:
        `IOException`

    - #### writeTo

          public void writeTo(OutputStream out,
                     long start,
                     long count)
                       throws IOException

      Parameters:
        `out` -
        `start` - First byte to write
        `count` - Bytes to write or -1 for all of them.
      Throws:
        `IOException`

    - #### copyTo

          public void copyTo(File destination)
                      throws IOException

      Throws:
        `IOException`

    - #### getWeakETag

          public String getWeakETag()

    - #### toURL

          public static URL toURL(File file)
                           throws MalformedURLException

      Generate a properly encoded URL from a `File` instance.
      Parameters:
        `file` - Target file.
      Returns:
        URL of the target file.
      Throws:
        `MalformedURLException`

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