org.frameworkset.util.io

Class AbstractResource

java.lang.Object

org.frameworkset.util.io.AbstractResource

All Implemented Interfaces:

InputStreamSource, Resource

Direct Known Subclasses:

ByteArrayResource, ClassPathResource, FileSystemResource, UrlResource

public abstract class AbstractResource
extends java.lang.Object
implements Resource

Title: AbstractResource.java

Description:

bboss workgroup

Copyright (c) 2007

Field Summary

Fields

Modifier and Type	Field and Description
protected long	savesize

Constructor Summary

Constructors

Constructor and Description
AbstractResource()

Method Summary

Modifier and Type	Method and Description
long	contentLength() This implementation checks the timestamp of the underlying File, if available.
Resource	createRelative(java.lang.String relativePath) This implementation throws a FileNotFoundException, assuming that relative resources cannot be created for this resource.
boolean	equals(java.lang.Object obj) This implementation compares description strings.
boolean	exists() This implementation checks whether a File can be opened, falling back to whether an InputStream can be opened.
java.io.File	getFile() This implementation throws a FileNotFoundException, assuming that the resource cannot be resolved to an absolute file path.
protected java.io.File	getFileForLastModifiedCheck() Determine the File to use for timestamp checking.
java.lang.String	getFilename() This implementation always throws IllegalStateException, assuming that the resource does not carry a filename.
long	getSavesize()
java.net.URI	getURI() This implementation builds a URI based on the URL returned by getURL().
java.net.URL	getURL() This implementation throws a FileNotFoundException, assuming that the resource cannot be resolved to a URL.
int	hashCode() This implementation returns the description's hash code.
boolean	isOpen() This implementation always returns false.
boolean	isReadable() This implementation always returns true.
long	lastModified() This implementation checks the timestamp of the underlying File, if available.
void	release()
void	savetofile(java.io.File destinctionFile)
void	savetofile(java.io.File destinctionFile, ResourceHandleListener<AbstractResource> listener)
java.lang.String	toString() This implementation returns the description of this resource.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.frameworkset.util.io.Resource

getDescription

Methods inherited from interface org.frameworkset.util.io.InputStreamSource

getInputStream

Field Detail

savesize

protected volatile long savesize

Constructor Detail

AbstractResource

public AbstractResource()

Method Detail

exists

public boolean exists()

This implementation checks whether a File can be opened, falling back to whether an InputStream can be opened. This will cover both directories and content resources.

Specified by:

exists in interface Resource

isReadable

public boolean isReadable()

This implementation always returns true.

Specified by:

isReadable in interface Resource

isOpen

public boolean isOpen()

This implementation always returns false.

Specified by:

isOpen in interface Resource

getURL

public java.net.URL getURL()
                    throws java.io.IOException

This implementation throws a FileNotFoundException, assuming that the resource cannot be resolved to a URL.

Specified by:

getURL in interface Resource

Throws:

java.io.IOException - if the resource cannot be resolved as URL, i.e. if the resource is not available as descriptor

getURI

public java.net.URI getURI()
                    throws java.io.IOException

This implementation builds a URI based on the URL returned by getURL().

Specified by:

getURI in interface Resource

Throws:

java.io.IOException - if the resource cannot be resolved as URI, i.e. if the resource is not available as descriptor

getFile

public java.io.File getFile()
                     throws java.io.IOException

This implementation throws a FileNotFoundException, assuming that the resource cannot be resolved to an absolute file path.

Specified by:

getFile in interface Resource

Throws:

java.io.IOException - if the resource cannot be resolved as absolute file path, i.e. if the resource is not available in a file system

lastModified

public long lastModified()
                  throws java.io.IOException

This implementation checks the timestamp of the underlying File, if available.

Specified by:

lastModified in interface Resource

Throws:

java.io.IOException - if the resource cannot be resolved (in the file system or as some other known physical resource type)

See Also:

getFileForLastModifiedCheck()

contentLength

public long contentLength()
                   throws java.io.IOException

This implementation checks the timestamp of the underlying File, if available.

Specified by:

contentLength in interface Resource

Throws:

java.io.IOException - if the resource cannot be resolved (in the file system or as some other known physical resource type)

See Also:

getFile()

getFileForLastModifiedCheck

protected java.io.File getFileForLastModifiedCheck()
                                            throws java.io.IOException

Determine the File to use for timestamp checking.

The default implementation delegates to getFile().

Returns:

the File to use for timestamp checking (never null)

Throws:

java.io.IOException - if the resource cannot be resolved as absolute file path, i.e. if the resource is not available in a file system

createRelative

public Resource createRelative(java.lang.String relativePath)
                        throws java.io.IOException

This implementation throws a FileNotFoundException, assuming that relative resources cannot be created for this resource.

Specified by:

createRelative in interface Resource

Parameters:

relativePath - the relative path (relative to this resource)

Returns:

the resource handle for the relative resource

Throws:

java.io.IOException - if the relative resource cannot be determined

getFilename

public java.lang.String getFilename()
                             throws java.lang.IllegalStateException

This implementation always throws IllegalStateException, assuming that the resource does not carry a filename.

Specified by:

getFilename in interface Resource

Throws:

java.lang.IllegalStateException

toString

public java.lang.String toString()

This implementation returns the description of this resource.

Overrides:

toString in class java.lang.Object

See Also:

Resource.getDescription()

equals

public boolean equals(java.lang.Object obj)

This implementation compares description strings.

Overrides:

equals in class java.lang.Object

See Also:

Resource.getDescription()

hashCode

public int hashCode()

This implementation returns the description's hash code.

Overrides:

hashCode in class java.lang.Object

See Also:

Resource.getDescription()

release

public void release()

Specified by:

release in interface Resource

savetofile

public void savetofile(java.io.File destinctionFile,
                       ResourceHandleListener<AbstractResource> listener)
                throws java.io.IOException

Throws:

java.io.IOException

savetofile

public void savetofile(java.io.File destinctionFile)
                throws java.io.IOException

Throws:

java.io.IOException

getSavesize

public long getSavesize()