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AbstractResource (Spring Framework API 2.0) - Spring Framework 2.0.5 API 文档英文版

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org.springframework.core.io
Class AbstractResource

java.lang.Object
  org.springframework.core.io.AbstractResource

All Implemented Interfaces:

InputStreamSource, Resource

Direct Known Subclasses:

ByteArrayResource, ClassPathResource, DescriptiveResource, FileSystemResource, InputStreamResource, PortletContextResource, ServletContextResource, UrlResource

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public abstract class AbstractResource
extends Object
implements Resource

Convenience base class for Resource implementations, pre-implementing typical behavior.

The "exists" method will check whether a File or InputStream can be opened; "isOpen" will always return false; "getURL" and "getFile" throw an exception; and "toString" will return the description.

Since:

28.12.2003

Author:

Juergen Hoeller

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Constructor Summary
AbstractResource()

 

Method Summary
Resource	createRelative(String relativePath)           This implementation throws a FileNotFoundException, assuming that relative resources cannot be created for this resource.
boolean	equals(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.
abstract  String	getDescription()           This abstract method declaration shadows the method in the Resource interface.
File	getFile()           This implementation throws a FileNotFoundException, assuming that the resource cannot be resolved to an absolute file path.
String	getFilename()           This implementation always throws IllegalStateException, assuming that the resource does not carry a filename.
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.
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.springframework.core.io.InputStreamSource
getInputStream

 

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

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isOpen

public boolean isOpen()

This implementation always returns false.

Specified by:

isOpen in interface Resource

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getURL

public URL getURL()
           throws IOException

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

Specified by:

getURL in interface Resource

Throws:

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

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getFile

public File getFile()
             throws 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:

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

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createRelative

public Resource createRelative(String relativePath)
                        throws 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:

IOException - if the relative resource cannot be determined

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getFilename

public String getFilename()
                   throws IllegalStateException

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

Specified by:

getFilename in interface Resource

Throws:

IllegalStateException

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getDescription

public abstract String getDescription()

This abstract method declaration shadows the method in the Resource interface. This is necessary to make the toString implementation in this class work on Sun's JDK 1.3 classic VM, which can't find the method when executing toString else. Furthermore, getDescription is also called from equals and hashCode

Specified by:

getDescription in interface Resource

See Also:

Resource.getDescription(), toString(), equals(Object), hashCode()

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toString

public String toString()

This implementation returns the description of this resource.

Overrides:

toString in class Object

See Also:

getDescription()

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equals

public boolean equals(Object obj)

This implementation compares description strings.

Overrides:

equals in class Object

See Also:

getDescription()

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hashCode

public int hashCode()

This implementation returns the description's hash code.

Overrides:

hashCode in class Object

See Also:

getDescription()

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