Package com.vaadin.server

Class ClassResource

java.lang.Object

com.vaadin.server.ClassResource

All Implemented Interfaces:

ConnectorResource, Resource, Serializable

public class ClassResource
extends Object
implements ConnectorResource, Serializable

ClassResource is a named resource accessed with the class loader. This can be used to access resources such as icons, files, etc.

Since:

3.0

Author:

Vaadin Ltd.

See Also:

Class.getResource(java.lang.String), Serialized Form

Field Summary

Fields inherited from interface com.vaadin.server.ConnectorResource

CONNECTOR_PATH

Constructor Summary

Constructors

Constructor	Description
ClassResource(Class<?> associatedClass, String resourceName)	Creates a new application resource instance.
ClassResource(String resourceName)	Creates a new application resource instance.

Method Summary

Modifier and Type	Method	Description
protected Class<?>	getAssociatedClass()
int	getBufferSize()	Gets the size of the download buffer used for this resource.
long	getCacheTime()	Gets the length of cache expiration time.
String	getFilename()	Gets the virtual filename for this resource.
String	getMIMEType()	Gets the MIME type of this resource.
DownloadStream	getStream()	Gets resource as stream.
void	setBufferSize(int bufferSize)	Sets the size of the download buffer used for this resource.
void	setCacheTime(long cacheTime)	Sets the length of cache expiration time.

Methods inherited from class java.lang.Object

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

Constructor Detail

ClassResource

public ClassResource(String resourceName)

Creates a new application resource instance. The resource id is relative to the location of the UI of the component using this resource (or the Application if using LegacyWindow).

Parameters:

resourceName - the Unique identifier of the resource within the application.

ClassResource

public ClassResource(Class<?> associatedClass,
                     String resourceName)

Creates a new application resource instance.

Parameters:

associatedClass - the class of the which the resource is associated.

resourceName - the Unique identifier of the resource within the application.

Method Detail

getMIMEType

public String getMIMEType()

Gets the MIME type of this resource.

Specified by:

getMIMEType in interface Resource

Returns:

the MIME type of the resource.

See Also:

Resource.getMIMEType()

getFilename

public String getFilename()

Description copied from interface: ConnectorResource

Gets the virtual filename for this resource.

Specified by:

getFilename in interface ConnectorResource

Returns:

the file name associated to this resource.

getStream

public DownloadStream getStream()

Description copied from interface: ConnectorResource

Gets resource as stream.

Note that this method is called while the session is locked to prevent race conditions but the methods in the returned DownloadStream are assumed to be unrelated to the VaadinSession and are called without holding session locks (to prevent locking the session during long file downloads).

Specified by:

getStream in interface ConnectorResource

Returns:

A download stream which produces the resource content

getAssociatedClass

protected Class<?> getAssociatedClass()

getBufferSize

public int getBufferSize()

Gets the size of the download buffer used for this resource.

If the buffer size is 0, the buffer size is decided by the terminal adapter. The default value is 0.

Returns:

the size of the buffer in bytes.

setBufferSize

public void setBufferSize(int bufferSize)

Sets the size of the download buffer used for this resource.

Parameters:

bufferSize - the size of the buffer in bytes.

See Also:

getBufferSize()

getCacheTime

public long getCacheTime()

Gets the length of cache expiration time.

This gives the adapter the possibility cache streams sent to the client. The caching may be made in adapter or at the client if the client supports caching. Default is DownloadStream.DEFAULT_CACHETIME.

Returns:

Cache time in milliseconds

setCacheTime

public void setCacheTime(long cacheTime)

Sets the length of cache expiration time.

This gives the adapter the possibility cache streams sent to the client. The caching may be made in adapter or at the client if the client supports caching. Zero or negative value disables the caching of this stream.

Parameters:

cacheTime - the cache time in milliseconds.