org.apache.jackrabbit.server.io

Interface IOHandler

All Known Implementing Classes:

DefaultHandler, DirListingExportHandler, VersionHandler, VersionHistoryHandler, XmlHandler, ZipHandler

public interface IOHandler

IOHandler interface defines methods for importing and exporting resource content as well as some fundamental resource properties which use to be set/retrieved together with content import and export (e.g. content length, modification date etc.).

Method Summary

Modifier and Type	Method and Description
boolean	canExport(ExportContext context, boolean isCollection) Returns true, if this handler can run a successful export based on the specified context.
boolean	canExport(ExportContext context, DavResource resource) Returns true, if this handler can run a successful export based on the specified context and resource.
boolean	canImport(ImportContext context, boolean isCollection) Returns true, if this handler can run a successful import based on the specified context.
boolean	canImport(ImportContext context, DavResource resource) Returns true, if this handler can run a successful import based on the specified context and resource.
boolean	exportContent(ExportContext context, boolean isCollection) Runs the export for the given context.
boolean	exportContent(ExportContext context, DavResource resource) Runs the export for the given context and resource.
IOManager	getIOManager() Returns the IOManager that called this handler or null.
String	getName() Returns a human readable name for this IOHandler.
boolean	importContent(ImportContext context, boolean isCollection) Runs the import for the given context and indicates by a boolean return value, if the import could be completed successfully.
boolean	importContent(ImportContext context, DavResource resource) Runs the import for the given context and resource.
void	setIOManager(IOManager ioManager) Sets the IOManager that called this handler.

Method Detail

getIOManager

IOManager getIOManager()

Returns the IOManager that called this handler or null.

setIOManager

void setIOManager(IOManager ioManager)

Sets the IOManager that called this handler.

getName

String getName()

Returns a human readable name for this IOHandler.

canImport

boolean canImport(ImportContext context,
                  boolean isCollection)

Returns true, if this handler can run a successful import based on the specified context.

canImport

boolean canImport(ImportContext context,
                  DavResource resource)

Returns true, if this handler can run a successful import based on the specified context and resource. A simple implementation may choose to return the same as canImport(ImportContext, boolean) where the isCollection flag is determined by DavResource.isCollection().

importContent

boolean importContent(ImportContext context,
                      boolean isCollection)
               throws IOException

Runs the import for the given context and indicates by a boolean return value, if the import could be completed successfully. If the specified ImportContext does not provide a stream the implementation is free, to only import properties of to refuse the import.

Please note, that it is the responsibility of the specified ImportContext to assert, that its stream is not consumed multiple times when being passed to a chain of IOHandlers.

Parameters:

context -

isCollection -

Returns:

true if the import was successful.

Throws:

IOException - if an unexpected error occurs or if this method has been called although canImport(ImportContext, boolean) returns false.

importContent

boolean importContent(ImportContext context,
                      DavResource resource)
               throws IOException

Runs the import for the given context and resource. It indicates by a boolean return value, if the import could be completed successfully. If the specified ImportContext does not provide a stream the implementation is free, to only import properties of to refuse the import. A simple implementation may return the same as importContent(ImportContext, boolean) where the isCollection flag is determined by DavResource.isCollection()

Please note, that it is the responsibility of the specified ImportContext to assert, that its stream is not consumed multiple times when being passed to a chain of IOHandlers.

Parameters:

context -

resource -

Returns:

Throws:

IOException - if an unexpected error occurs or if this method has been called although canImport(ImportContext, DavResource) returns false.

See Also:

importContent(ImportContext, boolean)

canExport

boolean canExport(ExportContext context,
                  boolean isCollection)

Returns true, if this handler can run a successful export based on the specified context.

canExport

boolean canExport(ExportContext context,
                  DavResource resource)

Returns true, if this handler can run a successful export based on the specified context and resource. A simple implementation may choose to return the same as canExport(ExportContext, boolean) where the isCollection flag is determined by DavResource.isCollection().

exportContent

boolean exportContent(ExportContext context,
                      boolean isCollection)
               throws IOException

Runs the export for the given context. It indicates by a boolean return value, if the export could be completed successfully. If the specified ExportContext does not provide a stream the implementation should set the properties only and ignore the content to be exported. A simple implementation may return the same as exportContent(ExportContext, boolean) where the isCollection flag is determined by DavResource.isCollection()

Please note, that it is the responsibility of the specified ExportContext to assert, that its stream is not written multiple times when being passed to a chain of IOHandlers.

Parameters:

context -

isCollection -

Returns:

Throws:

IOException - if an unexpected error occurs or if this method has been called although canExport(ExportContext, boolean) returns false.

exportContent

boolean exportContent(ExportContext context,
                      DavResource resource)
               throws IOException

Runs the export for the given context and resource. It indicates by a boolean return value, if the export could be completed successfully. If the specified ExportContext does not provide a stream the implementation should set the properties only and ignore the content to be exported. A simple implementation may return the same as exportContent(ExportContext, boolean) where the isCollection flag is determined by DavResource.isCollection()

Please note, that it is the responsibility of the specified ExportContext to assert, that its stream is not written multiple times when being passed to a chain of IOHandlers.

Parameters:

context -

resource -

Returns:

Throws:

IOException - if an unexpected error occurs or if this method has been called although canExport(ExportContext, DavResource) returns false.