com.saperion.ngc.viewer.temporary

Class TemporaryDocumentPreviewService

java.lang.Object

com.saperion.ngc.viewer.temporary.TemporaryDocumentPreviewService

All Implemented Interfaces:

Serializable

public final class TemporaryDocumentPreviewService
extends Object
implements Serializable

This service class is used to cache the binary content of uploaded documents in order to be displayed by a indexing masks viewer.

Author:

sts

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
static TemporaryDocumentId	cacheDocument(byte[] document) Caches the document represented by the given byte array.
static TemporaryDocumentId	cacheDocument(org.zkoss.util.media.Media media) Caches the document represented by the given media.
static void	disable() Disables the temporary document preview service.
static boolean	enable(long maxViewSizeInBytes) Enables the temporary document preview service.
static InputStream	getDocument(TemporaryDocumentId id) Returns a previously cached document as an InputStream.
static byte[]	getDocumentAsByteArray(TemporaryDocumentId id) Returns a previously cached document as a byte array.
static boolean	isEnabled() Indicates if this services is enabled and if temporary documents can be cached.

Methods inherited from class java.lang.Object

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

Method Detail

enable

public static boolean enable(long maxViewSizeInBytes)

Enables the temporary document preview service.

Parameters:

maxViewSizeInBytes - maximum size of viewable documents

Returns:

true, if enabling was successful, false otherwise.

disable

public static void disable()

Disables the temporary document preview service.

isEnabled

public static boolean isEnabled()

Indicates if this services is enabled and if temporary documents can be cached.

Returns:

true, if this services is enabled, false otherwise.

cacheDocument

public static TemporaryDocumentId cacheDocument(byte[] document)
                                         throws ViewSizeException,
                                                NotEnabledException,
                                                InternalCacheException

Caches the document represented by the given byte array.

Parameters:

document - The document to cache.

Returns:

a TemporaryDocumentId identifying the cached document.

Throws:

ViewSizeException - when the document is too large to cache

InternalCacheException - if the caching of the temporary content failed

NotEnabledException - if this service is not enabled or a failure occurred.

cacheDocument

public static TemporaryDocumentId cacheDocument(org.zkoss.util.media.Media media)
                                         throws ViewSizeException,
                                                NotEnabledException,
                                                InternalCacheException,
                                                IOException

Caches the document represented by the given media.

Parameters:

media - The document to cache.

Returns:

a TemporaryDocumentId identifying the cached document.

Throws:

ViewSizeException - when the document is too large to cache

InternalCacheException - if the caching of the temporary content failed

NotEnabledException - if this service is not enabled or a failure occurred.

IOException - if reading from the media failed

getDocumentAsByteArray

public static byte[] getDocumentAsByteArray(TemporaryDocumentId id)
                                     throws Exception

Returns a previously cached document as a byte array.

Parameters:

id - The id of a previously cached document.

Returns:

the cached document as a byte array.

Throws:

Exception - if this service is not enabled, the requested document is not available in cache or a failure occurred.

getDocument

public static InputStream getDocument(TemporaryDocumentId id)
                               throws NotEnabledException,
                                      com.saperion.cache.exception.ElementNotFoundException,
                                      InternalCacheException

Returns a previously cached document as an InputStream.

Parameters:

id - The id of a previously cached document.

Returns:

the cached document as an InputStream.

Throws:

NotEnabledException - if this service is not enabled,

com.saperion.cache.exception.ElementNotFoundException - if the requested document is not available in cache

InternalCacheException - if an error occurred while reading from the cache