org.dlese.dpc.schemedit.ndr.writer
Class NSDLCollectionWriter

java.lang.Object
  org.dlese.dpc.schemedit.ndr.writer.MetadataWriter
      org.dlese.dpc.schemedit.ndr.writer.NSDLCollectionWriter

public class NSDLCollectionWriter
extends MetadataWriter

Creates or updates the NDR Objects necessary to create a NSDL collection in the NDR, namely the collection Metadata Record, Collection Resource, Collection Aggregator, and Collection MetadataProvider.

NOTE: A NSDL collection is different from the representation of a DLESE/NCS collection in the NDR. A NCS collection consists of only a MetadataProvider, Aggregator and item-level Metadata objects. If we are creating an NSDL collection for an EXISTING NCS collection we need to do some additional operations, which are NOT YET IMPLEMENTED:

• connect the existing MetadataProvider object to the newly created Collection Aggregator
• add a "memberOf" relation to each resource object that points to the Collection Aggregator.

Author:

Jonathan Ostwald

Field Summary

Fields inherited from class org.dlese.dpc.schemedit.ndr.writer.MetadataWriter

collectionConfig, dcsDataRecord, docReader, finalAndValid, itemRecord, mdReader, nsdlItemId, recId, rm, servletContext, xmlConversionService

Constructor Summary

NSDLCollectionWriter(ServletContext servletContext)
Constructor for the NSDLCollectionWriter object

Method Summary

protected NdrRequest	addMetadataRequest(NdrRequest ndrRequest, String resHandle) Adds a feature to the MetadataRequest attribute of the NSDLCollectionWriter object
protected List	getMetadataForRelationsToAdd(String resourceHandle) Gets the metadataForRelationsToAdd attribute of the NSDLCollectionWriter object.
protected MetadataReader	getMetadataReader() Gets the metadataReader attribute of the NSDLCollectionWriter object
protected Element	getNCSCollectionConfig() Returns the collection_config data_stream from the collection MDP if possible.
protected String	getNCSCollectionNativeFormat() For Collections whose items are managed by this NCS instance, we can find the itemFormat by inspecting the "collection_config" stream of the Collection MetadataProvider object.
protected NdrRequest	modifyMetadataRequest(NdrRequest ndrRequest, String resHandle, Element nsdl_dc_stream) Description of the Method
SyncReportEntry	write(String recId, DcsDataRecord dcsDataRecord) Convenience write method that doesn't require ncs_collect metadata to be supplied (this will be obtained from index in the callee).
SyncReportEntry	write(String recId, String recordXml, DcsDataRecord dcsDataRecord) Creates or updates collection-level NDR Objects necessary to define a NSDL collection in the NDR, including collection-level metadata object, collection resource, and collection aggregator.

Methods inherited from class org.dlese.dpc.schemedit.ndr.writer.MetadataWriter

getCollectionConfig, getItemRecord, getMetaDataFramework, getResourceHandle, getResourceUrl, getServletContextAttribute, getValueOrNull, getWriteRequest, init, setServletContext

Methods inherited from class java.lang.Object

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

Constructor Detail

NSDLCollectionWriter

public NSDLCollectionWriter(ServletContext servletContext)
                     throws Exception

Constructor for the NSDLCollectionWriter object

Parameters:

servletContext - NOT YET DOCUMENTED

Throws:

Exception - NOT YET DOCUMENTED

Method Detail

write

public SyncReportEntry write(String recId,
                             DcsDataRecord dcsDataRecord)
                      throws Exception

Convenience write method that doesn't require ncs_collect metadata to be supplied (this will be obtained from index in the callee).

Overrides:

write in class MetadataWriter

Parameters:

recId - NOT YET DOCUMENTED

dcsDataRecord - NOT YET DOCUMENTED

Returns:

NOT YET DOCUMENTED

Throws:

Exception - NOT YET DOCUMENTED

write

public SyncReportEntry write(String recId,
                             String recordXml,
                             DcsDataRecord dcsDataRecord)
                      throws Exception

Creates or updates collection-level NDR Objects necessary to define a NSDL collection in the NDR, including collection-level metadata object, collection resource, and collection aggregator.

NOTE: if the NCSL collection already exists, then there is a possibility that the collection's resource URL has been modified. For this reason, we have to locate the collection definition objects in the NDR by other means than the resource URL ...

Overrides:

write in class MetadataWriter

Parameters:

recId - record id, used to obtain collection metadata from index if necessary

recordXml - collection metadata as String (optionally provided)

dcsDataRecord - auxillary information about the collection metadata record

Returns:

NOT YET DOCUMENTED

Throws:

Exception - NOT YET DOCUMENTED

getMetadataForRelationsToAdd

protected List getMetadataForRelationsToAdd(String resourceHandle)

Gets the metadataForRelationsToAdd attribute of the NSDLCollectionWriter object. To the "metadataFor" relation created by MetadataWriter we add a "meatadataFor" relation to the collection resource.

Parameters:

resourceHandle - Description of the Parameter

Returns:

The metadataForRelationsToAdd value

addMetadataRequest

protected NdrRequest addMetadataRequest(NdrRequest ndrRequest,
                                        String resHandle)
                                 throws Exception

Adds a feature to the MetadataRequest attribute of the NSDLCollectionWriter object

Overrides:

addMetadataRequest in class MetadataWriter

Parameters:

ndrRequest - The feature to be added to the MetadataRequest attribute

resHandle - The feature to be added to the MetadataRequest attribute

Returns:

Description of the Return Value

Throws:

Exception - Description of the Exception

modifyMetadataRequest

protected NdrRequest modifyMetadataRequest(NdrRequest ndrRequest,
                                           String resHandle,
                                           Element nsdl_dc_stream)
                                    throws Exception

Description of the Method

Overrides:

modifyMetadataRequest in class MetadataWriter

Parameters:

ndrRequest - Description of the Parameter

resHandle - Description of the Parameter

nsdl_dc_stream - Description of the Parameter

Returns:

Description of the Return Value

Throws:

Exception - Description of the Exception

getMetadataReader

protected MetadataReader getMetadataReader()
                                    throws Exception

Gets the metadataReader attribute of the NSDLCollectionWriter object

Overrides:

getMetadataReader in class MetadataWriter

Returns:

The metadataReader value

Throws:

Exception - NOT YET DOCUMENTED

getNCSCollectionConfig

protected Element getNCSCollectionConfig()

Returns the collection_config data_stream from the collection MDP if possible. Used to test whether the NSDL Collection governs a collection whose items are managed in the NCS.

Returns:

The the collection_config data stream from the collection mdpReader

getNCSCollectionNativeFormat

protected String getNCSCollectionNativeFormat()

For Collections whose items are managed by this NCS instance, we can find the itemFormat by inspecting the "collection_config" stream of the Collection MetadataProvider object.

Returns:

The nCSCollectionNativeFormat value