org.dspace.content.service

Interface DSpaceObjectService<T extends DSpaceObject>

Type Parameters:

T - class type

All Known Subinterfaces:

BitstreamService, BundleService, CollectionService, CommunityService, EPersonService, GroupService, ItemService, SiteService

All Known Implementing Classes:

BitstreamServiceImpl, BundleServiceImpl, CollectionServiceImpl, CommunityServiceImpl, DSpaceObjectServiceImpl, EPersonServiceImpl, GroupServiceImpl, ItemServiceImpl, SiteServiceImpl

public interface DSpaceObjectService<T extends DSpaceObject>

Service interface class for the DSpaceObject. All DSpaceObject service classes should implement this class since it offers some basic methods which all DSpaceObjects are required to have.

Author:

kevinvandevelde at atmire.com

Method Summary

Methods

Modifier and Type	Method and Description
void	addMetadata(Context context, T dso, MetadataField metadataField, String language, List<String> values)
void	addMetadata(Context context, T dso, MetadataField metadataField, String lang, List<String> values, List<String> authorities, List<Integer> confidences) Add metadata fields.
void	addMetadata(Context context, T dso, MetadataField metadataField, String language, String value)
void	addMetadata(Context context, T dso, MetadataField metadataField, String language, String value, String authority, int confidence)
void	addMetadata(Context context, T dso, String schema, String element, String qualifier, String lang, List<String> values) Add metadata fields.
void	addMetadata(Context context, T dso, String schema, String element, String qualifier, String lang, List<String> values, List<String> authorities, List<Integer> confidences) Add metadata fields.
void	addMetadata(Context context, T dso, String schema, String element, String qualifier, String lang, String value) Add a single metadata field.
void	addMetadata(Context context, T dso, String schema, String element, String qualifier, String lang, String value, String authority, int confidence) Add a single metadata field.
void	clearMetadata(Context context, T dso, String schema, String element, String qualifier, String lang) Clear metadata values.
void	delete(Context context, T dso)
T	find(Context context, UUID id) Generic find for when the precise type of a DSO is not known, just the a pair of type number and database ID.
DSpaceObject	getAdminObject(Context context, T dso, int action) Return the dspace object where an ADMIN action right is sufficient to grant the initial authorize check.
ArrayList<String>	getIdentifiers(Context context, T dso) Tries to lookup all Identifiers of this DSpaceObject.
String	getMetadata(T dSpaceObject, String value) Get the value of a metadata field
List<MetadataValue>	getMetadata(T dSpaceObject, String mdString, String authority)
List<MetadataValue>	getMetadata(T dSpaceObject, String schema, String element, String qualifier, String lang) Get metadata for the DSpace Object in a chosen schema.
List<MetadataValue>	getMetadata(T dSpaceObject, String schema, String element, String qualifier, String lang, String authority)
List<MetadataValue>	getMetadataByMetadataString(T dSpaceObject, String mdString) Retrieve metadata field values from a given metadata string of the form <schema prefix>.<element>[.<qualifier>|.*]
String	getMetadataFirstValue(T dso, String schema, String element, String qualifier, String language)
String	getName(T dso) Get a proper name for the object.
DSpaceObject	getParentObject(Context context, T dso) Return the dspace object that "own" the current object in the hierarchy.
int	getSupportsTypeConstant() Returns the Constants which this service supports
String	getTypeText(T dso) Provide the text name of the type of this DSpaceObject.
void	removeMetadataValues(Context context, T dso, List<MetadataValue> values)
void	setMetadataSingleValue(Context context, T dso, String schema, String element, String qualifier, String language, String value) Set first metadata field value
void	update(Context context, T dso)
void	updateLastModified(Context context, T dso)

Method Detail

find

T find(Context context,
     UUID id)
                            throws SQLException

Generic find for when the precise type of a DSO is not known, just the a pair of type number and database ID.

Parameters:

context - - the context

id - - id within table of type'd objects

Returns:

the object found, or null if it does not exist.

Throws:

SQLException - only upon failure accessing the database.

getName

String getName(T dso)

Get a proper name for the object. This may return null. Name should be suitable for display in a user interface.

Parameters:

dso - DSpaceObject

Returns:

Name for the object, or null if it doesn't have one

getIdentifiers

ArrayList<String> getIdentifiers(Context context,
                               T dso)

Tries to lookup all Identifiers of this DSpaceObject.

Parameters:

context - DSpace context

dso - DSpaceObject

Returns:

An array containing all found identifiers or an array with a length of 0.

getParentObject

DSpaceObject getParentObject(Context context,
                           T dso)
                             throws SQLException

Return the dspace object that "own" the current object in the hierarchy. Note that this method has a meaning slightly different from the getAdminObject because it is independent of the action but it is in a way related to it. It defines the "first" dspace object OTHER then the current one, where allowed ADMIN actions imply allowed ADMIN actions on the object self.

Parameters:

context - DSpace context

dso - DSpaceObject

Returns:

the dspace object that "own" the current object in the hierarchy

Throws:

SQLException - if database error

getAdminObject

DSpaceObject getAdminObject(Context context,
                          T dso,
                          int action)
                            throws SQLException

Return the dspace object where an ADMIN action right is sufficient to grant the initial authorize check.

Default behaviour is ADMIN right on the object grant right on all other action on the object itself. Subclass should override this method as needed.

Parameters:

context - DSpace context

dso - DSpaceObject

action - ID of action being attempted, from org.dspace.core.Constants. The ADMIN action is not a valid parameter for this method, an IllegalArgumentException should be thrown

Returns:

the dspace object, if any, where an ADMIN action is sufficient to grant the original action

Throws:

SQLException - if database error

IllegalArgumentException - if the ADMIN action is supplied as parameter of the method call

getTypeText

String getTypeText(T dso)

Provide the text name of the type of this DSpaceObject. It is most likely all uppercase.

Parameters:

dso - DSpaceObject

Returns:

Object type as text

getMetadata

List<MetadataValue> getMetadata(T dSpaceObject,
                              String schema,
                              String element,
                              String qualifier,
                              String lang)

Get metadata for the DSpace Object in a chosen schema. See MetadataSchema for more information about schemas. Passing in a null value for qualifier or lang only matches metadata fields where that qualifier or languages is actually null. Passing in DSpaceObject.ANY retrieves all metadata fields with any value for the qualifier or language, including null

Examples:

Return values of the unqualified "title" field, in any language. Qualified title fields (e.g. "title.uniform") are NOT returned:

dspaceobject.getMetadataByMetadataString("dc", "title", null, DSpaceObject.ANY );

Return all US English values of the "title" element, with any qualifier (including unqualified):

dspaceobject.getMetadataByMetadataString("dc, "title", DSpaceObject.ANY, "en_US" );

The ordering of values of a particular element/qualifier/language combination is significant. When retrieving with wildcards, values of a particular element/qualifier/language combinations will be adjacent, but the overall ordering of the combinations is indeterminate.

Parameters:

dSpaceObject - DSpaceObject

schema - the schema for the metadata field. Must match the name of an existing metadata schema.

element - the element name. DSpaceObject.ANY matches any element. null doesn't really make sense as all metadata must have an element.

qualifier - the qualifier. null means unqualified, and DSpaceObject.ANY means any qualifier (including unqualified.)

lang - the ISO639 language code, optionally followed by an underscore and the ISO3166 country code. null means only values with no language are returned, and DSpaceObject.ANY means values with any country code or no country code are returned.

Returns:

metadata fields that match the parameters

getMetadataByMetadataString

List<MetadataValue> getMetadataByMetadataString(T dSpaceObject,
                                              String mdString)

Retrieve metadata field values from a given metadata string of the form <schema prefix>.<element>[.<qualifier>|.*]

Parameters:

dSpaceObject - DSpaceObject

mdString - The metadata string of the form <schema prefix>.<element>[.<qualifier>|.*]

Returns:

metadata fields that match the parameters

getMetadata

String getMetadata(T dSpaceObject,
                 String value)

Get the value of a metadata field

Parameters:

dSpaceObject - DSpaceObject

value - the name of the metadata field to get

Returns:

the value of the metadata field (or null if the column is an SQL NULL)

Throws:

IllegalArgumentException - if the requested metadata field doesn't exist

getMetadata

List<MetadataValue> getMetadata(T dSpaceObject,
                              String mdString,
                              String authority)

getMetadata

List<MetadataValue> getMetadata(T dSpaceObject,
                              String schema,
                              String element,
                              String qualifier,
                              String lang,
                              String authority)

addMetadata

void addMetadata(Context context,
               T dso,
               String schema,
               String element,
               String qualifier,
               String lang,
               List<String> values)
                 throws SQLException

Add metadata fields. These are appended to existing values. Use clearDC to remove values. The ordering of values passed in is maintained.

If metadata authority control is available, try to get authority values. The authority confidence depends on whether authority is required or not.

Parameters:

context - DSpace context

dso - DSpaceObject

schema - the schema for the metadata field. Must match the name of an existing metadata schema.

element - the metadata element name

qualifier - the metadata qualifier name, or null for unqualified

lang - the ISO639 language code, optionally followed by an underscore and the ISO3166 country code. null means the value has no language (for example, a date).

values - the values to add.

Throws:

SQLException - if database error

addMetadata

void addMetadata(Context context,
               T dso,
               String schema,
               String element,
               String qualifier,
               String lang,
               List<String> values,
               List<String> authorities,
               List<Integer> confidences)
                 throws SQLException

Add metadata fields. These are appended to existing values. Use clearDC to remove values. The ordering of values passed in is maintained.

Parameters:

context - DSpace context

dso - DSpaceObject

schema - the schema for the metadata field. Must match the name of an existing metadata schema.

element - the metadata element name

qualifier - the metadata qualifier name, or null for unqualified

lang - the ISO639 language code, optionally followed by an underscore and the ISO3166 country code. null means the value has no language (for example, a date).

values - the values to add.

authorities - the external authority key for this value (or null)

confidences - the authority confidence (default 0)

Throws:

SQLException - if database error

addMetadata

void addMetadata(Context context,
               T dso,
               MetadataField metadataField,
               String lang,
               List<String> values,
               List<String> authorities,
               List<Integer> confidences)
                 throws SQLException

Add metadata fields. These are appended to existing values. Use clearDC to remove values. The ordering of values passed in is maintained.

Parameters:

context - DSpace context

dso - DSpaceObject

metadataField - the metadata field to which the value is to be set

lang - the ISO639 language code, optionally followed by an underscore and the ISO3166 country code. null means the value has no language (for example, a date).

values - the values to add.

authorities - the external authority key for this value (or null)

confidences - the authority confidence (default 0)

Throws:

SQLException - if database error

addMetadata

void addMetadata(Context context,
               T dso,
               MetadataField metadataField,
               String language,
               String value,
               String authority,
               int confidence)
                 throws SQLException

Throws:

SQLException

addMetadata

void addMetadata(Context context,
               T dso,
               MetadataField metadataField,
               String language,
               String value)
                 throws SQLException

Throws:

SQLException

addMetadata

void addMetadata(Context context,
               T dso,
               MetadataField metadataField,
               String language,
               List<String> values)
                 throws SQLException

Throws:

SQLException

addMetadata

void addMetadata(Context context,
               T dso,
               String schema,
               String element,
               String qualifier,
               String lang,
               String value)
                 throws SQLException

Add a single metadata field. This is appended to existing values. Use clearDC to remove values.

Parameters:

context - DSpace context

dso - DSpaceObject

schema - the schema for the metadata field. Must match the name of an existing metadata schema.

element - the metadata element name

qualifier - the metadata qualifier, or null for unqualified

lang - the ISO639 language code, optionally followed by an underscore and the ISO3166 country code. null means the value has no language (for example, a date).

value - the value to add.

Throws:

SQLException - if database error

addMetadata

void addMetadata(Context context,
               T dso,
               String schema,
               String element,
               String qualifier,
               String lang,
               String value,
               String authority,
               int confidence)
                 throws SQLException

Add a single metadata field. This is appended to existing values. Use clearDC to remove values.

Parameters:

context - DSpace context

dso - DSpaceObject

schema - the schema for the metadata field. Must match the name of an existing metadata schema.

element - the metadata element name

qualifier - the metadata qualifier, or null for unqualified

lang - the ISO639 language code, optionally followed by an underscore and the ISO3166 country code. null means the value has no language (for example, a date).

value - the value to add.

authority - the external authority key for this value (or null)

confidence - the authority confidence (default 0)

Throws:

SQLException - if database error

clearMetadata

void clearMetadata(Context context,
                 T dso,
                 String schema,
                 String element,
                 String qualifier,
                 String lang)
                   throws SQLException

Clear metadata values. As with getDC above, passing in null only matches fields where the qualifier or language is actually null.Item.ANY will match any element, qualifier or language, including null. Thus, dspaceobject.clearDC(Item.ANY, Item.ANY, Item.ANY) will remove all Dublin Core metadata associated with an DSpaceObject.

Parameters:

context - DSpace context

dso - DSpaceObject

schema - the schema for the metadata field. Must match the name of an existing metadata schema.

element - the Dublin Core element to remove, or Item.ANY

qualifier - the qualifier. null means unqualified, and Item.ANY means any qualifier (including unqualified.)

lang - the ISO639 language code, optionally followed by an underscore and the ISO3166 country code. null means only values with no language are removed, and Item.ANY means values with any country code or no country code are removed.

Throws:

SQLException - if database error

removeMetadataValues

void removeMetadataValues(Context context,
                        T dso,
                        List<MetadataValue> values)
                          throws SQLException

Throws:

SQLException

getMetadataFirstValue

String getMetadataFirstValue(T dso,
                           String schema,
                           String element,
                           String qualifier,
                           String language)

setMetadataSingleValue

void setMetadataSingleValue(Context context,
                          T dso,
                          String schema,
                          String element,
                          String qualifier,
                          String language,
                          String value)
                            throws SQLException

Set first metadata field value

Parameters:

context - DSpace context

dso - DSpaceObject

schema - the schema for the metadata field. Must match the name of an existing metadata schema.

element - the Dublin Core element to remove, or Item.ANY

qualifier - the qualifier. null means unqualified, and Item.ANY means any qualifier (including unqualified.)

language - the ISO639 language code, optionally followed by an underscore and the ISO3166 country code. null means only values with no language are removed, and Item.ANY means values with any country code or no country code are removed.

value - metadata value

Throws:

SQLException - if database error

updateLastModified

void updateLastModified(Context context,
                      T dso)
                        throws SQLException,
                               AuthorizeException

Throws:

SQLException

AuthorizeException

update

void update(Context context,
          T dso)
            throws SQLException,
                   AuthorizeException

Throws:

SQLException

AuthorizeException

delete

void delete(Context context,
          T dso)
            throws SQLException,
                   AuthorizeException,
                   IOException

Throws:

SQLException

AuthorizeException

IOException

getSupportsTypeConstant

int getSupportsTypeConstant()

Returns the Constants which this service supports

Returns:

a org.dspace.core.Constants that represents a DSpaceObjct type