Package org.dspace.discovery

Interface SearchService

All Known Implementing Classes:

SolrServiceImpl

public interface SearchService

Search interface that discovery uses

Author:

Kevin Van de Velde (kevin at atmire dot com), Mark Diggory (markd at atmire dot com), Ben Bosman (ben at atmire dot com)

Method Summary

Modifier and Type	Method	Description
String	calculateExtremeValue(Context context, String valueField, String sortField, DiscoverQuery.SORT_ORDER sortOrder)	This method returns us either the highest or lowest value for the field that we give to it depending on what sortOrder we give this method.
String	createLocationQueryForAdministrableItems(Context context)	Method to create a Query that includes all communities and collections a user may administrate.
String	escapeQueryChars(String query)	Utility method to escape any special characters in a user's query
FacetYearRange	getFacetYearRange(Context context, IndexableObject scope, DiscoverySearchFilterFacet facet, List<String> filterQueries, DiscoverQuery parentQuery)
List<Item>	getRelatedItems(Context context, Item item, DiscoveryMoreLikeThisConfiguration moreLikeThisConfiguration)
Iterator<Item>	iteratorSearch(Context context, IndexableObject dso, DiscoverQuery query)	Convenience method to call @see #search(Context, DSpaceObject, DiscoverQuery) and getting an iterator for the results
List<IndexableObject>	search(Context context, String query, String orderfield, boolean ascending, int offset, int max, String... filterquery)
DiscoverResult	search(Context context, DiscoverQuery query)	Convenient method to call #search(Context, DSpaceObject, DiscoverQuery) with a null DSpace Object as scope (i.e.
DiscoverResult	search(Context context, IndexableObject dso, DiscoverQuery query)	Convenient method to call @see #search(Context, DSpaceObject, DiscoverQuery, boolean) with includeWithdrawn=false
DiscoverFilterQuery	toFilterQuery(Context context, String field, String operator, String value, DiscoveryConfiguration config)	Transforms the given string field and value into a filter query
String	toSortFieldIndex(String metadataField, String type)	Transforms the metadata field of the given sort configuration into the indexed field which we can then use in our Solr queries.

Method Detail

search

DiscoverResult search(Context context,
                      DiscoverQuery query)
               throws SearchServiceException

Convenient method to call #search(Context, DSpaceObject, DiscoverQuery) with a null DSpace Object as scope (i.e. all the repository)

Parameters:

context - DSpace Context object.

query - the discovery query object.

Returns:

discovery search result object

Throws:

SearchServiceException - if search error

search

DiscoverResult search(Context context,
                      IndexableObject dso,
                      DiscoverQuery query)
               throws SearchServiceException

Convenient method to call @see #search(Context, DSpaceObject, DiscoverQuery, boolean) with includeWithdrawn=false

Parameters:

context - DSpace Context object

dso - a DSpace Object to use as scope of the search (only results within this object)

query - the discovery query object

Returns:

discovery search result object

Throws:

SearchServiceException - if search error

iteratorSearch

Iterator<Item> iteratorSearch(Context context,
                              IndexableObject dso,
                              DiscoverQuery query)
                       throws SearchServiceException

Convenience method to call @see #search(Context, DSpaceObject, DiscoverQuery) and getting an iterator for the results

Parameters:

context - DSpace context object

dso - a DSpace object to use as a scope of the search

query - the discovery query object

Returns:

an iterator iterating over all results from the search

Throws:

SearchServiceException - if search error

search

List<IndexableObject> search(Context context,
                             String query,
                             String orderfield,
                             boolean ascending,
                             int offset,
                             int max,
                             String... filterquery)

toFilterQuery

DiscoverFilterQuery toFilterQuery(Context context,
                                  String field,
                                  String operator,
                                  String value,
                                  DiscoveryConfiguration config)
                           throws SQLException

Transforms the given string field and value into a filter query

Parameters:

context - The relevant DSpace Context.

field - the field of the filter query

operator - equals/notequals/notcontains/authority/notauthority

value - the filter query value

config - (nullable) the discovery configuration (if not null, field's corresponding facet.type checked to be standard so suffix is not added for equals operator)

Returns:

a filter query

Throws:

SQLException - if database error An exception that provides information on a database access error or other errors.

getRelatedItems

List<Item> getRelatedItems(Context context,
                           Item item,
                           DiscoveryMoreLikeThisConfiguration moreLikeThisConfiguration)

createLocationQueryForAdministrableItems

String createLocationQueryForAdministrableItems(Context context)
                                         throws SQLException

Method to create a Query that includes all communities and collections a user may administrate. If a user has the appropriate rights to administrate communities and/or collections we want to look up all contents of those communities and/or collections, ignoring the read policies of the items (e.g. to list all private items of communities/collections the user administrates). This method returns a query to filter for items that belong to those communities/collections only.

Parameters:

context - The relevant DSpace Context.

Returns:

query string specific to the user's rights

Throws:

SQLException - An exception that provides information on a database access error or other errors.

toSortFieldIndex

String toSortFieldIndex(String metadataField,
                        String type)

Transforms the metadata field of the given sort configuration into the indexed field which we can then use in our Solr queries.

Parameters:

metadataField - the metadata field

type - see DiscoveryConfigurationParameters

Returns:

the indexed field

escapeQueryChars

String escapeQueryChars(String query)

Utility method to escape any special characters in a user's query

Parameters:

query - User's query to escape.

Returns:

query with any special characters escaped

getFacetYearRange

FacetYearRange getFacetYearRange(Context context,
                                 IndexableObject scope,
                                 DiscoverySearchFilterFacet facet,
                                 List<String> filterQueries,
                                 DiscoverQuery parentQuery)
                          throws SearchServiceException

Throws:

SearchServiceException

calculateExtremeValue

String calculateExtremeValue(Context context,
                             String valueField,
                             String sortField,
                             DiscoverQuery.SORT_ORDER sortOrder)
                      throws SearchServiceException

This method returns us either the highest or lowest value for the field that we give to it depending on what sortOrder we give this method.

Parameters:

context - The relevant DSpace context

valueField - The field in solr for which we'll calculate the extreme value

sortField - The field in solr for which we'll sort the calculated extreme value on This is typically the valueField appended with "_sort"

sortOrder - Entering ascending will return the minimum value Entering descending will return the maximum value

Returns:

Returns the min or max value based on the field in the parameters.

Throws:

SearchServiceException