com.esri.gpt.server.assertion.index
Class AsnIndexAdapter

java.lang.Object
  com.esri.gpt.server.assertion.index.AsnBaseIndexAdapter
      com.esri.gpt.server.assertion.index.AsnIndexAdapter

public class AsnIndexAdapter
extends AsnBaseIndexAdapter

Handles read/write operations against a Lucene index of assertions.

Constructor Summary

AsnIndexAdapter()
Default constructor

Method Summary

long	count(AsnContext context, IndexSearcher searcher, String valueField, String subject, String predicate, String value) Returns a hit count for a subject, predicate and value combination.
void	delete(AsnContext context, String assertionId) Deletes an assertion.
void	index(AsnContext context, Assertion assertion) Indexes an assertion.
Assertion	loadAssertionById(AsnContext context, boolean mustExist) Loads an assertion based upon the subject id of the active operation.
Assertion	loadPreviousUserAssertion(AsnContext context) Loads the assertion previously cast for the active subject, predicate and user.
Assertion	loadPreviousUserAssertion(AsnContext context, IndexSearcher searcher) Loads the assertion previously cast for the active subject, predicate and user.

Methods inherited from class com.esri.gpt.server.assertion.index.AsnBaseIndexAdapter

closeReader, closeSearcher, closeWriter, configure, getDirectory, getIndexReference, getNativeLockFactory, makeIndexReader, makeIndexWriter, newAnalyzer, optimize, setIndexReference, touch

Methods inherited from class java.lang.Object

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

Constructor Detail

AsnIndexAdapter

public AsnIndexAdapter()

Default constructor

Method Detail

count

public long count(AsnContext context,
                  IndexSearcher searcher,
                  String valueField,
                  String subject,
                  String predicate,
                  String value)
           throws CorruptIndexException,
                  IOException

Returns a hit count for a subject, predicate and value combination.
This will only work correctly for values that have not been analyzed prior to indexing.

Parameters:

context - the assertion operation context

searcher - the index searcher

valueField - the value field name

subject - the subject

predicate - the predicate

value - the value

Returns:

the cardinality

Throws:

CorruptIndexException - if the index is corrupt

IOException - if an I/O exception occurs

delete

public void delete(AsnContext context,
                   String assertionId)
            throws CorruptIndexException,
                   LockObtainFailedException,
                   IOException

Deletes an assertion.

Parameters:

context - the assertion operation context

assertionId - the assertion ID to delete

Throws:

CorruptIndexException - if the index is corrupt

LockObtainFailedException - if a write lock cannot be obtained

IOException - if an I/O exception occurs

index

public void index(AsnContext context,
                  Assertion assertion)
           throws CorruptIndexException,
                  LockObtainFailedException,
                  IOException

Indexes an assertion.

Parameters:

context - the assertion operation context

assertion - the assertion to index

Throws:

CorruptIndexException - if the index is corrupt

LockObtainFailedException - if a write lock cannot be obtained

IOException - if an I/O exception occurs

loadAssertionById

public Assertion loadAssertionById(AsnContext context,
                                   boolean mustExist)
                            throws CorruptIndexException,
                                   IOException,
                                   AsnInvalidOperationException

Loads an assertion based upon the subject id of the active operation.

Parameters:

context - the assertion operation context

mustExist - true true if the assertion must exist

Returns:

the assertion (null if not found)

Throws:

CorruptIndexException - if the index is corrupt

IOException - if an I/O exception occurs

AsnInvalidOperationException - if mustExist and the assertion was not found

loadPreviousUserAssertion

public Assertion loadPreviousUserAssertion(AsnContext context)
                                    throws Exception

Loads the assertion previously cast for the active subject, predicate and user.

Parameters:

context - the assertion operation context

Returns:

the previously cast assertion (can be null)

Throws:

Exception - if an exception occurs

loadPreviousUserAssertion

public Assertion loadPreviousUserAssertion(AsnContext context,
                                           IndexSearcher searcher)
                                    throws Exception

Loads the assertion previously cast for the active subject, predicate and user.

Parameters:

context - the assertion operation context

searcher - the index searcher

Returns:

the previously cast assertion (can be null)

Throws:

Exception - if an exception occurs