com.orientechnologies.lucene.functions

Class OLuceneSearchFunctionTemplate

java.lang.Object

com.orientechnologies.orient.core.sql.functions.OSQLFunctionAbstract

com.orientechnologies.lucene.functions.OLuceneSearchFunctionTemplate

All Implemented Interfaces:

OIndexableSQLFunction, OSQLFunction

Direct Known Subclasses:

OLuceneSearchOnClassFunction, OLuceneSearchOnFieldsFunction, OLuceneSearchOnIndexFunction

public abstract class OLuceneSearchFunctionTemplate
extends OSQLFunctionAbstract
implements OIndexableSQLFunction

Created by frank on 25/05/2017.

Field Summary

Fields inherited from class com.orientechnologies.orient.core.sql.functions.OSQLFunctionAbstract

maxParams, minParams, name

Constructor Summary

Constructors

Constructor and Description
OLuceneSearchFunctionTemplate(String iName, int iMinParams, int iMaxParams)

Method Summary

Modifier and Type	Method and Description
boolean	allowsIndexedExecution(OFromClause target, OBinaryCompareOperator operator, Object rightValue, OCommandContext ctx, OExpression... args) Checks if this function can be used to fetch data from this target and with these arguments (eg.
boolean	canExecuteInline(OFromClause target, OBinaryCompareOperator operator, Object rightValue, OCommandContext ctx, OExpression... args) checks if the function can be used even on single records, not as an indexed function (even if the index does not exist at all)
long	estimate(OFromClause target, OBinaryCompareOperator operator, Object rightValue, OCommandContext ctx, OExpression... args) estimates the number of entries returned by searchFromTarget() with these parameters
protected abstract OLuceneFullTextIndex	searchForIndex(OFromClause target, OCommandContext ctx, OExpression... args)
boolean	shouldExecuteAfterSearch(OFromClause target, OBinaryCompareOperator operator, Object rightValue, OCommandContext ctx, OExpression... args) Checks if this function should be called even if the method OIndexableSQLFunction.searchFromTarget(com.orientechnologies.orient.core.sql.parser.OFromClause, com.orientechnologies.orient.core.sql.parser.OBinaryCompareOperator, java.lang.Object, com.orientechnologies.orient.core.command.OCommandContext, com.orientechnologies.orient.core.sql.parser.OExpression...) is executed.

Methods inherited from class com.orientechnologies.orient.core.sql.functions.OSQLFunctionAbstract

aggregateResults, config, filterResult, getDistributedStorageId, getMaxParams, getMinParams, getName, getResult, getSingleItem, getSingleProperty, mergeDistributedResult, returnDistributedResult, setResult, shouldMergeDistributedResult, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.orientechnologies.orient.core.sql.functions.OIndexableSQLFunction

searchFromTarget

Methods inherited from interface com.orientechnologies.orient.core.sql.functions.OSQLFunction

aggregateResults, config, execute, filterResult, getMaxParams, getMinParams, getName, getResult, getSyntax, mergeDistributedResult, setResult, shouldMergeDistributedResult

Constructor Detail

OLuceneSearchFunctionTemplate

public OLuceneSearchFunctionTemplate(String iName,
                                     int iMinParams,
                                     int iMaxParams)

Method Detail

canExecuteInline

public boolean canExecuteInline(OFromClause target,
                                OBinaryCompareOperator operator,
                                Object rightValue,
                                OCommandContext ctx,
                                OExpression... args)

Description copied from interface: OIndexableSQLFunction

checks if the function can be used even on single records, not as an indexed function (even if the index does not exist at all)

Specified by:

canExecuteInline in interface OIndexableSQLFunction

Parameters:

target - the query target

operator - the operator after the function, eg. in select from Foo where myFunction(name) > 4 the operator is >

rightValue - the value that has to be compared to the function result, eg. in select from Foo where myFunction(name) > 4 the right value is 4

ctx - the command context for this query

args - the function arguments, eg. in select from Foo where myFunction(name) > 4 the arguments are [name]

Returns:

true if the funciton can be calculated without the index. False otherwise

allowsIndexedExecution

public boolean allowsIndexedExecution(OFromClause target,
                                      OBinaryCompareOperator operator,
                                      Object rightValue,
                                      OCommandContext ctx,
                                      OExpression... args)

Description copied from interface: OIndexableSQLFunction

Checks if this function can be used to fetch data from this target and with these arguments (eg. if the index exists on this target and it's defined on these fields)

Specified by:

allowsIndexedExecution in interface OIndexableSQLFunction

Parameters:

target - the query target

operator - the operator after the function, eg. in select from Foo where myFunction(name) > 4 the operator is >

rightValue - the value that has to be compared to the function result, eg. in select from Foo where myFunction(name) > 4 the right value is 4

ctx - the command context for this query

args - the function arguments, eg. in select from Foo where myFunction(name) > 4 the arguments are [name]

Returns:

True if the funciton can be used to fetch from an index. False otherwise

shouldExecuteAfterSearch

public boolean shouldExecuteAfterSearch(OFromClause target,
                                        OBinaryCompareOperator operator,
                                        Object rightValue,
                                        OCommandContext ctx,
                                        OExpression... args)

Description copied from interface: OIndexableSQLFunction

Checks if this function should be called even if the method OIndexableSQLFunction.searchFromTarget(com.orientechnologies.orient.core.sql.parser.OFromClause, com.orientechnologies.orient.core.sql.parser.OBinaryCompareOperator, java.lang.Object, com.orientechnologies.orient.core.command.OCommandContext, com.orientechnologies.orient.core.sql.parser.OExpression...) is executed.

Specified by:

shouldExecuteAfterSearch in interface OIndexableSQLFunction

Parameters:

target - the query target

operator - the operator after the function, eg. in select from Foo where myFunction(name) > 4 the operator is >

rightValue - the value that has to be compared to the function result, eg. in select from Foo where myFunction(name) > 4 the right value is 4

ctx - the command context for this query

args - the function arguments, eg. in select from Foo where myFunction(name) > 4 the arguments are [name]

Returns:

True if this function should be called even if the method OIndexableSQLFunction.searchFromTarget(com.orientechnologies.orient.core.sql.parser.OFromClause, com.orientechnologies.orient.core.sql.parser.OBinaryCompareOperator, java.lang.Object, com.orientechnologies.orient.core.command.OCommandContext, com.orientechnologies.orient.core.sql.parser.OExpression...) is executed. False otherwise

estimate

public long estimate(OFromClause target,
                     OBinaryCompareOperator operator,
                     Object rightValue,
                     OCommandContext ctx,
                     OExpression... args)

Description copied from interface: OIndexableSQLFunction

estimates the number of entries returned by searchFromTarget() with these parameters

Specified by:

estimate in interface OIndexableSQLFunction

Parameters:

target - the query target

operator - the operator after the function, eg. in select from Foo where myFunction(name) > 4 the operator is >

rightValue - the value that has to be compared to the function result, eg. in select from Foo where myFunction(name) > 4 the right value is 4

ctx - the command context for this query

args - the function arguments, eg. in select from Foo where myFunction(name) > 4 the arguments are [name]

Returns:

an estimantion of how many entries will be returned by searchFromTarget() with these parameters, -1 if the estimation cannot be done

searchForIndex

protected abstract OLuceneFullTextIndex searchForIndex(OFromClause target,
                                                       OCommandContext ctx,
                                                       OExpression... args)