com.orientechnologies.orient.core.sql.operator

Class OQueryOperator

java.lang.Object

com.orientechnologies.orient.core.sql.operator.OQueryOperator

Direct Known Subclasses:

OQueryOperatorAnd, OQueryOperatorDivide, OQueryOperatorEquality, OQueryOperatorMinus, OQueryOperatorMod, OQueryOperatorMultiply, OQueryOperatorNot, OQueryOperatorOr, OQueryOperatorPlus, OQueryTargetOperator

public abstract class OQueryOperator
extends Object

Query Operators. Remember to handle the operator in OQueryItemCondition.

Author:

Luca Garulli (l.garulli--(at)--orientdb.com)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	OQueryOperator.ORDER

Field Summary

Fields

Modifier and Type	Field and Description
protected static Class<?>[]	DEFAULT_OPERATORS_ORDER Default operator order.
int	expectedRightWords
boolean	expectsParameters
String	keyword
int	precedence
boolean	unary

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	OQueryOperator(String iKeyword, int iPrecedence, boolean iUnary)
protected	OQueryOperator(String iKeyword, int iPrecedence, boolean iUnary, int iExpectedRightWords)
protected	OQueryOperator(String iKeyword, int iPrecedence, boolean iUnary, int iExpectedRightWords, boolean iExpectsParameters)

Method Summary

Modifier and Type	Method and Description
boolean	canBeMerged()
boolean	canShortCircuit(Object l)
OQueryOperator.ORDER	compare(OQueryOperator other) Check priority of this operator compare to given operator.
OQueryOperator	configure(List<String> iParams) Default State-less implementation: does not save parameters and just return itself
abstract Object	evaluateRecord(OIdentifiable iRecord, ODocument iCurrentResult, OSQLFilterCondition iCondition, Object iLeft, Object iRight, OCommandContext iContext, ODocumentSerializer serializer)
Stream<ORawPair<Object,ORID>>	executeIndexQuery(OCommandContext iContext, OIndex index, List<Object> keyParams, boolean ascSortOrder) Performs index query and returns index stream which presents subset of index data which corresponds to result of execution of given operator.
abstract ORID	getBeginRidRange(Object iLeft, Object iRight)
abstract ORID	getEndRidRange(Object iLeft, Object iRight)
abstract OIndexReuseType	getIndexReuseType(Object iLeft, Object iRight) Returns hint how index can be used to calculate result of operator execution.
OIndexSearchResult	getOIndexSearchResult(OClass iSchemaClass, OSQLFilterCondition iCondition, List<OIndexSearchResult> iIndexSearchResults, OCommandContext context)
String	getSyntax()
boolean	isSupportingBinaryEvaluate()
boolean	isUnary()
String	toString()
protected void	updateProfiler(OCommandContext iContext, OIndex index, List<Object> keyParams, OIndexDefinition indexDefinition)

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_OPERATORS_ORDER

protected static final Class<?>[] DEFAULT_OPERATORS_ORDER

Default operator order. can be used by additional operator to locate themself relatively to default ones.

WARNING: ORDER IS IMPORTANT TO AVOID SUB-STRING LIKE "IS" and AND "INSTANCEOF": INSTANCEOF MUST BE PLACED BEFORE! AND ALSO FOR PERFORMANCE (MOST USED BEFORE)

keyword

public final String keyword

precedence

public final int precedence

expectedRightWords

public final int expectedRightWords

unary

public final boolean unary

expectsParameters

public final boolean expectsParameters

Constructor Detail

OQueryOperator

protected OQueryOperator(String iKeyword,
                         int iPrecedence,
                         boolean iUnary)

OQueryOperator

protected OQueryOperator(String iKeyword,
                         int iPrecedence,
                         boolean iUnary,
                         int iExpectedRightWords)

OQueryOperator

protected OQueryOperator(String iKeyword,
                         int iPrecedence,
                         boolean iUnary,
                         int iExpectedRightWords,
                         boolean iExpectsParameters)

Method Detail

evaluateRecord

public abstract Object evaluateRecord(OIdentifiable iRecord,
                                      ODocument iCurrentResult,
                                      OSQLFilterCondition iCondition,
                                      Object iLeft,
                                      Object iRight,
                                      OCommandContext iContext,
                                      ODocumentSerializer serializer)

getIndexReuseType

public abstract OIndexReuseType getIndexReuseType(Object iLeft,
                                                  Object iRight)

Returns hint how index can be used to calculate result of operator execution.

Parameters:

iLeft - Value of left query parameter.

iRight - Value of right query parameter.

Returns:

Hint how index can be used to calculate result of operator execution.

getOIndexSearchResult

public OIndexSearchResult getOIndexSearchResult(OClass iSchemaClass,
                                                OSQLFilterCondition iCondition,
                                                List<OIndexSearchResult> iIndexSearchResults,
                                                OCommandContext context)

executeIndexQuery

public Stream<ORawPair<Object,ORID>> executeIndexQuery(OCommandContext iContext,
                                                       OIndex index,
                                                       List<Object> keyParams,
                                                       boolean ascSortOrder)

Performs index query and returns index stream which presents subset of index data which corresponds to result of execution of given operator.

Query that should be executed can be presented like: [[property0 = keyParam0] and [property1 = keyParam1] and] propertyN operator keyParamN.

It is supped that index which passed in as parameter is used to index properties listed above and responsibility of given method execute query using given parameters.

Multiple parameters are passed in to implement composite indexes support.

Parameters:

iContext -

index - Instance of index that will be used to calculate result of operator execution.

keyParams - Parameters of query is used to calculate query result.

ascSortOrder - Data returned by cursors should be sorted in ascending or descending order.

Returns:

Cursor instance if index can be used to evaluate result of execution of given operator and null otherwise.

toString

public String toString()

Overrides:

toString in class Object

configure

public OQueryOperator configure(List<String> iParams)

Default State-less implementation: does not save parameters and just return itself

Parameters:

iParams -

Returns:

getSyntax

public String getSyntax()

getBeginRidRange

public abstract ORID getBeginRidRange(Object iLeft,
                                      Object iRight)

getEndRidRange

public abstract ORID getEndRidRange(Object iLeft,
                                    Object iRight)

isUnary

public boolean isUnary()

compare

public OQueryOperator.ORDER compare(OQueryOperator other)

Check priority of this operator compare to given operator.

Parameters:

other -

Returns:

ORDER place of this operator compared to given operator

updateProfiler

protected void updateProfiler(OCommandContext iContext,
                              OIndex index,
                              List<Object> keyParams,
                              OIndexDefinition indexDefinition)

canShortCircuit

public boolean canShortCircuit(Object l)

canBeMerged

public boolean canBeMerged()

isSupportingBinaryEvaluate

public boolean isSupportingBinaryEvaluate()