Package com.orientechnologies.orient.core.sql.operator

Class OQueryOperator

java.lang.Object

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

Direct Known Subclasses:

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	Description
static enum	OQueryOperator.ORDER

Field Summary

Fields

Modifier and Type	Field	Description
protected static final Class<?>[]	DEFAULT_OPERATORS_ORDER	Default operator order. can be used by additional operator to locate themself relatively to default ones.
final int	expectedRightWords
final boolean	expectsParameters
final String	keyword
final int	precedence
final boolean	unary

Constructor Summary

Constructors

Modifier	Constructor	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	Description
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
boolean	evaluate(Object iLeft, Object iRight, OCommandContext ctx)
String	getKeyword()
String	getSyntax()
boolean	isSupportingBinaryEvaluate()
boolean	isUnary()
String	toString()

Methods inherited from class java.lang.Object

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

Field Details

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 Details

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 Details

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()

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

canShortCircuit

public boolean canShortCircuit(Object l)

isSupportingBinaryEvaluate

public boolean isSupportingBinaryEvaluate()

getKeyword

public String getKeyword()

evaluate

public boolean evaluate(Object iLeft,
 Object iRight,
 OCommandContext ctx)