Package com.tangosol.coherence.dslquery.operator

Class EqualsOperator

java.lang.Object

com.tangosol.coherence.dslquery.operator.BaseOperator<ComparisonFilter>

com.tangosol.coherence.dslquery.operator.ComparisonOperator

com.tangosol.coherence.dslquery.operator.EqualsOperator

public class EqualsOperator
extends ComparisonOperator

An operator implementation representing the equality operator.

Since:

Coherence 12.2.1

Author:

jk 2013.12.03

Field Summary

Fields

Modifier and Type	Field	Description
static EqualsOperator	INSTANCE	An instance of the EqualsOperator.

Fields inherited from class com.tangosol.coherence.dslquery.operator.BaseOperator

f_asAlias, f_fConditional, f_sSymbol

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	EqualsOperator()	Construct a EqualsOperator.

Method Summary

Modifier and Type	Method	Description
void	addToTokenTable(TokenTable tokenTable)	Add this operator to the given TokenTable.
ComparisonOperator	flip()	Return the operator to use if this operation needs to be flipped due to the CohQL statement having the literal on the left hand side.
ComparisonFilter	makeFilter(Term termLeft, Term termRight, TermWalker walker)	Create a Filter for this BaseOperator using the specified left and right Terms.
ComparisonFilter	makeFilter(Object oLeft, Object oRight)	Create a Filter for this BaseOperator using the specified left and right values.

Methods inherited from class com.tangosol.coherence.dslquery.operator.BaseOperator

addAliases, getAliases, getSymbol, isConditional, makeExtractor, makeExtractor, toString, unmodifiableSet

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final EqualsOperator INSTANCE

An instance of the EqualsOperator.

Constructor Detail

EqualsOperator

protected EqualsOperator()

Construct a EqualsOperator.

Method Detail

flip

public ComparisonOperator flip()

Description copied from class: ComparisonOperator

Return the operator to use if this operation needs to be flipped due to the CohQL statement having the literal on the left hand side. For example if the statement was "2 == foo" this would need to be flipped to put the literal on the right so giving the statement "foo == 2" and the flipped operator is still ==. But for another example such as "2 >= foo" flipping this give the statement "foo <= 2" so the operator has changed from >= to <=

Specified by:

flip in class ComparisonOperator

Returns:

the operator to use if this operation needs to be flipped due to the CohQL statement having the literal on the left hand side.

makeFilter

public ComparisonFilter makeFilter(Term termLeft,
                                   Term termRight,
                                   TermWalker walker)

Description copied from class: BaseOperator

Create a Filter for this BaseOperator using the specified left and right Terms.

Note: This method should be thread safe as operators are stored in a static map so may be called by multiple threads.

Overrides:

makeFilter in class ComparisonOperator

Parameters:

termLeft - the left term to use to build a Filter

termRight - the right term to use to build a Filter

walker - the TermWalker to use to process the left and right terms

Returns:

a Filter representing this operation.

makeFilter

public ComparisonFilter makeFilter(Object oLeft,
                                   Object oRight)

Description copied from class: BaseOperator

Create a Filter for this BaseOperator using the specified left and right values.

Note: This method should be thread safe as operators are stored in a static map so may be called by multiple threads.

Overrides:

makeFilter in class BaseOperator<ComparisonFilter>

Parameters:

oLeft - the left value to use to build a Filter

oRight - the right value to use to build a Filter

Returns:

a Filter representing this operation

addToTokenTable

public void addToTokenTable(TokenTable tokenTable)

Description copied from class: BaseOperator

Add this operator to the given TokenTable. This typically means adding this operator using its symbol and also adding any aliases.

Specified by:

addToTokenTable in class BaseOperator<ComparisonFilter>

Parameters:

tokenTable - the TokenTable to add this operator to