org.eclipse.persistence.jpa.internal.jpql.parser
Class ComparisonExpressionBNF

java.lang.Object
org.eclipse.persistence.jpa.internal.jpql.parser.JPQLQueryBNF
org.eclipse.persistence.jpa.internal.jpql.parser.ComparisonExpressionBNF

public final class ComparisonExpressionBNF

extends JPQLQueryBNF

The query BNF for a comparison expression.

BNF: comparison_expression ::= string_expression comparison_operator {string_expression | all_or_any_expression} | boolean_expression { = | <> } {boolean_expression | all_or_any_expression} | enum_expression { = | <> } {enum_expression | all_or_any_expression} | datetime_expression comparison_operator {datetime_expression | all_or_any_expression} | entity_expression { = | <> } {entity_expression | all_or_any_expression} | arithmetic_expression comparison_operator {arithmetic_expression | all_or_any_expression} | entity_type_expression { = | <> } entity_type_expression}

Since:

2.3

Version:

2.3

Author:

Pascal Filion

Field Summary

static java.lang.String

ID The unique identifier of this BNF rule.

Constructor Summary

ComparisonExpressionBNF()
Creates a new ComparisonExpressionBNF.

Method Summary

(package private) java.lang.String	getFallbackBNFId() When parsing the query and no JPQLQueryBNFs can help to parse the query, then it will fall back on this one.
(package private) java.lang.String	getFallbackExpressionFactoryId() Returns the unique identifier of the ExpressionFactory to use when the fall back BNF ID is not null.
(package private) void	initialize() Initializes this BNF rule by registering child BNF rules and expression factories.
boolean	isCompound() Determines whether this BNF has child BNFs registered only to properly parse a query or if the child BNFs are part of the BNF.

Methods inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.JPQLQueryBNF

addChildren, children, expressionFactory, expressionFactoryIds, getId, handleAggregate, handleCollection, hasIdentifier, identifiers, nonCompoundChildren, registerChild, registerExpressionFactory, toString

Methods inherited from class java.lang.Object

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

Field Detail

ID

public static final java.lang.String ID

The unique identifier of this BNF rule.

See Also:

Constant Field Values

Constructor Detail

ComparisonExpressionBNF

public ComparisonExpressionBNF()

Creates a new ComparisonExpressionBNF.

Method Detail

getFallbackBNFId

java.lang.String getFallbackBNFId()

When parsing the query and no JPQLQueryBNFs can help to parse the query, then it will fall back on this one.

Overrides:

getFallbackBNFId in class JPQLQueryBNF

Returns:

The unique identifier of the JPQLQueryBNF to use in the last resort

getFallbackExpressionFactoryId

java.lang.String getFallbackExpressionFactoryId()

Returns the unique identifier of the ExpressionFactory to use when the fall back BNF ID is not null. This will be used to parse a portion of the query when the registered expression factories cannot parse it.

Note: This method is only called if JPQLQueryBNF.getFallbackBNFId() does not return null.

Overrides:

getFallbackExpressionFactoryId in class JPQLQueryBNF

Returns:

The unique identifier of the ExpressionFactory

initialize

void initialize()

Initializes this BNF rule by registering child BNF rules and expression factories.

Overrides:

initialize in class JPQLQueryBNF

isCompound

public boolean isCompound()

Determines whether this BNF has child BNFs registered only to properly parse a query or if the child BNFs are part of the BNF. An example if a compound BNF is BetweenExpressionBNF, it registers a series of children BNFs but they shouldn't be used to determine if they are part of that BNF since the comparator identifiers are.

Overrides:

isCompound in class JPQLQueryBNF

Returns:

false by default