org.eclipse.persistence.jpa.jpql.parser
Class NullComparisonExpressionFactory

java.lang.Object
  org.eclipse.persistence.jpa.jpql.parser.ExpressionFactory
      org.eclipse.persistence.jpa.jpql.parser.NullComparisonExpressionFactory

All Implemented Interfaces:

java.lang.Comparable<ExpressionFactory>

public final class NullComparisonExpressionFactory
extends ExpressionFactory

This NullComparisonExpressionFactory creates a new NullComparisonExpression when the portion of the query to parse starts with IS NULL or IS NOT NULL.

Version:

2.4

See Also:

NullComparisonExpression

Author:

Pascal Filion

Since:

2.3

Field Summary

static java.lang.String

ID The unique identifier of this NullComparisonExpression.

Constructor Summary

NullComparisonExpressionFactory()
Creates a new NullComparisonExpressionFactory.

Method Summary

protected AbstractExpression

buildExpression(AbstractExpression parent, WordParser wordParser, java.lang.String word, JPQLQueryBNF queryBNF, AbstractExpression expression, boolean tolerant) Creates a new Expression.

Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.ExpressionFactory

compareTo, equals, getExpressionRegistry, getFallBackExpressionFactoryId, getId, hashCode, identifiers, setFallBackExpressionFactory, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

ID

public static final java.lang.String ID

The unique identifier of this NullComparisonExpression.

See Also:

Constant Field Values

Constructor Detail

NullComparisonExpressionFactory

public NullComparisonExpressionFactory()

Creates a new NullComparisonExpressionFactory.

Method Detail

buildExpression

protected AbstractExpression buildExpression(AbstractExpression parent,
                                             WordParser wordParser,
                                             java.lang.String word,
                                             JPQLQueryBNF queryBNF,
                                             AbstractExpression expression,
                                             boolean tolerant)

Creates a new Expression.

Specified by:

buildExpression in class ExpressionFactory

Parameters:

parent - The parent expression

wordParser - The text to parse based on the current position of the cursor

word - The current word to parse

queryBNF - The BNF grammar that was used to identifier this factory to be capable to parse a portion of the query

expression - During the parsing, it is possible the first part of an expression was parsed which needs to be used as a sub-expression of the newly created expression

Returns:

A new Expression representing a portion or the totality of the given text