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java.lang.Objectorg.eclipse.persistence.jpa.jpql.parser.AbstractExpression
org.eclipse.persistence.jpa.jpql.parser.CompoundExpression
org.eclipse.persistence.jpa.jpql.parser.LogicalExpression
org.eclipse.persistence.jpa.jpql.parser.OrExpression
public final class OrExpression
The OR logical operator chains multiple criteria together. A valid operand of an OR operator must be one of: TRUE, FALSE, and NULL. The OR operator has a lower precedence than the AND operator.
NULL represents unknown. Therefore, if one operand is NULL and the other operand is TRUE the result is TRUE, because one TRUE operand is sufficient for a TRUE result. If one operand is NULL and the other operand is either FALSE or NULL, the result is NULL (unknown).
The following table shows how the OR operator is evaluated based on its two operands:
TRUE FALSE NULL TRUE TRUE TRUE TRUE FALSE TRUE FALSE NULL NULL TRUE NULL NULL
conditional_expression ::= conditional_expression OR conditional_term
Field Summary |
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Fields inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractExpression |
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COMMA, DOT, DOUBLE_QUOTE, LEFT_CURLY_BRACKET, LEFT_PARENTHESIS, NOT_DEFINED, RIGHT_CURLY_BRACKET, RIGHT_PARENTHESIS, SINGLE_QUOTE, SPACE, UNDERSCORE |
Constructor Summary | |
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OrExpression(AbstractExpression parent)
Creates a new OrExpression . |
Method Summary | |
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void |
accept(ExpressionVisitor visitor)
Visits this Expression by the given visitor . |
java.lang.String |
leftExpressionBNF()
Returns the unique identifier of the JPQLQueryBNF for the right expression. |
java.lang.String |
rightExpressionBNF()
Returns the unique identifier of the JPQLQueryBNF used to determine how to parse the
right expression. |
Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.LogicalExpression |
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getQueryBNF, isParsingComplete, parseIdentifier |
Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.CompoundExpression |
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acceptChildren, addChildrenTo, addOrderedChildrenTo, findQueryBNF, getActualIdentifier, getIdentifier, getLeftExpression, getRightExpression, hasLeftExpression, hasRightExpression, hasSpaceAfterIdentifier, parse, setLeftExpression, setRightExpression, toParsedText |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public OrExpression(AbstractExpression parent)
OrExpression
.
parent
- The parent of this expressionMethod Detail |
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public void accept(ExpressionVisitor visitor)
Expression
by the given visitor
.
visitor
- The ExpressionVisitor
to visit this objectpublic java.lang.String leftExpressionBNF()
JPQLQueryBNF
for the right expression.
leftExpressionBNF
in class CompoundExpression
public java.lang.String rightExpressionBNF()
JPQLQueryBNF
used to determine how to parse the
right expression.
rightExpressionBNF
in class CompoundExpression
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