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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.ComparisonExpression
public final class ComparisonExpression
Only the values of like types are permitted to be compared. A type is like another type if they correspond to the same Java language type, or if one is a primitive Java language type and the other is the wrapped Java class type equivalent (e.g., int and Integer are like types in this sense).
There is one exception to this rule: it is valid to compare numeric values for which the rules of numeric promotion apply. Conditional expressions attempting to compare non-like type values are disallowed except for this numeric case.
Note that the arithmetic operators and comparison operators are permitted to be applied to state-fields and input parameters of the wrapped Java class equivalents to the primitive numeric Java types. Two entities of the same abstract schema type are equal if and only if they have the same primary key value. Only equality/inequality comparisons over enumeration constants are required to be supported.
JPA 1.0 - 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}
JPA 2.0 - 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}
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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ComparisonExpression(AbstractExpression parent,
java.lang.String identifier)
Creates a new ComparisonExpression . |
Method Summary | |
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void |
accept(ExpressionVisitor visitor)
Visits this Expression by the given visitor . |
java.lang.String |
getComparisonOperator()
Returns the comparison operator, which is either '=', '>', '>=', '<', '<=' or '<>'. |
JPQLQueryBNF |
getQueryBNF()
Returns the BNF of this Expression . |
protected boolean |
isParsingComplete(WordParser wordParser,
java.lang.String word,
Expression expression)
Determines whether the parsing is complete based on what is left in the given text. |
java.lang.String |
leftExpressionBNF()
Returns the unique identifier of the JPQLQueryBNF for the right expression. |
protected java.lang.String |
parseIdentifier(WordParser wordParser)
Parses the identifier of this 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.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 ComparisonExpression(AbstractExpression parent, java.lang.String identifier)
ComparisonExpression
.
parent
- The parent of this expressionidentifier
- The comparator identifierMethod 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 getComparisonOperator()
public JPQLQueryBNF getQueryBNF()
Expression
.
JPQLQueryBNF
, which represents the grammar of this Expression
protected boolean isParsingComplete(WordParser wordParser, java.lang.String word, Expression expression)
isParsingComplete
in class AbstractExpression
wordParser
- The text to parse based on the current position of the cursorword
- The word that was retrieved from the given text, which is the first word in the textexpression
- The Expression
that has already been parsed
true
if the text no longer can't be parsed by the current expression;
false
if more can be parsedpublic java.lang.String leftExpressionBNF()
JPQLQueryBNF
for the right expression.
leftExpressionBNF
in class CompoundExpression
protected java.lang.String parseIdentifier(WordParser wordParser)
parseIdentifier
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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