Module org.datanucleus
Class AbstractExpressionEvaluator
- java.lang.Object
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- org.datanucleus.store.query.expression.AbstractExpressionEvaluator
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- All Implemented Interfaces:
ExpressionEvaluator
- Direct Known Subclasses:
InMemoryExpressionEvaluator
public class AbstractExpressionEvaluator extends Object implements ExpressionEvaluator
Abstract evaluator for an expression. Provides a stack-like process, working its way through the expression tree. Provides methods processXXX that should be implemented by the subclass where it supports the particular operator or expression.
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Constructor Summary
Constructors Constructor Description AbstractExpressionEvaluator()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected Object
compileAdditiveMultiplicativeExpression(Expression expr)
protected Object
compileOrAndExpression(Expression expr)
This method deals with the OR/AND conditions.protected Object
compilePrimaryExpression(Expression expr)
protected Object
compileRelationalExpression(Expression expr)
Method to handle a relational expression comparing two expressions and returning a BooleanExpression.protected Object
compileUnaryExpression(Expression expr)
Object
evaluate(Expression expr)
Method to "evaluate" the expression.protected Object
processAddExpression(Expression expr)
Method to process the supplied ADD expression.protected Object
processAndExpression(Expression expr)
Method to process the supplied AND expression.protected Object
processBitAndExpression(Expression expr)
Method to process the supplied BITWISE AND expression.protected Object
processBitOrExpression(Expression expr)
Method to process the supplied BITWISE OR expression.protected Object
processBitXorExpression(Expression expr)
Method to process the supplied BITWISE XOR expression.protected Object
processCaseExpression(CaseExpression expr)
Method to process the supplied case expression.protected Object
processCastExpression(Expression expr)
Method to process the supplied cast expression.protected Object
processComExpression(Expression expr)
Method to process the supplied COM expression.protected Object
processCreatorExpression(CreatorExpression expr)
Method to process the supplied creator expression.protected Object
processDistinctExpression(Expression expr)
Method to process the supplied DISTINCT expression.protected Object
processDivExpression(Expression expr)
Method to process the supplied DIV expression.protected Object
processEqExpression(Expression expr)
Method to process the supplied EQ expression.protected Object
processGteqExpression(Expression expr)
Method to process the supplied GTEQ expression.protected Object
processGtExpression(Expression expr)
Method to process the supplied GT expression.protected Object
processInExpression(Expression expr)
Method to process the supplied IN expression.protected Object
processInvokeExpression(InvokeExpression expr)
Method to process the supplied invoke expression.protected Object
processIsExpression(Expression expr)
Method to process the supplied IS (instanceof) expression.protected Object
processIsnotExpression(Expression expr)
Method to process the supplied ISNOT (!instanceof) expression.protected Object
processLikeExpression(Expression expr)
Method to process the supplied LIKE expression.protected Object
processLiteral(Literal expr)
Method to process the supplied invoke expression.protected Object
processLteqExpression(Expression expr)
Method to process the supplied LTEQ expression.protected Object
processLtExpression(Expression expr)
Method to process the supplied LT expression.protected Object
processModExpression(Expression expr)
Method to process the supplied MOD expression.protected Object
processMulExpression(Expression expr)
Method to process the supplied MUL expression.protected Object
processNegExpression(Expression expr)
Method to process the supplied NEG expression.protected Object
processNoteqExpression(Expression expr)
Method to process the supplied NOTEQ expression.protected Object
processNotExpression(Expression expr)
Method to process the supplied NOT expression.protected Object
processNotInExpression(Expression expr)
Method to process the supplied NOT IN expression.protected Object
processOrExpression(Expression expr)
Method to process the supplied OR expression.protected Object
processParameterExpression(ParameterExpression expr)
Method to process the supplied parameter expression.protected Object
processPrimaryExpression(PrimaryExpression expr)
Method to process the supplied primary expression.protected Object
processSubExpression(Expression expr)
Method to process the supplied SUB expression.protected Object
processSubqueryExpression(SubqueryExpression expr)
Method to process the supplied subquery expression.protected Object
processVariableExpression(VariableExpression expr)
Method to process the supplied variable expression.
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Method Detail
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evaluate
public Object evaluate(Expression expr)
Method to "evaluate" the expression.- Specified by:
evaluate
in interfaceExpressionEvaluator
- Parameters:
expr
- The expression- Returns:
- The evaluated expression
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compileOrAndExpression
protected Object compileOrAndExpression(Expression expr)
This method deals with the OR/AND conditions. A condition specifies a combination of one or more expressions and logical (Boolean) operators and returns a value of TRUE, FALSE, or unknown- Parameters:
expr
- The other expression to or/and with- Returns:
- The updated expression
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compileRelationalExpression
protected Object compileRelationalExpression(Expression expr)
Method to handle a relational expression comparing two expressions and returning a BooleanExpression.- Parameters:
expr
- The (relational) expression- Returns:
- The processed expression
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compileAdditiveMultiplicativeExpression
protected Object compileAdditiveMultiplicativeExpression(Expression expr)
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compileUnaryExpression
protected Object compileUnaryExpression(Expression expr)
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compilePrimaryExpression
protected Object compilePrimaryExpression(Expression expr)
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processOrExpression
protected Object processOrExpression(Expression expr)
Method to process the supplied OR expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processAndExpression
protected Object processAndExpression(Expression expr)
Method to process the supplied AND expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processBitOrExpression
protected Object processBitOrExpression(Expression expr)
Method to process the supplied BITWISE OR expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processBitAndExpression
protected Object processBitAndExpression(Expression expr)
Method to process the supplied BITWISE AND expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processBitXorExpression
protected Object processBitXorExpression(Expression expr)
Method to process the supplied BITWISE XOR expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processEqExpression
protected Object processEqExpression(Expression expr)
Method to process the supplied EQ expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processNoteqExpression
protected Object processNoteqExpression(Expression expr)
Method to process the supplied NOTEQ expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processLikeExpression
protected Object processLikeExpression(Expression expr)
Method to process the supplied LIKE expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processGtExpression
protected Object processGtExpression(Expression expr)
Method to process the supplied GT expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processLtExpression
protected Object processLtExpression(Expression expr)
Method to process the supplied LT expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processGteqExpression
protected Object processGteqExpression(Expression expr)
Method to process the supplied GTEQ expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processLteqExpression
protected Object processLteqExpression(Expression expr)
Method to process the supplied LTEQ expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processIsExpression
protected Object processIsExpression(Expression expr)
Method to process the supplied IS (instanceof) expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processIsnotExpression
protected Object processIsnotExpression(Expression expr)
Method to process the supplied ISNOT (!instanceof) expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processInExpression
protected Object processInExpression(Expression expr)
Method to process the supplied IN expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processNotInExpression
protected Object processNotInExpression(Expression expr)
Method to process the supplied NOT IN expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processAddExpression
protected Object processAddExpression(Expression expr)
Method to process the supplied ADD expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processSubExpression
protected Object processSubExpression(Expression expr)
Method to process the supplied SUB expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processMulExpression
protected Object processMulExpression(Expression expr)
Method to process the supplied MUL expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processDivExpression
protected Object processDivExpression(Expression expr)
Method to process the supplied DIV expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processModExpression
protected Object processModExpression(Expression expr)
Method to process the supplied MOD expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processNegExpression
protected Object processNegExpression(Expression expr)
Method to process the supplied NEG expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processComExpression
protected Object processComExpression(Expression expr)
Method to process the supplied COM expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processNotExpression
protected Object processNotExpression(Expression expr)
Method to process the supplied NOT expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processDistinctExpression
protected Object processDistinctExpression(Expression expr)
Method to process the supplied DISTINCT expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processCreatorExpression
protected Object processCreatorExpression(CreatorExpression expr)
Method to process the supplied creator expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processPrimaryExpression
protected Object processPrimaryExpression(PrimaryExpression expr)
Method to process the supplied primary expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processParameterExpression
protected Object processParameterExpression(ParameterExpression expr)
Method to process the supplied parameter expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processVariableExpression
protected Object processVariableExpression(VariableExpression expr)
Method to process the supplied variable expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processSubqueryExpression
protected Object processSubqueryExpression(SubqueryExpression expr)
Method to process the supplied subquery expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processInvokeExpression
protected Object processInvokeExpression(InvokeExpression expr)
Method to process the supplied invoke expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processCastExpression
protected Object processCastExpression(Expression expr)
Method to process the supplied cast expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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processCaseExpression
protected Object processCaseExpression(CaseExpression expr)
Method to process the supplied case expression. To be implemented by subclasses.- Parameters:
expr
- The expression- Returns:
- The result
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