AbstractExpressionEvaluator (DataNucleus Core 3.2.10 API)

java.lang.Object
- org.datanucleus.query.evaluator.AbstractExpressionEvaluator

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.

Constructor Summary

Constructors
Constructor and Description

AbstractExpressionEvaluator()

Constructors
Constructor and Description
`AbstractExpressionEvaluator()`

Method Summary

Methods
Modifier and Type	Method and 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`	`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.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AbstractExpressionEvaluator
```
public AbstractExpressionEvaluator()
```
- Method Detail
  - evaluate
```
public Object evaluate(Expression expr)
```
    Method to "evaluate" the expression.
    
    Specified by:
    
    evaluate in interface ExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The evaluated expression
  - 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
  - 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
  - compileAdditiveMultiplicativeExpression
```
protected Object compileAdditiveMultiplicativeExpression(Expression expr)
```
  - compileUnaryExpression
```
protected Object compileUnaryExpression(Expression expr)
```
  - compilePrimaryExpression
```
protected Object compilePrimaryExpression(Expression expr)
```
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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
  - processLiteral
```
protected Object processLiteral(Literal expr)
```
    Method to process the supplied invoke expression. To be implemented by subclasses.
    
    Parameters:
    expr - The expression
    
    Returns:
    The result

Class AbstractExpressionEvaluator

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

AbstractExpressionEvaluator

Method Detail

evaluate

compileOrAndExpression

compileRelationalExpression

compileAdditiveMultiplicativeExpression

compileUnaryExpression

compilePrimaryExpression

processOrExpression

processAndExpression

processEqExpression

processNoteqExpression

processLikeExpression

processGtExpression

processLtExpression

processGteqExpression

processLteqExpression

processIsExpression

processIsnotExpression

processInExpression

processNotInExpression

processAddExpression

processSubExpression

processMulExpression

processDivExpression

processModExpression

processNegExpression

processComExpression

processNotExpression

processDistinctExpression

processCreatorExpression

processPrimaryExpression

processParameterExpression

processVariableExpression

processSubqueryExpression

processInvokeExpression

processCastExpression

processCaseExpression

processLiteral