InMemoryExpressionEvaluator (DataNucleus Core 3.2.11 API)

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

All Implemented Interfaces:

ExpressionEvaluator
```
public class InMemoryExpressionEvaluator
extends AbstractExpressionEvaluator
```
Class providing evaluation of java "string-based" queries in-memory.

Field Summary

Fields
Modifier and Type Field and Description

protected static Localiser LOCALISER
Localisation utility for output messages

Fields
Modifier and Type	Field and Description
`protected static Localiser`	`LOCALISER` Localisation utility for output messages

Constructor Summary

Constructors
Constructor and Description
`InMemoryExpressionEvaluator(ExecutionContext ec, Map params, Map<String,Object> state, Imports imports, ClassLoaderResolver clr, String candidateAlias, String queryLang)` Constructor for an in-memory evaluator.

Method Summary

Methods
Modifier and Type	Method and Description
`int`	`getIntegerForLiteral(Literal lit)` Convenience method to get an int value from the supplied literal.
`Map`	`getParameterValues()`
`String`	`getQueryLanguage()`
`Object`	`getValueForInvokeExpression(InvokeExpression invokeExpr)` Method to evaluate an InvokeExpression.
`Object`	`getValueForPrimaryExpression(PrimaryExpression primExpr)` Convenience method to get the value for a PrimaryExpression.
`Object`	`getValueForVariableExpression(VariableExpression varExpr)` Convenience method to get the (current) value for a VariableExpression.
`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`	`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`	`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`	`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`	`processVariableExpression(VariableExpression expr)` Method to process the supplied variable expression.
`void`	`removeVariableValue(String id)` Method to remove a variable value.
`void`	`setVariableValue(String id, Object value)` Method to set the value for a variable.

Methods inherited from class org.datanucleus.query.evaluator.AbstractExpressionEvaluator
compileAdditiveMultiplicativeExpression, compileOrAndExpression, compilePrimaryExpression, compileRelationalExpression, compileUnaryExpression, evaluate, processDistinctExpression, processInExpression, processNotInExpression, processSubqueryExpression

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

- Field Detail
  - LOCALISER
```
protected static final Localiser LOCALISER
```
    Localisation utility for output messages
- Constructor Detail
  - InMemoryExpressionEvaluator
```
public InMemoryExpressionEvaluator(ExecutionContext ec,
                           Map params,
                           Map<String,Object> state,
                           Imports imports,
                           ClassLoaderResolver clr,
                           String candidateAlias,
                           String queryLang)
```
    Constructor for an in-memory evaluator.
    
    Parameters:
    ec - ExecutionContext
    params - Input parameters
    state - Map of state values keyed by their symbolic name
    imports - Any imports
    clr - ClassLoader resolver
    candidateAlias - Alias for the candidate class. With JDOQL this is "this".
- Method Detail
  - getParameterValues
```
public Map getParameterValues()
```
  - getQueryLanguage
```
public String getQueryLanguage()
```
  - processAndExpression
```
protected Object processAndExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied AND expression. To be implemented by subclasses.
    
    Overrides:
    
    processAndExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processEqExpression
```
protected Object processEqExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied EQ expression. To be implemented by subclasses.
    
    Overrides:
    
    processEqExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processLikeExpression
```
protected Object processLikeExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied LIKE expression. To be implemented by subclasses.
    
    Overrides:
    
    processLikeExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processNoteqExpression
```
protected Object processNoteqExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied NOTEQ expression. To be implemented by subclasses.
    
    Overrides:
    
    processNoteqExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processOrExpression
```
protected Object processOrExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied OR expression. To be implemented by subclasses.
    
    Overrides:
    
    processOrExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processGteqExpression
```
protected Object processGteqExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied GTEQ expression. To be implemented by subclasses.
    
    Overrides:
    
    processGteqExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processGtExpression
```
protected Object processGtExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied GT expression. To be implemented by subclasses.
    
    Overrides:
    
    processGtExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processIsExpression
```
protected Object processIsExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied IS (instanceof) expression. To be implemented by subclasses.
    
    Overrides:
    
    processIsExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processIsnotExpression
```
protected Object processIsnotExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied ISNOT (!instanceof) expression. To be implemented by subclasses.
    
    Overrides:
    
    processIsnotExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processCastExpression
```
protected Object processCastExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied cast expression. To be implemented by subclasses.
    
    Overrides:
    
    processCastExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processLteqExpression
```
protected Object processLteqExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied LTEQ expression. To be implemented by subclasses.
    
    Overrides:
    
    processLteqExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processLtExpression
```
protected Object processLtExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied LT expression. To be implemented by subclasses.
    
    Overrides:
    
    processLtExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processAddExpression
```
protected Object processAddExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied ADD expression. To be implemented by subclasses.
    
    Overrides:
    
    processAddExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processSubExpression
```
protected Object processSubExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied SUB expression. To be implemented by subclasses.
    
    Overrides:
    
    processSubExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processDivExpression
```
protected Object processDivExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied DIV expression. To be implemented by subclasses.
    
    Overrides:
    
    processDivExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processModExpression
```
protected Object processModExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied MOD expression. To be implemented by subclasses.
    
    Overrides:
    
    processModExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processMulExpression
```
protected Object processMulExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied MUL expression. To be implemented by subclasses.
    
    Overrides:
    
    processMulExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processNegExpression
```
protected Object processNegExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied NEG expression. To be implemented by subclasses.
    
    Overrides:
    
    processNegExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processComExpression
```
protected Object processComExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied COM expression. To be implemented by subclasses.
    
    Overrides:
    
    processComExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processNotExpression
```
protected Object processNotExpression(Expression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied NOT expression. To be implemented by subclasses.
    
    Overrides:
    
    processNotExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processCreatorExpression
```
protected Object processCreatorExpression(CreatorExpression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied creator expression. To be implemented by subclasses.
    
    Overrides:
    
    processCreatorExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processInvokeExpression
```
protected Object processInvokeExpression(InvokeExpression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied invoke expression. To be implemented by subclasses.
    
    Overrides:
    
    processInvokeExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processLiteral
```
protected Object processLiteral(Literal expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied invoke expression. To be implemented by subclasses.
    
    Overrides:
    
    processLiteral in class AbstractExpressionEvaluator
    
    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.
    
    Overrides:
    
    processVariableExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processParameterExpression
```
protected Object processParameterExpression(ParameterExpression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied parameter expression. To be implemented by subclasses.
    
    Overrides:
    
    processParameterExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processPrimaryExpression
```
protected Object processPrimaryExpression(PrimaryExpression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied primary expression. To be implemented by subclasses.
    
    Overrides:
    
    processPrimaryExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - processCaseExpression
```
protected Object processCaseExpression(CaseExpression expr)
```
    Description copied from class: AbstractExpressionEvaluator
    
    Method to process the supplied case expression. To be implemented by subclasses.
    
    Overrides:
    
    processCaseExpression in class AbstractExpressionEvaluator
    
    Parameters:
    expr - The expression
    
    Returns:
    The result
  - getValueForInvokeExpression
```
public Object getValueForInvokeExpression(InvokeExpression invokeExpr)
```
    Method to evaluate an InvokeExpression. Will navigate along chained invocations, evaluating the first one, then the second one etc until it gets the value for the passed in expression.
    
    Parameters:
    invokeExpr - The InvokeExpression
    
    Returns:
    The value
  - getIntegerForLiteral
```
public int getIntegerForLiteral(Literal lit)
```
    Convenience method to get an int value from the supplied literal. Returns a value if it is convertible into an int.
    
    Parameters:
    lit - The literal
    
    Returns:
    The int value
    
    Throws:
    
    NucleusException - if impossible to convert into an int
  - getValueForPrimaryExpression
```
public Object getValueForPrimaryExpression(PrimaryExpression primExpr)
```
    Convenience method to get the value for a PrimaryExpression.
    
    Parameters:
    primExpr - Expression
    
    Returns:
    The value in the object for this expression
  - setVariableValue
```
public void setVariableValue(String id,
                    Object value)
```
    Method to set the value for a variable.
    
    Parameters:
    id - Id of the variable
    value - The value to use
  - removeVariableValue
```
public void removeVariableValue(String id)
```
    Method to remove a variable value.
    
    Parameters:
    id - The id of the variable
  - getValueForVariableExpression
```
public Object getValueForVariableExpression(VariableExpression varExpr)
```
    Convenience method to get the (current) value for a VariableExpression. If the variable has no current value, throws a VariableNotSetException.
    
    Parameters:
    varExpr - Variable Expression
    
    Returns:
    The value
    
    Throws:
    
    VariableNotSetException - Thrown when the variable has no value currently set.

Class InMemoryExpressionEvaluator

Field Summary

Constructor Summary

Method Summary

Methods inherited from class org.datanucleus.query.evaluator.AbstractExpressionEvaluator

Methods inherited from class java.lang.Object

Field Detail

LOCALISER

Constructor Detail

InMemoryExpressionEvaluator

Method Detail

getParameterValues

getQueryLanguage

processAndExpression

processEqExpression

processLikeExpression

processNoteqExpression

processOrExpression

processGteqExpression

processGtExpression

processIsExpression

processIsnotExpression

processCastExpression

processLteqExpression

processLtExpression

processAddExpression

processSubExpression

processDivExpression

processModExpression

processMulExpression

processNegExpression

processComExpression

processNotExpression

processCreatorExpression

processInvokeExpression

processLiteral

processVariableExpression

processParameterExpression

processPrimaryExpression

processCaseExpression

getValueForInvokeExpression

getIntegerForLiteral

getValueForPrimaryExpression

setVariableValue

removeVariableValue

getValueForVariableExpression