ConfigurationEngineDefaults.Expression (Esper API Documentation)

java.lang.Object
- com.espertech.esper.client.ConfigurationEngineDefaults.Expression

All Implemented Interfaces:

Serializable

Enclosing class:

ConfigurationEngineDefaults
```
public static class ConfigurationEngineDefaults.Expression
extends Object
implements Serializable
```
Expression evaluation settings in the engine are for results of expressions.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor and Description

Expression()
Ctor.

Constructors
Constructor and Description
`Expression()` Ctor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`MathContext`	`getMathContext()` Returns the math context for big decimal operations, or null to leave the math context undefined.
`TimeZone`	`getTimeZone()` Returns the time zone for calendar operations.
`boolean`	`isDivisionByZeroReturnsNull()` Returns false (default) when division by zero returns Double.Infinity.
`boolean`	`isDuckTyping()` Returns true to indicate that duck typing is enable for the specific syntax where it is allowed (check the documentation).
`boolean`	`isExtendedAggregation()` Enables or disables non-SQL standard builtin aggregation functions.
`boolean`	`isIntegerDivision()` Returns false (the default) for integer division returning double values.
`boolean`	`isSelfSubselectPreeval()` Set to true (the default) to indicate that sub-selects within a statement are updated first when a new event arrives.
`boolean`	`isUdfCache()` By default true, indicates that user-defined functions cache return results if the parameter set is empty or has constant-only return values.
`void`	`setDivisionByZeroReturnsNull(boolean divisionByZeroReturnsNull)` Set to false (default) to have division by zero return Double.Infinity.
`void`	`setDuckTyping(boolean duckTyping)` Set to true to indicate that duck typing is enable for the specific syntax where it is allowed (check the documentation).
`void`	`setExtendedAggregation(boolean extendedAggregation)` Enables or disables non-SQL standard builtin aggregation functions.
`void`	`setIntegerDivision(boolean integerDivision)` Set to false (default) for integer division returning double values.
`void`	`setMathContext(MathContext mathContext)` Sets the math context for big decimal operations, or null to leave the math context undefined.
`void`	`setSelfSubselectPreeval(boolean selfSubselectPreeval)` Set to true (the default) to indicate that sub-selects within a statement are updated first when a new event arrives.
`void`	`setTimeZone(TimeZone timeZone)` Sets the time zone for calendar operations.
`void`	`setUdfCache(boolean udfCache)` Set to true (the default) to indicate that user-defined functions cache return results if the parameter set is empty or has constant-only return values.

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

- Constructor Detail
  - Expression
```
public Expression()
```
    Ctor.
- Method Detail
  - isIntegerDivision
```
public boolean isIntegerDivision()
```
    Returns false (the default) for integer division returning double values.
    Returns true to signal that Java-convention integer division semantics are used for divisions, whereas the division between two non-FP numbers returns only the whole number part of the result and any fractional part is dropped.
    
    Returns:
    
    indicator
  - setIntegerDivision
```
public void setIntegerDivision(boolean integerDivision)
```
    Set to false (default) for integer division returning double values. Set to true to signal the Java-convention integer division semantics are used for divisions, whereas the division between two non-FP numbers returns only the whole number part of the result and any fractional part is dropped.
    
    Parameters:
    
    integerDivision - true for integer division returning integer, false (default) for
  - isDivisionByZeroReturnsNull
```
public boolean isDivisionByZeroReturnsNull()
```
    Returns false (default) when division by zero returns Double.Infinity. Returns true when division by zero return null.
    If integer devision is set, then division by zero for non-FP operands also returns null.
    
    Returns:
    
    indicator for division-by-zero results
  - setDivisionByZeroReturnsNull
```
public void setDivisionByZeroReturnsNull(boolean divisionByZeroReturnsNull)
```
    Set to false (default) to have division by zero return Double.Infinity. Set to true to have division by zero return null.
    If integer devision is set, then division by zero for non-FP operands also returns null.
    
    Parameters:
    
    divisionByZeroReturnsNull - indicator for division-by-zero results
  - isUdfCache
```
public boolean isUdfCache()
```
    By default true, indicates that user-defined functions cache return results if the parameter set is empty or has constant-only return values.
    
    Returns:
    
    cache flag
  - setUdfCache
```
public void setUdfCache(boolean udfCache)
```
    Set to true (the default) to indicate that user-defined functions cache return results if the parameter set is empty or has constant-only return values.
    
    Parameters:
    
    udfCache - cache flag
  - isSelfSubselectPreeval
```
public boolean isSelfSubselectPreeval()
```
    Set to true (the default) to indicate that sub-selects within a statement are updated first when a new event arrives. This is only relevant for statements in which both subselects and the from-clause may react to the same exact event.
    
    Returns:
    
    indicator whether to evaluate sub-selects first or last on new event arrival
  - setSelfSubselectPreeval
```
public void setSelfSubselectPreeval(boolean selfSubselectPreeval)
```
    Set to true (the default) to indicate that sub-selects within a statement are updated first when a new event arrives. This is only relevant for statements in which both subselects and the from-clause may react to the same exact event.
    
    Parameters:
    
    selfSubselectPreeval - indicator whether to evaluate sub-selects first or last on new event arrival
  - isExtendedAggregation
```
public boolean isExtendedAggregation()
```
    Enables or disables non-SQL standard builtin aggregation functions.
    
    Returns:
    
    indicator
  - setExtendedAggregation
```
public void setExtendedAggregation(boolean extendedAggregation)
```
    Enables or disables non-SQL standard builtin aggregation functions.
    
    Parameters:
    
    extendedAggregation - indicator
  - isDuckTyping
```
public boolean isDuckTyping()
```
    Returns true to indicate that duck typing is enable for the specific syntax where it is allowed (check the documentation).
    
    Returns:
    
    indicator
  - setDuckTyping
```
public void setDuckTyping(boolean duckTyping)
```
    Set to true to indicate that duck typing is enable for the specific syntax where it is allowed (check the documentation).
    
    Parameters:
    
    duckTyping - indicator
  - getMathContext
```
public MathContext getMathContext()
```
    Returns the math context for big decimal operations, or null to leave the math context undefined.
    
    Returns:
    
    math context or null
  - setMathContext
```
public void setMathContext(MathContext mathContext)
```
    Sets the math context for big decimal operations, or null to leave the math context undefined.
    
    Parameters:
    
    mathContext - math context or null
  - getTimeZone
```
public TimeZone getTimeZone()
```
    Returns the time zone for calendar operations.
    
    Returns:
    
    time zone
  - setTimeZone
```
public void setTimeZone(TimeZone timeZone)
```
    Sets the time zone for calendar operations.
    
    Parameters:
    
    timeZone - time zone

Class ConfigurationEngineDefaults.Expression

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Expression

Method Detail

isIntegerDivision

setIntegerDivision

isDivisionByZeroReturnsNull

setDivisionByZeroReturnsNull

isUdfCache

setUdfCache

isSelfSubselectPreeval

setSelfSubselectPreeval

isExtendedAggregation

setExtendedAggregation

isDuckTyping

setDuckTyping

getMathContext

setMathContext

getTimeZone

setTimeZone