com.espertech.esper.client.soda

Class ConstantExpression

java.lang.Object

com.espertech.esper.client.soda.ExpressionBase

com.espertech.esper.client.soda.ConstantExpression

All Implemented Interfaces:

Expression, Serializable

public class ConstantExpression
extends ExpressionBase

Constant value returns a fixed value for use in expressions.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ConstantExpression() Ctor.
ConstantExpression(Object constant) Ctor.
ConstantExpression(Object constant, String constantType) Ctor.

Method Summary

Modifier and Type	Method and Description
Object	getConstant() Returns the constant value that the expression represents.
String	getConstantType() Returns the type of the constant.
ExpressionPrecedenceEnum	getPrecedence() Returns precedence.
void	setConstant(Object constant) Sets the constant value that the expression represents.
void	setConstantType(String constantType) Sets the type of the constant.
void	toPrecedenceFreeEPL(StringWriter writer) Renders the expressions and all it's child expression, in full tree depth, as a string in language syntax.

Methods inherited from class com.espertech.esper.client.soda.ExpressionBase

addChild, getChildren, getTreeObjectName, renderAggregation, setChildren, setTreeObjectName, toEPL, toPrecedenceFreeEPL, toPrecedenceFreeEPL

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ConstantExpression

public ConstantExpression()

Ctor.

ConstantExpression

public ConstantExpression(Object constant)

Ctor.

Parameters:

constant - is the constant value, or null to represent the null value

ConstantExpression

public ConstantExpression(Object constant,
                          String constantType)

Ctor.

Parameters:

constant - value

constantType - type

Method Detail

getConstantType

public String getConstantType()

Returns the type of the constant.

Returns:

type

setConstantType

public void setConstantType(String constantType)

Sets the type of the constant.

Parameters:

constantType - type

getPrecedence

public ExpressionPrecedenceEnum getPrecedence()

Description copied from interface: Expression

Returns precedence.

Returns:

precedence

toPrecedenceFreeEPL

public void toPrecedenceFreeEPL(StringWriter writer)

Description copied from class: ExpressionBase

Renders the expressions and all it's child expression, in full tree depth, as a string in language syntax.

Specified by:

toPrecedenceFreeEPL in class ExpressionBase

Parameters:

writer - is the output to use

getConstant

public Object getConstant()

Returns the constant value that the expression represents.

Returns:

value of constant

setConstant

public void setConstant(Object constant)

Sets the constant value that the expression represents.

Parameters:

constant - is the value, or null to indicate the null value