org.springframework.binding.expression.support

Class StaticExpression

java.lang.Object

org.springframework.binding.expression.support.StaticExpression

All Implemented Interfaces:

Expression

public final class StaticExpression
extends java.lang.Object
implements Expression

A simple expression evaluator that just returns a fixed result on each evaluation.

Author:

Keith Donald

Constructor Summary

Constructors

Constructor and Description
StaticExpression(java.lang.Object value) Create a static evaluator for the given value.

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o)
java.lang.String	getExpressionString() Returns the original string used to create this expression, unmodified.
java.lang.Object	getValue(java.lang.Object context) Evaluate this expression in the provided context and return the result of evaluation.
java.lang.Class<?>	getValueType(java.lang.Object context) Returns the most general type that can be passed to the Expression.setValue(Object, Object) method for the given context.
int	hashCode()
void	setExpressionString(java.lang.String expressionString) Sets the static expression string.
void	setValue(java.lang.Object context, java.lang.Object value) Set this expression in the provided context to the value provided.
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

StaticExpression

public StaticExpression(java.lang.Object value)

Create a static evaluator for the given value.

Parameters:

value - the value

Method Detail

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

getValue

public java.lang.Object getValue(java.lang.Object context)
                          throws EvaluationException

Description copied from interface: Expression

Evaluate this expression in the provided context and return the result of evaluation.

Specified by:

getValue in interface Expression

Parameters:

context - the context to evaluate this expression in

Returns:

the evaluation result

Throws:

EvaluationException - an exception occurred during expression evaluation

setValue

public void setValue(java.lang.Object context,
                     java.lang.Object value)
              throws EvaluationException

Description copied from interface: Expression

Set this expression in the provided context to the value provided.

Specified by:

setValue in interface Expression

Parameters:

context - the context on which the new value should be set

value - the new value to set

Throws:

EvaluationException - an exception occurred during expression evaluation

getValueType

public java.lang.Class<?> getValueType(java.lang.Object context)

Description copied from interface: Expression

Returns the most general type that can be passed to the Expression.setValue(Object, Object) method for the given context.

Specified by:

getValueType in interface Expression

Parameters:

context - the context to evaluate

Returns:

the most general type of value that can be set on this context, or null if the type information cannot be determined

getExpressionString

public java.lang.String getExpressionString()

Description copied from interface: Expression

Returns the original string used to create this expression, unmodified.

Specified by:

getExpressionString in interface Expression

Returns:

the original expression string

setExpressionString

public void setExpressionString(java.lang.String expressionString)

Sets the static expression string.

Parameters:

expressionString - the static expression string

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object