MultiExpressionEvaluator.CacheExpression (ActiveMQ :: Client 5.17.2 API)

java.lang.Object
- org.apache.activemq.filter.UnaryExpression
- - org.apache.activemq.filter.MultiExpressionEvaluator.CacheExpression

All Implemented Interfaces:

Expression

Enclosing class:

MultiExpressionEvaluator
```
public class MultiExpressionEvaluator.CacheExpression
extends UnaryExpression
```
A UnaryExpression that caches the result of the nested expression. The cached value is valid if the CacheExpression.cview==MultiExpressionEvaluator.view

Field Summary
- Fields inherited from class org.apache.activemq.filter.UnaryExpression
  right

Constructor Summary

Constructors
Constructor Description

CacheExpression(Expression realExpression)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(Object o)`	TODO: more efficient hashCode()
`Object`	`evaluate(MessageEvaluationContext message)`
`String`	`getExpressionSymbol()`	Returns the symbol that represents this binary expression.
`int`	`hashCode()`	TODO: more efficient hashCode()
`String`	`toString()`

Methods inherited from class org.apache.activemq.filter.UnaryExpression
createBooleanCast, createInExpression, createNegate, createNOT, createXPath, createXQuery, getRight, setRight

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

- Constructor Detail
  - CacheExpression
```
public CacheExpression(Expression realExpression)
```
- Method Detail
  - evaluate
```
public Object evaluate(MessageEvaluationContext message)
                throws JMSException
```
    Returns:
    
    the value of this expression
    
    Throws:
    
    JMSException
    
    See Also:
    
    Expression.evaluate(MessageEvaluationContext)
  - hashCode
```
public int hashCode()
```
    Description copied from class: UnaryExpression
    
    TODO: more efficient hashCode()
    
    Overrides:
    
    hashCode in class UnaryExpression
    
    See Also:
    
    Object.hashCode()
  - equals
```
public boolean equals(Object o)
```
    Description copied from class: UnaryExpression
    
    TODO: more efficient hashCode()
    
    Overrides:
    
    equals in class UnaryExpression
    
    See Also:
    
    Object.equals(java.lang.Object)
  - getExpressionSymbol
```
public String getExpressionSymbol()
```
    Description copied from class: UnaryExpression
    
    Returns the symbol that represents this binary expression. For example, addition is represented by "+"
    
    Specified by:
    
    getExpressionSymbol in class UnaryExpression
    
    Returns:
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class UnaryExpression
    
    See Also:
    
    Object.toString()