BooleanFunctionCallExpr (ActiveMQ :: Client 5.18.6 API)

java.lang.Object
- org.apache.activemq.filter.FunctionCallExpression
- - org.apache.activemq.filter.BooleanFunctionCallExpr

All Implemented Interfaces:

BooleanExpression, Expression
```
public class BooleanFunctionCallExpr
extends FunctionCallExpression
implements BooleanExpression
```
Function call expression that evaluates to a boolean value. Selector parsing requires BooleanExpression objects for Boolean expressions, such as operands to AND, and as the final result of a selector. This provides that interface for function call expressions that resolve to Boolean values.
If a function can return different types at evaluation-time, the function implementation needs to decide whether it supports casting to Boolean at parse-time.

See Also:

FunctionCallExpression.createFunctionCall(java.lang.String, java.util.List<org.apache.activemq.filter.Expression>)

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.activemq.filter.FunctionCallExpression
  FunctionCallExpression.functionRegistration, FunctionCallExpression.invalidFunctionExpressionException

Field Summary
- Fields inherited from class org.apache.activemq.filter.FunctionCallExpression
  arguments, filterFunc, functionName, functionRegistry

Constructor Summary

Constructors
Constructor	Description
`BooleanFunctionCallExpr(String func_name, List<Expression> args)`	Constructs a function call expression with the named filter function and arguments, which returns a boolean result.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`matches(MessageEvaluationContext message_ctx)`	Evaluate the function call expression, in the given context, and return an indication of whether the expression "matches" (i.e. evaluates to true).

Methods inherited from class org.apache.activemq.filter.FunctionCallExpression
createFunctionCall, deregisterFunction, evaluate, getArgument, getNumArguments, registerFunction, toString

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

Methods inherited from interface org.apache.activemq.filter.Expression
evaluate

- Constructor Detail
  - BooleanFunctionCallExpr
```
public BooleanFunctionCallExpr(String func_name,
                               List<Expression> args)
                        throws FunctionCallExpression.invalidFunctionExpressionException
```
    Constructs a function call expression with the named filter function and arguments, which returns a boolean result.
    
    Parameters:
    
    func_name - - Name of the filter function to be called when evaluated.
    
    args - - List of argument expressions passed to the function.
    
    Throws:
    
    FunctionCallExpression.invalidFunctionExpressionException
- Method Detail
  - matches
```
public boolean matches(MessageEvaluationContext message_ctx)
                throws javax.jms.JMSException
```
    Evaluate the function call expression, in the given context, and return an indication of whether the expression "matches" (i.e. evaluates to true).
    
    Specified by:
    
    matches in interface BooleanExpression
    
    Parameters:
    
    message_ctx - - message context against which the expression will be evaluated.
    
    Returns:
    
    the boolean evaluation of the function call expression.
    
    Throws:
    
    javax.jms.JMSException