org.mvel2.integration

Interface Interceptor

public interface Interceptor

An interceptor can be used to decorate functionality into an expression or to hook into external functionality, such as to log an event or fire some other event.

Author:

Christopher Brock

Field Summary

Fields

Modifier and Type	Field and Description
static int	END
static int	NORMAL_FLOW
static int	SKIP

Method Summary

Methods

Modifier and Type	Method and Description
int	doAfter(Object exitStackValue, ASTNode node, VariableResolverFactory factory) This method is called after the wrapped statement has completed.
int	doBefore(ASTNode node, VariableResolverFactory factory) This method is executed before the wrapped statement.

Field Detail

NORMAL_FLOW

static final int NORMAL_FLOW

See Also:

Constant Field Values

SKIP

static final int SKIP

See Also:

Constant Field Values

END

static final int END

See Also:

Constant Field Values

Method Detail

doBefore

int doBefore(ASTNode node,
           VariableResolverFactory factory)

This method is executed before the wrapped statement.

Parameters:

node - The ASTNode wrapped by the interceptor

factory - The variable factory

Returns:

The response code. Should return 0.

doAfter

int doAfter(Object exitStackValue,
          ASTNode node,
          VariableResolverFactory factory)

This method is called after the wrapped statement has completed. A copy of the top-value of the execution stack is also availablehere.

Parameters:

exitStackValue - The value on the top of the stack after executing the statement.

node - The ASTNode wrapped by the interceptor

factory - The variable factory

Returns:

The response code. Should return 0.