org.apache.tapestry5.plastic
Interface TryCatchBlock

All Known Implementing Classes:

TryCatchBlockImpl

public interface TryCatchBlock

Allows a portion of a method to be marked so that exception and finally handlers can be provided.

See Also:

InstructionBuilder.startTryCatch(TryCatchCallback)

Method Summary

void	addCatch(String exceptionClassName, InstructionBuilderCallback callback) Ends the block (if not already ended) and inserts a catch block for the named exception.
void	addFinally(InstructionBuilderCallback callback) As with addCatch(String, InstructionBuilderCallback), but the exception caught is null, which acts as a finally block in the Java language.
void	addTry(InstructionBuilderCallback callback) Invoked first, to generate the code in which exceptions may be caught.

Method Detail

addTry

void addTry(InstructionBuilderCallback callback)

Invoked first, to generate the code in which exceptions may be caught.

addCatch

@Opcodes(value="TRYCATCHBLOCK")
void addCatch(String exceptionClassName,
                           InstructionBuilderCallback callback)

Ends the block (if not already ended) and inserts a catch block for the named exception. The InstructionBuilder is returned so that the code for handling the exception can be added. The exception object will be on top of the stack. This should be called after addTry(InstructionBuilderCallback).

Note: no attempt is made currently to sort the handlers; for example adding a catch for java.lang.Exception first will mean that more specific exception handlers added later will never be invoked.

Parameters:

exceptionClassName - caught exception class

callback - that implements the logic of the catch block

addFinally

@Opcodes(value="TRYCATCHBLOCK")
void addFinally(InstructionBuilderCallback callback)

As with addCatch(String, InstructionBuilderCallback), but the exception caught is null, which acts as a finally block in the Java language. This must be called last (after addTry(InstructionBuilderCallback) and any calls to addCatch(String, InstructionBuilderCallback).

Parameters:

callback - implements the logic of the finally block