A try-cA try/catch/finally statement, that is, a try’ clause (tryClause), followed by any amount of catch’ clauses (catchClauses), and optionally terminated by a finally’ clause (finallyClause).

Examples (multi-line):

// removing a non-critical entity, e. g. when running low on resources
try (writer = file.Writer()) {
    that.serialize(writer);
} finally {
    despawn(that);
}

// a compilation controller
try (lock) {
    compilationUnit.compile(this);
} catch (CancellationException e) {
    // ignore
} catch (otherException) {
    log(otherException);
    compilationUnit.compiled = false;
}

no subtypes hierarchy

Initializer
TryCatchFinally(TryClause tryClause, CatchClause[] catchClauses = [], FinallyClause? finallyClause = null)
Parameters:
  • tryClause

    The ‘try’ clause.

  • catchClauses = []

    The ‘catch’ clauses, if any.

    If an exception propagated out of the try block (TryClause.block), the first catch block (CatchClause.block) with a matching variable is executed.

  • finallyClause = null

    The ‘finally’ clause, if present.

    The finally block (FinallyClause.block) is executed last, even if an exception propagates out of the entire construct.

Attributes
catchClausesSource Codeshared CatchClause[] catchClauses

The ‘catch’ clauses, if any.

If an exception propagated out of the try block (TryClause.block), the first catch block (CatchClause.block) with a matching variable is executed.

childrenSource Codeshared actual [TryClause, <CatchClause|FinallyClause>*] children

The child nodes of this node.

finallyClauseSource Codeshared FinallyClause? finallyClause

The ‘finally’ clause, if present.

The finally block (FinallyClause.block) is executed last, even if an exception propagates out of the entire construct.

hashSource Codeshared actual Integer hash

The hash value of the value, which allows the value to be an element of a hash-based set or key of a hash-based map. Implementations must respect the constraint that:

  • if x==y then x.hash==y.hash.

Therefore, a class which refines equals must also refine hash.

Refines Object.hash
tryClauseSource Codeshared TryClause tryClause

The ‘try’ clause.

Inherited Attributes
Attributes inherited from: Node
Attributes inherited from: Object
Methods
copySource Codeshared TryCatchFinally copy(TryClause tryClause = ..., CatchClause[] catchClauses = ..., FinallyClause? finallyClause = ...)
Parameters:
  • tryClause = this.tryClause
  • catchClauses = this.catchClauses
  • finallyClause = this.finallyClause
equalsSource Codeshared actual Boolean equals(Object that)

Determine if two values are equal. Implementations should respect the constraints that:

  • if x===y then x==y (reflexivity),
  • if x==y then y==x (symmetry),
  • if x==y and y==z then x==z (transitivity).

Furthermore it is recommended that implementations ensure that if x==y then x and y have the same concrete class.

A class which explicitly refines equals() is said to support value equality, and the equality operator == is considered much more meaningful for such classes than for a class which simply inherits the default implementation of identity equality from Identifiable.

transformSource Codeshared actual Result transform<out Result>(Transformer<Result> transformer)

Transform this node with the given transformer by calling the appropriate transformX method on the transformer.

If you have a Node node that’s actually an LIdentifier instance, then the runtime will call LIdentifier.transform; therefore, this method is by nature narrowing. This means that if transformer is a NarrowingTransformer, calling node.transform(transformer) is equivalent to calling transformer.transformNode(node). On the other hand, if transformer is a WideningTransformer, then the two operations are very different.

Inherited Methods
Methods inherited from: Node