private static boolean processCatchStatement()

in src/org/jetbrains/java/decompiler/modules/decompiler/PatternHelper.java [349:415]
65 lines of code
29 McCabe index (conditional complexity)

  private static boolean processCatchStatement(@NotNull VarTracker tracker,
                                               @NotNull CatchStatement statement) {
    Statement tryBody = statement.getFirst();
    if (tryBody == null || tryBody.getStats() == null || !tryBody.getStats().isEmpty() ||
        tryBody.getExprents() == null || tryBody.getExprents().size() != 1) {
      return false;
    }
    Exprent body = tryBody.getExprents().get(0);
    InvocationExprent invocationExprent = null;
    boolean hasAssignment = false;
    if (body instanceof AssignmentExprent assignmentExprent && assignmentExprent.getRight() instanceof InvocationExprent newInvocation) {
      invocationExprent = newInvocation;
      hasAssignment = true;
    }
    else if (body instanceof InvocationExprent newInvocation) {
      invocationExprent = newInvocation;
    }
    if (invocationExprent == null) {
      return false;
    }
    Exprent qualifier = invocationExprent.getInstance();
    if (qualifier == null ||
        invocationExprent.isStatic() ||
        !(invocationExprent.getParameters() != null && invocationExprent.getParameters().isEmpty())) {
      return false;
    }
    RecordVarExprent recordVarExprent = tracker.getRecord(qualifier);
    if (recordVarExprent == null) {
      return false;
    }
    if (statement.getStats().size() != 2) {
      return false;
    }
    Statement catchSection = statement.getStats().get(1);
    if (!(catchSection.getStats().isEmpty() && catchSection.getExprents() != null)) {
      return false;
    }
    if (!((catchSection.getExprents().size() == 1) ||
          (catchSection.getExprents().size() == 2 && catchSection.getExprents().get(1) instanceof ExitExprent))) {
      return false;
    }
    Exprent throwExpected = catchSection.getExprents().get(0);
    if (!((throwExpected instanceof ExitExprent exitExprent && exitExprent.getExitType() == EXIT_THROW &&
          exitExprent.getValue() instanceof NewExprent newExprent && newExprent.getNewType() != null &&
          MATCH_EXCEPTION.equals(newExprent.getNewType().getValue())) ||
        (catchSection.getExprents().get(1) instanceof ExitExprent))) {
      return false;
    }

    if (!hasAssignment) {
      VarType exprType = invocationExprent.getExprType();
      VarProcessor processor = DecompilerContext.getVarProcessor();
      RecordVarExprent nextComponent = new RecordVarExprent(new VarExprent(DecompilerContext.getCounterContainer().getCounterAndIncrement(CounterContainer.VAR_COUNTER), exprType,processor ));
      recordVarExprent.addComponent(nextComponent);
      return true;
    }
    if (!(((AssignmentExprent)body).getLeft() instanceof VarExprent assignTo)) {
      return false;
    }
    VarExprent assignToDefinition = (VarExprent)assignTo.copy();
    assignToDefinition.setDefinition(true);
    RecordVarExprent nextComponent = new RecordVarExprent(assignToDefinition);
    recordVarExprent.addComponent(nextComponent);
    tracker.put(assignTo, nextComponent, tryBody);

    return true;
  }