Examples with BugPattern com.google.errorprone.BugPattern used on opensource projects

Example 1 with BugPattern

use of com.google.errorprone.BugPattern in project error-prone by google.

the class MissingDefault method matchSwitch.

@Override
public Description matchSwitch(SwitchTree tree, VisitorState state) {
    Type switchType = ASTHelpers.getType(tree.getExpression());
    if (switchType.asElement().getKind() == ElementKind.ENUM) {
        // by MissingCasesInEnumSwitch
        return NO_MATCH;
    }
    Optional<? extends CaseTree> maybeDefault = tree.getCases().stream().filter(c -> c.getExpression() == null).findFirst();
    if (!maybeDefault.isPresent()) {
        Description.Builder description = buildDescription(tree);
        if (!tree.getCases().isEmpty()) {
            // Inserting the default after the last case is easier than finding the closing brace
            // for the switch statement. Hopefully we don't often see switches with zero cases.
            CaseTree lastCase = getLast(tree.getCases());
            String replacement;
            if (lastCase.getStatements().isEmpty() || Reachability.canCompleteNormally(Iterables.getLast(lastCase.getStatements()))) {
                replacement = "\nbreak;\ndefault: // fall out\n";
            } else {
                replacement = "\ndefault: // fall out\n";
            }
            description.addFix(SuggestedFix.postfixWith(getLast(tree.getCases()), replacement));
        }
        return description.build();
    }
    CaseTree defaultCase = maybeDefault.get();
    if (!defaultCase.getStatements().isEmpty()) {
        return NO_MATCH;
    }
    // If `default` case is empty, and last in switch, add `// fall out` comment
    // TODO(epmjohnston): Maybe move comment logic to go/bugpattern/FallThrough
    int idx = tree.getCases().indexOf(defaultCase);
    if (idx != tree.getCases().size() - 1) {
        return NO_MATCH;
    }
    int end = state.getEndPosition(tree);
    if (ErrorProneTokens.getTokens(state.getSourceCode().subSequence(state.getEndPosition(defaultCase), end).toString(), state.context).stream().anyMatch(t -> !t.comments().isEmpty())) {
        return NO_MATCH;
    }
    return buildDescription(defaultCase).setMessage("Default case should be documented with a comment").addFix(SuggestedFix.postfixWith(defaultCase, " // fall out")).build();
}