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...one-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/util/MoreTypePredicates.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| package tech.picnic.errorprone.bugpatterns.util; | ||
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| import com.google.errorprone.VisitorState; | ||
| import com.google.errorprone.predicates.TypePredicate; | ||
| import com.google.errorprone.predicates.TypePredicates; | ||
| import com.google.errorprone.suppliers.Supplier; | ||
| import com.google.errorprone.util.ASTHelpers; | ||
| import com.sun.tools.javac.code.Type; | ||
| import com.sun.tools.javac.util.List; | ||
|
|
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| /** | ||
| * A collection of general-purpose {@link TypePredicate}s. | ||
| * | ||
| * <p>These methods are additions to the ones found in {@link TypePredicates}. | ||
| */ | ||
| // XXX: The methods in this class are tested only indirectly. Consider adding a dedicated test | ||
| // class, or make sure that each method is explicitly covered by a tested analog in `MoreMatchers`. | ||
| public final class MoreTypePredicates { | ||
| private MoreTypePredicates() {} | ||
|
|
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| /** | ||
| * Returns a {@link TypePredicate} that matches types that are annotated with the indicated | ||
| * annotation type. | ||
| * | ||
| * @param annotationType The fully-qualified name of the annotation type. | ||
| * @return A {@link TypePredicate} that matches appropriate types. | ||
| */ | ||
| public static TypePredicate hasAnnotation(String annotationType) { | ||
| return (type, state) -> ASTHelpers.hasAnnotation(type.tsym, annotationType, state); | ||
| } | ||
|
|
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| /** | ||
| * Returns a {@link TypePredicate} that matches subtypes of the type returned by the specified | ||
| * {@link Supplier}. | ||
| * | ||
| * @implNote This method does not use {@link ASTHelpers#isSubtype(Type, Type, VisitorState)}, as | ||
| * that method performs type erasure. | ||
| * @param bound The {@link Supplier} that returns the type to match against. | ||
| * @return A {@link TypePredicate} that matches appropriate subtypes. | ||
| */ | ||
| public static TypePredicate isSubTypeOf(Supplier<Type> bound) { | ||
| Supplier<Type> memoizedType = VisitorState.memoize(bound); | ||
| return (type, state) -> { | ||
| Type boundType = memoizedType.get(state); | ||
| return boundType != null && state.getTypes().isSubtype(type, boundType); | ||
| }; | ||
| } | ||
|
|
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| /** | ||
| * Returns a {@link TypePredicate} that matches generic types with a type parameter that matches | ||
| * the specified {@link TypePredicate} at the indicated index. | ||
| * | ||
| * @param index The index of the type parameter to match against. | ||
| * @param predicate The {@link TypePredicate} to match against the type parameter. | ||
| * @return A {@link TypePredicate} that matches appropriate generic types. | ||
| */ | ||
| public static TypePredicate hasTypeParameter(int index, TypePredicate predicate) { | ||
| return (type, state) -> { | ||
| List<Type> typeArguments = type.getTypeArguments(); | ||
| return typeArguments.size() > index && predicate.apply(typeArguments.get(index), state); | ||
| }; | ||
| } | ||
| } |
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