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package org.robolectric.errorprone.bugpatterns;
import static com.google.errorprone.util.ASTHelpers.findEnclosingNode;
import static com.google.errorprone.util.ASTHelpers.hasAnnotation;
import com.google.errorprone.VisitorState;
import com.google.errorprone.predicates.TypePredicate;
import com.google.errorprone.suppliers.Supplier;
import com.google.errorprone.suppliers.Suppliers;
import com.google.errorprone.util.ASTHelpers;
import com.sun.source.tree.Tree;
import com.sun.source.util.TreePath;
import com.sun.tools.javac.code.Type;
import com.sun.tools.javac.tree.JCTree.JCClassDecl;
import org.robolectric.annotation.Implements;
/** Matchers for {@link ShadowUsageCheck}. */
public class Helpers {
/** Match sub-types or implementations of the given type. */
public static TypePredicate isCastableTo(Supplier<Type> type) {
return new CastableTo(type);
}
/** Match sub-types or implementations of the given type. */
public static TypePredicate isCastableTo(String type) {
return new CastableTo(Suppliers.typeFromString(type));
}
public static boolean isInShadowClass(TreePath path, VisitorState state) {
Tree leaf = path.getLeaf();
JCClassDecl classDecl = JCClassDecl.class.isInstance(leaf)
? (JCClassDecl) leaf
: findEnclosingNode(state.getPath(), JCClassDecl.class);
return hasAnnotation(classDecl, Implements.class, state);
}
/** Matches implementations of the given interface. */
public static class CastableTo implements TypePredicate {
public final Supplier<Type> expected;
public CastableTo(Supplier<Type> type) {
this.expected = type;
}
@Override
public boolean apply(Type type, VisitorState state) {
Type bound = expected.get(state);
if (bound == null || type == null) {
// TODO(cushon): type suppliers are allowed to return null :(
return false;
}
return ASTHelpers.isCastable(type, bound, state);
}
}
}
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