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/*
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.auto.factory.processor;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.collect.ImmutableSet;
import java.util.HashSet;
import java.util.Set;
import javax.lang.model.element.Element;
import javax.lang.model.type.ArrayType;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.IntersectionType;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.type.TypeVariable;
import javax.lang.model.type.UnionType;
import javax.lang.model.type.WildcardType;
import javax.lang.model.util.SimpleTypeVisitor8;
final class TypeVariables {
private TypeVariables() {}
static ImmutableSet<TypeVariable> getReferencedTypeVariables(TypeMirror type) {
checkNotNull(type);
return type.accept(ReferencedTypeVariables.INSTANCE, new HashSet<>());
}
private static final class ReferencedTypeVariables
extends SimpleTypeVisitor8<ImmutableSet<TypeVariable>, Set<Element>> {
private static final ReferencedTypeVariables INSTANCE = new ReferencedTypeVariables();
ReferencedTypeVariables() {
super(ImmutableSet.of());
}
@Override
public ImmutableSet<TypeVariable> visitArray(ArrayType t, Set<Element> visited) {
return t.getComponentType().accept(this, visited);
}
@Override
public ImmutableSet<TypeVariable> visitDeclared(DeclaredType t, Set<Element> visited) {
if (!visited.add(t.asElement())) {
return ImmutableSet.of();
}
ImmutableSet.Builder<TypeVariable> typeVariables = ImmutableSet.builder();
for (TypeMirror typeArgument : t.getTypeArguments()) {
typeVariables.addAll(typeArgument.accept(this, visited));
}
return typeVariables.build();
}
@Override
public ImmutableSet<TypeVariable> visitTypeVariable(TypeVariable t, Set<Element> visited) {
if (!visited.add(t.asElement())) {
return ImmutableSet.of();
}
ImmutableSet.Builder<TypeVariable> typeVariables = ImmutableSet.builder();
typeVariables.add(t);
typeVariables.addAll(t.getLowerBound().accept(this, visited));
typeVariables.addAll(t.getUpperBound().accept(this, visited));
return typeVariables.build();
}
@Override
public ImmutableSet<TypeVariable> visitUnion(UnionType t, Set<Element> visited) {
ImmutableSet.Builder<TypeVariable> typeVariables = ImmutableSet.builder();
for (TypeMirror unionType : t.getAlternatives()) {
typeVariables.addAll(unionType.accept(this, visited));
}
return typeVariables.build();
}
@Override
public ImmutableSet<TypeVariable> visitIntersection(IntersectionType t, Set<Element> visited) {
ImmutableSet.Builder<TypeVariable> typeVariables = ImmutableSet.builder();
for (TypeMirror intersectionType : t.getBounds()) {
typeVariables.addAll(intersectionType.accept(this, visited));
}
return typeVariables.build();
}
@Override
public ImmutableSet<TypeVariable> visitWildcard(WildcardType t, Set<Element> visited) {
ImmutableSet.Builder<TypeVariable> typeVariables = ImmutableSet.builder();
TypeMirror extendsBound = t.getExtendsBound();
if (extendsBound != null) {
typeVariables.addAll(extendsBound.accept(this, visited));
}
TypeMirror superBound = t.getSuperBound();
if (superBound != null) {
typeVariables.addAll(superBound.accept(this, visited));
}
return typeVariables.build();
}
}
}
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