/*
* Copyright 2016-present Facebook, Inc.
*
* 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.facebook.buck.jvm.java.abi.source;
import com.facebook.buck.util.liteinfersupport.Nullable;
import java.util.Collections;
import java.util.List;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeParameterElement;
import javax.lang.model.type.NullType;
import javax.lang.model.type.TypeKind;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.type.TypeVariable;
import javax.lang.model.util.Types;
/**
* An implementation of {@link TypeVariable} that is not dependent on any particular compiler
* implementation. It requires {@link javax.lang.model.element.Element} and {@link TypeMirror}
* objects, but does not depend on any particular implementation of them (beyond the spec).
*/
class StandaloneTypeVariable extends StandaloneTypeMirror implements TypeVariable {
private final TypeParameterElement element;
private final NullType lowerBound;
@Nullable private TypeMirror upperBound;
public StandaloneTypeVariable(Types types, TypeParameterElement element) {
this(types, element, Collections.emptyList());
}
public StandaloneTypeVariable(
Types types, TypeParameterElement element, List<? extends AnnotationMirror> annotations) {
super(TypeKind.TYPEVAR, annotations);
this.element = element;
lowerBound = types.getNullType();
}
@Override
public Element asElement() {
return element;
}
@Override
public TypeMirror getUpperBound() {
if (upperBound == null) {
final List<? extends TypeMirror> bounds = element.getBounds();
if (bounds.size() == 1) {
upperBound = bounds.get(0);
} else {
upperBound = new StandaloneIntersectionType(bounds);
}
}
return upperBound;
}
@Override
public TypeMirror getLowerBound() {
// TODO(jkeljo): Capture conversion can create a non-null lower bound, but we don't need it yet.
return lowerBound;
}
@Override
public String toString() {
return element.toString();
}
}