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/*
* Copyright (C) 2017 The Dagger Authors.
*
* 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 dagger.internal.codegen.binding;
import static com.google.common.collect.Iterables.getOnlyElement;
import com.google.auto.common.MoreTypes;
import com.google.common.collect.ImmutableList;
import dagger.internal.codegen.base.ContributionType;
import dagger.internal.codegen.langmodel.DaggerElements;
import dagger.internal.codegen.langmodel.DaggerTypes;
import java.util.Map;
import java.util.Set;
import javax.inject.Inject;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.TypeMirror;
/**
* Checks the assignability of one type to another, given a {@link ContributionType} context. This
* is used by {@link dagger.internal.codegen.validation.BindsMethodValidator} to validate that the
* right-hand- side of a {@link dagger.Binds} method is valid, as well as in {@link
* dagger.internal.codegen.writing.DelegateBindingExpression} when the right-hand-side in generated
* code might be an erased type due to accessibility.
*/
public final class BindsTypeChecker {
private final DaggerTypes types;
private final DaggerElements elements;
// TODO(bcorso): Make this pkg-private. Used by DelegateBindingExpression.
@Inject
public BindsTypeChecker(DaggerTypes types, DaggerElements elements) {
this.types = types;
this.elements = elements;
}
/**
* Checks the assignability of {@code rightHandSide} to {@code leftHandSide} given a {@link
* ContributionType} context.
*/
public boolean isAssignable(
TypeMirror rightHandSide, TypeMirror leftHandSide, ContributionType contributionType) {
return types.isAssignable(rightHandSide, desiredAssignableType(leftHandSide, contributionType));
}
private TypeMirror desiredAssignableType(
TypeMirror leftHandSide, ContributionType contributionType) {
switch (contributionType) {
case UNIQUE:
return leftHandSide;
case SET:
DeclaredType parameterizedSetType = types.getDeclaredType(setElement(), leftHandSide);
return methodParameterType(parameterizedSetType, "add");
case SET_VALUES:
return methodParameterType(MoreTypes.asDeclared(leftHandSide), "addAll");
case MAP:
DeclaredType parameterizedMapType =
types.getDeclaredType(mapElement(), unboundedWildcard(), leftHandSide);
return methodParameterTypes(parameterizedMapType, "put").get(1);
}
throw new AssertionError("Unknown contribution type: " + contributionType);
}
private ImmutableList<TypeMirror> methodParameterTypes(DeclaredType type, String methodName) {
ImmutableList.Builder<ExecutableElement> methodsForName = ImmutableList.builder();
for (ExecutableElement method :
// type.asElement().getEnclosedElements() is not used because some non-standard JDKs (e.g.
// J2CL) don't redefine Set.add() (whose only purpose of being redefined in the standard JDK
// is documentation, and J2CL's implementation doesn't declare docs for JDK types).
// getLocalAndInheritedMethods ensures that the method will always be present.
elements.getLocalAndInheritedMethods(MoreTypes.asTypeElement(type))) {
if (method.getSimpleName().contentEquals(methodName)) {
methodsForName.add(method);
}
}
ExecutableElement method = getOnlyElement(methodsForName.build());
return ImmutableList.copyOf(
MoreTypes.asExecutable(types.asMemberOf(type, method)).getParameterTypes());
}
private TypeMirror methodParameterType(DeclaredType type, String methodName) {
return getOnlyElement(methodParameterTypes(type, methodName));
}
private TypeElement setElement() {
return elements.getTypeElement(Set.class);
}
private TypeElement mapElement() {
return elements.getTypeElement(Map.class);
}
private TypeMirror unboundedWildcard() {
return types.getWildcardType(null, null);
}
}
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