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/*
* Copyright 2018 The Error Prone 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 com.google.errorprone.bugpatterns.apidiff;
import static com.google.errorprone.util.ASTHelpers.getSymbol;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.BugChecker;
import com.google.errorprone.bugpatterns.BugChecker.IdentifierTreeMatcher;
import com.google.errorprone.bugpatterns.BugChecker.MemberSelectTreeMatcher;
import com.google.errorprone.bugpatterns.apidiff.ApiDiff.ClassMemberKey;
import com.google.errorprone.matchers.Description;
import com.google.errorprone.util.ASTHelpers;
import com.google.errorprone.util.Signatures;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.tree.IdentifierTree;
import com.sun.source.tree.ImportTree;
import com.sun.source.tree.MemberSelectTree;
import com.sun.tools.javac.code.Symbol;
import com.sun.tools.javac.code.Symbol.ClassSymbol;
import com.sun.tools.javac.code.Symbol.MethodSymbol;
import com.sun.tools.javac.code.Symbol.VarSymbol;
import com.sun.tools.javac.code.Type;
import com.sun.tools.javac.code.Types;
import java.lang.annotation.Annotation;
import java.util.Optional;
/** A base Error Prone check implementation to enforce compliance with a given API diff. */
public abstract class ApiDiffChecker extends BugChecker
implements IdentifierTreeMatcher, MemberSelectTreeMatcher {
private final ApiDiff apiDiff;
private final Optional> alsoForbidApisAnnotated;
protected ApiDiffChecker(ApiDiff apiDiff) {
this.apiDiff = apiDiff;
this.alsoForbidApisAnnotated = Optional.empty();
}
protected ApiDiffChecker(ApiDiff apiDiff, Class alsoForbidApisAnnotated) {
this.apiDiff = apiDiff;
this.alsoForbidApisAnnotated = Optional.of(alsoForbidApisAnnotated);
}
@Override
public Description matchIdentifier(IdentifierTree tree, VisitorState state) {
return check(tree, state);
}
@Override
public Description matchMemberSelect(MemberSelectTree tree, VisitorState state) {
return check(tree, state);
}
protected Description check(ExpressionTree tree, VisitorState state) {
if (state.findEnclosing(ImportTree.class) != null) {
return Description.NO_MATCH;
}
Symbol sym = getSymbol(tree);
if (sym == null) {
return Description.NO_MATCH;
}
ClassSymbol receiver = getReceiver(tree, sym);
if (receiver == null) {
// e.g. package symbols
return Description.NO_MATCH;
}
Types types = state.getTypes();
// check for information associated with the class
if (apiDiff.isClassUnsupported(Signatures.classDescriptor(receiver.type, types))
|| classOrEnclosingClassIsForbiddenByAnnotation(receiver, state)) {
return buildDescription(tree)
.setMessage(String.format("%s is not available", receiver))
.build();
}
// check for fields and methods that are not present in the old API
if (!(sym instanceof VarSymbol || sym instanceof MethodSymbol)) {
return Description.NO_MATCH;
}
ClassMemberKey memberKey =
ClassMemberKey.create(
sym.getSimpleName().toString(), Signatures.descriptor(sym.type, types));
ClassSymbol owner = sym.owner.enclClass();
if (apiDiff.isMemberUnsupported(Signatures.classDescriptor(owner.type, types), memberKey)
|| hasAnnotationForbiddingUse(sym, state)) {
return buildDescription(tree)
.setMessage(String.format("%s#%s is not available in %s", owner, sym, receiver))
.build();
}
return Description.NO_MATCH;
}
private boolean classOrEnclosingClassIsForbiddenByAnnotation(Symbol clazz, VisitorState state) {
if (!alsoForbidApisAnnotated.isPresent()) {
return false;
}
for (; clazz instanceof ClassSymbol; clazz = clazz.owner) {
if (hasAnnotationForbiddingUse(clazz, state)) {
return true;
}
}
return false;
}
private boolean hasAnnotationForbiddingUse(Symbol sym, VisitorState state) {
return alsoForbidApisAnnotated.isPresent()
&& ASTHelpers.hasAnnotation(sym, alsoForbidApisAnnotated.get(), state);
}
/**
* Finds the class of the expression's receiver: the declaring class of a static member access, or
* the type that an instance member is accessed on.
*/
private static ClassSymbol getReceiver(ExpressionTree tree, Symbol sym) {
if (sym.isStatic() || sym instanceof ClassSymbol) {
return sym.enclClass();
}
switch (tree.getKind()) {
case MEMBER_SELECT:
case METHOD_INVOCATION:
Type receiver = ASTHelpers.getType(ASTHelpers.getReceiver(tree));
if (receiver == null) {
return null;
}
return receiver.tsym.enclClass();
case IDENTIFIER:
// Simple names are implicitly qualified by an enclosing instance, so if we get here
// we're inside the compilation unit that declares the receiver, and the diff doesn't
// contain accurate information.
return null;
default:
return null;
}
}
}