/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* 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;
import static com.google.errorprone.BugPattern.Category.JDK;
import static com.google.errorprone.BugPattern.SeverityLevel.WARNING;
import static com.google.errorprone.matchers.method.MethodMatchers.instanceMethod;
import com.google.errorprone.BugPattern;
import com.google.errorprone.VisitorState;
import com.google.errorprone.fixes.SuggestedFix;
import com.google.errorprone.matchers.Description;
import com.google.errorprone.matchers.Matcher;
import com.google.errorprone.util.ASTHelpers;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.tree.MethodInvocationTree;
/** @author cushon@google.com (Liam Miller-Cushon) */
@BugPattern(
name = "GetClassOnEnum",
category = JDK,
summary = "Calling getClass() on an enum may return a subclass of the enum type",
severity = WARNING
)
public class GetClassOnEnum extends BugChecker implements BugChecker.MethodInvocationTreeMatcher {
private static final Matcher<ExpressionTree> ENUM_CLASS =
instanceMethod().onDescendantOf(Enum.class.getName()).named("getClass").withParameters();
@Override
public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
if (ENUM_CLASS.matches(tree, state)) {
return describeMatch(
tree,
SuggestedFix.replace(
state.getEndPosition(ASTHelpers.getReceiver(tree)),
state.getEndPosition(tree),
".getDeclaringClass()"));
}
return Description.NO_MATCH;
}
}