/*
* Copyright 2014 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.matchers.ChildMultiMatcher.MatchType.AT_LEAST_ONE;
import static com.google.errorprone.matchers.Matchers.allOf;
import static com.google.errorprone.matchers.Matchers.argument;
import static com.google.errorprone.matchers.Matchers.classLiteral;
import static com.google.errorprone.matchers.Matchers.enclosingClass;
import static com.google.errorprone.matchers.Matchers.hasAnnotation;
import static com.google.errorprone.matchers.Matchers.hasArgumentWithValue;
import static com.google.errorprone.matchers.Matchers.hasModifier;
import static com.google.errorprone.matchers.Matchers.isSameType;
import static com.google.errorprone.matchers.Matchers.isType;
import static com.google.errorprone.matchers.Matchers.staticMethod;
import static com.google.errorprone.matchers.Matchers.variableType;
import com.google.errorprone.BugPattern;
import com.google.errorprone.BugPattern.Category;
import com.google.errorprone.BugPattern.SeverityLevel;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher;
import com.google.errorprone.bugpatterns.BugChecker.VariableTreeMatcher;
import com.google.errorprone.matchers.Description;
import com.google.errorprone.matchers.Matcher;
import com.google.errorprone.matchers.Matchers;
import com.sun.source.tree.AnnotationTree;
import com.sun.source.tree.ClassTree;
import com.sun.source.tree.MethodInvocationTree;
import com.sun.source.tree.Tree;
import com.sun.source.tree.VariableTree;
import javax.lang.model.element.Modifier;
/**
* Bug pattern to recognize attempts to mock final types.
*
* @author Louis Wasserman
*/
@BugPattern(
name = "CannotMockFinalClass",
summary = "Mockito cannot mock final classes",
explanation =
"Mockito cannot mock final classes. See "
+ "https://github.com/mockito/mockito/wiki/FAQ for details.",
category = Category.MOCKITO,
severity = SeverityLevel.WARNING
)
public class CannotMockFinalClass extends BugChecker
implements MethodInvocationTreeMatcher, VariableTreeMatcher {
// TODO(lowasser): consider stopping mocks of primitive types here or in its own checker
// Runners like GwtMockito allow mocking final types, so we conservatively stick to JUnit4.
private static final Matcher<AnnotationTree> runWithJunit4 = allOf(
isType("org.junit.runner.RunWith"),
hasArgumentWithValue("value", classLiteral(isSameType("org.junit.runners.JUnit4"))));
private static final Matcher<Tree> enclosingClassIsJunit4Test =
enclosingClass(Matchers.<ClassTree>annotations(AT_LEAST_ONE, runWithJunit4));
private static final Matcher<VariableTree> variableOfFinalClassAnnotatedMock = allOf(
variableType(hasModifier(Modifier.FINAL)),
hasAnnotation("org.mockito.Mock"),
enclosingClassIsJunit4Test);
private static final Matcher<MethodInvocationTree> creationOfMockForFinalClass = allOf(
staticMethod().onClass("org.mockito.Mockito").named("mock"),
argument(0, classLiteral(hasModifier(Modifier.FINAL))),
enclosingClassIsJunit4Test);
@Override
public Description matchVariable(VariableTree tree, VisitorState state) {
return variableOfFinalClassAnnotatedMock.matches(tree, state)
? describeMatch(tree)
: Description.NO_MATCH;
}
@Override
public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
return creationOfMockForFinalClass.matches(tree, state)
? describeMatch(tree)
: Description.NO_MATCH;
}
}