| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * 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.android.tools.lint.checks; |
| |
| import static com.android.SdkConstants.CLASS_VIEW; |
| import static com.android.SdkConstants.SUPPORT_ANNOTATIONS_PREFIX; |
| import static com.android.tools.lint.checks.SupportAnnotationDetector.filterRelevantAnnotations; |
| import static com.android.tools.lint.detector.api.LintUtils.skipParentheses; |
| |
| import com.android.annotations.NonNull; |
| import com.android.annotations.Nullable; |
| import com.android.tools.lint.client.api.JavaEvaluator; |
| import com.android.tools.lint.detector.api.Category; |
| import com.android.tools.lint.detector.api.Detector; |
| import com.android.tools.lint.detector.api.Detector.JavaPsiScanner; |
| import com.android.tools.lint.detector.api.Implementation; |
| import com.android.tools.lint.detector.api.Issue; |
| import com.android.tools.lint.detector.api.JavaContext; |
| import com.android.tools.lint.detector.api.Location; |
| import com.android.tools.lint.detector.api.Scope; |
| import com.android.tools.lint.detector.api.Severity; |
| import com.intellij.psi.JavaElementVisitor; |
| import com.intellij.psi.JavaRecursiveElementVisitor; |
| import com.intellij.psi.PsiAnnotation; |
| import com.intellij.psi.PsiElement; |
| import com.intellij.psi.PsiMethod; |
| import com.intellij.psi.PsiReferenceExpression; |
| import com.intellij.psi.PsiSuperExpression; |
| |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| * Makes sure that methods call super when overriding methods. |
| */ |
| public class CallSuperDetector extends Detector implements JavaPsiScanner { |
| private static final String CALL_SUPER_ANNOTATION = SUPPORT_ANNOTATIONS_PREFIX + "CallSuper"; //$NON-NLS-1$ |
| private static final String ON_DETACHED_FROM_WINDOW = "onDetachedFromWindow"; //$NON-NLS-1$ |
| private static final String ON_VISIBILITY_CHANGED = "onVisibilityChanged"; //$NON-NLS-1$ |
| |
| private static final Implementation IMPLEMENTATION = new Implementation( |
| CallSuperDetector.class, |
| Scope.JAVA_FILE_SCOPE); |
| |
| /** Missing call to super */ |
| public static final Issue ISSUE = Issue.create( |
| "MissingSuperCall", //$NON-NLS-1$ |
| "Missing Super Call", |
| |
| "Some methods, such as `View#onDetachedFromWindow`, require that you also " + |
| "call the super implementation as part of your method.", |
| |
| Category.CORRECTNESS, |
| 9, |
| Severity.ERROR, |
| IMPLEMENTATION); |
| |
| /** Constructs a new {@link CallSuperDetector} check */ |
| public CallSuperDetector() { |
| } |
| |
| // ---- Implements JavaScanner ---- |
| |
| |
| @Override |
| public List<Class<? extends PsiElement>> getApplicablePsiTypes() { |
| return Collections.<Class<? extends PsiElement>>singletonList(PsiMethod.class); |
| } |
| |
| @Override |
| public JavaElementVisitor createPsiVisitor(@NonNull final JavaContext context) { |
| return new JavaElementVisitor() { |
| @Override |
| public void visitMethod(PsiMethod method) { |
| checkCallSuper(context, method); |
| } |
| }; |
| } |
| |
| private static void checkCallSuper(@NonNull JavaContext context, |
| @NonNull PsiMethod method) { |
| |
| PsiMethod superMethod = getRequiredSuperMethod(context, method); |
| if (superMethod != null) { |
| if (!SuperCallVisitor.callsSuper(method, superMethod)) { |
| String methodName = method.getName(); |
| String message = "Overriding method should call `super." |
| + methodName + "`"; |
| Location location = context.getNameLocation(method); |
| context.report(ISSUE, method, location, message); |
| } |
| } |
| } |
| |
| /** |
| * Checks whether the given method overrides a method which requires the super method |
| * to be invoked, and if so, returns it (otherwise returns null) |
| */ |
| @Nullable |
| private static PsiMethod getRequiredSuperMethod(@NonNull JavaContext context, |
| @NonNull PsiMethod method) { |
| |
| JavaEvaluator evaluator = context.getEvaluator(); |
| PsiMethod directSuper = evaluator.getSuperMethod(method); |
| if (directSuper == null) { |
| return null; |
| } |
| |
| String name = method.getName(); |
| if (ON_DETACHED_FROM_WINDOW.equals(name)) { |
| // No longer annotated on the framework method since it's |
| // now handled via onDetachedFromWindowInternal, but overriding |
| // is still dangerous if supporting older versions so flag |
| // this for now (should make annotation carry metadata like |
| // compileSdkVersion >= N). |
| if (!evaluator.isMemberInSubClassOf(method, CLASS_VIEW, false)) { |
| return null; |
| } |
| return directSuper; |
| } else if (ON_VISIBILITY_CHANGED.equals(name)) { |
| // From Android Wear API; doesn't yet have an annotation |
| // but we want to enforce this right away until the AAR |
| // is updated to supply it once @CallSuper is available in |
| // the support library |
| if (!evaluator.isMemberInSubClassOf(method, |
| "android.support.wearable.watchface.WatchFaceService.Engine", false)) { |
| return null; |
| } |
| return directSuper; |
| } |
| |
| // Look up annotations metadata |
| PsiMethod superMethod = directSuper; |
| while (superMethod != null) { |
| PsiAnnotation[] annotations = superMethod.getModifierList().getAnnotations(); |
| annotations = filterRelevantAnnotations(annotations); |
| for (PsiAnnotation annotation : annotations) { |
| String signature = annotation.getQualifiedName(); |
| if (CALL_SUPER_ANNOTATION.equals(signature)) { |
| return directSuper; |
| } else if (signature != null && signature.endsWith(".OverrideMustInvoke")) { |
| // Handle findbugs annotation on the fly too |
| return directSuper; |
| } |
| } |
| superMethod = evaluator.getSuperMethod(superMethod); |
| } |
| |
| return null; |
| } |
| |
| /** Visits a method and determines whether the method calls its super method */ |
| private static class SuperCallVisitor extends JavaRecursiveElementVisitor { |
| private final PsiMethod mMethod; |
| private boolean mCallsSuper; |
| |
| public static boolean callsSuper(@NonNull PsiMethod method, |
| @NonNull PsiMethod superMethod) { |
| SuperCallVisitor visitor = new SuperCallVisitor(superMethod); |
| method.accept(visitor); |
| return visitor.mCallsSuper; |
| } |
| |
| private SuperCallVisitor(@NonNull PsiMethod method) { |
| mMethod = method; |
| } |
| |
| @Override |
| public void visitSuperExpression(PsiSuperExpression node) { |
| super.visitSuperExpression(node); |
| |
| PsiElement parent = skipParentheses(node.getParent()); |
| if (parent instanceof PsiReferenceExpression) { |
| PsiElement resolved = ((PsiReferenceExpression) parent).resolve(); |
| if (mMethod.equals(resolved)) { |
| mCallsSuper = true; |
| } |
| } |
| } |
| } |
| } |