| /* |
| * 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.matchers; |
| |
| import com.google.errorprone.VisitorState; |
| import com.google.errorprone.util.ASTHelpers; |
| import com.sun.source.tree.ExpressionTree; |
| import com.sun.source.tree.ImportTree; |
| import com.sun.tools.javac.code.Symbol; |
| import com.sun.tools.javac.code.Symbol.ClassSymbol; |
| import javax.annotation.Nullable; |
| |
| // TODO(glorioso): this likely wants to be a fluent interface like MethodMatchers. |
| // Ex: [staticField()|instanceField()] |
| // .[onClass(String)|onAnyClass|onClassMatching] |
| // .[named(String)|withAnyName|withNameMatching] |
| /** Static utility methods for creating {@link Matcher}s for detecting references to fields. */ |
| public final class FieldMatchers { |
| private FieldMatchers() {} |
| |
| public static Matcher<ExpressionTree> anyFieldInClass(String className) { |
| return new FieldReferenceMatcher() { |
| @Override |
| boolean classIsAppropriate(ClassSymbol classSymbol) { |
| return classSymbol.getQualifiedName().contentEquals(className); |
| } |
| |
| @Override |
| boolean fieldSymbolIsAppropriate(Symbol symbol) { |
| return true; |
| } |
| }; |
| } |
| |
| public static Matcher<ExpressionTree> staticField(String className, String fieldName) { |
| return new FieldReferenceMatcher() { |
| @Override |
| boolean classIsAppropriate(ClassSymbol classSymbol) { |
| return classSymbol.getQualifiedName().contentEquals(className); |
| } |
| |
| @Override |
| boolean fieldSymbolIsAppropriate(Symbol symbol) { |
| return symbol.isStatic() && symbol.getSimpleName().contentEquals(fieldName); |
| } |
| }; |
| } |
| |
| public static Matcher<ExpressionTree> instanceField(String className, String fieldName) { |
| return new FieldReferenceMatcher() { |
| @Override |
| boolean classIsAppropriate(ClassSymbol classSymbol) { |
| return classSymbol.getQualifiedName().contentEquals(className); |
| } |
| |
| @Override |
| boolean fieldSymbolIsAppropriate(Symbol symbol) { |
| return !symbol.isStatic() && symbol.getSimpleName().contentEquals(fieldName); |
| } |
| }; |
| } |
| |
| private abstract static class FieldReferenceMatcher implements Matcher<ExpressionTree> { |
| @Override |
| public boolean matches(ExpressionTree expressionTree, VisitorState state) { |
| return isSymbolFieldInAppropriateClass(ASTHelpers.getSymbol(expressionTree)) |
| // Don't match if this is part of a static import tree, since they will get the finding |
| // on any usage of the field in their source. |
| && ASTHelpers.findEnclosingNode(state.getPath(), ImportTree.class) == null; |
| } |
| |
| private boolean isSymbolFieldInAppropriateClass(@Nullable Symbol symbol) { |
| if (symbol == null) { |
| return false; |
| } |
| return symbol.getKind().isField() |
| && fieldSymbolIsAppropriate(symbol) |
| && classIsAppropriate(symbol.owner.enclClass()); |
| } |
| |
| abstract boolean fieldSymbolIsAppropriate(Symbol symbol); |
| |
| abstract boolean classIsAppropriate(ClassSymbol classSymbol); |
| } |
| } |