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Fix a crash in JUnitIncompatibleType
Fixes #4291 PiperOrigin-RevId: 625359890
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...main/java/com/google/errorprone/bugpatterns/collectionincompatibletype/IgnoringCasts.java
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| @@ -0,0 +1,62 @@ | ||
| /* | ||
| * Copyright 2024 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. | ||
| */ | ||
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|
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| package com.google.errorprone.bugpatterns.collectionincompatibletype; | ||
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| import static com.google.errorprone.util.ASTHelpers.getType; | ||
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| import com.google.errorprone.VisitorState; | ||
| import com.sun.source.tree.ParenthesizedTree; | ||
| import com.sun.source.tree.Tree; | ||
| import com.sun.source.tree.TypeCastTree; | ||
| import com.sun.source.util.SimpleTreeVisitor; | ||
| import com.sun.tools.javac.code.Type; | ||
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| /** | ||
| * A utility for handling types in cast expressions, shraed by {@link JUnitIncompatibleType} and | ||
| * {@link TruthIncompatibleType}. | ||
| */ | ||
| final class IgnoringCasts { | ||
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| /** | ||
| * Returns the most specific type of a cast or its operand, for example returns {@code byte[]} for | ||
| * both {@code (byte[]) someObject} and {@code (Object) someByteArray}. | ||
| */ | ||
| static Type ignoringCasts(Tree tree, VisitorState state) { | ||
| return new SimpleTreeVisitor<Type, Void>() { | ||
| @Override | ||
| protected Type defaultAction(Tree node, Void unused) { | ||
| return getType(node); | ||
| } | ||
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| @Override | ||
| public Type visitTypeCast(TypeCastTree node, Void unused) { | ||
| Type castType = getType(node); | ||
| Type expressionType = node.getExpression().accept(this, null); | ||
| return (castType.isPrimitive() || state.getTypes().isSubtype(castType, expressionType)) | ||
| ? castType | ||
| : expressionType; | ||
| } | ||
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| @Override | ||
| public Type visitParenthesized(ParenthesizedTree node, Void unused) { | ||
| return node.getExpression().accept(this, null); | ||
| } | ||
| }.visit(tree, null); | ||
| } | ||
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| private IgnoringCasts() {} | ||
| } |
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