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IgnoringCasts.java
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/
IgnoringCasts.java
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/*
* 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.
*/
package com.google.errorprone.bugpatterns.collectionincompatibletype;
import static com.google.errorprone.util.ASTHelpers.getType;
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;
/**
* A utility for handling types in cast expressions, shraed by {@link JUnitIncompatibleType} and
* {@link TruthIncompatibleType}.
*/
final class IgnoringCasts {
/**
* 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);
}
@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;
}
@Override
public Type visitParenthesized(ParenthesizedTree node, Void unused) {
return node.getExpression().accept(this, null);
}
}.visit(tree, null);
}
private IgnoringCasts() {}
}