com.google.errorprone.bugpatterns.LongFloatConversion Maven / Gradle / Ivy
/*
* Copyright 2020 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;
import static com.google.errorprone.BugPattern.SeverityLevel.WARNING;
import static com.google.errorprone.matchers.Description.NO_MATCH;
import static com.google.errorprone.util.ASTHelpers.getType;
import static com.google.errorprone.util.ASTHelpers.targetType;
import com.google.errorprone.BugPattern;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher;
import com.google.errorprone.fixes.SuggestedFix;
import com.google.errorprone.matchers.Description;
import com.google.errorprone.util.ASTHelpers;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.tree.MethodInvocationTree;
import com.sun.source.util.TreePath;
import javax.lang.model.type.TypeKind;
/** A {@link BugChecker}; see the associated {@link BugPattern} annotation for details. */
@BugPattern(
name = "LongFloatConversion",
summary =
"Conversion from long to float may lose precision; use an explicit cast to float if this"
+ " was intentional",
severity = WARNING)
public class LongFloatConversion extends BugChecker implements MethodInvocationTreeMatcher {
@Override
public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
for (ExpressionTree arg : tree.getArguments()) {
if (!getType(arg).getKind().equals(TypeKind.LONG)) {
continue;
}
ASTHelpers.TargetType targetType =
targetType(state.withPath(new TreePath(state.getPath(), arg)));
if (targetType == null) {
continue;
}
if (targetType.type().getKind().equals(TypeKind.FLOAT)) {
state.reportMatch(describeMatch(arg, SuggestedFix.prefixWith(arg, "(float) ")));
}
}
return NO_MATCH;
}
}