com.google.errorprone.bugpatterns.PublicApiNamedStreamShouldReturnStream Maven / Gradle / Ivy
/*
* Copyright 2021 Google Inc. All Rights Reserved.
*
* 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.SUGGESTION;
import static com.google.errorprone.matchers.Matchers.allOf;
import static com.google.errorprone.matchers.Matchers.methodHasVisibility;
import static com.google.errorprone.matchers.Matchers.methodIsNamed;
import com.google.errorprone.BugPattern;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.BugChecker.MethodTreeMatcher;
import com.google.errorprone.matchers.Description;
import com.google.errorprone.matchers.Matcher;
import com.google.errorprone.matchers.MethodVisibility;
import com.google.errorprone.util.ASTHelpers;
import com.sun.source.tree.MethodTree;
import com.sun.tools.javac.code.Type;
/**
* Checks if public APIs named "stream" returns a type whose name ends with Stream.
*
* @author [email protected] (Saurav Tiwary)
*/
@BugPattern(
summary =
"Public methods named stream() are generally expected to return a type whose name ends with"
+ " Stream. Consider choosing a different method name instead.",
severity = SUGGESTION)
public class PublicApiNamedStreamShouldReturnStream extends BugChecker
implements MethodTreeMatcher {
private static final String STREAM = "stream";
private static final Matcher CONFUSING_PUBLIC_API_STREAM_MATCHER =
allOf(
methodIsNamed(STREAM),
methodHasVisibility(MethodVisibility.Visibility.PUBLIC),
PublicApiNamedStreamShouldReturnStream::returnTypeDoesNotEndsWithStream);
private static boolean returnTypeDoesNotEndsWithStream(
MethodTree methodTree, VisitorState state) {
Type returnType = ASTHelpers.getSymbol(methodTree).getReturnType();
// Constructors have no return type.
return returnType != null && !returnType.tsym.getSimpleName().toString().endsWith("Stream");
}
@Override
public Description matchMethod(MethodTree tree, VisitorState state) {
if (!CONFUSING_PUBLIC_API_STREAM_MATCHER.matches(tree, state)) {
return Description.NO_MATCH;
}
return describeMatch(tree);
}
}