com.google.errorprone.bugpatterns.checkreturnvalue.Rules Maven / Gradle / Ivy
/*
* Copyright 2022 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.checkreturnvalue;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.errorprone.util.ASTHelpers.hasDirectAnnotationWithSimpleName;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.checkreturnvalue.ResultUseRule.GlobalRule;
import com.google.errorprone.bugpatterns.checkreturnvalue.ResultUseRule.MethodRule;
import com.google.errorprone.bugpatterns.checkreturnvalue.ResultUseRule.SymbolRule;
import com.sun.tools.javac.code.Symbol;
import com.sun.tools.javac.code.Symbol.MethodSymbol;
import java.util.Optional;
import java.util.function.BiPredicate;
/** Factories for common kinds of {@link ResultUseRule}s. */
public final class Rules {
private Rules() {}
/** A {@link MethodRule} for Error Prone. */
abstract static class ErrorProneMethodRule
extends MethodRule {
ErrorProneMethodRule() {
super(MethodSymbol.class);
}
}
/**
* Returns a simple global rule that always returns the given defaults for methods and
* constructors.
*/
public static ResultUseRule globalDefault(
Optional methodDefault, Optional constructorDefault) {
return new SimpleGlobalRule("GLOBAL_DEFAULT", methodDefault, constructorDefault);
}
/**
* Returns a {@link ResultUseRule} that maps annotations with the given {@code simpleName} to the
* given {@code policy}.
*/
public static ResultUseRule mapAnnotationSimpleName(
String simpleName, ResultUsePolicy policy) {
return new SimpleRule(
"ANNOTATION @" + simpleName,
(sym, st) -> hasDirectAnnotationWithSimpleName(sym, simpleName),
policy);
}
private static final class SimpleRule extends SymbolRule {
private final String name;
private final BiPredicate predicate;
private final ResultUsePolicy policy;
private SimpleRule(
String name, BiPredicate predicate, ResultUsePolicy policy) {
this.name = name;
this.predicate = predicate;
this.policy = policy;
}
@Override
public String id() {
return name;
}
@Override
public Optional evaluate(Symbol symbol, VisitorState state) {
return predicate.test(symbol, state) ? Optional.of(policy) : Optional.empty();
}
}
private static final class SimpleGlobalRule extends GlobalRule {
private final String id;
private final Optional methodDefault;
private final Optional constructorDefault;
private SimpleGlobalRule(
String id,
Optional methodDefault,
Optional constructorDefault) {
this.id = checkNotNull(id);
this.methodDefault = methodDefault;
this.constructorDefault = constructorDefault;
}
@Override
public String id() {
return id;
}
@Override
public Optional evaluate(Symbol symbol, VisitorState context) {
return symbol.isConstructor() ? constructorDefault : methodDefault;
}
}
}