com.google.errorprone.bugpatterns.SystemExitOutsideMain Maven / Gradle / Ivy
/*
* Copyright 2018 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.Matchers.allOf;
import static com.google.errorprone.matchers.Matchers.enclosingMethod;
import static com.google.errorprone.matchers.Matchers.hasModifier;
import static com.google.errorprone.matchers.Matchers.isSameType;
import static com.google.errorprone.matchers.Matchers.methodHasArity;
import static com.google.errorprone.matchers.Matchers.methodHasParameters;
import static com.google.errorprone.matchers.Matchers.methodHasVisibility;
import static com.google.errorprone.matchers.Matchers.methodIsNamed;
import static com.google.errorprone.matchers.Matchers.methodReturns;
import static com.google.errorprone.matchers.Matchers.not;
import static com.google.errorprone.matchers.Matchers.staticMethod;
import static com.google.errorprone.matchers.MethodVisibility.Visibility.PUBLIC;
import static javax.lang.model.element.Modifier.STATIC;
import com.google.errorprone.BugPattern;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher;
import com.google.errorprone.matchers.Description;
import com.google.errorprone.matchers.Matcher;
import com.google.errorprone.suppliers.Suppliers;
import com.google.errorprone.util.ASTHelpers;
import com.sun.source.tree.ClassTree;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.tree.MethodInvocationTree;
import com.sun.source.tree.MethodTree;
import com.sun.source.tree.Tree;
import java.util.Optional;
/**
* Check for calls to {@code System.exit()} outside of a main method.
*
* @author [email protected] (Sabrina Seibel)
*/
@BugPattern(
name = "SystemExitOutsideMain",
summary = "Code that contains System.exit() is untestable.",
severity = WARNING)
public class SystemExitOutsideMain extends BugChecker implements MethodInvocationTreeMatcher {
private static final Matcher CALLS_TO_SYSTEM_EXIT =
staticMethod().onClass("java.lang.System").named("exit");
private static final Matcher MAIN_METHOD =
allOf(
methodHasArity(1),
methodHasVisibility(PUBLIC),
hasModifier(STATIC),
methodReturns(Suppliers.VOID_TYPE),
methodIsNamed("main"),
methodHasParameters(isSameType(Suppliers.arrayOf(Suppliers.STRING_TYPE))));
private static final Matcher CALLS_TO_SYSTEM_EXIT_OUTSIDE_MAIN =
allOf(CALLS_TO_SYSTEM_EXIT, not(enclosingMethod(MAIN_METHOD)));
@Override
public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
if (CALLS_TO_SYSTEM_EXIT_OUTSIDE_MAIN.matches(tree, state)) {
Optional mainMethodInThisClass =
ASTHelpers.findEnclosingNode(state.getPath(), ClassTree.class).getMembers().stream()
.filter(t -> t instanceof MethodTree)
.filter(t -> MAIN_METHOD.matches((MethodTree) t, state))
.findAny();
return mainMethodInThisClass.isPresent() ? Description.NO_MATCH : describeMatch(tree);
}
return Description.NO_MATCH;
}
}