/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.adversaries;

import static java.util.stream.Collectors.toSet;

import java.lang.StackWalker.StackFrame;
import java.lang.reflect.Method;
import java.util.Set;
import java.util.function.Predicate;
import java.util.stream.Stream;

/**
 * An adversary that delegates failure injection only when invoked through certain methods.
 */
public class MethodGuardedAdversary extends StackTraceElementGuardedAdversary {
    public MethodGuardedAdversary(Adversary delegate, Method... victimMethodSet) {
        super(delegate, new MethodsFramePredicate(victimMethodSet));
    }

    private static class MethodsFramePredicate implements Predicate<StackFrame> {
        private final Set<String> victimMethods;

        MethodsFramePredicate(Method... victimMethodSet) {
            victimMethods = Stream.of(victimMethodSet).map(Method::getName).collect(toSet());
        }

        @Override
        public boolean test(StackFrame stackFrame) {
            return victimMethods.contains(stackFrame.getMethodName());
        }
    }
}
