001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017package org.apache.logging.log4j.core.config.arbiters;
018
019import java.util.List;
020import java.util.Optional;
021
022import org.apache.logging.log4j.core.config.Node;
023import org.apache.logging.log4j.core.config.plugins.Plugin;
024import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory;
025
026/**
027 * Class Description goes here.
028 */
029@Plugin(name = "Select", category = Node.CATEGORY, elementType = Arbiter.ELEMENT_TYPE, deferChildren = true,
030        printObject = true)
031public class SelectArbiter {
032
033    public Arbiter evaluateConditions(List<Arbiter> conditions) {
034        Optional<Arbiter> opt = conditions.stream().filter((c) -> c instanceof DefaultArbiter)
035                .reduce((a, b) -> {
036                    throw new IllegalStateException("Multiple elements: " + a + ", " + b);
037                });
038        for (Arbiter condition : conditions) {
039            if (condition instanceof DefaultArbiter) {
040                continue;
041            }
042            if (condition.isCondition()) {
043                return condition;
044            }
045        }
046        return opt.orElse(null);
047    }
048
049    @PluginBuilderFactory
050    public static Builder newBuilder() {
051        return new Builder();
052    }
053
054    public static class Builder implements org.apache.logging.log4j.core.util.Builder<SelectArbiter> {
055
056        public Builder asBuilder() {
057            return this;
058        }
059
060        public SelectArbiter build() {
061            return new SelectArbiter();
062        }
063    }
064}