log4j-core/src/main/java/org/apache/logging/log4j/core/layout/internal/IncludeChecker.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.logging.log4j.core.layout.internal;

import java.util.List;

/**
 * Includes only the listed keys.
 */
public class IncludeChecker implements ListChecker {
    private final List<String> list;

    public IncludeChecker(final List<String> list) {
        this.list = list;
    }
    @Override
    public boolean check(final String key) {
        return list.contains(key);
    }

    @Override
    public String toString() {
        return "ThreadContextIncludes=" + list.toString();
    }
}