com.cloudbees.syslog.integration.jul.util.LevelHelper Maven / Gradle / Ivy

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/**
 * Copyright 2010-2016 OrientDB LTD (http://orientdb.com)
 *
 * 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.
 *
 * For more information: http://www.orientdb.com
 */
package com.cloudbees.syslog.integration.jul.util;

import com.cloudbees.syslog.Severity;

import java.util.*;
import java.util.logging.Level;

/**
 * @author Cyrille Le Clerc
 */
public class LevelHelper {

    public static final List levels = Collections.unmodifiableList(Arrays.asList(Level.OFF, Level.SEVERE, Level.WARNING, Level.INFO, Level.CONFIG,
            Level.FINE, Level.FINER, Level.FINEST, Level.ALL));

    public static final Map levelsByName;
    public static final Map levelsByValue;
    private static final Map julLevelToSyslogSeverity;

    static {
        Map levelsByNameMap = new HashMap();
        Map levelsByValueMap = new HashMap();
        for (Level level : levels) {
            levelsByNameMap.put(level.getName(), level);
            levelsByValueMap.put(level.intValue(), level);
        }
        levelsByName = Collections.unmodifiableMap(levelsByNameMap);
        levelsByValue = Collections.unmodifiableMap(levelsByValueMap);

        julLevelToSyslogSeverity = Collections.unmodifiableMap(new HashMap() {
            {
                put(Level.CONFIG, Severity.INFORMATIONAL);
                put(Level.FINE, Severity.DEBUG);
                put(Level.FINER, Severity.DEBUG);
                put(Level.FINEST, Severity.DEBUG);
                put(Level.INFO, Severity.INFORMATIONAL);
                put(Level.SEVERE, Severity.ERROR);
                put(Level.WARNING, Severity.WARNING);
            }
        });
    }

    /**
     * Simplification: use delegate to {@link Level#parse(String)} even if the behavior is slightly different for localized log levels.
     *
     * @param name {@code null} or empty returns {@code null}
     * @return
     */
    public static Level findLevel(String name) {
        if(name == null || name.isEmpty())
            return null;
        return Level.parse(name);

    }

    public static Severity toSeverity(Level level) {
        return julLevelToSyslogSeverity.get(level);
    }

    /**
     * Compare on {@link java.util.logging.Level#intValue()}
     */
    public static Comparator comparator() {
        return new Comparator() {
            @Override
            public int compare(Level l1, Level l2) {
                return Integer.compare(l1.intValue(), l2.intValue());
            }
        };
    }
}