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The Apache Log4j Implementation

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/*
 * 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.pattern;

import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.status.StatusLogger;


/**
 * AbstractPatternConverter is an abstract class that provides the formatting functionality that derived classes need.
 * 
 * Conversion specifiers in a conversion patterns are parsed to individual PatternConverters. Each of which is
 * responsible for converting an object in a converter specific manner.
 * 
 */
public abstract class AbstractPatternConverter implements PatternConverter {
    /**
     * Allow subclasses access to the status logger.
     */
    protected static final Logger LOGGER = StatusLogger.getLogger();

    /**
     * Converter name.
     */
    private final String name;

    /**
     * Converter style name.
     */
    private final String style;

    /**
     * Create a new pattern converter.
     *
     * @param name  name for pattern converter.
     * @param style CSS style for formatted output.
     */
    protected AbstractPatternConverter(final String name, final String style) {
        this.name = name;
        this.style = style;
    }

    /**
     * This method returns the name of the conversion pattern.
     * 
     * The name can be useful to certain Layouts such as HtmlLayout.
     * 
     *
     * @return the name of the conversion pattern
     */
    @Override
    public final String getName() {
        return name;
    }

    /**
     * This method returns the CSS style class that should be applied to the LoggingEvent passed as parameter, which can
     * be null.
     * 
     * This information is currently used only by HtmlLayout.
     * 
     *
     * @param e
     *        null values are accepted
     * @return the name of the conversion pattern
     */
    @Override
    public String getStyleClass(final Object e) {
        return style;
    }
}