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.pattern;
018
019import java.util.Date;
020
021import org.apache.logging.log4j.core.config.plugins.Plugin;
022import org.apache.logging.log4j.util.PerformanceSensitive;
023
024/**
025 * Formats an integer.
026 */
027@Plugin(name = "IntegerPatternConverter", category = "FileConverter")
028@ConverterKeys({ "i", "index" })
029@PerformanceSensitive("allocation")
030public final class IntegerPatternConverter extends AbstractPatternConverter implements ArrayPatternConverter {
031
032    /**
033     * Singleton.
034     */
035    private static final IntegerPatternConverter INSTANCE = new IntegerPatternConverter();
036
037    /**
038     * Private constructor.
039     */
040    private IntegerPatternConverter() {
041        super("Integer", "integer");
042    }
043
044    /**
045     * Obtains an instance of pattern converter.
046     *
047     * @param options options, may be null.
048     * @return instance of pattern converter.
049     */
050    public static IntegerPatternConverter newInstance(final String[] options) {
051        return INSTANCE;
052    }
053
054    @Override
055    public void format(final StringBuilder toAppendTo, final Object... objects) {
056        for (int i = 0; i < objects.length; i++) {
057            if (objects[i] instanceof Integer) {
058                format(objects[i], toAppendTo);
059                break;
060            } else if (objects[i] instanceof NotANumber) {
061                toAppendTo.append(NotANumber.VALUE);
062                break;
063            }
064        }
065    }
066
067    /**
068     * {@inheritDoc}
069     */
070    @Override
071    public void format(final Object obj, final StringBuilder toAppendTo) {
072        if (obj instanceof Integer) {
073            toAppendTo.append(((Integer) obj).intValue());
074        } else if (obj instanceof Date) {
075            toAppendTo.append(((Date) obj).getTime());
076        }
077    }
078}