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