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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements. See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache license, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License. You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the license for the specific language governing permissions and
15   * limitations under the license.
16   */
17  package org.apache.logging.log4j.core.pattern;
18  
19  import java.util.Date;
20  
21  import org.apache.logging.log4j.core.config.plugins.Plugin;
22  import org.apache.logging.log4j.util.PerformanceSensitive;
23  
24  /**
25   * Formats an integer.
26   */
27  @Plugin(name = "IntegerPatternConverter", category = "FileConverter")
28  @ConverterKeys({ "i", "index" })
29  @PerformanceSensitive("allocation")
30  public final class IntegerPatternConverter extends AbstractPatternConverter implements ArrayPatternConverter {
31  
32      /**
33       * Singleton.
34       */
35      private static final IntegerPatternConverter INSTANCE = new IntegerPatternConverter();
36  
37      /**
38       * Private constructor.
39       */
40      private IntegerPatternConverter() {
41          super("Integer", "integer");
42      }
43  
44      /**
45       * Obtains an instance of pattern converter.
46       *
47       * @param options options, may be null.
48       * @return instance of pattern converter.
49       */
50      public static IntegerPatternConverter newInstance(final String[] options) {
51          return INSTANCE;
52      }
53  
54      @Override
55      public void format(final StringBuilder toAppendTo, final Object... objects) {
56          for (int i = 0; i < objects.length; i++) {
57              if (objects[i] instanceof Integer) {
58                  format(objects[i], toAppendTo);
59                  break;
60              } else if (objects[i] instanceof NotANumber) {
61                  toAppendTo.append(NotANumber.VALUE);
62                  break;
63              }
64          }
65      }
66  
67      /**
68       * {@inheritDoc}
69       */
70      @Override
71      public void format(final Object obj, final StringBuilder toAppendTo) {
72          if (obj instanceof Integer) {
73              toAppendTo.append(((Integer) obj).intValue());
74          } else if (obj instanceof Date) {
75              toAppendTo.append(((Date) obj).getTime());
76          }
77      }
78  }