/*
    * 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 java.util.Date;
  
  import org.apache.logging.log4j.core.config.plugins.Plugin;
  import org.apache.logging.log4j.util.PerformanceSensitive;
  
  /**
   * Formats an integer.
   */
  @Plugin(name = "IntegerPatternConverter", category = "FileConverter")
  @ConverterKeys({ "i", "index" })
  @PerformanceSensitive("allocation")
  public final class IntegerPatternConverter extends AbstractPatternConverter implements ArrayPatternConverter {
  
      /**
       * Singleton.
       */
      private static final IntegerPatternConverter INSTANCE = new IntegerPatternConverter();
  
      /**
       * Private constructor.
       */
      private IntegerPatternConverter() {
          super("Integer", "integer");
      }
  
      /**
       * Obtains an instance of pattern converter.
       *
       * @param options options, may be null.
       * @return instance of pattern converter.
       */
      public static IntegerPatternConverter newInstance(final String[] options) {
          return INSTANCE;
      }
  
      @Override
      public void format(final StringBuilder toAppendTo, final Object... objects) {
          for (int i = 0; i < objects.length; i++) {
              if (objects[i] instanceof Integer) {
                  format(objects[i], toAppendTo);
                  break;
              } else if (objects[i] instanceof NotANumber) {
                  toAppendTo.append(NotANumber.VALUE);
                  break;
              }
          }
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void format(final Object obj, final StringBuilder toAppendTo) {
          if (obj instanceof Integer) {
              toAppendTo.append(((Integer) obj).intValue());
          } else if (obj instanceof Date) {
              toAppendTo.append(((Date) obj).getTime());
          }
      }
  }