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   /*
    * Copyright 2015 The Netty Project
    *
    * The Netty Project 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:
    *
    * https://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 io.netty.handler.codec;
  
  import io.netty.util.AsciiString;
  import io.netty.util.internal.PlatformDependent;
  
  import java.text.ParseException;
  import java.util.Date;
  
  /**
   * Converts to/from native types, general {@link Object}, and {@link CharSequence}s.
   */
  public class CharSequenceValueConverter implements ValueConverter<CharSequence> {
      public static final CharSequenceValueConverter INSTANCE = new CharSequenceValueConverter();
      private static final AsciiString TRUE_ASCII = new AsciiString("true");
  
      @Override
      public CharSequence convertObject(Object value) {
          if (value instanceof CharSequence) {
              return (CharSequence) value;
          }
          return value.toString();
      }
  
      @Override
      public CharSequence convertInt(int value) {
          return String.valueOf(value);
      }
  
      @Override
      public CharSequence convertLong(long value) {
          return String.valueOf(value);
      }
  
      @Override
      public CharSequence convertDouble(double value) {
          return String.valueOf(value);
      }
  
      @Override
      public CharSequence convertChar(char value) {
          return String.valueOf(value);
      }
  
      @Override
      public CharSequence convertBoolean(boolean value) {
          return String.valueOf(value);
      }
  
      @Override
      public CharSequence convertFloat(float value) {
          return String.valueOf(value);
      }
  
      @Override
      public boolean convertToBoolean(CharSequence value) {
          return AsciiString.contentEqualsIgnoreCase(value, TRUE_ASCII);
      }
  
      @Override
      public CharSequence convertByte(byte value) {
          return String.valueOf(value);
      }
  
      @Override
      public byte convertToByte(CharSequence value) {
          if (value instanceof AsciiString && value.length() == 1) {
              return ((AsciiString) value).byteAt(0);
          }
          return Byte.parseByte(value.toString());
      }
  
      @Override
      public char convertToChar(CharSequence value) {
          return value.charAt(0);
      }
  
      @Override
      public CharSequence convertShort(short value) {
          return String.valueOf(value);
      }
  
      @Override
      public short convertToShort(CharSequence value) {
          if (value instanceof AsciiString) {
              return ((AsciiString) value).parseShort();
         }
         return Short.parseShort(value.toString());
     }
 
     @Override
     public int convertToInt(CharSequence value) {
         if (value instanceof AsciiString) {
             return ((AsciiString) value).parseInt();
         }
         return Integer.parseInt(value.toString());
     }
 
     @Override
     public long convertToLong(CharSequence value) {
         if (value instanceof AsciiString) {
             return ((AsciiString) value).parseLong();
         }
         return Long.parseLong(value.toString());
     }
 
     @Override
     public CharSequence convertTimeMillis(long value) {
         return DateFormatter.format(new Date(value));
     }
 
     @Override
     public long convertToTimeMillis(CharSequence value) {
         Date date = DateFormatter.parseHttpDate(value);
         if (date == null) {
             PlatformDependent.throwException(new ParseException("header can't be parsed into a Date: " + value, 0));
             return 0;
         }
         return date.getTime();
     }
 
     @Override
     public float convertToFloat(CharSequence value) {
         if (value instanceof AsciiString) {
             return ((AsciiString) value).parseFloat();
         }
         return Float.parseFloat(value.toString());
     }
 
     @Override
     public double convertToDouble(CharSequence value) {
         if (value instanceof AsciiString) {
             return ((AsciiString) value).parseDouble();
         }
         return Double.parseDouble(value.toString());
     }
 }