content: /*
   * Copyright 2006-2007 Jeremias Maerki.
   *
   * Licensed 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 com.ailiwean.core.zxing.core.datamatrix.encoder;
  
  
  final class ASCIIEncoder implements Encoder {
  
    @Override
    public int getEncodingMode() {
      return HighLevelEncoder.ASCII_ENCODATION;
    }
  
    @Override
    public void encode(EncoderContext context) {
      //step B
      int n = HighLevelEncoder.determineConsecutiveDigitCount(context.getMessage(), context.pos);
      if (n >= 2) {
        context.writeCodeword(encodeASCIIDigits(context.getMessage().charAt(context.pos),
                                                context.getMessage().charAt(context.pos + 1)));
        context.pos += 2;
      } else {
        char c = context.getCurrentChar();
        int newMode = HighLevelEncoder.lookAheadTest(context.getMessage(), context.pos, getEncodingMode());
        if (newMode != getEncodingMode()) {
          switch (newMode) {
            case HighLevelEncoder.BASE256_ENCODATION:
              context.writeCodeword(HighLevelEncoder.LATCH_TO_BASE256);
              context.signalEncoderChange(HighLevelEncoder.BASE256_ENCODATION);
              return;
            case HighLevelEncoder.C40_ENCODATION:
              context.writeCodeword(HighLevelEncoder.LATCH_TO_C40);
              context.signalEncoderChange(HighLevelEncoder.C40_ENCODATION);
              return;
            case HighLevelEncoder.X12_ENCODATION:
              context.writeCodeword(HighLevelEncoder.LATCH_TO_ANSIX12);
              context.signalEncoderChange(HighLevelEncoder.X12_ENCODATION);
              break;
            case HighLevelEncoder.TEXT_ENCODATION:
              context.writeCodeword(HighLevelEncoder.LATCH_TO_TEXT);
              context.signalEncoderChange(HighLevelEncoder.TEXT_ENCODATION);
              break;
            case HighLevelEncoder.EDIFACT_ENCODATION:
              context.writeCodeword(HighLevelEncoder.LATCH_TO_EDIFACT);
              context.signalEncoderChange(HighLevelEncoder.EDIFACT_ENCODATION);
              break;
            default:
              throw new IllegalStateException("Illegal mode: " + newMode);
          }
        } else if (HighLevelEncoder.isExtendedASCII(c)) {
          context.writeCodeword(HighLevelEncoder.UPPER_SHIFT);
          context.writeCodeword((char) (c - 128 + 1));
          context.pos++;
        } else {
          context.writeCodeword((char) (c + 1));
          context.pos++;
        }
  
      }
    }
  
    private static char encodeASCIIDigits(char digit1, char digit2) {
      if (HighLevelEncoder.isDigit(digit1) && HighLevelEncoder.isDigit(digit2)) {
        int num = (digit1 - 48) * 10 + (digit2 - 48);
        return (char) (num + 130);
      }
      throw new IllegalArgumentException("not digits: " + digit1 + digit2);
    }
  
  }
  