com.google.zxing.datamatrix.encoder.ASCIIEncoder Maven / Gradle / Ivy
/*
* 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.google.zxing.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);
}
}