private DecodedInformation parseBlocks() throws FormatException {
boolean isFinished;
BlockParsedResult result;
do {
int initialPosition = current.getPosition();
if (current.isAlpha()) {
result = parseAlphaBlock();
isFinished = result.isFinished();
} else if (current.isIsoIec646()) {
result = parseIsoIec646Block();
isFinished = result.isFinished();
} else { // it must be numeric
result = parseNumericBlock();
isFinished = result.isFinished();
}
boolean positionChanged = initialPosition != current.getPosition();
if (!positionChanged && !isFinished) {
break;
}
} while (!isFinished);
return result.getDecodedInformation();
}
private BlockParsedResult parseNumericBlock() throws FormatException {
while (isStillNumeric(current.getPosition())) {
DecodedNumeric numeric = decodeNumeric(current.getPosition());
current.setPosition(numeric.getNewPosition());
if (numeric.isFirstDigitFNC1()) {
DecodedInformation information;
if (numeric.isSecondDigitFNC1()) {
information = new DecodedInformation(current.getPosition(), buffer.toString());
} else {
information =
new DecodedInformation(
current.getPosition(), buffer.toString(), numeric.getSecondDigit());
}
return new BlockParsedResult(information, true);
}
buffer.append(numeric.getFirstDigit());
if (numeric.isSecondDigitFNC1()) {
DecodedInformation information =
new DecodedInformation(current.getPosition(), buffer.toString());
return new BlockParsedResult(information, true);
}
buffer.append(numeric.getSecondDigit());
}
if (isNumericToAlphaNumericLatch(current.getPosition())) {
current.setAlpha();
current.incrementPosition(4);
}
return new BlockParsedResult(false);
}
private BlockParsedResult parseAlphaBlock() {
while (isStillAlpha(current.getPosition())) {
DecodedChar alpha = decodeAlphanumeric(current.getPosition());
current.setPosition(alpha.getNewPosition());
if (alpha.isFNC1()) {
DecodedInformation information =
new DecodedInformation(current.getPosition(), buffer.toString());
return new BlockParsedResult(information, true); // end of the char block
}
buffer.append(alpha.getValue());
}
if (isAlphaOr646ToNumericLatch(current.getPosition())) {
current.incrementPosition(3);
current.setNumeric();
} else if (isAlphaTo646ToAlphaLatch(current.getPosition())) {
if (current.getPosition() + 5 < this.information.getSize()) {
current.incrementPosition(5);
} else {
current.setPosition(this.information.getSize());
}
current.setIsoIec646();
}
return new BlockParsedResult(false);
}
private BlockParsedResult parseIsoIec646Block() throws FormatException {
while (isStillIsoIec646(current.getPosition())) {
DecodedChar iso = decodeIsoIec646(current.getPosition());
current.setPosition(iso.getNewPosition());
if (iso.isFNC1()) {
DecodedInformation information =
new DecodedInformation(current.getPosition(), buffer.toString());
return new BlockParsedResult(information, true);
}
buffer.append(iso.getValue());
}
if (isAlphaOr646ToNumericLatch(current.getPosition())) {
current.incrementPosition(3);
current.setNumeric();
} else if (isAlphaTo646ToAlphaLatch(current.getPosition())) {
if (current.getPosition() + 5 < this.information.getSize()) {
current.incrementPosition(5);
} else {
current.setPosition(this.information.getSize());
}
current.setAlpha();
}
return new BlockParsedResult(false);
}