/**
* Returns a string built using a particular grammar. Single-quotes strings are counted as literal
* strings, whereas all other strings appearing in the grammar require substitution with the
* corresponding value from the extraparams hashmap.
*/
private String buildGrammar(String grammar, Map<String, String> extraparams) {
StringBuilder outboundstring = new StringBuilder();
String[] fields = Pattern.compile("\\s+").split(grammar);
for (int i = 0; i < fields.length; i++) {
if (fields[i].substring(0, 1).equals("'")) {
outboundstring.append(fields[i].substring(1, fields[i].length() - 1));
} else {
outboundstring.append(extraparams.get(fields[i]));
}
}
return outboundstring.toString();
}
/**
* Returns the value of a specified fieldname from the specified hashmap and returns an integer
* value or throws an exception if the value is not an integer
*/
private int getIntValue(String fieldname, Map<String, String> extraparams) {
Matcher checkint = Pattern.compile("^\\d+$").matcher(fieldname);
int rv;
if (checkint.matches()) {
rv = Integer.parseInt(fieldname);
} else {
if (extraparams.containsKey(fieldname)) {
rv = Integer.parseInt(extraparams.get(fieldname));
} else {
rv = -1;
throw new TDTException(
"No integer value for " + fieldname + " can be found - check extraparams");
}
}
return rv;
}
/**
* Adds additional entries to the extraparams hashmap by processing various rules defined in the
* TDT definition files. Typically used for string processing functions, lookup in tables,
* calculation of check digits etc.
*/
private void processRules(Map<String, String> extraparams, Rule tdtrule) {
String tdtfunction = tdtrule.getFunction();
int openbracket = tdtfunction.indexOf("(");
assert openbracket != -1;
String params = tdtfunction.substring(openbracket + 1, tdtfunction.length() - 1);
String rulename = tdtfunction.substring(0, openbracket);
String[] parameter = params.split(",");
String newfieldname = tdtrule.getNewFieldName();
// System.out.println(tdtfunction + " " + parameter[0] + " " + extraparams.get(parameter[0]));
/**
* Stores in the hashmap extraparams the value obtained from a lookup in a specified XML table.
*
* <p>The first parameter is the given value already known. This is denoted as $1 in the
* corresponding XPath expression
*
* <p>The second parameter is the string filename of the table which must be present in the
* auxiliary subdirectory
*
* <p>The third parameter is the column in which the supplied input value should be sought
*
* <p>The fourth parameter is the column whose value should be read for the corresponding row,
* in order to obtain the result of the lookup.
*
* <p>The rule in the definition file may contain an XPath expression and a URL where the table
* may be obtained.
*/
if (rulename.equals("TABLELOOKUP")) {
// parameter[0] is given value
// parameter[1] is table
// parameter[2] is input column supplied
// parameter[3] is output column required
assert parameter.length == 4 : "incorrect number of parameters to tablelookup " + params;
if (parameter[1].equals("tdt64bitcpi")) {
String s = extraparams.get(parameter[0]);
assert s != null : tdtfunction + " when " + parameter[0] + " is null";
String t = gs1cpi.get(s);
assert t != null : "gs1cpi[" + s + "] is null";
assert newfieldname != null;
extraparams.put(newfieldname, t);
// extraparams.put(newfieldname, gs1cpi.get(extraparams.get(parameter[0])));
} else { // JPB! the following is untested
String tdtxpath = tdtrule.getTableXPath();
String tdttableurl = tdtrule.getTableURL();
String tdtxpathsub = tdtxpath.replaceAll("\\$1", extraparams.get(parameter[0]));
extraparams.put(newfieldname, xpathlookup("ManagerTranslation.xml", tdtxpathsub));
}
}
/**
* Stores the length of the specified string under the new fieldname specified by the
* corresponding rule of the definition file.
*/
if (rulename.equals("LENGTH")) {
assert extraparams.get(parameter[0]) != null
: tdtfunction + " when " + parameter[0] + " is null";
if (extraparams.get(parameter[0]) != null) {
extraparams.put(newfieldname, Integer.toString(extraparams.get(parameter[0]).length()));
}
}
/**
* Stores a GS1 check digit in the extraparams hashmap, keyed under the new fieldname specified
* by the corresponding rule of the definition file.
*/
if (rulename.equals("GS1CHECKSUM")) {
assert extraparams.get(parameter[0]) != null
: tdtfunction + " when " + parameter[0] + " is null";
if (extraparams.get(parameter[0]) != null) {
extraparams.put(newfieldname, gs1checksum(extraparams.get(parameter[0])));
}
}
/**
* Obtains a substring of the string provided as the first parameter. If only a single second
* parameter is specified, then this is considered as the start index and all characters from
* the start index onwards are stored in the extraparams hashmap under the key named
* 'newfieldname' in the corresponding rule of the definition file. If a second and third
* parameter are specified, then the second parameter is the start index and the third is the
* length of characters required. A substring consisting characters from the start index up to
* the required length of characters is stored in the extraparams hashmap, keyed under the new
* fieldname specified by the corresponding rule of the defintion file.
*/
if (rulename.equals("SUBSTR")) {
assert extraparams.get(parameter[0]) != null
: tdtfunction + " when " + parameter[0] + " is null";
if (parameter.length == 2) {
if (extraparams.get(parameter[0]) != null) {
int start = getIntValue(parameter[1], extraparams);
if (start >= 0) {
extraparams.put(newfieldname, extraparams.get(parameter[0]).substring(start));
}
}
}
if (parameter.length
== 3) { // need to check that this variation is correct - c.f. Perl substr
assert extraparams.get(parameter[0]) != null
: tdtfunction + " when " + parameter[0] + " is null";
if (extraparams.get(parameter[0]) != null) {
int start = getIntValue(parameter[1], extraparams);
int end = getIntValue(parameter[2], extraparams);
if ((start >= 0) && (end >= 0)) {
extraparams.put(
newfieldname, extraparams.get(parameter[0]).substring(start, start + end));
}
}
}
}
/**
* Concatenates specified string parameters together. Literal values must be enclosed within
* single or double quotes or consist of unquoted digits. Other unquoted strings are considered
* as fieldnames and the corresponding value from the extraparams hashmap are inserted. The
* result of the concatenation (and substitution) of the strings is stored as a new entry in the
* extraparams hashmap, keyed under the new fieldname specified by the rule.
*/
if (rulename.equals("CONCAT")) {
StringBuilder buffer = new StringBuilder();
for (int p1 = 0; p1 < parameter.length; p1++) {
Matcher matcher = Pattern.compile("\"(.*?)\"|'(.*?)'|[0-9]").matcher(parameter[p1]);
if (matcher.matches()) {
buffer.append(parameter[p1]);
} else {
assert extraparams.get(parameter[p1]) != null
: tdtfunction + " when " + parameter[p1] + " is null";
if (extraparams.get(parameter[p1]) != null) {
buffer.append(extraparams.get(parameter[p1]));
}
}
}
extraparams.put(newfieldname, buffer.toString());
}
}
/** convert from a particular scheme / level */
private String convertLevel(
Scheme tdtscheme,
Level tdtlevel,
String input,
Map<String, String> inputParameters,
LevelTypeList outboundlevel) {
String outboundstring;
Map<String, String> extraparams =
// new NoisyMap
(new HashMap<String, String>(inputParameters));
// get the scheme's option key, which is the name of a
// parameter whose value is matched to the option key of the
// level.
String optionkey = tdtscheme.getOptionKey();
String optionValue = extraparams.get(optionkey);
// the name of a parameter which allows the appropriate option
// to be selected
// now consider the various options within the scheme and
// level for each option element inside the level, check
// whether the pattern attribute matches as a regular
// expression
String matchingOptionKey = null;
Option matchingOption = null;
Matcher prefixMatcher = null;
for (Enumeration e = tdtlevel.enumerateOption(); e.hasMoreElements(); ) {
Option opt = (Option) e.nextElement();
if (optionValue == null || optionValue.equals(opt.getOptionKey())) {
// possible match
Matcher matcher = Pattern.compile(opt.getPattern()).matcher(input);
if (matcher.matches()) {
if (prefixMatcher != null) throw new TDTException("Multiple patterns matched");
prefixMatcher = matcher;
matchingOptionKey = opt.getOptionKey();
matchingOption = opt;
}
}
}
if (prefixMatcher == null) throw new TDTException("No patterns matched");
optionValue = matchingOptionKey;
for (Enumeration e = matchingOption.enumerateField(); e.hasMoreElements(); ) {
Field field = (Field) e.nextElement();
int seq = field.getSeq();
String strfieldname = field.getName();
int fieldlength = field.getLength();
String strfieldvalue = prefixMatcher.group(seq);
// System.out.println(" processing field " + strfieldname + " = '" + strfieldvalue + "'");
if (field.getCompaction() == null) {
// if compaction is null, treat field as an integer
if (field.getCharacterSet() != null) { // if the character set is specified
Matcher charsetmatcher =
Pattern.compile("^" + field.getCharacterSet() + "$").matcher(strfieldvalue);
if (!charsetmatcher.matches()) {
throw new TDTException(
"field "
+ strfieldname
+ " ("
+ strfieldvalue
+ ") does not conform to the allowed character set ("
+ field.getCharacterSet()
+ ") ");
}
}
BigInteger bigvalue = null;
if (tdtlevel.getType() == LevelTypeList.BINARY) { // if the input was BINARY
bigvalue = new BigInteger(strfieldvalue, 2);
extraparams.put(strfieldname, bigvalue.toString());
} else {
if (field.getDecimalMinimum() != null || field.getDecimalMaximum() != null)
bigvalue = new BigInteger(strfieldvalue);
extraparams.put(strfieldname, strfieldvalue);
}
if (field.getDecimalMinimum() != null) { // if the decimal minimum is specified
BigInteger bigmin = new BigInteger(field.getDecimalMinimum());
if (bigvalue.compareTo(bigmin)
== -1) { // throw an exception if the field value is less than the decimal minimum
throw new TDTException(
"field "
+ strfieldname
+ " ("
+ bigvalue
+ ") is less than DecimalMinimum ("
+ field.getDecimalMinimum()
+ ") allowed");
}
}
if (field.getDecimalMaximum() != null) { // if the decimal maximum is specified
BigInteger bigmax = new BigInteger(field.getDecimalMaximum());
if (bigvalue.compareTo(bigmax)
== 1) { // throw an excpetion if the field value is greater than the decimal maximum
throw new TDTException(
"field "
+ strfieldname
+ " ("
+ bigvalue
+ ") is greater than DecimalMaximum ("
+ field.getDecimalMaximum()
+ ") allowed");
}
}
// after extracting the field, it may be necessary to pad it.
padField(extraparams, field);
} else {
// compaction is specified - interpret binary as a string value using a truncated byte per
// character
CompactionMethodList compaction = field.getCompaction();
PadDirectionList padDir = field.getPadDir();
String padchar = field.getPadChar();
String s;
if (compaction == CompactionMethodList.VALUE_5)
// "5-bit"
s = bin2uppercasefive(strfieldvalue);
else if (compaction == CompactionMethodList.VALUE_4)
// 6-bit
s = bin2alphanumsix(strfieldvalue);
else if (compaction == CompactionMethodList.VALUE_3)
// 7-bit
s = bin2asciiseven(strfieldvalue);
else if (compaction == CompactionMethodList.VALUE_2)
// 8-bit
s = bin2bytestring(strfieldvalue);
else throw new Error("unsupported compaction method " + compaction);
extraparams.put(strfieldname, stripPadChar(s, padDir, padchar));
}
} // for each field;
/**
* the EXTRACT rules are performed after parsing the input, in order to determine additional
* fields that are to be derived from the fields obtained by the pattern match process
*/
int seq = 0;
for (Enumeration e = tdtlevel.enumerateRule(); e.hasMoreElements(); ) {
Rule tdtrule = (Rule) e.nextElement();
if (tdtrule.getType() == ModeList.EXTRACT) {
assert seq < tdtrule.getSeq() : "Rule out of sequence order";
seq = tdtrule.getSeq();
processRules(extraparams, tdtrule);
}
}
/**
* Now we need to consider the corresponding output level and output option. The scheme must
* remain the same, as must the value of optionkey (to select the corresponding option element
* nested within the required outbound level)
*/
Level tdtoutlevel = findLevel(tdtscheme, outboundlevel);
Option tdtoutoption = findOption(tdtoutlevel, optionValue);
/**
* the FORMAT rules are performed before formatting the output, in order to determine additional
* fields that are required for preparation of the outbound format
*/
seq = 0;
for (Enumeration e = tdtoutlevel.enumerateRule(); e.hasMoreElements(); ) {
Rule tdtrule = (Rule) e.nextElement();
if (tdtrule.getType() == ModeList.FORMAT) {
assert seq < tdtrule.getSeq() : "Rule out of sequence order";
seq = tdtrule.getSeq();
processRules(extraparams, tdtrule);
}
}
/**
* Now we need to ensure that all fields required for the outbound grammar are suitably padded
* etc. processPadding takes care of firstly padding the non-binary fields if padChar and
* padDir, length are specified then (if necessary) converting to binary and padding the binary
* representation to the left with zeros if the bit string is has fewer bits than the bitLength
* attribute specifies. N.B. TDTv1.1 will be more specific about bit-level padding rather than
* assuming that it is always to the left with the zero bit.
*/
// System.out.println(" prior to processPadding, " + extraparams);
for (Enumeration e = tdtoutoption.enumerateField(); e.hasMoreElements(); ) {
Field field = (Field) e.nextElement();
// processPadding(extraparams, field, outboundlevel, tdtoutoption);
padField(extraparams, field);
if (outboundlevel == LevelTypeList.BINARY) binaryPadding(extraparams, field);
}
/**
* Construct the output from the specified grammar (in ABNF format) together with the field
* values stored in inputparams
*/
outboundstring = buildGrammar(tdtoutoption.getGrammar(), extraparams);
// System.out.println("final extraparams = " + extraparams);
// System.out.println("returned " + outboundstring);
return outboundstring;
}