/** Allocate a Comparator to perform the comparisons described by this sort key component */
public Comparator makeComparator(XPathContext context) throws XPathException {
String orderX = order.evaluateAsString(context);
final Configuration config = context.getConfiguration();
final TypeHierarchy th = config.getTypeHierarchy();
Comparator comp;
if (collation != null) {
comp = collation;
} else if (collationName != null) {
String cname = collationName.evaluateAsString(context);
URI collationURI;
try {
collationURI = new URI(cname);
if (!collationURI.isAbsolute()) {
if (baseURI == null) {
throw new DynamicError("Collation URI is relative, and base URI is unknown");
} else {
URI base = new URI(baseURI);
collationURI = base.resolve(collationURI);
}
}
} catch (URISyntaxException err) {
throw new DynamicError("Collation name " + cname + " is not a valid URI: " + err);
}
try {
comp = context.getCollation(collationURI.toString());
} catch (XPathException e) {
if ("FOCH0002".equals(e.getErrorCodeLocalPart())) {
e.setErrorCode("XTDE1035");
}
throw e;
}
} else {
String caseOrderX = caseOrder.evaluateAsString(context);
String languageX = language.evaluateAsString(context);
Properties props = new Properties();
if (!languageX.equals("")) {
props.setProperty("lang", languageX);
}
if (!caseOrderX.equals("#default")) {
props.setProperty("case-order", caseOrderX);
}
comp = config.getPlatform().makeCollation(config, props);
}
if (dataTypeExpression == null) {
int type = sortKey.getItemType(th).getAtomizedItemType().getPrimitiveType();
comp = AtomicSortComparer.makeSortComparer(comp, type, context);
if (!emptyLeast) {
comp = new EmptyGreatestComparer((AtomicComparer) comp);
}
} else {
String dataType = dataTypeExpression.evaluateAsString(context);
if (dataType.equals("text")) {
comp = new TextComparer(comp);
} else if (dataType.equals("number")) {
comp = NumericComparer.getInstance();
} else {
DynamicError err = new DynamicError("data-type on xsl:sort must be 'text' or 'number'");
err.setErrorCode("XTDE0030");
throw err;
}
}
if (stable != null) {
StringValue stableVal = (StringValue) stable.evaluateItem(context);
String s = stableVal.getStringValue().trim();
if (s.equals("yes") || s.equals("no")) {
// no action
} else {
DynamicError err = new DynamicError("Value of 'stable' on xsl:sort must be 'yes' or 'no'");
err.setErrorCode("XTDE0030");
throw err;
}
}
if (orderX.equals("ascending")) {
return comp;
} else if (orderX.equals("descending")) {
return new DescendingComparer(comp);
} else {
DynamicError err1 = new DynamicError("order must be 'ascending' or 'descending'");
err1.setErrorCode("XTDE0030");
throw err1;
}
}
