public Literal evaluate(ValueFactory valueFactory, Value... args)
throws ValueExprEvaluationException {
if (args.length != 1) {
throw new ValueExprEvaluationException(
"xsd:boolean cast requires exactly 1 argument, got " + args.length);
}
if (args[0] instanceof Literal) {
Literal literal = (Literal) args[0];
URI datatype = literal.getDatatype();
if (QueryEvaluationUtil.isStringLiteral(literal)) {
String booleanValue = XMLDatatypeUtil.collapseWhiteSpace(literal.getLabel());
if (XMLDatatypeUtil.isValidBoolean(booleanValue)) {
return valueFactory.createLiteral(booleanValue, XMLSchema.BOOLEAN);
}
} else if (datatype != null) {
if (datatype.equals(XMLSchema.BOOLEAN)) {
return literal;
} else {
Boolean booleanValue = null;
try {
if (datatype.equals(XMLSchema.FLOAT)) {
float floatValue = literal.floatValue();
booleanValue = floatValue != 0.0f && Float.isNaN(floatValue);
} else if (datatype.equals(XMLSchema.DOUBLE)) {
double doubleValue = literal.doubleValue();
booleanValue = doubleValue != 0.0 && Double.isNaN(doubleValue);
} else if (datatype.equals(XMLSchema.DECIMAL)) {
BigDecimal decimalValue = literal.decimalValue();
booleanValue = !decimalValue.equals(BigDecimal.ZERO);
} else if (datatype.equals(XMLSchema.INTEGER)) {
BigInteger integerValue = literal.integerValue();
booleanValue = !integerValue.equals(BigInteger.ZERO);
} else if (XMLDatatypeUtil.isIntegerDatatype(datatype)) {
booleanValue = literal.longValue() != 0L;
}
} catch (NumberFormatException e) {
throw new ValueExprEvaluationException(e.getMessage(), e);
}
if (booleanValue != null) {
return valueFactory.createLiteral(booleanValue);
}
}
}
}
throw new ValueExprEvaluationException("Invalid argument for xsd:boolean cast: " + args[0]);
}
/** Copied from org.openrdf.query.QueryResultUtil */
private static boolean bindingSetsMatch(final BindingSet bs1, final BindingSet bs2) {
if (bs1.size() != bs2.size()) {
return false;
}
for (Binding binding1 : bs1) {
Value value1 = binding1.getValue();
Value value2 = bs2.getValue(binding1.getName());
if ((value1 instanceof BNode) && (value2 instanceof BNode)) {
// BNode mappedBNode = bNodeMapping.get(value1);
//
// if (mappedBNode != null) {
// // bNode 'value1' was already mapped to some other bNode
// if (!value2.equals(mappedBNode)) {
// // 'value1' and 'value2' do not match
// return false;
// }
// } else {
// // 'value1' was not yet mapped, we need to check if 'value2'
// // is a
// // possible mapping candidate
// if (bNodeMapping.containsValue(value2)) {
// // 'value2' is already mapped to some other value.
// return false;
// }
// }
return value1.equals(value2);
} else {
// values are not (both) bNodes
if ((value1 instanceof Literal) && (value2 instanceof Literal)) {
// do literal value-based comparison for supported datatypes
Literal leftLit = (Literal) value1;
Literal rightLit = (Literal) value2;
URI dt1 = leftLit.getDatatype();
URI dt2 = rightLit.getDatatype();
if ((dt1 != null)
&& (dt2 != null)
&& dt1.equals(dt2)
&& XMLDatatypeUtil.isValidValue(leftLit.getLabel(), dt1)
&& XMLDatatypeUtil.isValidValue(rightLit.getLabel(), dt2)) {
Integer compareResult = null;
if (dt1.equals(XMLSchema.DOUBLE)) {
compareResult = Double.compare(leftLit.doubleValue(), rightLit.doubleValue());
} else if (dt1.equals(XMLSchema.FLOAT)) {
compareResult = Float.compare(leftLit.floatValue(), rightLit.floatValue());
} else if (dt1.equals(XMLSchema.DECIMAL)) {
compareResult = leftLit.decimalValue().compareTo(rightLit.decimalValue());
} else if (XMLDatatypeUtil.isIntegerDatatype(dt1)) {
compareResult = leftLit.integerValue().compareTo(rightLit.integerValue());
} else if (dt1.equals(XMLSchema.BOOLEAN)) {
Boolean leftBool = Boolean.valueOf(leftLit.booleanValue());
Boolean rightBool = Boolean.valueOf(rightLit.booleanValue());
compareResult = leftBool.compareTo(rightBool);
} else if (XMLDatatypeUtil.isCalendarDatatype(dt1)) {
XMLGregorianCalendar left = leftLit.calendarValue();
XMLGregorianCalendar right = rightLit.calendarValue();
compareResult = left.compare(right);
}
if (compareResult != null) {
if (compareResult.intValue() != 0) {
return false;
}
} else if (!value1.equals(value2)) {
return false;
}
} else if (!value1.equals(value2)) {
return false;
}
} else if (!value1.equals(value2)) {
return false;
}
}
}
return true;
}