package client.net.sf.saxon.ce.functions;
import client.net.sf.saxon.ce.expr.ArithmeticExpression;
import client.net.sf.saxon.ce.expr.Atomizer;
import client.net.sf.saxon.ce.expr.Calculator;
import client.net.sf.saxon.ce.expr.XPathContext;
import client.net.sf.saxon.ce.om.Item;
import client.net.sf.saxon.ce.om.SequenceIterator;
import client.net.sf.saxon.ce.trans.XPathException;
import client.net.sf.saxon.ce.tree.util.SourceLocator;
import client.net.sf.saxon.ce.type.BuiltInAtomicType;
import client.net.sf.saxon.ce.type.ItemType;
import client.net.sf.saxon.ce.type.Type;
import client.net.sf.saxon.ce.type.TypeHierarchy;
import client.net.sf.saxon.ce.value.*;
/**
* Implementation of the fn:sum function
*/
public class Sum extends Aggregate {
public Sum newInstance() {
return new Sum();
}
public ItemType getItemType(TypeHierarchy th) {
ItemType base = Atomizer.getAtomizedItemType(argument[0], false, th);
if (base.equals(BuiltInAtomicType.UNTYPED_ATOMIC)) {
base = BuiltInAtomicType.DOUBLE;
}
if (Cardinality.allowsZero(argument[0].getCardinality())) {
if (argument.length == 1) {
return Type.getCommonSuperType(base, BuiltInAtomicType.INTEGER, th);
} else {
return Type.getCommonSuperType(base, argument[1].getItemType(th), th);
}
} else {
return base;
}
}
/**
* Evaluate the function
*/
public Item evaluateItem(XPathContext context) throws XPathException {
AtomicValue sum = total(argument[0].iterate(context), context, getSourceLocator());
if (sum != null) {
return sum;
} else {
// the sequence was empty
if (argument.length == 2) {
return argument[1].evaluateItem(context);
} else {
return IntegerValue.ZERO;
}
}
}
/**
* Calculate the total of a sequence.
* @param iter iterator over the items to be totalled
* @param context the XPath dynamic context
* @param location location of the expression in the source for diagnostics
* @return the total, according to the rules of the XPath sum() function, but returning null
* if the sequence is empty. (It's then up to the caller to decide what the correct result is
* for an empty sequence.
*/
public static AtomicValue total(SequenceIterator iter, XPathContext context, SourceLocator location)
throws XPathException {
AtomicValue sum = (AtomicValue)iter.next();
if (sum == null) {
// the sequence is empty
return null;
}
if (sum instanceof UntypedAtomicValue) {
try {
sum = sum.convert(BuiltInAtomicType.DOUBLE, true).asAtomic();
} catch (XPathException e) {
e.maybeSetLocation(location);
throw e;
}
}
if (sum instanceof NumericValue) {
while (true) {
AtomicValue next = (AtomicValue)iter.next();
if (next == null) {
return sum;
}
if (next instanceof UntypedAtomicValue) {
next = next.convert(BuiltInAtomicType.DOUBLE, true).asAtomic();
} else if (!(next instanceof NumericValue)) {
XPathException err = new XPathException("Input to sum() contains a mix of numeric and non-numeric values");
err.setXPathContext(context);
err.setErrorCode("FORG0006");
err.setLocator(location);
throw err;
}
//sum = ((NumericValue)sum).arithmetic(Token.PLUS, (NumericValue)next, context);
sum = ArithmeticExpression.compute(sum, Calculator.PLUS, next, context);
if (sum.isNaN() && sum instanceof DoubleValue) {
// take an early bath, once we've got a double NaN it's not going to change
return sum;
}
}
} else if (sum instanceof DurationValue) {
if (!((sum instanceof DayTimeDurationValue) || (sum instanceof YearMonthDurationValue))) {
XPathException err = new XPathException("Input to sum() contains a duration that is neither a dayTimeDuration nor a yearMonthDuration");
err.setXPathContext(context);
err.setErrorCode("FORG0006");
err.setLocator(location);
throw err;
}
while (true) {
AtomicValue next = (AtomicValue)iter.next();
if (next == null) {
return sum;
}
if (!(next instanceof DurationValue)) {
XPathException err = new XPathException("Input to sum() contains a mix of duration and non-duration values");
err.setXPathContext(context);
err.setErrorCode("FORG0006");
err.setLocator(location);
throw err;
}
sum = ((DurationValue)sum).add((DurationValue)next);
}
} else {
XPathException err = new XPathException(
"Input to sum() contains a value of type " +
sum.getPrimitiveType().getDisplayName() +
" which is neither numeric, nor a duration");
err.setXPathContext(context);
err.setErrorCode("FORG0006");
err.setLocator(location);
throw err;
}
}
}
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is “Incompatible With Secondary Licenses”, as defined by the Mozilla Public License, v. 2.0.