package client.net.sf.saxon.ce.functions;
import client.net.sf.saxon.ce.expr.XPathContext;
import client.net.sf.saxon.ce.expr.sort.CodepointCollator;
import client.net.sf.saxon.ce.om.Item;
import client.net.sf.saxon.ce.trans.XPathException;
import client.net.sf.saxon.ce.value.StringValue;
/**
* Implements the fn:substring-after() function
*/
public class SubstringAfter extends CollatingFunction {
public SubstringAfter newInstance() {
return new SubstringAfter();
}
/**
* Evaluate the function
*/
public Item evaluateItem(XPathContext context) throws XPathException {
StringValue arg1 = (StringValue)argument[0].evaluateItem(context);
StringValue arg2 = (StringValue)argument[1].evaluateItem(context);
if (arg1 == null) {
arg1 = StringValue.EMPTY_STRING;
}
if (arg2 == null) {
arg2 = StringValue.EMPTY_STRING;
}
if (arg2.isZeroLength()) {
return arg1;
}
if (arg1.isZeroLength()) {
return StringValue.EMPTY_STRING;
}
String s1 = arg1.getStringValue();
String s2 = arg2.getStringValue();
String result = null;
if (stringCollator instanceof CodepointCollator) {
// fast path for this common case
int i = s1.indexOf(s2);
if (i < 0) {
result = "";
} else {
result = s1.substring(i + s2.length());
}
} else {
doesNotSupportSubstringMatching(context);
}
StringValue s = StringValue.makeStringValue(result);
if (arg1.isKnownToContainNoSurrogates()) {
s.setContainsNoSurrogates();
}
return s;
}
}
// 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.