package net.sf.saxon.functions;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.om.Item;
import net.sf.saxon.sort.RuleBasedSubstringMatcher;
import net.sf.saxon.sort.StringCollator;
import net.sf.saxon.sort.SubstringMatcher;
import net.sf.saxon.sort.NamedCollation;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.value.AtomicValue;
import net.sf.saxon.value.BooleanValue;
import net.sf.saxon.value.StringValue;
import java.text.RuleBasedCollator;
/**
* This class implements the contains(), starts-with(), ends-with(),
* substring-before(), and substring-after() functions
*/
public class Contains extends CollatingFunction {
public static final int CONTAINS = 0;
public static final int STARTSWITH = 1;
public static final int ENDSWITH = 2;
public static final int AFTER = 3;
public static final int BEFORE = 4;
/**
* Evaluate the function
*/
public Item evaluateItem(XPathContext context) throws XPathException {
StringCollator collator = getCollator(2, context);
AtomicValue arg0 = (AtomicValue)argument[0].evaluateItem(context);
if (arg0==null) {
arg0 = StringValue.EMPTY_STRING;
}
AtomicValue arg1 = (AtomicValue)argument[1].evaluateItem(context);
if (arg1==null) {
arg1 = StringValue.EMPTY_STRING;
};
String s0 = arg0.getStringValue();
String s1 = arg1.getStringValue();
if (collator instanceof NamedCollation &&
((NamedCollation)collator).getCollation() instanceof RuleBasedCollator) {
collator = new RuleBasedSubstringMatcher((RuleBasedCollator)((NamedCollation)collator).getCollation());
}
if (collator instanceof SubstringMatcher) {
switch(operation) {
case CONTAINS:
return BooleanValue.get(((SubstringMatcher)collator).contains(s0, s1));
case STARTSWITH:
return BooleanValue.get(((SubstringMatcher)collator).startsWith(s0, s1));
case ENDSWITH:
return BooleanValue.get(((SubstringMatcher)collator).endsWith(s0, s1));
case AFTER:
return StringValue.makeStringValue(((SubstringMatcher)collator).substringAfter(s0, s1));
case BEFORE:
return StringValue.makeStringValue(((SubstringMatcher)collator).substringBefore(s0, s1));
default:
throw new UnsupportedOperationException("Unknown operation " + operation);
}
} else {
dynamicError("The collation requested for " + getDisplayName() +
" does not support substring matching", "FOCH0004", context);
return null;
}
}
}
//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
// you may not use this file except in compliance with the License. You may obtain a copy of the
// License at http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael H. Kay.
//
// Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
//
// Contributor(s): none.
//