/*
* @(#)$Id: codetemplate_xbird.xml 943 2006-09-13 07:03:37Z yui $
*
* Copyright 2006-2008 Makoto YUI
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.xquery.func.ext;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.value.Item;
import xbird.xquery.dm.value.Sequence;
import xbird.xquery.dm.value.literal.XInteger;
import xbird.xquery.dm.value.sequence.ValueSequence;
import xbird.xquery.func.BuiltInFunction;
import xbird.xquery.func.FunctionSignature;
import xbird.xquery.meta.DynamicContext;
import xbird.xquery.type.ItemType;
import xbird.xquery.type.Type;
import xbird.xquery.type.xs.IntegerType;
/**
* ext:hash(str as item()) as xs:integer
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public final class StrHash extends BuiltInFunction {
private static final long serialVersionUID = -4768899596763147042L;
public static final String SYMBOL = EXT_NSPREFIX + ":hash";
public StrHash() {
super(SYMBOL, IntegerType.INTEGER);
}
@Override
protected FunctionSignature[] signatures() {
return new FunctionSignature[] { new FunctionSignature(getName(), new Type[] { ItemType.ANY_ITEM }) };
}
public Sequence eval(Sequence<? extends Item> contextSeq, ValueSequence argv, DynamicContext dynEnv)
throws XQueryException {
Item firstItem = argv.getItem(0);
String str = firstItem.stringValue();
int hashvalue = str.hashCode();
return new XInteger(hashvalue);
}
}