/*
* @(#)$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.sequence.ChainedSequence;
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.SequenceType;
import xbird.xquery.type.Type;
/**
* ext:union-all($first as item()*, $sec as item()*) as item()*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public final class UnionAll extends BuiltInFunction {
private static final long serialVersionUID = 6651349606315469208L;
public static final String SYMBOL = EXT_NSPREFIX + ":union-all";
public UnionAll() {
super(SYMBOL, SequenceType.ANY_ITEMS);
}
@Override
protected FunctionSignature[] signatures() {
final FunctionSignature[] s = new FunctionSignature[1];
s[0] = new FunctionSignature(getName(), new Type[] { SequenceType.ANY_ITEMS,
SequenceType.ANY_ITEMS });
return s;
}
public ChainedSequence eval(Sequence<? extends Item> contextSeq, ValueSequence argv, DynamicContext dynEnv)
throws XQueryException {
Item firstItem = argv.getItem(0);
Item secItem = argv.getItem(1);
return new ChainedSequence(firstItem, secItem, dynEnv);
}
public static Sequence unionAll(final DynamicContext dynEnv, final Sequence... sequences) {
final int size = sequences.length;
if(size == 0) {
return ValueSequence.EMPTY_SEQUENCE;
} else if(size == 1) {
return sequences[0];
}
ChainedSequence piped = new ChainedSequence(sequences[0], sequences[1], dynEnv);
for(int i = 2; i < size; i++) {
piped = new ChainedSequence(piped, sequences[i], dynEnv);
}
return piped;
}
}