/*
* @(#)$Id: AtomizedSequence.java 3619 2008-03-26 07:23:03Z 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.dm.value.sequence;
import java.util.Iterator;
import xbird.xquery.XQRTException;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.value.*;
import xbird.xquery.meta.DynamicContext;
import xbird.xquery.meta.IFocus;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
* @link http://www.w3.org/TR/xquery/#dt-atomization
*/
public final class AtomizedSequence extends ProxySequence<AtomicValue>
implements IAtomized<AtomicValue> {
private static final long serialVersionUID = 804755669442210560L;
public AtomizedSequence(final Sequence delegate, final DynamicContext dynEnv) {
super(delegate, dynEnv);
}
public boolean next(IFocus focus) throws XQueryException {
final Iterator<? extends Item> delItor = focus.getBaseFocus();
final boolean hasNext = delItor.hasNext();
if(hasNext) {
final Item delItem = delItor.next();
final AtomicValue v = atomize(delItem);
focus.setContextItem(v);
return true;
}
return false;
}
private static AtomicValue atomize(final Item it) {
if(it instanceof AtomicValue) {
return (AtomicValue) it;
} else if(it instanceof XQNode) {
final AtomicValue tv = ((XQNode) it).typedValue();
if(tv == null) {
throw new XQRTException("err:FOTY0012", "Atomization failed with a node has no typed value.");
}
return tv;
} else {
throw new XQRTException("err:XPTY0004", "Atomization failed for type `" + it.getType()
+ '`');
}
}
public static <T extends AtomicValue> IAtomized<T> wrap(Sequence src, DynamicContext dynEnv) {
if(src instanceof IAtomized) {
return (IAtomized<T>) src;
} else {
return (IAtomized<T>) new AtomizedSequence(src, dynEnv);
}
}
}