/**
* Copyright 2004-2016 Riccardo Solmi. All rights reserved.
* This file is part of the Whole Platform.
*
* The Whole Platform is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The Whole Platform is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the Whole Platform. If not, see <http://www.gnu.org/licenses/>.
*/
package org.whole.lang.queries.iterators;
import org.whole.lang.bindings.BindingManagerFactory;
import org.whole.lang.iterators.IEntityIterator;
import org.whole.lang.model.IEntity;
import org.whole.lang.reflect.EntityDescriptor;
import org.whole.lang.util.EntityUtils;
/**
* @author Riccardo Solmi
*/
public class PointwiseInsertIterator<E extends IEntity> extends AbstractPointwiseIterator<E> {
protected Placement placement;
protected PointwiseInsertIterator(IEntityIterator<E> valuesIterator, IEntityIterator<? super E> toIterator, Placement placement) {
super(valuesIterator, toIterator);
this.placement = placement;
}
@SuppressWarnings("unchecked")
protected E doLookahead(IEntity toLookahead, E nextEntity) {
EntityDescriptor<?> toEd;
switch (placement) {
case BEFORE:
toEd = toLookahead.wGetParent().wGetEntityDescriptor(toLookahead);
break;
case INTO:
//TODO workaround for Resolver ED
if (EntityUtils.isResolver(toLookahead))
toEd = toLookahead.wGetParent().wGetEntityDescriptor(toLookahead).getEntityDescriptor(0);
else
toEd = toLookahead.wGetEntityDescriptor(0);
break;
default:
throw new IllegalArgumentException("unsupported placement");
}
return (E) EntityUtils.convertCloneIfParented(nextEntity, toEd);
}
protected void doNext(IEntity toEntity, E nextEntity) {
if (BindingManagerFactory.instance.isVoid(nextEntity))
return;
switch (placement) {
case BEFORE:
toIterator.add(nextEntity);
break;
case INTO:
toEntity.wAdd(nextEntity);
break;
}
}
@Override
public void toString(StringBuilder sb) {
sb.append("insert");
sb.append(placement);
sb.append("(");
sb.append(toIterator.toString());
sb.append(" .= ");
super.toString(sb);
sb.append(")");
}
}