SnapShotQueryResult.java

/* This file is part of the db4o object database http://www.db4o.com

Copyright (C) 2004 - 2011  Versant Corporation http://www.versant.com

db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.

db4o 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 General Public License
for more details.

You should have received a copy of the GNU General Public License along
with this program.  If not, see http://www.gnu.org/licenses/. */
package com.db4o.internal.query.result;

import com.db4o.foundation.*;
import com.db4o.internal.*;
import com.db4o.internal.query.processor.*;


/**
 * @exclude
 */
public class SnapShotQueryResult extends AbstractLateQueryResult {
	
	public SnapShotQueryResult(Transaction transaction) {
		super(transaction);
	}
	
	public void loadFromClassIndex(final ClassMetadata clazz) {
		createSnapshot(classIndexIterable(clazz)); 
	}

	public void loadFromClassIndexes(final ClassMetadataIterator classCollectionIterator) {
		createSnapshot(classIndexesIterable(classCollectionIterator));
	}
	
	public void loadFromQuery(final QQuery query) {
		final Iterator4 _iterator = query.executeSnapshot();
		_iterable = new Iterable4() {
			public Iterator4 iterator() {
				_iterator.reset();
				return _iterator;
			}
		}; 
	}
	
	private void createSnapshot(Iterable4 iterable) {
		final Tree ids = TreeInt.addAll(null, new IntIterator4Adaptor(iterable));
		_iterable = new Iterable4() {
			public Iterator4 iterator() {
				return new TreeKeyIterator(ids);
			}
		
		};
	}

}