/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.query.processor;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import org.teiid.common.buffer.TupleSource;
import org.teiid.core.TeiidComponentException;
import org.teiid.core.TeiidProcessingException;
public class CollectionTupleSource implements TupleSource {
public static final List<Integer> UPDATE_ROW = Arrays.asList(1);
private Iterator<? extends List<?>> tuples;
public static CollectionTupleSource createUpdateCountTupleSource(int count) {
return new CollectionTupleSource(Arrays.asList(Arrays.asList(count)).iterator());
}
public static TupleSource createUpdateCountArrayTupleSource(final long count) {
return new TupleSource() {
long index = 0;
@Override
public List<?> nextTuple() throws TeiidComponentException,
TeiidProcessingException {
if (index++ < count) {
return UPDATE_ROW;
}
return null;
}
@Override
public void closeSource() {
}
};
}
public static CollectionTupleSource createNullTupleSource() {
return new CollectionTupleSource(new ArrayList<List<Object>>(0).iterator());
}
public CollectionTupleSource(Iterator<? extends List<?>> tuples) {
this.tuples = tuples;
}
@Override
public List<?> nextTuple() {
if (tuples.hasNext()) {
return tuples.next();
}
return null;
}
@Override
public void closeSource() {
}
}