/*
* ToroDB
* Copyright © 2014 8Kdata Technology (www.8kdata.com)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.torodb.core.cursors;
import com.google.common.base.Preconditions;
import java.util.Iterator;
/**
*
*/
public class IteratorCursor<E> implements Cursor<E> {
private boolean closed = false;
private final Iterator<E> iterator;
public IteratorCursor(Iterator<E> iterator) {
this.iterator = iterator;
}
@Override
public void close() {
if (!closed) {
closed = true;
iterator.forEachRemaining(e -> {
});
}
}
@Override
public boolean hasNext() {
Preconditions.checkState(!closed, "The cursor is closed");
return iterator.hasNext();
}
@Override
public E next() {
Preconditions.checkState(!closed, "The cursor is closed");
return iterator.next();
}
}