com.torodb.core.cursors.EmptyCursor.java Source code

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Here is the source code for com.torodb.core.cursors.EmptyCursor.java

Source

/*
 * 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.NoSuchElementException;

/**
 *
 */
public class EmptyCursor<E> implements Cursor<E> {

    private boolean closed = false;

    @Override
    public void close() {
        closed = true;
    }

    @Override
    public boolean hasNext() {
        Preconditions.checkState(!closed);
        return false;
    }

    @Override
    public E next() {
        Preconditions.checkState(!closed);
        throw new NoSuchElementException();
    }

}