NullValue.java

/*
 * Copyright 2015 by Thomas Lottermann
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package notaql.datamodel;

import javax.lang.model.type.NullType;

/**
 * A null value (simply denotes the value being null)
 * @author Thomas Lottermann
 */
public class NullValue extends BaseAtomValue<NullType> {
    private static final long serialVersionUID = -2872085488336896765L;

    public NullValue() {
        super(null);
    }
    public NullValue(ComplexValue<?> parent) {
        super(null, parent);
    }

    @Override
    public Value deepCopy() {
        return new NullValue();
    }

    @Override
    public String toString() {
        return "NULL";
    }
}