spork-master/src/org/apache/pig/impl/io/NullableBag.java
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.pig.impl.io;

import org.apache.pig.data.BagFactory;
import org.apache.pig.data.DataBag;

/**
 *
 */
public class NullableBag extends PigNullableWritable {

    private BagFactory mFactory = null;

    public NullableBag() {
        if (mFactory == null) {
            mFactory = BagFactory.getInstance();
        }
        mValue = mFactory.newDefaultBag();
    }

    /**
     * @param b
     */
    public NullableBag(DataBag b) {
        mValue = b;
    }

    public Object getValueAsPigType() {
        return isNull() ? null : (DataBag)mValue;
    }
}
