hivesterix/hivesterix-serde/src/main/java/edu/uci/ics/hivesterix/serde/lazy/LazyPrimitive.java

/*
 * Copyright 2009-2013 by The Regents of the University of California
 * 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 from
 * 
 *     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.
 */
/**
 * 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 edu.uci.ics.hivesterix.serde.lazy;

import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.io.Writable;

import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;

/**
 * LazyPrimitive stores a primitive Object in a LazyObject.
 */
public abstract class LazyPrimitive<OI extends ObjectInspector, T extends Writable> extends LazyObject<OI> {

    LazyPrimitive(OI oi) {
        super(oi);
    }

    LazyPrimitive(LazyPrimitive<OI, T> copy) {
        super(copy.oi);
        isNull = copy.isNull;
    }

    T data;
    boolean isNull = false;

    /**
     * Returns the primitive object represented by this LazyObject. This is
     * useful because it can make sure we have "null" for null objects.
     */
    @Override
    public Object getObject() {
        return isNull ? null : this;
    }

    public T getWritableObject() {
        return isNull ? null : data;
    }

    @Override
    public String toString() {
        return isNull ? "null" : data.toString();
    }

    @Override
    public int hashCode() {
        return isNull ? 0 : data.hashCode();
    }

    @Override
    public void init(IFrameTupleReference tuple) {
    }

}