fullstack/hivesterix/hivesterix-serde/src/main/java/edu/uci/ics/hivesterix/serde/lazy/LazyNonPrimitive.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 edu.uci.ics.hivesterix.serde.lazy;

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

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

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

    protected byte[] bytes;
    protected int start;
    protected int length;

    /**
     * Create a LazyNonPrimitive object with the specified ObjectInspector.
     * 
     * @param oi
     *            The ObjectInspector would have to have a hierarchy of
     *            LazyObjectInspectors with the leaf nodes being
     *            WritableObjectInspectors. It's used both for accessing the
     *            type hierarchy of the complex object, as well as getting meta
     *            information (separator, nullSequence, etc) when parsing the
     *            lazy object.
     */
    protected LazyNonPrimitive(OI oi) {
        super(oi);
        bytes = null;
        start = 0;
        length = 0;
    }

    @Override
    public void init(byte[] bytes, int start, int length) {
        if (bytes == null) {
            throw new RuntimeException("bytes cannot be null!");
        }
        this.bytes = bytes;
        this.start = start;
        this.length = length;
        assert start >= 0;
        assert start + length <= bytes.length;
    }

    @Override
    public Object getObject() {
        return this;
    }

    @Override
    public int hashCode() {
        return LazyUtils.hashBytes(bytes, start, length);
    }

    @Override
    public void init(IFrameTupleReference tuple) {
    }

}