| /** |
| * 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; |
| |
| /** |
| * LazyObject stores an object in a range of bytes in a byte[]. |
| * |
| * A LazyObject can represent any primitive object or hierarchical object like |
| * array, map or struct. |
| */ |
| public abstract class LazyObject<OI extends ObjectInspector> { |
| |
| OI oi; |
| |
| /** |
| * Create a LazyObject. |
| * |
| * @param oi |
| * Derived classes can access meta information about this Lazy |
| * Object (e.g, separator, nullSequence, escaper) from it. |
| */ |
| protected LazyObject(OI oi) { |
| this.oi = oi; |
| } |
| |
| /** |
| * Set the data for this LazyObject. We take ByteArrayRef instead of byte[] |
| * so that we will be able to drop the reference to byte[] by a single |
| * assignment. The ByteArrayRef object can be reused across multiple rows. |
| * |
| * @param bytes |
| * The wrapper of the byte[]. |
| * @param start |
| * The start position inside the bytes. |
| * @param length |
| * The length of the data, starting from "start" |
| * @see ByteArrayRef |
| */ |
| public abstract void init(byte[] bytes, int start, int length); |
| |
| public abstract void init(IFrameTupleReference tuple); |
| |
| /** |
| * If the LazyObject is a primitive Object, then deserialize it and return |
| * the actual primitive Object. Otherwise (array, map, struct), return this. |
| */ |
| public abstract Object getObject(); |
| |
| @Override |
| public abstract int hashCode(); |
| |
| protected OI getInspector() { |
| return oi; |
| } |
| |
| protected void setInspector(OI oi) { |
| this.oi = oi; |
| } |
| } |