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HIVE-6148 - Support arbitrary structs stored in HBase (Swarnim Kulkar…
…ni via Brock) git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1628502 13f79535-47bb-0310-9956-ffa450edef68
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Brock Noland
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Sep 30, 2014
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hbase-handler/src/java/org/apache/hadoop/hive/hbase/struct/HBaseStructValue.java
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| /** | ||
| * 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.hadoop.hive.hbase.struct; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
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| import org.apache.hadoop.hive.serde2.lazy.ByteArrayRef; | ||
| import org.apache.hadoop.hive.serde2.lazy.LazyFactory; | ||
| import org.apache.hadoop.hive.serde2.lazy.LazyObject; | ||
| import org.apache.hadoop.hive.serde2.lazy.LazyStruct; | ||
| import org.apache.hadoop.hive.serde2.lazy.objectinspector.LazySimpleStructObjectInspector; | ||
| import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector; | ||
| import org.apache.hadoop.hive.serde2.objectinspector.StructField; | ||
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| /** | ||
| * This is an extension of LazyStruct. All value structs should extend this class and override the | ||
| * {@link LazyStruct#getField(int)} method where fieldID corresponds to the ID of a value in the | ||
| * value structure. | ||
| * <p> | ||
| * For example, for a value structure <i>"/part1/part2/part3"</i>, <i>part1</i> will have an id | ||
| * <i>0</i>, <i>part2</i> will have an id <i>1</i> and <i>part3</i> will have an id <i>2</i>. Custom | ||
| * implementations of getField(fieldID) should return the value corresponding to that fieldID. So, | ||
| * for the above example, the value returned for <i>getField(0)</i> should be </i>part1</i>, | ||
| * <i>getField(1)</i> should be <i>part2</i> and <i>getField(2)</i> should be <i>part3</i>. | ||
| * </p> | ||
| * <p> | ||
| * All implementation are expected to have a constructor of the form <br> | ||
| * | ||
| * <pre> | ||
| * MyCustomStructObject(LazySimpleStructObjectInspector oi, Properties props, Configuration conf, ColumnMapping colMap) | ||
| * </pre> | ||
| * | ||
| * </p> | ||
| * */ | ||
| public class HBaseStructValue extends LazyStruct { | ||
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| /** | ||
| * The column family name | ||
| */ | ||
| protected String familyName; | ||
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| /** | ||
| * The column qualifier name | ||
| */ | ||
| protected String qualifierName; | ||
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| public HBaseStructValue(LazySimpleStructObjectInspector oi) { | ||
| super(oi); | ||
| } | ||
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| /** | ||
| * Set the row data for this LazyStruct. | ||
| * | ||
| * @see LazyObject#init(ByteArrayRef, int, int) | ||
| * | ||
| * @param familyName The column family name | ||
| * @param qualifierName The column qualifier name | ||
| */ | ||
| public void init(ByteArrayRef bytes, int start, int length, String familyName, | ||
| String qualifierName) { | ||
| init(bytes, start, length); | ||
| this.familyName = familyName; | ||
| this.qualifierName = qualifierName; | ||
| } | ||
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| @Override | ||
| public ArrayList<Object> getFieldsAsList() { | ||
| ArrayList<Object> allFields = new ArrayList<Object>(); | ||
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| List<? extends StructField> fields = oi.getAllStructFieldRefs(); | ||
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| for (int i = 0; i < fields.size(); i++) { | ||
| allFields.add(getField(i)); | ||
| } | ||
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| return allFields; | ||
| } | ||
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| /** | ||
| * Create an initialize a {@link LazyObject} with the given bytes for the given fieldID. | ||
| * | ||
| * @param fieldID field for which the object is to be created | ||
| * @param bytes value with which the object is to be initialized with | ||
| * @return initialized {@link LazyObject} | ||
| * */ | ||
| public LazyObject<? extends ObjectInspector> toLazyObject(int fieldID, byte[] bytes) { | ||
| ObjectInspector fieldOI = oi.getAllStructFieldRefs().get(fieldID).getFieldObjectInspector(); | ||
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| LazyObject<? extends ObjectInspector> lazyObject = LazyFactory.createLazyObject(fieldOI); | ||
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| ByteArrayRef ref = new ByteArrayRef(); | ||
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| ref.setData(bytes); | ||
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| // initialize the lazy object | ||
| lazyObject.init(ref, 0, ref.getData().length); | ||
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| return lazyObject; | ||
| } | ||
| } |
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