/tags/release-0.1-rc2/hive/external/serde/src/java/org/apache/hadoop/hive/serde2/lazy/LazyObject.java
Java | 74 lines | 18 code | 9 blank | 47 comment | 0 complexity | 411d1e8a70ba72ea8893f3d4da680396 MD5 | raw file
Possible License(s): Apache-2.0, BSD-3-Clause, JSON, CPL-1.0
- /**
- * 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.serde2.lazy;
- import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
- /**
- * 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(ByteArrayRef bytes, int start, int length);
- /**
- * 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;
- }
- }