org.apache.hadoop.hive.serde2.lazy.LazyObject Maven / Gradle / Ivy
/*
* 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 implements LazyObjectBase {
protected 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;
}
@Override
public abstract int hashCode();
protected OI getInspector() {
return oi;
}
protected void setInspector(OI oi) {
this.oi = oi;
}
protected boolean isNull;
@Override
public void init(ByteArrayRef bytes, int start, int length) {
if (bytes == null) {
throw new RuntimeException("bytes cannot be null!");
}
this.isNull = false;
}
@Override
public void setNull() {
this.isNull = true;
}
/**
* 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;
}
}