org.apache.hadoop.hive.serde2.lazy.LazyNonPrimitive 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;
import org.apache.hadoop.io.Text;
/**
* LazyPrimitive stores a primitive Object in a LazyObject.
*/
public abstract class LazyNonPrimitive extends
LazyObject {
protected ByteArrayRef 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(ByteArrayRef bytes, int start, int length) {
super.init(bytes, start, length);
this.bytes = bytes;
this.start = start;
this.length = length;
assert start >= 0;
assert start + length <= bytes.getData().length;
}
protected final boolean isNull(
Text nullSequence, ByteArrayRef ref, int fieldByteBegin, int fieldLength) {
return ref == null || isNull(nullSequence, ref.getData(), fieldByteBegin, fieldLength);
}
protected final boolean isNull(
Text nullSequence, byte[] bytes, int fieldByteBegin, int fieldLength) {
// Test the length first so in most cases we avoid doing a byte[]
// comparison.
return fieldLength < 0 || (fieldLength == nullSequence.getLength() &&
LazyUtils.compare(bytes, fieldByteBegin, fieldLength,
nullSequence.getBytes(), 0, nullSequence.getLength()) == 0);
}
@Override
public int hashCode() {
return LazyUtils.hashBytes(bytes.getData(), start, length);
}
}