/**
* 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.lazybinary.objectinspector;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
/**
* ObjectInspectorFactory is the primary way to create new ObjectInspector
* instances.
*
* SerDe classes should call the static functions in this library to create an
* ObjectInspector to return to the caller of SerDe2.getObjectInspector().
*
* The reason of having caches here is that ObjectInspectors do not have an
* internal state - so ObjectInspectors with the same construction parameters
* should result in exactly the same ObjectInspector.
*/
public final class LazyBinaryObjectInspectorFactory {
static ConcurrentHashMap<ArrayList<Object>, LazyBinaryStructObjectInspector> cachedLazyBinaryStructObjectInspector =
new ConcurrentHashMap<ArrayList<Object>, LazyBinaryStructObjectInspector>();
static ConcurrentHashMap<ArrayList<Object>, LazyBinaryUnionObjectInspector> cachedLazyBinaryUnionObjectInspector =
new ConcurrentHashMap<ArrayList<Object>, LazyBinaryUnionObjectInspector>();
public static LazyBinaryStructObjectInspector getLazyBinaryStructObjectInspector(
List<String> structFieldNames,
List<ObjectInspector> structFieldObjectInspectors) {
return getLazyBinaryStructObjectInspector(structFieldNames,
structFieldObjectInspectors, null);
}
public static LazyBinaryStructObjectInspector getLazyBinaryStructObjectInspector(
List<String> structFieldNames,
List<ObjectInspector> structFieldObjectInspectors, List<String> structFieldComments) {
ArrayList<Object> signature = new ArrayList<Object>(3);
signature.add(structFieldNames);
signature.add(structFieldObjectInspectors);
if(structFieldComments != null) {
signature.add(structFieldComments);
}
LazyBinaryStructObjectInspector result = cachedLazyBinaryStructObjectInspector
.get(signature);
if (result == null) {
result = new LazyBinaryStructObjectInspector(structFieldNames,
structFieldObjectInspectors, structFieldComments);
LazyBinaryStructObjectInspector prev =
cachedLazyBinaryStructObjectInspector.putIfAbsent(signature, result);
if (prev != null) {
result = prev;
}
}
return result;
}
public static LazyBinaryUnionObjectInspector getLazyBinaryUnionObjectInspector(
List<ObjectInspector> unionFieldObjectInspectors) {
ArrayList<Object> signature = new ArrayList<Object>(1);
signature.add(unionFieldObjectInspectors);
LazyBinaryUnionObjectInspector result = cachedLazyBinaryUnionObjectInspector
.get(signature);
if (result == null) {
result = new LazyBinaryUnionObjectInspector(unionFieldObjectInspectors);
LazyBinaryUnionObjectInspector prev =
cachedLazyBinaryUnionObjectInspector.putIfAbsent(signature, result);
if (prev != null) {
result = prev;
}
}
return result;
}
static ConcurrentHashMap<ArrayList<Object>, LazyBinaryListObjectInspector> cachedLazyBinaryListObjectInspector =
new ConcurrentHashMap<ArrayList<Object>, LazyBinaryListObjectInspector>();
public static LazyBinaryListObjectInspector getLazyBinaryListObjectInspector(
ObjectInspector listElementObjectInspector) {
ArrayList<Object> signature = new ArrayList<Object>();
signature.add(listElementObjectInspector);
LazyBinaryListObjectInspector result = cachedLazyBinaryListObjectInspector
.get(signature);
if (result == null) {
result = new LazyBinaryListObjectInspector(listElementObjectInspector);
LazyBinaryListObjectInspector prev =
cachedLazyBinaryListObjectInspector.putIfAbsent(signature, result);
if (prev != null) {
result = prev;
}
}
return result;
}
static ConcurrentHashMap<ArrayList<Object>, LazyBinaryMapObjectInspector> cachedLazyBinaryMapObjectInspector =
new ConcurrentHashMap<ArrayList<Object>, LazyBinaryMapObjectInspector>();
public static LazyBinaryMapObjectInspector getLazyBinaryMapObjectInspector(
ObjectInspector mapKeyObjectInspector,
ObjectInspector mapValueObjectInspector) {
ArrayList<Object> signature = new ArrayList<Object>();
signature.add(mapKeyObjectInspector);
signature.add(mapValueObjectInspector);
LazyBinaryMapObjectInspector result = cachedLazyBinaryMapObjectInspector
.get(signature);
if (result == null) {
result = new LazyBinaryMapObjectInspector(mapKeyObjectInspector,
mapValueObjectInspector);
LazyBinaryMapObjectInspector prev =
cachedLazyBinaryMapObjectInspector.putIfAbsent(signature, result);
if (prev != null) {
result = prev;
}
}
return result;
}
private LazyBinaryObjectInspectorFactory() {
// prevent instantiation
}
}