All Downloads are FREE. Search and download functionalities are using the official Maven repository.

org.apache.hadoop.hive.serde2.lazybinary.objectinspector.LazyBinaryObjectInspectorFactory Maven / Gradle / Ivy

Go to download

There is a newer version: 4.0.0
Show newest version
/**
 * 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, LazyBinaryStructObjectInspector> cachedLazyBinaryStructObjectInspector =
      new ConcurrentHashMap, LazyBinaryStructObjectInspector>();

  public static LazyBinaryStructObjectInspector getLazyBinaryStructObjectInspector(
      List structFieldNames,
      List structFieldObjectInspectors) {
    return getLazyBinaryStructObjectInspector(structFieldNames,
                                              structFieldObjectInspectors, null);
  }

  public static LazyBinaryStructObjectInspector getLazyBinaryStructObjectInspector(
      List structFieldNames,
      List structFieldObjectInspectors, List structFieldComments) {
    ArrayList signature = new ArrayList(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);
      cachedLazyBinaryStructObjectInspector.put(signature, result);
    }
    return result;
  }

  static ConcurrentHashMap, LazyBinaryListObjectInspector> cachedLazyBinaryListObjectInspector =
      new ConcurrentHashMap, LazyBinaryListObjectInspector>();

  public static LazyBinaryListObjectInspector getLazyBinaryListObjectInspector(
      ObjectInspector listElementObjectInspector) {
    ArrayList signature = new ArrayList();
    signature.add(listElementObjectInspector);
    LazyBinaryListObjectInspector result = cachedLazyBinaryListObjectInspector
        .get(signature);
    if (result == null) {
      result = new LazyBinaryListObjectInspector(listElementObjectInspector);
      cachedLazyBinaryListObjectInspector.put(signature, result);
    }
    return result;
  }

  static ConcurrentHashMap, LazyBinaryMapObjectInspector> cachedLazyBinaryMapObjectInspector =
      new ConcurrentHashMap, LazyBinaryMapObjectInspector>();

  public static LazyBinaryMapObjectInspector getLazyBinaryMapObjectInspector(
      ObjectInspector mapKeyObjectInspector,
      ObjectInspector mapValueObjectInspector) {
    ArrayList signature = new ArrayList();
    signature.add(mapKeyObjectInspector);
    signature.add(mapValueObjectInspector);
    LazyBinaryMapObjectInspector result = cachedLazyBinaryMapObjectInspector
        .get(signature);
    if (result == null) {
      result = new LazyBinaryMapObjectInspector(mapKeyObjectInspector,
          mapValueObjectInspector);
      cachedLazyBinaryMapObjectInspector.put(signature, result);
    }
    return result;
  }

  private LazyBinaryObjectInspectorFactory() {
    // prevent instantiation
  }
}
 















© 2015 - 2024 Weber Informatics LLC | Privacy Policy