org.apache.hadoop.hive.serde2.objectinspector.DelegatedObjectInspectorFactory 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.objectinspector;

public class DelegatedObjectInspectorFactory {

  public static ObjectInspector wrap(ObjectInspector inspector) {
    switch (inspector.getCategory()) {
      case PRIMITIVE:
        return inspector;
      case LIST:
        return new DelegatedListObjectInspector((ListObjectInspector) inspector);
      case MAP:
        return new DelegatedMapObjectInspector((MapObjectInspector) inspector);
      case STRUCT:
        return new DelegatedStructObjectInspector((StructObjectInspector) inspector);
      case UNION:
        return new DelegatedUnionObjectInspector((UnionObjectInspector) inspector);
      default:
        throw new RuntimeException("invalid category " + inspector.getCategory());
    }
  }

  public static ObjectInspector reset(ObjectInspector prev, ObjectInspector current) {
    switch (current.getCategory()) {
      case PRIMITIVE:
        break;
      case LIST:
        ((DelegatedListObjectInspector)prev).reset((ListObjectInspector) current);
        break;
      case MAP:
        ((DelegatedMapObjectInspector)prev).reset((MapObjectInspector) current);
        break;
      case STRUCT:
        ((DelegatedStructObjectInspector)prev).reset((StructObjectInspector) current);
        break;
      case UNION:
        ((DelegatedUnionObjectInspector)prev).reset((UnionObjectInspector) current);
        break;
      default:
        throw new RuntimeException("invalid category " + current.getCategory());
    }
    return prev;
  }
}