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/**
 * 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.columnar;

import java.util.List;

import org.apache.hadoop.hive.serde2.lazy.ByteArrayRef;
import org.apache.hadoop.hive.serde2.lazy.LazyObjectBase;
import org.apache.hadoop.hive.serde2.lazybinary.LazyBinaryFactory;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector.PrimitiveCategory;

public class LazyBinaryColumnarStruct extends ColumnarStructBase {

  public LazyBinaryColumnarStruct(ObjectInspector oi, List notSkippedColumnIDs) {
    super(oi, notSkippedColumnIDs);
  }

  @Override
  protected int getLength(ObjectInspector objectInspector, ByteArrayRef cachedByteArrayRef,
      int start, int length) {
    if (length == 0) {
      return -1;
    }
    Category category = objectInspector.getCategory();
    if (category.equals(Category.PRIMITIVE)) {
      PrimitiveCategory primitiveCategory = ((PrimitiveObjectInspector) objectInspector)
          .getPrimitiveCategory();
      if (primitiveCategory.equals(PrimitiveCategory.STRING) && (length == 1) &&
            (cachedByteArrayRef.getData()[start]
              == LazyBinaryColumnarSerDe.INVALID_UTF__SINGLE_BYTE[0])) {
        return 0;
      }
    }
    return length;
  }

  @Override
  protected LazyObjectBase createLazyObjectBase(ObjectInspector objectInspector) {
    return LazyBinaryFactory.createLazyBinaryObject(objectInspector);
  }
}