parquet-hive/parquet-hive-storage-handler/src/main/java/org/apache/hadoop/hive/serde2/objectinspector/primitive/ParquetStringInspector.java

/* 
 * 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.primitive;

import org.apache.hadoop.hive.ql.io.parquet.writable.BinaryWritable;
import org.apache.hadoop.io.Text;

import org.apache.parquet.io.api.Binary;

/**
 * The ParquetStringInspector inspects a BinaryWritable to give a Text or String.
 *
 */
public class ParquetStringInspector extends JavaStringObjectInspector implements SettableStringObjectInspector {

  public ParquetStringInspector() {
    super();
  }

  @Override
  public Text getPrimitiveWritableObject(final Object o) {
    if (o == null) {
      return null;
    }

    if (o instanceof BinaryWritable) {
      return new Text(((BinaryWritable) o).getBytes());
    }

    if (o instanceof Text) {
      return (Text) o;
    }

    if (o instanceof String) {
      return new Text((String) o);
    }

    throw new UnsupportedOperationException("Cannot inspect " + o.getClass().getCanonicalName());
  }

  @Override
  public String getPrimitiveJavaObject(final Object o) {
    if (o == null) {
      return null;
    }

    if (o instanceof BinaryWritable) {
      return ((BinaryWritable) o).getString();
    }

    if (o instanceof Text) {
      return ((Text) o).toString();
    }

    if (o instanceof String) {
      return (String) o;
    }

    throw new UnsupportedOperationException("Cannot inspect " + o.getClass().getCanonicalName());
  }

  @Override
  public Object set(final Object o, final Text text) {
    return new BinaryWritable(text == null ? null : Binary.fromReusedByteArray(text.getBytes
        ()));
  }

  @Override
  public Object set(final Object o, final String string) {
    return new BinaryWritable(string == null ? null : Binary.fromString(string));
  }

  @Override
  public Object create(final Text text) {
    if (text == null) {
      return null;
    }
    return text.toString();
  }

  @Override
  public Object create(final String string) {
    return string;
  }
}