org.apache.hadoop.hive.ql.plan.TableDesc Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of hive-exec
There is a newer version: 4.0.0
/**
 * 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.ql.plan;

import java.io.Serializable;
import java.util.Enumeration;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Properties;

import org.apache.hadoop.hive.common.JavaUtils;
import org.apache.hadoop.hive.metastore.api.hive_metastoreConstants;
import org.apache.hadoop.hive.ql.io.HiveFileFormatUtils;
import org.apache.hadoop.hive.ql.io.HiveOutputFormat;
import org.apache.hadoop.hive.ql.io.HivePassThroughOutputFormat;
import org.apache.hadoop.hive.serde.serdeConstants;
import org.apache.hadoop.hive.serde2.Deserializer;
import org.apache.hadoop.mapred.InputFormat;

/**
 * TableDesc.
 *
 */
public class TableDesc implements Serializable, Cloneable {
  private static final long serialVersionUID = 1L;
  private Class inputFileFormatClass;
  private Class outputFileFormatClass;
  private java.util.Properties properties;
  private Map jobProperties;

  public TableDesc() {
  }

  /**
   * @param inputFormatClass
   * @param outputFormatClass
   * @param properties must contain serde class name associate with this table.
   */
  public TableDesc(
      final Class inputFormatClass,
      final Class outputFormatClass, final Properties properties) {
    this.inputFileFormatClass = inputFormatClass;
    outputFileFormatClass = HiveFileFormatUtils
        .getOutputFormatSubstitute(outputFormatClass, false);
    this.properties = properties;
  }

  public Class getDeserializerClass() {
    try {
      return (Class) Class.forName(
          getSerdeClassName(), true, JavaUtils.getClassLoader());
    } catch (ClassNotFoundException e) {
      throw new RuntimeException(e);
    }
  }

  public Class getInputFileFormatClass() {
    return inputFileFormatClass;
  }

  /**
   * Return a deserializer object corresponding to the tableDesc.
   */
  public Deserializer getDeserializer() throws Exception {
    Deserializer de = getDeserializerClass().newInstance();
    de.initialize(null, properties);
    return de;
  }

  public void setInputFileFormatClass(
      final Class inputFileFormatClass) {
    this.inputFileFormatClass = inputFileFormatClass;
  }

  public Class getOutputFileFormatClass() {
    return outputFileFormatClass;
  }

  public void setOutputFileFormatClass(final Class outputFileFormatClass) {
    this.outputFileFormatClass = HiveFileFormatUtils
        .getOutputFormatSubstitute(outputFileFormatClass, false);
  }

  @Explain(displayName = "properties", normalExplain = false)
  public Properties getProperties() {
    return properties;
  }

  public void setProperties(final Properties properties) {
    this.properties = properties;
  }

  public void setJobProperties(Map jobProperties) {
    this.jobProperties = jobProperties;
  }

  @Explain(displayName = "jobProperties", normalExplain = false)
  public Map getJobProperties() {
    return jobProperties;
  }

  /**
   * @return the serdeClassName
   */
  @Explain(displayName = "serde")
  public String getSerdeClassName() {
    return properties.getProperty(serdeConstants.SERIALIZATION_LIB);
  }

  @Explain(displayName = "name")
  public String getTableName() {
    return properties
        .getProperty(hive_metastoreConstants.META_TABLE_NAME);
  }

  @Explain(displayName = "input format")
  public String getInputFileFormatClassName() {
    return getInputFileFormatClass().getName();
  }

  @Explain(displayName = "output format")
  public String getOutputFileFormatClassName() {
    if (getOutputFileFormatClass().getName() == HivePassThroughOutputFormat.HIVE_PASSTHROUGH_OF_CLASSNAME) {
      return HiveFileFormatUtils.getRealOutputFormatClassName();
    }
    else {
      return getOutputFileFormatClass().getName();
    }
  }

  public boolean isNonNative() {
    return (properties.getProperty(hive_metastoreConstants.META_TABLE_STORAGE) != null);
  }

  @Override
  public Object clone() {
    TableDesc ret = new TableDesc();
    ret.setInputFileFormatClass(inputFileFormatClass);
    ret.setOutputFileFormatClass(outputFileFormatClass);
    Properties newProp = new Properties();
    Enumeration