exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/scan/convert/ConvertStringToTime.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.drill.exec.physical.impl.scan.convert;

import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.Map;

import org.apache.drill.exec.vector.accessor.InvalidConversionError;
import org.apache.drill.exec.vector.accessor.ScalarWriter;

/**
 * Convert a VARCHAR column to an TIME column following the Java rules
 * for parsing a date time, optionally using the formatter provided in
 * the column schema.
 */
public class ConvertStringToTime extends AbstractConvertFromString {

  private final DateTimeFormatter dateTimeFormatter;

  public ConvertStringToTime(ScalarWriter baseWriter,
      Map<String, String> properties) {
    super(baseWriter, properties);
    dateTimeFormatter = baseWriter.schema().dateTimeFormatter();
  }

  @Override
  public void setString(final String value) {
    final String prepared = prepare.apply(value);
    if (prepared == null) {
      return;
    }
    try {
      baseWriter.setTime(LocalTime.parse(prepared, dateTimeFormatter));
    }
    catch (final Exception e) {
      throw InvalidConversionError.writeError(schema(), value, e);
    }
  }
}