com.pagerduty.mapper.OptionMapping.scala Maven / Gradle / Ivy

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/*
 * Copyright (c) 2015, PagerDuty
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided with
 * the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used to
 * endorse or promote products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.pagerduty.mapper


/**
 * Special mapping that allows to wrap and unwrap Option values.
 */
private[mapper] class OptionMapping(protected val mapping: Mapping)
  extends Mapping
{
  def serializersByColName = mapping.serializersByColName

  def write(targetId: Any, value: Option[Any], mutation: MutationAdapter, ttlSeconds: Option[Int])
  : Unit = value match {
    case Some(v @ Some(_)) => mapping.write(targetId, v, mutation, ttlSeconds)
    case _ => mapping.write(targetId, None, mutation, None)
  }

  def read(targetId: Any, result: ResultAdapter): MappedResult = {
    mapping.read(targetId, result) match {
      case MappedValue(hasColumns, value) if hasColumns => new MappedValue(true, Some(value))
      case _ => new MappedValue(false, None)
    }
  }

  override def toString(): String = s"OptionMapping($mapping)"
}