net.caladesiframework.neo4j.relation.OptionalRelatedToOne.scala Maven / Gradle / Ivy

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/*
 * Copyright 2012 Caladesi Framework
 *
 * Licensed 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 net.caladesiframework.neo4j.relation

import net.caladesiframework.neo4j.graph.entity.Neo4jGraphEntity
import net.caladesiframework.neo4j.field.Field
import net.caladesiframework.neo4j.entity.Entity

class OptionalRelatedToOne[EntityType <: Neo4jGraphEntity](implicit m:Manifest[EntityType])
  extends Field[Option[EntityType]] with Relation {

  override lazy val defaultValue : Option[EntityType] = None

  override val optional = true

  /**
   * Init the field with default value
   *
   * @param ownerEntity
   */
  def this(ownerEntity: Entity, relation: String)(implicit m:Manifest[EntityType]) = {
    this()
    owner = ownerEntity
    set(defaultValue)
    RELATION_NAME = relation
  }

  /**
   * Set the field with value
   *
   * @param ownerEntity
   * @param value
   */
  def this(ownerEntity: Entity, value: EntityType, relation: String)(implicit m:Manifest[EntityType]) = {
    this()
    owner = ownerEntity
    set(Some(value))
    RELATION_NAME = relation
  }

  def clear: Unit = {
    this.value = None
  }

  def targetClazz = m.erasure.newInstance().asInstanceOf[EntityType]

  def set(value: EntityType) {
    this.value = Some(value)
    // Add field to owner entity
    if (!owner.fields.contains(this)) {
      owner attach me
    }
  }
}