content: package act.db.meta;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2018 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import org.osgl.$;
  import org.osgl.util.E;
  
  import java.util.Objects;
  
  /**
   * Stores meta information about an Entity field
   */
  public class EntityFieldMetaInfo {
  
      enum Trait {
          ID,
          CREATED_AT,
          CREATED_BY,
          LAST_MODIFIED_AT,
          LAST_MODIFIED_BY
      }
  
      private Trait trait;
      private String className;
      private String fieldName;
      private String columnName;
      private EntityClassMetaInfo classInfo;
  
      EntityFieldMetaInfo(EntityClassMetaInfo classInfo) {
          this.classInfo = $.requireNotNull(classInfo);
      }
  
      public Trait trait() {
          return trait;
      }
  
      public void trait(Trait trait) {
          this.trait = $.requireNotNull(trait);
          if (Trait.CREATED_AT == trait) {
              classInfo.createdAtField(this);
          } else if (Trait.LAST_MODIFIED_AT == trait) {
              classInfo.lastModifiedAtField(this);
          } else if (Trait.ID == trait) {
              classInfo.idField(this);
          } else if (Trait.CREATED_BY == trait) {
              classInfo.createdByField(this);
          } else if (Trait.LAST_MODIFIED_BY == trait) {
              classInfo.lastModifiedByField(this);
          } else {
              throw E.unexpected("oops");
          }
      }
  
      public boolean isCreatedAt() {
          return Trait.CREATED_AT == trait;
      }
  
      public boolean isLastModifiedAt() {
          return Trait.LAST_MODIFIED_AT == trait;
      }
  
      public boolean isCreatedBy() {
          return Trait.CREATED_BY == trait;
      }
  
      public boolean isLastModifiedBy() {
          return Trait.LAST_MODIFIED_BY == trait;
      }
  
      public String className() {
          return className;
      }
  
      public void className(String className) {
          this.className = className;
      }
  
      public String fieldName() {
          return fieldName;
      }
  
      public void fieldName(String fieldName) {
          this.fieldName = fieldName;
          this.columnName = fieldName;
      }
  
      public String columnName() {
          return columnName;
      }
  
      public void columnName(String columnName) {
          this.columnName = columnName;
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
          EntityFieldMetaInfo that = (EntityFieldMetaInfo) o;
          return trait == that.trait &&
                  Objects.equals(className, that.className) &&
                  Objects.equals(fieldName, that.fieldName) &&
                  Objects.equals(columnName, that.columnName);
      }
  
      @Override
      public int hashCode() {
          return Objects.hash(trait, className, fieldName, columnName);
      }
  
      @Override
      public String toString() {
          return "EntityFieldMetaInfo{" +
                  "className='" + className + '\'' +
                  ", fieldName='" + fieldName + '\'' +
                  '}';
      }
  
  }
  