dspace-angular/src/app/core/shared/dspace-object.model.ts

import { autoserialize, autoserializeAs } from "cerialize";
import { Metadatum } from "./metadatum.model"
import { isEmpty, isNotEmpty } from "../../shared/empty.util";
import { CacheableObject } from "../cache/object-cache.reducer";

/**
 * An abstract model class for a DSpaceObject.
 */
export abstract class DSpaceObject implements CacheableObject {

  /**
   * The human-readable identifier of this DSpaceObject
   */
  @autoserialize
  id: string;

  /**
   * The universally unique identifier of this DSpaceObject
   */
  @autoserialize
  uuid: string;

  /**
   * A string representing the kind of DSpaceObject, e.g. community, item, …
   */
  type: string;

  /**
   * The name for this DSpaceObject
   */
  @autoserialize
  name: string;

  /**
   * An array containing all metadata of this DSpaceObject
   */
  @autoserializeAs(Metadatum)
  metadata: Array<Metadatum>;

  /**
   * An array of DSpaceObjects that are direct parents of this DSpaceObject
   */
  parents: Array<DSpaceObject>;

  /**
   * The DSpaceObject that owns this DSpaceObject
   */
  owner: DSpaceObject;

  /**
   * Find a metadata field by key and language
   *
   * This method returns the value of the first element
   * in the metadata array that matches the provided
   * key and language
   *
   * @param key
   * @param language
   * @return string
   */
  findMetadata(key: string, language?: string): string {
    const metadatum = this.metadata
      .find((metadatum: Metadatum) => {
        return metadatum.key === key &&
          (isEmpty(language) || metadatum.language === language)
      });
    if (isNotEmpty(metadatum)) {
      return metadatum.value;
    }
    else {
      return undefined;
    }
  }
}