Package NTNU.IDATT1002.service

Class TagService

java.lang.Object
NTNU.IDATT1002.service.TagService
public class TagService
extends java.lang.Object
Tag Service. Supports common domain specific operations such as converting a list of tags to a string and opposite.
Version:
1.1 01.04.20

  • Constructor Summary

    Constructors 
    Constructor Description
    TagService​(javax.persistence.EntityManager entityManager)
    Inject entity manager instance to the repositories.

  • Method Summary

    Modifier and Type Method Description
    java.util.List<Tag> getOrCreateTags​(java.util.List<Tag> tags)
    Gets or creates given tags in given list.
    Tag getSingleTag​(Tag tag)
    Retrieve given tag.
    static java.lang.String getTagsAsString​(java.util.List<Tag> tags)
    Retrieves tags from list of tags and converts them to a concatenated string.
    static java.util.List<Tag> getTagsFromString​(java.lang.String tagsAsString)
    Retrieves tags from text field and converts them to a list of tag objects.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • TagService

      public TagService​(javax.persistence.EntityManager entityManager)
      Inject entity manager instance to the repositories.

  • Method Details

    • getOrCreateTags

      public java.util.List<Tag> getOrCreateTags​(java.util.List<Tag> tags)
      Gets or creates given tags in given list. Ignores null values.
      Parameters:
      tags - the list of tags
      Returns:
      a list of persisted tags

    • getTagsFromString

      public static java.util.List<Tag> getTagsFromString​(java.lang.String tagsAsString)
      Retrieves tags from text field and converts them to a list of tag objects.
      Returns:
      the list of tag objects

    • getTagsAsString

      public static java.lang.String getTagsAsString​(java.util.List<Tag> tags)
      Retrieves tags from list of tags and converts them to a concatenated string.
      Parameters:
      tags - the list of tags
      Returns:
      the tags as a string

    • getSingleTag

      public Tag getSingleTag​(Tag tag)
      Retrieve given tag. Either get an existing or create it.
      Parameters:
      tag - the tag to retrieve
      Returns:
      the persisted tag, else a new persisted tag instance
      Throws:
      java.lang.IllegalArgumentException - if tag could not be found or created