Magnolia 6 UI ports of 5 UI field transformer classes

Magnolia 5 UI field transformer classes no longer exist in the Magnolia 6 UI framework. The transformer functionality is now distributed among different components. The following is a summary of what the components do:

Modify the target property name by appending a locale suffix or by prepending a field prefix. This is done by concrete PropertySet implementations (JcrItemPropertySet) and/or by PropertyNameDecorator.
Resolve an item data source of complex fields, a functionality usually covered by item providers.
Manage item data sources of multi-value field entries. This is handled by MultiFormView.EntryResolution, which resolves the children and binds each of them to the item provider strategy.

Replacements for field transformers

Default 5 UI transformer classes

*`info.magnolia.ui.form.field.transformer.`**	In 6 UI
`basic.BasicTransformer`	Not needed. Its functions are obsolete; some are taken over by Vaadin PropertySet.
`composite.CompositeTransformer`	Use `info.magnolia.ui.editor.CurrentItemProvider` and set `propertyNameDecorator` to `info.magnolia.ui.field.PrefixNameDecorator`.
`composite.SwitchableTransformer`	Use `info.magnolia.ui.editor.CurrentItemProvider` and set `propertyNameDecorator` to `info.magnolia.ui.field.PrefixNameDecorator`.

Example side-by-side configurations

Switchable in 5 UI

Switchable in 6 UI

- name: tabSwitch
      fields:
        - name: message
          fieldType: switchable
          label: Message
          options:
            - name: plainText
              value: plainText
            - name: richText
              value: richText
          fields:
            - name: plainText
              fieldType: text
            - name: richText
              fieldType: richText

  properties:
    message:
      $type: switchableField
      field:
        $type: radioButtonGroupField
        datasource:
          $type: optionListDatasource
          options:
            - name: plain
              value: plain
            - name: rich
              value: rich
      itemProvider:
        $type: currentItemProvider
      propertyNameDecorator: info.magnolia.ui.field.PrefixNameDecorator
      forms:
        - name: plain
          properties:
            plainText:
              $type: textField
        - name: rich
          properties:
            richText:
              $type: richTextField

Other 5 UI transformer classes

`info.magnolia.ui.form.field.transformer.*`	In 6 UI
`composite.DelegatingCompositeFieldTransformer`	Use `info.magnolia.ui.editor.CurrentItemProvider`.
`composite.NoOpCompositeTransformer`	Not needed.
`multi.DelegatingMultiValueFieldTransformer`	Use `info.magnolia.ui.editor.CurrentItemProvider`.
`multi.DelegatingMultiValueSubnodeTransformer`	Use `info.magnolia.ui.editor.JcrChildNodeProvider` and set: `supportI18N` to `false` `propertyNameDecorator` to `info.magnolia.ui.field.AlwaysEmptyPrefixNameDecorator`
`multi.MultiValueChildNodeTransformer`	Deprecated, no automatic conversion.
`multi.MultiValueChildrenNodeTransformer`	Deprecated, no automatic conversion.
`multi.MultiValueJSONTransformer`	Deprecated, no automatic conversion.
`multi.MultiValueSubChildrenNodePropertiesTransformer`	Use `info.magnolia.ui.editor.JcrChildNodeProvider` and set: `supportI18N` to `false` `entryResolution` to the now deprecated `info.magnolia.ui.editor.ByLexicographicallyIndexedChildNodes$Definition`
`multi.MultiValueSubChildrenNodeTransformer`	Deprecated, no automatic conversion.

Personalization (trait) transformers

The 5 UI transformers with personalization-related functions have undergone the following changes, but still use the old framework (magnolia-personalization-compatibility).

*`info.magnolia.personalization.`**	Description
`cookie.CookieFieldTransformer`	Custom transformer for cookie traits.
`ui.SimpleTraitValueTransformer`	Now functions as the default trait transformer.
`visitor.transformer.VisitorTraitListToSetTransformer`	Still exists, but is no longer needed.

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