D19087: Add standalone conversion functions for PropertyMap to Json and vice versa

[Stefan Brüns]

bruns created this revision.
bruns added reviewers: Baloo, Frameworks, ngraham, poboiko, astippich.
Herald added projects: Frameworks, Baloo.
Herald added a subscriber: kde-frameworks-devel.
bruns requested review of this revision.

REVISION SUMMARY
  Baloo caches property data, and uses Json for serializing it. For storing,
  it populates a QVariantMap, where multiple values for the same key are
  stored as a QVariantList (QJsonObject::fromVariantMap only handles one
  value per key). After deserialization, the KFileMetaData::PropertyMap
  also contains QVariantLists for keys with multiple values.
  
  To handle multiple property values per key correctly, do the serialization
  and deserialization manually. This also save the temporary QVariantMap
  on deserialization.
  
  Add unit tests to test roundtrip from PropertyMap to JSon and back. This
  is now possible as the serialization code is no longer done inline.
  
  It makes it also easier to keep serialization and deserialization in
  sync, as it is no longer in different files (src/file/result.cpp and
  src/file/extractor/file.cpp).

TEST PLAN
  ctest

REPOSITORY
  R293 Baloo

BRANCH
  submit

REVISION DETAIL
  https://phabricator.kde.org/D19087

AFFECTED FILES
  autotests/unit/file/CMakeLists.txt
  autotests/unit/file/propertyserializationtest.cpp
  src/file/CMakeLists.txt
  src/file/propertydata.cpp
  src/file/propertydata.h

To: bruns, #baloo, #frameworks, ngraham, poboiko, astippich
Cc: kde-frameworks-devel, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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