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Implement a GetSize() function for the ImageMetadata class

Julien Osman requested to merge 2237-add_GetSize_to_ImageMetadata into develop

Summary

Add a GetSize() function to ImageMetadataBase and ImageMetadata.

Rationale

Fix #2237 (closed)

Implementation Details

Classes and files

Update the class ImageMetadataBase that return the count of key:value pairs contained in the metadata maps (NumericKeys, StringKeys, etc).

Update the class ImageMetadata that return the count of key:value pairs contained in all bands and base object.

Tests

Add a test for this functions.

Copyright

The copyright owner is CNES and has signed the ORFEO ToolBox Contributor License Agreement.

Check before merging:

  • All discussions are resolved
  • At least 2 👍 votes from core developers, no 👎 vote.
  • The feature branch is (reasonably) up-to-date with the base branch
  • Dashboard is green
  • Copyright owner has signed the ORFEO ToolBox Contributor License Agreement
  • Optionally, run git diff develop... -U0 --no-color | clang-format-diff.py -p1 -i on latest changes and commit

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