Use explicit api

[kpavlov]

Switch to Explicit API mode

[Copilot]

Pull Request Overview

This PR converts various API elements to use Kotlin’s explicit API mode by explicitly marking classes, functions, and type aliases as public or internal as appropriate. Key changes include updating test classes to internal visibility, adding public modifiers to public API components, and aligning extension functions and adapter classes with the explicit API requirements.

Reviewed Changes

Copilot reviewed 20 out of 21 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
ServiceWithSystemMessageProviderTest.kt	Changed test class to internal and added a Mockito annotation for clarity.
ServiceWithPromptTemplatesTest.kt	Updated test class visibility to internal.
SimpleTemplateRendererTest.kt	Updated test class visibility to internal.
MetadataExtensionsTest.kt	Updated test class visibility to internal.
ServiceWithFlowTest.kt	Changed test class visibility to internal and ensured proper Mockito usage.
TestEnvironment.kt	Marked the object as internal.
Documents.kt	Added public modifier to the API function.
TemplateSystemMessageProvider.kt	Made the class, functions, and constructors public.
SystemMessageProvider.kt	Made the interface and its members public.
RenderablePromptTemplate.kt	Marked the class and its primary property as public.
PromptTemplateSource.kt	Marked the interface method as public.
PromptTemplate.kt	Added public modifiers to the interface and implementation functions.
ChatRequestExtensions.kt	Updated functions with public modifiers in request builders and related extensions.
StreamingChatLanguageModelExtensions.kt	Added public modifiers to extension functions and nested data classes.
ChatLanguageModelExtensions.kt	Updated extension functions to be public.
TokenStreamToStringFlowAdapter.kt	Added public modifiers to the class and its methods.
TokenStreamToReplyFlowAdapter.kt	Added public modifiers and refined the type parameter check.
TypeAliases.kt	Marked type aliases as public.
Configuration.kt	Updated the object and its members to be public.

Files not reviewed (1)

• langchain4j-kotlin/pom.xml: Language not supported

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.02% (target: -1.00%)	✅ 94.44%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (970793a)	262	251	95.80%
Head commit (ea63b66)	261 (-1)	250 (-1)	95.79% (-0.02%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#124)	36	34	94.44%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

Attention: Patch coverage is 86.11111% with 5 lines in your changes missing coverage. Please review.

Project coverage is 89.69%. Comparing base (970793a) to head (ea63b66).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...j/kotlin/adapters/TokenStreamToReplyFlowAdapter.kt	40.00%	0 Missing and 3 partials ⚠️
...kotlin/model/chat/request/ChatRequestExtensions.kt	87.50%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #124      +/-   ##
==========================================
- Coverage   89.73%   89.69%   -0.04%     
==========================================
  Files          17       17              
  Lines         263      262       -1     
  Branches       33       32       -1     
==========================================
- Hits          236      235       -1     
  Misses         12       12              
  Partials       15       15              

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