[PR] feat: Optimize SmartCn Dictionaries and Add Dictionary Loading Tests [lucenenet]

[via GitHub]

NehanPathan opened a new pull request, #1154:
URL: https://github.com/apache/lucenenet/pull/1154

   
   ---
   
   ### 🎯 **Objective:**
   This pull request (PR) optimizes the SmartCn dictionary loading process and 
introduces unit tests to ensure correctness and maintainability.
   
   ---
   
   ### 🔥 **Key Changes:**
   
   ✅ **1. Dictionary Optimization:**  
   - Replaced `ByteBuffer` with `BinaryReader.ReadInt32()` for faster and more 
efficient data reading.  
   - Implemented `ReadOnlySpan<char>`  to minimize memory usage and improve 
overall performance.  
   
   ✅ **2. Comprehensive Unit Tests Added:**  
   - **Test File:** `DictionaryTests.cs`  
       - Contains tests for loading dictionaries and verifying dictionary 
operations.  
   
   - **BigramDictionary Tests:**  
       - `GetInstance()` method to ensure correct singleton instantiation.  
       - `LoadFromFile()` method to verify successful loading of the dictionary 
from `bigramDict.dct`.  
       - `GetFrequency()` method to test frequency retrieval of valid and 
non-existent entries.  
   
   - **WordDictionary Tests:**  
       - `GetInstance()` to confirm proper instantiation.  
       - Future tests can be added if `LoadMainDataFromFile()` becomes 
accessible (Currently it is private method).  
   
   ✅ **3. Resource Files Added:**  
   - **Location:** `Lucene.Net.Tests.Analysis.SmartCn.Resources`  
       - `bigramDict.dct`  
       - `coreDict.dct`  
   
   ✅ **4. Embedded Resource Loading:**  
   - Embedded both `.dct` files as resources in the test assembly to eliminate 
external dependencies.  
   - Created a utility in `LuceneTestCase` to extract these resources as 
temporary files during tests.
   
   ---
   
   ### 🧪 **Testing Details:**
   
   📂 **Test Scenarios:**
   - Validated successful loading of both `bigramDict.dct` and `coreDict.dct` 
from embedded resources.  
   - Checked frequency retrieval for valid entries (`hello`, `world`) and 
ensured non-existent entries return `0`.  
   - Verified that the `GetInstance()` method returns a non-null singleton 
instance.  
   
   ✅ **Assertions Included:**
   - Frequency correctness for known entries.  
   - Proper dictionary instantiation.  
   - No regression in dictionary functionality.
   
   ---
   
   ### 🚀 **Why These Changes?**
   
   💡 **Performance Improvements:**  
   - Faster dictionary loading with reduced memory overhead.  
   
   💡 **Increased Test Coverage:**  
   - Ensures that dictionary operations work correctly and efficiently.  
   
   💡 **Simplified Testing Workflow:**  
   - Embedded resource handling eliminates file path dependencies.  
   
   ---
   
   ### 📝 **Future Considerations:**
   
   🔍 **Testing `WordDictionary`:**  
   - Currently limited to `GetInstance()` due to private access of 
`LoadMainDataFromFile()`.  
   - Additional tests can be added when the method’s visibility is updated.
   
   🚀 **Performance Enhancements:**  
   - Future work may include further performance optimization of dictionary 
lookups and hash collision handling.
   
   ---
   
   ### 📂 **Issue Reference:**  
   Fixes #1153
   
   ---
   
   ### 🔎 **Checklist:**
   
   - [x] Read and followed the [[Contributor 
Guide](https://github.com/apache/lucenenet/blob/main/CONTRIBUTING.md)](https://github.com/apache/lucenenet/blob/main/CONTRIBUTING.md)
 and [[Code of 
Conduct](https://www.apache.org/foundation/policies/conduct.html)](https://www.apache.org/foundation/policies/conduct.html).
  
   - [x] Included relevant unit or integration tests.  
   - [x] Added inline documentation where applicable.  
   - [x] Created an open issue and linked it to this PR.  
   
   ---
   
   ## 📄 **How to Run Tests:**
   1. Build the solution using `dotnet build`.  
   2. Run tests using `dotnet test` to verify that all dictionary operations 
work correctly.  
   
   ---
   
   


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