fix(devins-java): improve symbol resolution logic #101

Improve symbol resolution by adding support for package names, class names, and single class with function names. Refactored code to use JavaFileManagerImpl for better retrieval of class and package information.

java/src/main/kotlin/cc/unitmesh/idea/provider/JavaCustomDevInsSymbolProvider.kt

@@ -54,17 +54,26 @@ class JavaCustomDevInsSymbolProvider : DevInsSymbolProvider {
     override fun resolveSymbol(project: Project, symbol: String): Iterable<String> {
         val scope = GlobalSearchScope.allScope(project)
 
+        // for package name only, like `cc.unitmesh`
         JavaFileManagerImpl(project).findPackage(symbol)?.let { pkg ->
             return pkg.classes.map { it.qualifiedName!! }
         }
 
-        // for class name only
+        // for class name only, like `cc.unitmesh.idea.provider.JavaCustomDevInsSymbolProvider`
         val psiClasses = PsiShortNamesCache.getInstance(project).getClassesByName(symbol, scope)
         if (psiClasses.isNotEmpty()) {
             return psiClasses.map { it.qualifiedName!! }
         }
 
+        // for single class, with function name, like `cc.unitmesh.idea.provider.JavaCustomDevInsSymbolProvider`
+        val clazz = JavaFileManagerImpl(project).findClass(symbol, scope)
+        if (clazz != null) {
+            return clazz.methods.map { "${clazz.qualifiedName}#${it.name}" }
+        }
+
         // for lookup for method
+
+
         return emptyList()
     }
 }