Symbol Resolution and Type Analysis

/**
 * Interface for resolving symbols to their declarations
 */
public interface SymbolResolver {
    
    /**
     * Resolve a node to its declaration
     * @param node Node to resolve
     * @param resultClass Expected type of resolved declaration
     * @return Resolved declaration
     * @throws UnsolvedSymbolException if symbol cannot be resolved
     */
    <T> T resolveDeclaration(Node node, Class<T> resultClass);
    
    /**
     * Resolve a reference expression to its declaration
     * @param nameExpr Name expression to resolve
     * @return Resolved value declaration
     */
    ResolvedValueDeclaration resolveDeclaration(NameExpr nameExpr);
    
    /**
     * Resolve a method call to its declaration
     * @param methodCallExpr Method call expression to resolve
     * @return Resolved method declaration
     */
    ResolvedMethodDeclaration resolveDeclaration(MethodCallExpr methodCallExpr);
    
    /**
     * Resolve a type to its declaration
     * @param type Type to resolve
     * @return Resolved type declaration
     */
    ResolvedReferenceTypeDeclaration resolveDeclaration(ClassOrInterfaceType type);
}

/**
 * Configure parser with symbol resolution
 */
public class ParserConfiguration {
    
    /**
     * Set symbol resolver for type analysis
     * @param symbolResolver Symbol resolver implementation
     * @return This configuration for chaining
     */
    public ParserConfiguration setSymbolResolver(SymbolResolver symbolResolver);
}

import com.github.javaparser.symbolsolver.JavaSymbolSolver;
import com.github.javaparser.symbolsolver.resolution.typesolvers.CombinedTypeSolver;
import com.github.javaparser.symbolsolver.resolution.typesolvers.ReflectionTypeSolver;
import com.github.javaparser.symbolsolver.resolution.typesolvers.JavaParserTypeSolver;

// Configure symbol resolution
CombinedTypeSolver typeSolver = new CombinedTypeSolver();
typeSolver.add(new ReflectionTypeSolver()); // For JDK classes
typeSolver.add(new JavaParserTypeSolver(new File("src/main/java"))); // For project classes

JavaSymbolSolver symbolResolver = new JavaSymbolSolver(typeSolver);
ParserConfiguration config = new ParserConfiguration()
    .setSymbolResolver(symbolResolver);

// Parse with symbol resolution enabled
JavaParser parser = new JavaParser(config);
CompilationUnit cu = parser.parse(code).getResult().get();

// Now you can resolve symbols
for (NameExpr nameExpr : cu.findAll(NameExpr.class)) {
    try {
        ResolvedValueDeclaration resolved = nameExpr.resolve();
        System.out.println("Resolved: " + resolved.getName() + " -> " + resolved.getType());
    } catch (UnsolvedSymbolException e) {
        System.out.println("Could not resolve: " + nameExpr.getNameAsString());
    }
}

/**
 * Interface for solving/locating type declarations
 */
public interface TypeSolver {
    
    /**
     * Try to solve a type by name
     * @param name Fully qualified or simple type name
     * @return SymbolReference to the type declaration
     */
    SymbolReference<ResolvedReferenceTypeDeclaration> tryToSolveType(String name);
    
    /**
     * Get parent type solver if this is a chained solver
     * @return Parent type solver or null
     */
    TypeSolver getParent();
    
    /**
     * Set parent type solver for chaining
     * @param parent Parent type solver
     */
    void setParent(TypeSolver parent);
}

/**
 * Combined type solver that chains multiple solvers
 */
public class CombinedTypeSolver implements TypeSolver {
    
    /**
     * Create empty combined solver
     */
    public CombinedTypeSolver();
    
    /**
     * Create with initial solvers
     * @param solvers Initial type solvers
     */
    public CombinedTypeSolver(TypeSolver... solvers);
    
    /**
     * Add a type solver to the chain
     * @param typeSolver Type solver to add
     */
    public void add(TypeSolver typeSolver);
}

/**
 * Reflection-based type solver for JDK and classpath classes
 */
public class ReflectionTypeSolver implements TypeSolver {
    
    /**
     * Create reflection solver for current JRE
     */
    public ReflectionTypeSolver();
    
    /**
     * Create reflection solver with explicit classloader
     * @param classLoader ClassLoader to use for type resolution
     */
    public ReflectionTypeSolver(ClassLoader classLoader);
    
    /**
     * Create reflection solver with filtering
     * @param exploreJDK true to include JDK classes
     */
    public ReflectionTypeSolver(boolean exploreJDK);
}

/**
 * JavaParser-based type solver for source code
 */
public class JavaParserTypeSolver implements TypeSolver {
    
    /**
     * Create solver for source directory
     * @param srcDir Source root directory
     */
    public JavaParserTypeSolver(File srcDir);
    
    /**
     * Create solver for source directory with parser configuration
     * @param srcDir Source root directory
     * @param parserConfiguration Parser configuration to use
     */
    public JavaParserTypeSolver(File srcDir, ParserConfiguration parserConfiguration);
}

// Set up comprehensive type resolution
CombinedTypeSolver typeSolver = new CombinedTypeSolver();

// Add JDK classes
typeSolver.add(new ReflectionTypeSolver());

// Add project source code
typeSolver.add(new JavaParserTypeSolver(new File("src/main/java")));
typeSolver.add(new JavaParserTypeSolver(new File("src/test/java")));

// Add JAR dependencies
typeSolver.add(new JarTypeSolver(new File("lib/dependency.jar")));

// Use in symbol resolver
JavaSymbolSolver symbolResolver = new JavaSymbolSolver(typeSolver);

/**
 * Base interface for resolved declarations
 */
public interface ResolvedDeclaration {
    
    /**
     * Get declaration name
     * @return Name of the declaration
     */
    String getName();
    
    /**
     * Check if this is a field declaration
     * @return true if this is a field
     */
    default boolean isField() { return false; }
    
    /**
     * Check if this is a parameter declaration
     * @return true if this is a parameter
     */
    default boolean isParameter() { return false; }
    
    /**
     * Check if this is a variable declaration
     * @return true if this is a variable
     */
    default boolean isVariable() { return false; }
    
    /**
     * Check if this is a method declaration
     * @return true if this is a method
     */
    default boolean isMethod() { return false; }
    
    /**
     * Check if this is a type declaration
     * @return true if this is a type
     */
    default boolean isType() { return false; }
}

/**
 * Resolved value declaration (fields, parameters, variables)
 */
public interface ResolvedValueDeclaration extends ResolvedDeclaration {
    
    /**
     * Get the type of this value
     * @return Resolved type
     */
    ResolvedType getType();
}

/**
 * Resolved method declaration
 */
public interface ResolvedMethodDeclaration extends ResolvedDeclaration {
    
    /**
     * Get return type
     * @return Resolved return type
     */
    ResolvedType getReturnType();
    
    /**
     * Get method parameters
     * @return List of resolved parameters
     */
    List<ResolvedParameterDeclaration> getParams();
    
    /**
     * Get number of parameters
     * @return Parameter count
     */
    int getNumberOfParams();
    
    /**
     * Get parameter at index
     * @param i Parameter index
     * @return Resolved parameter declaration
     */
    ResolvedParameterDeclaration getParam(int i);
    
    /**
     * Check if method is static
     * @return true if static
     */
    boolean isStatic();
    
    /**
     * Get declaring type
     * @return Type that declares this method
     */
    ResolvedReferenceTypeDeclaration declaringType();
}

/**
 * Resolved type declaration (classes, interfaces, enums)
 */
public interface ResolvedTypeDeclaration extends ResolvedDeclaration {
    
    /**
     * Get qualified name
     * @return Fully qualified name
     */
    String getQualifiedName();
    
    /**
     * Get package name
     * @return Package name
     */
    String getPackageName();
    
    /**
     * Get class name without package
     * @return Simple class name
     */
    String getClassName();
    
    /**
     * Check if this is a class
     * @return true if this is a class
     */
    default boolean isClass() { return false; }
    
    /**
     * Check if this is an interface
     * @return true if this is an interface
     */
    default boolean isInterface() { return false; }
    
    /**
     * Check if this is an enum
     * @return true if this is an enum
     */
    default boolean isEnum() { return false; }
}

// Resolve method calls
for (MethodCallExpr methodCall : cu.findAll(MethodCallExpr.class)) {
    try {
        ResolvedMethodDeclaration resolved = methodCall.resolve();
        System.out.println("Method: " + resolved.getQualifiedSignature());
        System.out.println("Return type: " + resolved.getReturnType());
        System.out.println("Declaring class: " + resolved.declaringType().getQualifiedName());
        
        for (int i = 0; i < resolved.getNumberOfParams(); i++) {
            ResolvedParameterDeclaration param = resolved.getParam(i);
            System.out.println("Param " + i + ": " + param.getType());
        }
    } catch (UnsolvedSymbolException e) {
        System.out.println("Could not resolve method: " + methodCall);
    }
}

// Resolve field access
for (FieldAccessExpr fieldAccess : cu.findAll(FieldAccessExpr.class)) {
    try {
        ResolvedValueDeclaration resolved = fieldAccess.resolve();
        System.out.println("Field: " + resolved.getName());
        System.out.println("Type: " + resolved.getType());
    } catch (UnsolvedSymbolException e) {
        System.out.println("Could not resolve field: " + fieldAccess);
    }
}

/**
 * Base interface for resolved types
 */
public interface ResolvedType {
    
    /**
     * Get type description
     * @return Human-readable type description
     */
    String describe();
    
    /**
     * Check if this is a reference type
     * @return true if reference type
     */
    boolean isReferenceType();
    
    /**
     * Check if this is a primitive type
     * @return true if primitive type
     */
    boolean isPrimitive();
    
    /**
     * Check if this is an array type
     * @return true if array type
     */
    boolean isArray();
    
    /**
     * Check if this is assignable to another type
     * @param other Target type
     * @return true if assignable
     */
    boolean isAssignableBy(ResolvedType other);
}

/**
 * Resolved reference type (classes, interfaces)
 */
public interface ResolvedReferenceType extends ResolvedType {
    
    /**
     * Get type declaration
     * @return Type declaration
     */
    ResolvedReferenceTypeDeclaration getTypeDeclaration();
    
    /**
     * Get type parameters
     * @return List of type parameters
     */
    List<ResolvedType> getTypeParametersMap();
    
    /**
     * Check if this type is assignable to another
     * @param other Target type
     * @return true if assignable
     */
    boolean isAssignableBy(ResolvedType other);
}

/**
 * Resolved primitive type
 */
public interface ResolvedPrimitiveType extends ResolvedType {
    
    /**
     * Get primitive type kind
     * @return Primitive type
     */
    ResolvedPrimitiveType.Primitive getType();
    
    public enum Primitive {
        BOOLEAN, CHAR, BYTE, SHORT, INT, LONG, FLOAT, DOUBLE
    }
}

// Analyze expression types
for (Expression expr : cu.findAll(Expression.class)) {
    try {
        ResolvedType type = expr.calculateResolvedType();
        System.out.println("Expression: " + expr);
        System.out.println("Type: " + type.describe());
        
        if (type.isPrimitive()) {
            ResolvedPrimitiveType primitive = type.asPrimitive();
            System.out.println("Primitive: " + primitive.getType());
        } else if (type.isReferenceType()) {
            ResolvedReferenceType refType = type.asReferenceType();
            System.out.println("Class: " + refType.getQualifiedName());
        }
    } catch (UnsolvedSymbolException e) {
        System.out.println("Could not resolve type for: " + expr);
    }
}

// Check type compatibility
ResolvedType stringType = ...; // resolved String type
ResolvedType objectType = ...; // resolved Object type

boolean assignable = objectType.isAssignableBy(stringType); // true

/**
 * Resolution context for symbol lookup
 */
public class Context {
    
    /**
     * Solve symbol in this context
     * @param name Symbol name to resolve
     * @return Symbol reference
     */
    public SymbolReference<? extends ResolvedValueDeclaration> solveSymbol(String name);
    
    /**
     * Solve method in this context
     * @param name Method name
     * @param argumentTypes Argument types
     * @return Method reference
     */
    public SymbolReference<ResolvedMethodDeclaration> solveMethod(
        String name, List<ResolvedType> argumentTypes);
    
    /**
     * Get parent context
     * @return Parent context or null
     */
    public Context getParent();
}

/**
 * Utility for navigating symbol resolution
 */
public class Navigator {
    
    /**
     * Get local variables in scope at a node
     * @param node AST node
     * @return List of local variables
     */
    public static List<ResolvedValueDeclaration> getLocalVariables(Node node);
    
    /**
     * Find method declarations in a type
     * @param type Type to search
     * @param name Method name
     * @return List of matching methods
     */
    public static List<ResolvedMethodDeclaration> findMethods(
        ResolvedReferenceTypeDeclaration type, String name);
}

/**
 * Exception thrown when symbol cannot be resolved
 */
public class UnsolvedSymbolException extends RuntimeException {
    
    /**
     * Get the unresolved symbol name
     * @return Symbol name
     */
    public String getName();
    
    /**
     * Get context where resolution failed
     * @return Resolution context
     */
    public Context getContext();
}

/**
 * Exception for method resolution ambiguity
 */
public class MethodAmbiguityException extends RuntimeException {
    
    /**
     * Get candidate methods
     * @return List of candidate methods
     */
    public List<ResolvedMethodDeclaration> getCandidates();
}