AST Serialization

/**
 * Serializer for converting AST nodes to JSON format
 */
public class JavaParserJsonSerializer {
    
    /**
     * Create serializer with default configuration
     */
    public JavaParserJsonSerializer();
    
    /**
     * Serialize AST node to JSON string
     * @param node AST node to serialize
     * @return JSON string representation
     */
    public String serialize(Node node);
    
    /**
     * Serialize AST node to JSON and write to output stream
     * @param node AST node to serialize
     * @param out Output stream to write JSON
     * @throws IOException if writing fails
     */
    public void serialize(Node node, OutputStream out) throws IOException;
    
    /**
     * Serialize AST node to JSON and write to writer
     * @param node AST node to serialize
     * @param writer Writer to output JSON
     * @throws IOException if writing fails
     */
    public void serialize(Node node, Writer writer) throws IOException;
}

import com.github.javaparser.StaticJavaParser;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.serialization.JavaParserJsonSerializer;

// Parse Java code
CompilationUnit cu = StaticJavaParser.parse("""
    public class Example {
        public void hello() {
            System.out.println("Hello World");
        }
    }
    """);

// Serialize to JSON
JavaParserJsonSerializer serializer = new JavaParserJsonSerializer();
String json = serializer.serialize(cu);
System.out.println(json);

// Serialize to file
try (FileOutputStream fos = new FileOutputStream("ast.json")) {
    serializer.serialize(cu, fos);
}

/**
 * Deserializer for converting JSON back to AST nodes
 */
public class JavaParserJsonDeserializer {
    
    /**
     * Create deserializer with default configuration
     */
    public JavaParserJsonDeserializer();
    
    /**
     * Deserialize JSON string to AST node
     * @param json JSON string to deserialize
     * @return Reconstructed AST node
     * @throws JsonProcessingException if JSON parsing fails
     */
    public Node deserialize(String json) throws JsonProcessingException;
    
    /**
     * Deserialize JSON from input stream to AST node
     * @param in Input stream containing JSON
     * @return Reconstructed AST node
     * @throws IOException if reading fails
     * @throws JsonProcessingException if JSON parsing fails
     */
    public Node deserialize(InputStream in) throws IOException, JsonProcessingException;
    
    /**
     * Deserialize JSON from reader to AST node
     * @param reader Reader containing JSON
     * @return Reconstructed AST node
     * @throws IOException if reading fails
     * @throws JsonProcessingException if JSON parsing fails
     */
    public Node deserialize(Reader reader) throws IOException, JsonProcessingException;
    
    /**
     * Deserialize JSON to specific AST node type
     * @param json JSON string to deserialize
     * @param nodeType Expected AST node type
     * @return Reconstructed AST node of specified type
     * @throws JsonProcessingException if JSON parsing fails
     * @throws ClassCastException if JSON doesn't represent expected type
     */
    public <T extends Node> T deserialize(String json, Class<T> nodeType) 
            throws JsonProcessingException;
}

import com.github.javaparser.serialization.JavaParserJsonDeserializer;

JavaParserJsonDeserializer deserializer = new JavaParserJsonDeserializer();

// Deserialize from JSON string
String json = "..."; // JSON representation of AST
Node reconstructedNode = deserializer.deserialize(json);

// Deserialize to specific type
CompilationUnit cu = deserializer.deserialize(json, CompilationUnit.class);

// Deserialize from file
try (FileInputStream fis = new FileInputStream("ast.json")) {
    Node node = deserializer.deserialize(fis);
}

// Round-trip example: serialize and deserialize
CompilationUnit original = StaticJavaParser.parse("public class Test {}");
JavaParserJsonSerializer serializer = new JavaParserJsonSerializer();
String json = serializer.serialize(original);

CompilationUnit restored = deserializer.deserialize(json, CompilationUnit.class);
// restored is functionally equivalent to original

/**
 * Configuration options for JSON serialization
 */
public class JsonSerializationConfiguration {
    
    /**
     * Create default configuration
     */
    public JsonSerializationConfiguration();
    
    /**
     * Enable/disable pretty printing of JSON output
     * @param prettyPrint true to format JSON with indentation
     * @return This configuration for chaining
     */
    public JsonSerializationConfiguration setPrettyPrint(boolean prettyPrint);
    
    /**
     * Include/exclude position information in serialized JSON
     * @param includePositions true to include range/position data
     * @return This configuration for chaining
     */
    public JsonSerializationConfiguration setIncludePositions(boolean includePositions);
    
    /**
     * Include/exclude comments in serialized JSON
     * @param includeComments true to include comment nodes
     * @return This configuration for chaining
     */
    public JsonSerializationConfiguration setIncludeComments(boolean includeComments);
}

// Store parsed AST for later processing
CompilationUnit cu = StaticJavaParser.parse(sourceFile);
String json = serializer.serialize(cu);
database.store(fileName, json);

// Later: retrieve and reconstruct AST
String storedJson = database.retrieve(fileName);
CompilationUnit restored = deserializer.deserialize(storedJson, CompilationUnit.class);

// Send AST over network for remote analysis
String json = serializer.serialize(compilationUnit);
httpClient.post("/analyze", json);

// Receive modified AST back
String modifiedJson = httpClient.receive();
CompilationUnit modified = deserializer.deserialize(modifiedJson, CompilationUnit.class);

// Serialize intermediate results in multi-stage analysis
CompilationUnit parsed = StaticJavaParser.parse(source);
String stage1 = serializer.serialize(parsed);

// Stage 2: symbol resolution (different process/machine)
CompilationUnit stage1AST = deserializer.deserialize(stage1, CompilationUnit.class);
// ... perform symbol resolution ...
String stage2 = serializer.serialize(stage1AST);

// Stage 3: code transformation
CompilationUnit stage2AST = deserializer.deserialize(stage2, CompilationUnit.class);
// ... perform transformations ...