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src.bak/main/java/com/example/util/ProtobufUtil.java

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+/*
+* Copyright 2025 Google. This software is provided as-is, without warranty or representation for any use or purpose.
+* Your use of it is subject to your agreement with Google.
+*/
+
+package com.example.util;
+
+import com.google.protobuf.ListValue;
+import com.google.protobuf.NullValue;
+import com.google.protobuf.Struct;
+import com.google.protobuf.Value;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class ProtobufUtil {
+
+    private static final Logger logger = LoggerFactory.getLogger(ProtobufUtil.class);
+
+    /**
+     * Converts a Java Object to a Protobuf Value.
+     * Supports primitive types, String, Map, and List.
+     * Maps will be converted to Protobuf Structs.
+     * Lists will be converted to Protobuf ListValues.
+     */
+    @SuppressWarnings("rawtypes")
+    public static Value convertJavaObjectToProtobufValue(Object obj) {
+        if (obj == null) {
+            return Value.newBuilder().setNullValue(NullValue.NULL_VALUE).build();
+        } else if (obj instanceof Boolean) {
+            return Value.newBuilder().setBoolValue((Boolean) obj).build();
+        } else if (obj instanceof Integer) {
+            return Value.newBuilder().setNumberValue(((Integer) obj).doubleValue()).build();
+        } else if (obj instanceof Long) {
+            return Value.newBuilder().setNumberValue(((Long) obj).doubleValue()).build();
+        } else if (obj instanceof Double) {
+            return Value.newBuilder().setNumberValue((Double) obj).build();
+        } else if (obj instanceof String) {
+            return Value.newBuilder().setStringValue((String) obj).build();
+        } else if (obj instanceof Enum) {
+            return Value.newBuilder().setStringValue(((Enum) obj).name()).build();
+        } else if (obj instanceof Map) {
+            Struct.Builder structBuilder = Struct.newBuilder();
+            ((Map<?, ?>) obj).forEach((key, val) ->
+                    structBuilder.putFields(String.valueOf(key), convertJavaObjectToProtobufValue(val))
+            );
+            return Value.newBuilder().setStructValue(structBuilder.build()).build();
+        } else if (obj instanceof List) {
+            ListValue.Builder listValueBuilder = ListValue.newBuilder();
+            ((List<?>) obj).forEach(item ->
+                    listValueBuilder.addValues(convertJavaObjectToProtobufValue(item))
+            );
+            return Value.newBuilder().setListValue(listValueBuilder.build()).build();
+        }
+        logger.warn("Unsupported type for Protobuf conversion: {}. Converting to String.", obj.getClass().getName());
+        return Value.newBuilder().setStringValue(obj.toString()).build();
+    }
+
+    /**
+     * Converts a Protobuf Value to a Java Object.
+     * Supports Null, Boolean, Number, String, Struct (to Map), and ListValue (to List).
+     */
+    public static Object convertProtobufValueToJavaObject(Value protobufValue) {
+        return switch (protobufValue.getKindCase()) {
+            case NULL_VALUE -> null;
+            case BOOL_VALUE -> protobufValue.getBoolValue();
+            case NUMBER_VALUE -> protobufValue.getNumberValue();
+            case STRING_VALUE -> protobufValue.getStringValue();
+            case STRUCT_VALUE -> protobufValue.getStructValue().getFieldsMap().entrySet().stream()
+                    .collect(Collectors.toMap(
+                            Map.Entry::getKey,
+                            entry -> convertProtobufValueToJavaObject(entry.getValue()),
+                            (oldValue, newValue) -> oldValue,
+                            LinkedHashMap::new
+                    ));
+            case LIST_VALUE -> protobufValue.getListValue().getValuesList().stream()
+                    .map(ProtobufUtil::convertProtobufValueToJavaObject) // Use static method reference
+                    .collect(Collectors.toList());
+            default -> {
+                logger.warn("Unsupported Protobuf Value type: {}. Returning null.", protobufValue.getKindCase());
+                yield null;
+            }
+        };
+    }
+}