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"""
Base models for the A2A protocol.
"""
import json
from typing import Dict, Any, TypeVar, Type, ClassVar, Optional
from abc import ABC, abstractmethod
from dataclasses import dataclass, asdict, field
T = TypeVar('T', bound='BaseModel')
class BaseModel(ABC):
"""Base class for all A2A models"""
def to_dict(self) -> Dict[str, Any]:
"""
Convert model to dictionary representation
Returns:
Dictionary representation of the model
"""
# The default implementation uses dataclasses.asdict
# Subclasses can override this for custom serialization
return asdict(self)
def to_json(self) -> str:
"""
Convert model to JSON string
Returns:
JSON string representation of the model
"""
return json.dumps(self.to_dict())
@classmethod
def from_dict(cls: Type[T], data: Dict[str, Any]) -> T:
"""
Create model instance from dictionary
Args:
data: Dictionary representation of the model
Returns:
New model instance
"""
# This is an abstract method that subclasses must implement
raise NotImplementedError("Subclasses must implement from_dict")
@classmethod
def from_json(cls: Type[T], json_str: str) -> T:
"""
Create model instance from JSON string
Args:
json_str: JSON string representation of the model
Returns:
New model instance
"""
data = json.loads(json_str)
return cls.from_dict(data)