FHIR R4组件。
项目描述
协议缓冲区转换、验证和FHIR R4资源实用工具。
对分析FHIR数据感兴趣的用户应参考google.fhir.views包。此库包含在Python代码中表示FHIR数据时与协议缓冲区一起工作的底层功能。
FHIR JSON与协议缓冲区的相互转换
json_format包支持将FHIR协议缓冲区转换为FHIR JSON格式，反之亦然。以下是一些简单的示例
from google.fhir.r4 import json_format
from google.fhir.r4.proto.core.resources import patient_pb2
patient_json = """
{
"resourceType" : "Patient",
"id" : "example",
"name" : [{
"use" : "official",
"family" : "Roosevelt",
"given" : ["Franklin", "Delano"]
}]
}
"""
# Read the JSON as a proto:
patient = json_format.json_fhir_string_to_proto(patient_json, patient_pb2.Patient)
# Get the FHIR JSON representation of the proto:
json_format.print_fhir_to_json_string(patient)
FHIRPath支持
FHIRPath是google-fhir-views逻辑的基础，但也可以直接针对FHIR原型本身使用。以下是一个示例
from google.fhir.r4 import fhir_path
from google.fhir.r4 import r4_package
from google.fhir.core.fhir_path import context
# Create the FHIRPath context for use.
fhir_path_context = context.LocalFhirPathContext(r4_package.load_base_r4())
# Compile the FHIRPath expressions for evaluation. This validates the FHIRPath and returns
# an optimized structure that can be efficiently evaluated over protocol buffers.
# The compiled expression is typically created once and reused for many following invocations.
expr = fhir_path.compile_expression('Patient', fhir_path_context, "name.where(use = 'official').family")
# Now we evaluate the expression on the given resource.
result = expr.evaluate(patient)
# Check to see if the result matched anything.
if result.has_value():
# Gets the result as protocol buffer messages.
result_as_messages = result.messages
# Converts the result to a simple string, if applicable.
result_as_simple_string = result.as_string()
该库还支持用于创建FHIRPath表达式的流畅Python构建器，这在google.fhir.views包中得到了广泛使用。以下是使用Python构建器模式创建的上述字符串
# FHIRPath builder for patients.
pat = fhir_path.builder('Patient', fhir_path_context)
# Build the expression and get it in string form.
fhir_path_string = pat.name.where(pat.name.use == 'official').family.fhir_path
