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Converting between JSON and XML for FHIR.
package com.ainq.kboone.tools;
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.List;
import org.apache.commons.io.FileUtils;
import org.hl7.fhir.instance.model.api.IBaseResource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.DefaultApplicationArguments;
import ca.uhn.fhir.context.FhirContext;
import ca.uhn.fhir.parser.IParser;
/**
* Convert a file from JSON to XML or XML to JSON
* using various FHIR Versions.
*
* To use this, you need
* <dependency>
* <groupId>ca.uhn.hapi.fhir</groupId>
* <artifactId>hapi-fhir-structures-hl7org-dstu2</artifactId>
* <version>4.2.0</version>
* </dependency>
* <dependency>
* <groupId>ca.uhn.hapi.fhir</groupId>
* <artifactId>hapi-fhir-structures-r4</artifactId>
* <version>4.2.0</version>
* </dependency>
* <dependency>
* <groupId>ca.uhn.hapi.fhir</groupId>
* <artifactId>hapi-fhir-validation-resources-dstu2</artifactId>
* <version>4.2.0</version>
* </dependency>
* <dependency>
* <groupId>org.springframework.boot</groupId>
* <artifactId>spring-boot-starter-actuator</artifactId>
* <version>1.5.6.RELEASE</version>
* </dependency>
*
* @author Keith W. Boone
*
*/
public class Converter {
public static final Logger LOGGER = LoggerFactory.getLogger(Converter.class);
private static <T> T coalesce(T a, T b) {
return a != null ? a : b;
}
public static void main(String args[]) {
ApplicationArguments cmdLineArgs = new DefaultApplicationArguments(args);
FhirContext ctx = null;
String version = "default";
if (cmdLineArgs.containsOption("v") || cmdLineArgs.containsOption("version")) {
List<String> versions = coalesce(cmdLineArgs.getOptionValues("v"), cmdLineArgs.getOptionValues("version"));
if (!versions.isEmpty()) {
if (versions.size() > 1) {
LOGGER.error("Can only convert one version at a time: {}", versions);
System.exit(1);
}
version = versions.get(0);
}
}
switch (version.toLowerCase()) {
case "dstu2":
ctx = FhirContext.forDstu2Hl7Org();
break;
case "stu3":
ctx = FhirContext.forDstu3();
break;
case "default":
case "r4":
ctx = FhirContext.forR4();
break;
}
for (String arg: cmdLineArgs.getNonOptionArgs()) {
convert(ctx, arg);
}
}
private static void convert(FhirContext ctx, String arg) {
IParser jp = ctx.newJsonParser(),
xp = ctx.newXmlParser();
String input = null, output = null, file = null;
try {
input = FileUtils.readFileToString(new File(arg), StandardCharsets.UTF_8);
} catch (IOException e) {
LOGGER.error("Error reading {}", arg, e);
return;
}
boolean inputIsXml = false;
if (arg.toLowerCase().endsWith(".xml")) {
inputIsXml = true;
}
IParser ip = inputIsXml ? xp : jp,
op = inputIsXml ? jp : xp;
IBaseResource ri = null;
ri = ip.parseResource(input);
output = op.setPrettyPrint(true).encodeResourceToString(ri);
try {
file = arg.replace(inputIsXml ? "xml" : "json",
inputIsXml ? "json" : "xml");
FileUtils.writeStringToFile(new File(file), output, StandardCharsets.UTF_8);
} catch (IOException e) {
LOGGER.error("Error reading {}", arg, e);
return;
}
LOGGER.info("Converted {} to {}", arg, file);
}
}
@keithboone

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@keithboone keithboone commented Apr 15, 2020

This is a simple program to Convert between JSON and XML representations for FHIR Resources.

Usage: java com.ainq.kboone.tools.Converter resourceFileName{.json|.xml} ...

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