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JsonToCDADocumentTransformer.java
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JsonToCDADocumentTransformer.java
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package uk.nhs.ciao.cda.builder.processor;
import java.io.IOException;
import java.util.Collection;
import java.util.Map;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Preconditions;
import com.google.common.base.Strings;
import com.google.common.collect.Maps;
import uk.nhs.ciao.docs.parser.Document;
import uk.nhs.ciao.docs.parser.ParsedDocument;
import uk.nhs.interoperability.payloads.Payload;
import uk.nhs.interoperability.payloads.exceptions.MissingMandatoryFieldException;
/**
* Transforms an incoming JSON document into a CDA document determined by the ITK interaction (properties.itkHandlingSpec)
* <p>
* To register additional interaction->payload conversions use: {@link #setPayloadHandlers(Collection)}.
* <p>
* A default/fall-back payload handler can be registered via {@link #setDefaultPayloadHandler(PayloadHandler)}
*/
public class JsonToCDADocumentTransformer {
private final ObjectMapper objectMapper;
private final Map<String, PayloadHandler> payloadHandlersByInteration = Maps.newHashMap();
private PayloadHandler defaultPayloadHandler;
public JsonToCDADocumentTransformer(final ObjectMapper objectMapper) {
this.objectMapper = Preconditions.checkNotNull(objectMapper);
}
public void setPayloadHandlers(final Collection<? extends PayloadHandler> payloadHandlers) {
payloadHandlersByInteration.clear();
for (final PayloadHandler payloadHandler: payloadHandlers) {
registerPayloadHandler(payloadHandler);
}
}
public void setDefaultPayloadHandler(final PayloadHandler defaultPayloadHandler) {
this.defaultPayloadHandler = defaultPayloadHandler;
}
public final void registerPayloadHandler(final PayloadHandler payloadHandler) {
if (payloadHandler != null) {
payloadHandlersByInteration.put(payloadHandler.getInteraction(), payloadHandler);
}
}
/**
* Transforms the incoming JSON document into a CDA encoded parsed document
*/
public ParsedDocument transform(final String json) throws IOException, MissingMandatoryFieldException {
// Only parse the JSON once - then traverse the parsed nodes on each pass
final JsonNode rootNode = objectMapper.readTree(json);
final String interaction = getInteration(rootNode);
final PayloadHandler payloadHandler = getPayloadHandler(interaction);
if (payloadHandler == null) {
throw new IOException("Cannot create CDA document - no handler is available to create the payload");
}
final Payload payload = payloadHandler.transformPayload(objectMapper, rootNode.traverse());
if (payload == null) {
throw new IOException("Cannot create CDA document - no payload is available");
}
final ParsedDocument parsedDocument = objectMapper.readValue(rootNode.traverse(), ParsedDocument.class);
// The original properties and filename from the incoming JSON are maintained in the outgoing document
final String name = parsedDocument.getOriginalDocument().getName();
final Map<String, Object> properties = parsedDocument.getProperties();
return asParsedDocument(name, payload, properties);
}
private String getInteration(final JsonNode rootNode) {
String interation = null;
final JsonNode propertiesNode = rootNode.get("properties");
if (propertiesNode != null) {
final JsonNode interationNode = propertiesNode.get("itkHandlingSpec");
if (interationNode != null) {
interation = interationNode.asText();
}
}
return Strings.nullToEmpty(interation).trim();
}
private PayloadHandler getPayloadHandler(final String interaction) {
final PayloadHandler payloadHandler = payloadHandlersByInteration.get(interaction);
return payloadHandler == null ? defaultPayloadHandler : payloadHandler;
}
/**
* Creates a new ParsedDocument using an encoded clinical document as the payload
* and the specified properties
*/
private ParsedDocument asParsedDocument(final String name, final Payload payload,
final Map<String, Object> properties) {
final byte[] bytes = payload.serialise().getBytes();
final Document document = new Document(name, bytes, "text/xml");
return new ParsedDocument(document, properties);
}
}