// This throws Exception to remind the caller to deal with arbitrary exceptions including
// RuntimeException
// in a way appropriate for the public method that was originally invoked.
private RestRequest buildRequest(
URI uri,
ResourceMethod method,
DataMap dataMap,
Map<String, String> headers,
List<String> cookies,
ProtocolVersion protocolVersion,
ContentType contentType,
List<AcceptType> acceptTypes)
throws Exception {
RestRequestBuilder requestBuilder =
new RestRequestBuilder(uri).setMethod(method.getHttpMethod().toString());
requestBuilder.setHeaders(headers);
requestBuilder.setCookies(cookies);
addAcceptHeaders(requestBuilder, acceptTypes);
addEntityAndContentTypeHeaders(requestBuilder, dataMap, contentType);
addProtocolVersionHeader(requestBuilder, protocolVersion);
if (method.getHttpMethod() == HttpMethod.POST) {
requestBuilder.setHeader(RestConstants.HEADER_RESTLI_REQUEST_METHOD, method.toString());
}
return requestBuilder.build();
}
// We handle accept types based on the following precedence order:
// 1. Request header
// 2. RestLiRequestOptions
// 3. RestClient configuration
private void addAcceptHeaders(RestRequestBuilder builder, List<AcceptType> acceptTypes) {
if (builder.getHeader(RestConstants.HEADER_ACCEPT) == null) {
List<AcceptType> types = _acceptTypes;
if (acceptTypes != null && !acceptTypes.isEmpty()) {
types = acceptTypes;
}
if (types != null && !types.isEmpty()) {
builder.setHeader(RestConstants.HEADER_ACCEPT, createAcceptHeader(types));
}
}
}
// Request content type resolution follows similar precedence order to accept type:
// 1. Request header
// 2. RestLiRequestOption
// 3. RestClient configuration
private void addEntityAndContentTypeHeaders(
RestRequestBuilder builder, DataMap dataMap, ContentType contentType) throws IOException {
if (dataMap != null) {
String header = builder.getHeader(RestConstants.HEADER_CONTENT_TYPE);
ContentType type;
if (header == null) {
if (contentType != null) {
type = contentType;
} else if (_contentType != null) {
type = _contentType;
} else {
type = DEFAULT_CONTENT_TYPE;
}
builder.setHeader(RestConstants.HEADER_CONTENT_TYPE, type.getHeaderKey());
} else {
javax.mail.internet.ContentType headerContentType;
try {
headerContentType = new javax.mail.internet.ContentType(header);
} catch (ParseException e) {
throw new IllegalStateException("Unable to parse Content-Type: " + header);
}
if (headerContentType
.getBaseType()
.equalsIgnoreCase(RestConstants.HEADER_VALUE_APPLICATION_JSON)) {
type = ContentType.JSON;
} else if (headerContentType
.getBaseType()
.equalsIgnoreCase(RestConstants.HEADER_VALUE_APPLICATION_PSON)) {
type = ContentType.PSON;
} else {
throw new IllegalStateException("Unknown Content-Type: " + headerContentType.toString());
}
}
switch (type) {
case PSON:
builder.setEntity(PSON_DATA_CODEC.mapToBytes(dataMap));
break;
case JSON:
builder.setEntity(JACKSON_DATA_CODEC.mapToBytes(dataMap));
break;
default:
throw new IllegalStateException("Unknown ContentType:" + type);
}
}
}
/**
* Adds the protocol version of Rest.li used to build the request to the headers for this request
*
* @param builder
* @param protocolVersion
*/
private void addProtocolVersionHeader(
RestRequestBuilder builder, ProtocolVersion protocolVersion) {
builder.setHeader(RestConstants.HEADER_RESTLI_PROTOCOL_VERSION, protocolVersion.toString());
}