private void parseField(
List<String> fieldNames,
List<ColumnMetaData.Rep> fieldTypes,
Row.RowBuilder rowBuilder,
JsonParser parser)
throws IOException {
final String fieldName = parser.getCurrentName();
// Move to next token, which is name's value
JsonToken token = parser.nextToken();
int i = fieldNames.indexOf(fieldName);
if (i < 0) {
return;
}
ColumnMetaData.Rep type = fieldTypes.get(i);
switch (token) {
case VALUE_NUMBER_INT:
if (type == null) {
type = ColumnMetaData.Rep.INTEGER;
}
// fall through
case VALUE_NUMBER_FLOAT:
if (type == null) {
type = ColumnMetaData.Rep.FLOAT;
}
switch (type) {
case BYTE:
rowBuilder.set(i, parser.getByteValue());
break;
case SHORT:
rowBuilder.set(i, parser.getShortValue());
break;
case INTEGER:
rowBuilder.set(i, parser.getIntValue());
break;
case LONG:
rowBuilder.set(i, parser.getLongValue());
break;
case FLOAT:
rowBuilder.set(i, parser.getFloatValue());
break;
case DOUBLE:
rowBuilder.set(i, parser.getDoubleValue());
break;
}
break;
case VALUE_TRUE:
rowBuilder.set(i, true);
break;
case VALUE_FALSE:
rowBuilder.set(i, false);
break;
case VALUE_NULL:
break;
case VALUE_STRING:
default:
if (type == ColumnMetaData.Rep.JAVA_SQL_TIMESTAMP) {
try {
final Date parse = UTC_TIMESTAMP_FORMAT.parse(parser.getText());
rowBuilder.set(i, parse.getTime());
} catch (ParseException e) {
// ignore bad value
}
} else {
rowBuilder.set(i, parser.getText());
}
break;
}
}
/** Parses the output of a {@code topN} query, sending the results to a {@link Sink}. */
private void parse(
QueryType queryType,
InputStream in,
Sink sink,
List<String> fieldNames,
List<ColumnMetaData.Rep> fieldTypes,
Page page) {
final JsonFactory factory = new JsonFactory();
final Row.RowBuilder rowBuilder = Row.newBuilder(fieldNames.size());
if (CalcitePrepareImpl.DEBUG) {
try {
final byte[] bytes = AvaticaUtils.readFullyToBytes(in);
System.out.println("Response: " + new String(bytes));
in = new ByteArrayInputStream(bytes);
} catch (IOException e) {
throw Throwables.propagate(e);
}
}
try (final JsonParser parser = factory.createParser(in)) {
switch (queryType) {
case TOP_N:
if (parser.nextToken() == JsonToken.START_ARRAY
&& parser.nextToken() == JsonToken.START_OBJECT) {
expectScalarField(parser, "timestamp");
if (parser.nextToken() == JsonToken.FIELD_NAME
&& parser.getCurrentName().equals("result")
&& parser.nextToken() == JsonToken.START_ARRAY) {
while (parser.nextToken() == JsonToken.START_OBJECT) {
// loop until token equal to "}"
parseFields(fieldNames, fieldTypes, rowBuilder, parser);
sink.send(rowBuilder.build());
rowBuilder.reset();
}
}
}
break;
case SELECT:
if (parser.nextToken() == JsonToken.START_ARRAY
&& parser.nextToken() == JsonToken.START_OBJECT) {
page.pagingIdentifier = null;
page.offset = -1;
expectScalarField(parser, "timestamp");
if (parser.nextToken() == JsonToken.FIELD_NAME
&& parser.getCurrentName().equals("result")
&& parser.nextToken() == JsonToken.START_OBJECT) {
if (parser.nextToken() == JsonToken.FIELD_NAME
&& parser.getCurrentName().equals("pagingIdentifiers")
&& parser.nextToken() == JsonToken.START_OBJECT) {
switch (parser.nextToken()) {
case FIELD_NAME:
page.pagingIdentifier = parser.getCurrentName();
if (parser.nextToken() == JsonToken.VALUE_NUMBER_INT) {
page.offset = parser.getIntValue();
}
expect(parser, JsonToken.END_OBJECT);
break;
case END_OBJECT:
}
}
if (parser.nextToken() == JsonToken.FIELD_NAME
&& parser.getCurrentName().equals("events")
&& parser.nextToken() == JsonToken.START_ARRAY) {
while (parser.nextToken() == JsonToken.START_OBJECT) {
expectScalarField(parser, "segmentId");
expectScalarField(parser, "offset");
if (parser.nextToken() == JsonToken.FIELD_NAME
&& parser.getCurrentName().equals("event")
&& parser.nextToken() == JsonToken.START_OBJECT) {
parseFields(fieldNames, fieldTypes, rowBuilder, parser);
sink.send(rowBuilder.build());
rowBuilder.reset();
}
expect(parser, JsonToken.END_OBJECT);
}
parser.nextToken();
}
}
}
break;
case GROUP_BY:
if (parser.nextToken() == JsonToken.START_ARRAY) {
while (parser.nextToken() == JsonToken.START_OBJECT) {
expectScalarField(parser, "version");
expectScalarField(parser, "timestamp");
if (parser.nextToken() == JsonToken.FIELD_NAME
&& parser.getCurrentName().equals("event")
&& parser.nextToken() == JsonToken.START_OBJECT) {
parseFields(fieldNames, fieldTypes, rowBuilder, parser);
sink.send(rowBuilder.build());
rowBuilder.reset();
}
expect(parser, JsonToken.END_OBJECT);
}
}
}
} catch (IOException | InterruptedException e) {
throw Throwables.propagate(e);
}
}