@Override
public void accept(BsonReader reader) {
reader.readStartArray();
while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) {
BsonSkipper.valueOf(reader.getCurrentBsonType().name()).accept(reader);
}
reader.readEndArray();
}
public void write(ComplexWriter writer, BsonReader reader) throws IOException {
reader.readStartDocument();
BsonType readBsonType = reader.getCurrentBsonType();
switch (readBsonType) {
case DOCUMENT:
writeToListOrMap(reader, new MapOrListWriterImpl(writer.rootAsMap()), false, null);
break;
default:
throw new DrillRuntimeException(
"Root object must be DOCUMENT type. Found: " + readBsonType);
}
}
private Object readValue(final BsonReader reader, final DecoderContext decoderContext) {
BsonType bsonType = reader.getCurrentBsonType();
if (bsonType == BsonType.NULL) {
reader.readNull();
return null;
} else if (bsonType == BsonType.ARRAY) {
return readList(reader, decoderContext);
} else if (bsonType == BsonType.BINARY) {
byte bsonSubType = reader.peekBinarySubType();
if (bsonSubType == BsonBinarySubType.UUID_STANDARD.getValue()
|| bsonSubType == BsonBinarySubType.UUID_LEGACY.getValue()) {
return registry.get(UUID.class).decode(reader, decoderContext);
}
}
return valueTransformer.transform(
registry.get(bsonTypeClassMap.get(bsonType)).decode(reader, decoderContext));
}
private void writeToListOrMap(
BsonReader reader, final MapOrListWriterImpl writer, boolean isList, String fieldName) {
writer.start();
// If isList is true, then filedName can be null as it is not required while
// writing
while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) {
if (!isList) {
fieldName = reader.readName();
}
BsonType currentBsonType = reader.getCurrentBsonType();
switch (currentBsonType) {
case INT32:
int readInt32 = reader.readInt32();
if (readNumbersAsDouble) {
writeDouble(readInt32, writer, fieldName, isList);
} else {
writeInt32(readInt32, writer, fieldName, isList);
}
atLeastOneWrite = true;
break;
case INT64:
long readInt64 = reader.readInt64();
if (readNumbersAsDouble) {
writeDouble(readInt64, writer, fieldName, isList);
} else {
writeInt64(readInt64, writer, fieldName, isList);
}
atLeastOneWrite = true;
break;
case ARRAY:
reader.readStartArray();
writeToListOrMap(reader, (MapOrListWriterImpl) writer.list(fieldName), true, fieldName);
atLeastOneWrite = true;
break;
case BINARY:
// handle types
writeBinary(reader, writer, fieldName, isList);
atLeastOneWrite = true;
break;
case BOOLEAN:
boolean readBoolean = reader.readBoolean();
writeBoolean(readBoolean, writer, fieldName, isList);
atLeastOneWrite = true;
break;
case DATE_TIME:
long readDateTime = reader.readDateTime();
writeDateTime(readDateTime, writer, fieldName, isList);
atLeastOneWrite = true;
break;
case DOCUMENT:
reader.readStartDocument();
// To handle nested Documents.
MapOrListWriterImpl _writer = writer;
if (!isList) {
_writer = (MapOrListWriterImpl) writer.map(fieldName);
} else {
_writer = (MapOrListWriterImpl) writer.listoftmap(fieldName);
}
writeToListOrMap(reader, _writer, false, fieldName);
atLeastOneWrite = true;
break;
case DOUBLE:
double readDouble = reader.readDouble();
writeDouble(readDouble, writer, fieldName, isList);
atLeastOneWrite = true;
break;
case JAVASCRIPT:
final String readJavaScript = reader.readJavaScript();
writeString(readJavaScript, writer, fieldName, isList);
atLeastOneWrite = true;
break;
case JAVASCRIPT_WITH_SCOPE:
final String readJavaScriptWithScopeString = reader.readJavaScriptWithScope();
writeString(readJavaScriptWithScopeString, writer, fieldName, isList);
atLeastOneWrite = true;
break;
case NULL:
// just read and ignore.
reader.readNull();
break;
case OBJECT_ID:
writeObjectId(reader, writer, fieldName, isList);
atLeastOneWrite = true;
break;
case STRING:
final String readString = reader.readString();
writeString(readString, writer, fieldName, isList);
atLeastOneWrite = true;
break;
case SYMBOL:
final String readSymbol = reader.readSymbol();
writeString(readSymbol, writer, fieldName, isList);
atLeastOneWrite = true;
break;
case TIMESTAMP:
int time = reader.readTimestamp().getTime();
writeTimeStamp(time, writer, fieldName, isList);
atLeastOneWrite = true;
break;
default:
// Didn't handled REGULAR_EXPRESSION and DB_POINTER types
throw new DrillRuntimeException("UnSupported Bson type: " + currentBsonType);
}
}
if (!isList) {
reader.readEndDocument();
} else {
reader.readEndArray();
}
}
/**
* This method may be overridden to change the behavior of reading the current value from the
* given {@code BsonReader}. It is required that the value be fully consumed before returning.
*
* @param reader the read to read the value from
* @param decoderContext the context
* @return the non-null value read from the reader
*/
protected BsonValue readValue(final BsonReader reader, final DecoderContext decoderContext) {
return codecRegistry
.get(BsonValueCodecProvider.getClassForBsonType(reader.getCurrentBsonType()))
.decode(reader, decoderContext);
}
public static void skipValue(BsonReader reader) {
BsonSkipper.valueOf(reader.getCurrentBsonType().name()).accept(reader);
}