/**
* Reads binary data from the input stream
*
* @return the json token read
* @throws IOException if an I/O error occurs
*/
protected JsonToken handleBinary() throws IOException {
int size = _in.readInt();
byte subtype = _in.readByte();
Context ctx = getContext();
switch (subtype) {
case BsonConstants.SUBTYPE_BINARY_OLD:
int size2 = _in.readInt();
byte[] buf2 = new byte[size2];
_in.readFully(buf2);
ctx.value = buf2;
break;
case BsonConstants.SUBTYPE_UUID:
long l1 = _in.readLong();
long l2 = _in.readLong();
ctx.value = new UUID(l1, l2);
break;
default:
byte[] buf = new byte[size];
_in.readFully(buf);
ctx.value = buf;
break;
}
return JsonToken.VALUE_EMBEDDED_OBJECT;
}
/**
* Reads a string that consists of a integer denoting the number of bytes, the bytes (including a
* terminating 0 byte)
*
* @return the string
* @throws IOException if the string could not be read
*/
protected String readString() throws IOException {
// read number of bytes
int bytes = _in.readInt();
if (bytes <= 0) {
throw new IOException("Invalid number of string bytes");
}
String s;
if (bytes > 1) {
s = _in.readUTF(bytes - 1);
} else {
s = "";
}
// read terminating zero
_in.readByte();
return s;
}
/**
* Skips over a null-terminated string in the input stream
*
* @throws IOException if an I/O error occurs
*/
protected void skipCString() throws IOException {
while (_in.readByte() != 0) ;
}
@Override
public JsonToken nextToken() throws IOException, JsonParseException {
Context ctx = _contexts.peek();
if (_currToken == null && ctx == null) {
_currToken = handleNewDocument(false);
} else {
_tokenPos = _counter.getPosition();
if (ctx == null) {
if (_currToken == JsonToken.END_OBJECT) {
// end of input
return null;
}
throw new JsonParseException("Found element outside the document", getTokenLocation());
}
if (ctx.state == State.DONE) {
// next field
ctx.reset();
}
boolean readValue = true;
if (ctx.state == State.FIELDNAME) {
readValue = false;
while (true) {
// read field name or end of document
ctx.type = _in.readByte();
if (ctx.type == BsonConstants.TYPE_END) {
// end of document
_currToken = (ctx.array ? JsonToken.END_ARRAY : JsonToken.END_OBJECT);
_contexts.pop();
} else if (ctx.type == BsonConstants.TYPE_UNDEFINED) {
// skip field name and then ignore this token
skipCString();
continue;
} else {
ctx.state = State.VALUE;
_currToken = JsonToken.FIELD_NAME;
if (ctx.array) {
// immediately read value of array element (discard field name)
readValue = true;
skipCString();
ctx.fieldName = null;
} else {
// read field name
ctx.fieldName = readCString();
}
}
break;
}
}
if (readValue) {
// parse element's value
switch (ctx.type) {
case BsonConstants.TYPE_DOUBLE:
ctx.value = _in.readDouble();
_currToken = JsonToken.VALUE_NUMBER_FLOAT;
break;
case BsonConstants.TYPE_STRING:
ctx.value = readString();
_currToken = JsonToken.VALUE_STRING;
break;
case BsonConstants.TYPE_DOCUMENT:
_currToken = handleNewDocument(false);
break;
case BsonConstants.TYPE_ARRAY:
_currToken = handleNewDocument(true);
break;
case BsonConstants.TYPE_BINARY:
_currToken = handleBinary();
break;
case BsonConstants.TYPE_OBJECTID:
ctx.value = readObjectId();
_currToken = JsonToken.VALUE_EMBEDDED_OBJECT;
break;
case BsonConstants.TYPE_BOOLEAN:
boolean b = _in.readBoolean();
ctx.value = b;
_currToken = (b ? JsonToken.VALUE_TRUE : JsonToken.VALUE_FALSE);
break;
case BsonConstants.TYPE_DATETIME:
ctx.value = new Date(_in.readLong());
_currToken = JsonToken.VALUE_EMBEDDED_OBJECT;
break;
case BsonConstants.TYPE_NULL:
_currToken = JsonToken.VALUE_NULL;
break;
case BsonConstants.TYPE_REGEX:
_currToken = handleRegEx();
break;
case BsonConstants.TYPE_DBPOINTER:
_currToken = handleDBPointer();
break;
case BsonConstants.TYPE_JAVASCRIPT:
ctx.value = new JavaScript(readString());
_currToken = JsonToken.VALUE_EMBEDDED_OBJECT;
break;
case BsonConstants.TYPE_SYMBOL:
ctx.value = readSymbol();
_currToken = JsonToken.VALUE_EMBEDDED_OBJECT;
break;
case BsonConstants.TYPE_JAVASCRIPT_WITH_SCOPE:
_currToken = handleJavascriptWithScope();
break;
case BsonConstants.TYPE_INT32:
ctx.value = _in.readInt();
_currToken = JsonToken.VALUE_NUMBER_INT;
break;
case BsonConstants.TYPE_TIMESTAMP:
ctx.value = readTimestamp();
_currToken = JsonToken.VALUE_EMBEDDED_OBJECT;
break;
case BsonConstants.TYPE_INT64:
ctx.value = _in.readLong();
_currToken = JsonToken.VALUE_NUMBER_INT;
break;
case BsonConstants.TYPE_MINKEY:
ctx.value = "MinKey";
_currToken = JsonToken.VALUE_STRING;
break;
case BsonConstants.TYPE_MAXKEY:
ctx.value = "MaxKey";
_currToken = JsonToken.VALUE_STRING;
break;
default:
throw new JsonParseException("Unknown element type " + ctx.type, getTokenLocation());
}
ctx.state = State.DONE;
}
}
return _currToken;
}