org.bson.json

Class JsonScanner

java.lang.Object

org.bson.json.JsonScanner

class JsonScanner
extends java.lang.Object

Parses the string representation of a JSON object into a set of JsonToken-derived objects.

Since:

3.0

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	JsonScanner.NumberState
private static class	JsonScanner.RegularExpressionState

Field Summary

Fields

Modifier and Type	Field and Description
private JsonBuffer	buffer

Constructor Summary

Constructors

Constructor and Description
JsonScanner(JsonBuffer buffer) Constructs a a new JSONScanner that produces values scanned from specified JSONBuffer.
JsonScanner(java.lang.String json) Constructs a a new JSONScanner that produces values scanned from the specified String.

Method Summary

Modifier and Type	Method and Description
int	getBufferPosition()
JsonToken	nextToken() Finds and returns the next complete token from this scanner.
private JsonToken	scanNumber(char firstChar) Reads number token from source.
private JsonToken	scanRegularExpression() Reads RegularExpressionToken from source.
private JsonToken	scanString(char quoteCharacter) Reads StringToken from source.
private JsonToken	scanUnquotedString() Reads StringToken from source.
void	setBufferPosition(int newPosition)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

buffer

private final JsonBuffer buffer

Constructor Detail

JsonScanner

public JsonScanner(JsonBuffer buffer)

Constructs a a new JSONScanner that produces values scanned from specified JSONBuffer.

Parameters:

buffer - A buffer to be scanned.

JsonScanner

public JsonScanner(java.lang.String json)

Constructs a a new JSONScanner that produces values scanned from the specified String.

Parameters:

json - A string representation of a JSON to be scanned.

Method Detail

setBufferPosition

public void setBufferPosition(int newPosition)

Parameters:

newPosition - the new position of the cursor position in the buffer

getBufferPosition

public int getBufferPosition()

Returns:

the current location of the cursor in the buffer

nextToken

public JsonToken nextToken()

Finds and returns the next complete token from this scanner. If scanner reached the end of the source, it will return a token with JSONTokenType.END_OF_FILE type.

Returns:

The next token.

Throws:

JsonParseException - if source is invalid.

scanRegularExpression

private JsonToken scanRegularExpression()

Reads RegularExpressionToken from source. The following variants of lexemes are possible:

  /pattern/
  /\(pattern\)/
  /pattern/ims
 

Options can include 'i','m','x','s'

Returns:

The regular expression token.

Throws:

JsonParseException - if regular expression representation is not valid.

scanUnquotedString

private JsonToken scanUnquotedString()

Reads StringToken from source.

Returns:

The string token.

scanNumber

private JsonToken scanNumber(char firstChar)

Reads number token from source. The following variants of lexemes are possible:

  12
  123
  -0
  -345
  -0.0
  0e1
  0e-1
  -0e-1
  1e12
  -Infinity
 

Returns:

The number token.

Throws:

JsonParseException - if number representation is invalid.

scanString

private JsonToken scanString(char quoteCharacter)

Reads StringToken from source.

Returns:

The string token.