Package com.predic8.membrane.core.graphql

Class Tokenizer

java.lang.Object

com.predic8.membrane.core.graphql.Tokenizer

public class Tokenizer
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	Tokenizer.Type

Constructor Summary

Constructors

Constructor	Description
Tokenizer(InputStream reader)

Method Summary

Modifier and Type	Method	Description
boolean	advance()	Advances to next token.
double	float_()
int	integer()
void	mustAdvance()	Same as advance(), but throw EOFException if EOF is reached instead of returning a boolean.
long	position()
int	punctuator()	If type() returned PUNCTUATOR, this will return the value.
void	revert()	Undo the last advance().
String	string()	If type() returned NAME or STRING_VALUE, this will return the value.
String	tokenString()
Tokenizer.Type	type()

Methods inherited from class java.lang.Object

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

Constructor Details

Tokenizer

public Tokenizer(InputStream reader)

Method Details

revert

public void revert()

Undo the last advance().

Note that this can only be used to go *one* token back.

Also note that when this method has been called, the second-to-last token cannot actually be inspected. This method only serves the purpose to let the next parsing routine call advance() again itself. This can therefore be used to check - again - whether EOF has been reached.

mustAdvance

public void mustAdvance()
                 throws IOException,
ParsingException

Same as advance(), but throw EOFException if EOF is reached instead of returning a boolean.

Throws:

IOException

ParsingException

advance

public boolean advance()
                throws IOException,
ParsingException

Advances to next token.

Returns:

whether another token was found. ('false' signals that EOF has been reached.)

Throws:

EOFException - parsing error (EOF while parsing a token, e.g. an unclosed string)

ParsingException - parsing error (illegal text according to the grammar)

IOException

type

public Tokenizer.Type type()

punctuator

public int punctuator()

If type() returned PUNCTUATOR, this will return the value.

string

public String string()

If type() returned NAME or STRING_VALUE, this will return the value.

integer

public int integer()

float_

public double float_()

tokenString

public String tokenString()

position

public long position()