grammarscope.io.read

Class AbstractTokenizer<T>

java.lang.Object

grammarscope.io.read.AbstractTokenizer<T>

All Implemented Interfaces:

Tokenizer<T>, java.util.Iterator<T>

Direct Known Subclasses:

TokenizerAdapter

public abstract class AbstractTokenizer<T>
extends java.lang.Object
implements Tokenizer<T>

An abstract tokenizer. Tokenizers extending AbstractTokenizer need only implement the getNext() method. This implementation does not allow null tokens, since null is used in the protected nextToken field to signify that no more tokens are available.

Author:

Teg Grenager (grenager@stanford.edu)

Field Summary

Fields

Modifier and Type	Field and Description
protected T	nextToken

Constructor Summary

Constructors

Constructor and Description
AbstractTokenizer()

Method Summary

Modifier and Type	Method and Description
protected abstract T	getNext() Internally fetches the next token.
boolean	hasNext() Returns true if this Tokenizer has more elements.
T	next() Returns the next token from this Tokenizer.
T	peek() This is an optional operation, by default supported.
void	remove() This is an optional operation, by default not supported.
java.util.List<T>	tokenize() Returns text as a List of tokens.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Field Detail

nextToken

protected T nextToken

Constructor Detail

AbstractTokenizer

public AbstractTokenizer()

Method Detail

getNext

protected abstract T getNext()

Internally fetches the next token.

Returns:

the next token in the token stream, or null if none exists.

next

public T next()

Returns the next token from this Tokenizer.

Specified by:

next in interface Tokenizer<T>

Specified by:

next in interface java.util.Iterator<T>

Returns:

the next token in the token stream.

Throws:

java.util.NoSuchElementException - if the token stream has no more tokens.

hasNext

public boolean hasNext()

Returns true if this Tokenizer has more elements.

Specified by:

hasNext in interface Tokenizer<T>

Specified by:

hasNext in interface java.util.Iterator<T>

remove

public void remove()

This is an optional operation, by default not supported.

Specified by:

remove in interface Tokenizer<T>

Specified by:

remove in interface java.util.Iterator<T>

peek

public T peek()

This is an optional operation, by default supported.

Specified by:

peek in interface Tokenizer<T>

Returns:

The next token in the token stream.

Throws:

java.util.NoSuchElementException - if the token stream has no more tokens.

tokenize

public java.util.List<T> tokenize()

Returns text as a List of tokens.

Specified by:

tokenize in interface Tokenizer<T>

Returns:

A list of all tokens remaining in the underlying Reader