FastQueue (ANTLR 3 Runtime 3.5.3 API)

java.lang.Object
- org.antlr.runtime.misc.FastQueue<T>

Direct Known Subclasses:

LookaheadStream
```
public class FastQueue<T>
extends Object
```
A queue that can dequeue and get(i) in O(1) and grow arbitrarily large. A linked list is fast at dequeue but slow at get(i). An array is the reverse. This is O(1) for both operations. List grows until you dequeue last element at end of buffer. Then it resets to start filling at 0 again. If adds/removes are balanced, the buffer will not grow too large. No iterator stuff as that's not how we'll use it.

Field Summary

Fields
Modifier and Type Field Description

protected List<T> data
dynamically-sized buffer of elements

protected int p
index of next element to fill

protected int range

Constructor Summary

Constructors
Constructor Description

FastQueue()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(T o)`
`void`	`clear()`
`T`	`elementAt(int i)`	Return element `i` elements ahead of current element.
`T`	`head()`
`int`	`range()`
`T`	`remove()`	Get and remove first element in queue
`void`	`reset()`
`int`	`size()`
`String`	`toString()`	Return string of current buffer contents; non-destructive

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - data
```
protected List<T> data
```
    dynamically-sized buffer of elements
  - p
```
protected int p
```
    index of next element to fill
  - range
```
protected int range
```
- Constructor Detail
  - FastQueue
```
public FastQueue()
```
- Method Detail
  - reset
```
public void reset()
```
  - clear
```
public void clear()
```
  - remove
```
public T remove()
```
    Get and remove first element in queue
  - add
```
public void add(T o)
```
  - size
```
public int size()
```
  - range
```
public int range()
```
  - head
```
public T head()
```
  - elementAt
```
public T elementAt(int i)
```
    Return element i elements ahead of current element. i==0 gets current element. This is not an absolute index into data since p defines the start of the real list.
  - toString
```
public String toString()
```
    Return string of current buffer contents; non-destructive
    
    Overrides:
    
    toString in class Object