org.htmlparser.lexer
Class PageIndex

java.lang.Object
  org.htmlparser.lexer.PageIndex

All Implemented Interfaces:

Serializable, Sortable

public class PageIndex
extends Object
implements Serializable, Sortable

A sorted array of integers, the positions of the first characters of each line. To facilitate processing the first element should be maintained at position 0. Facilities to add, remove, search and determine row and column are provided. This class provides similar functionality to a Vector but does not incur the overhead of an Integer object per element.

See Also:

Serialized Form

Field Summary

protected int	mCount The number of valid elements.
protected int	mIncrement Increment for allocations.
protected int[]	mIndices The elements.
protected Page	mPage The page associated with this index.
protected static int	mStartIncrement Starting increment for allocations.

Constructor Summary

PageIndex(Page page)
Create an empty index.

PageIndex(Page page, int cursor)
Create an index with the one element given.

PageIndex(Page page, int[] cursors)
Create an index with the elements given.

Method Summary

int	add(Cursor cursor) Add an element to the list
int	add(int cursor) Add an element to the list
protected int	bsearch(int cursor) Binary search for the element.
protected int	bsearch(int cursor, int first, int last) Binary search for the element.
int	capacity() Get the capacity for elements without reallocation.
int	column(Cursor cursor) Get the column number for a cursor.
int	column(int cursor) Get the column number for a position.
int	elementAt(int index) Get an element from the list.
Ordered	fetch(int index, Ordered reuse) Fetch the object at the given index.
int	first() Returns the first index of the Sortable.
int[]	get() Get the elements as an array of int.
Page	getPage() Get this index's page.
protected void	insertElementAt(int cursor, int index) Inserts an element into the list.
int	last() Returns the last index of the Sortable.
void	remove(Cursor cursor) Remove an element from the list
void	remove(int cursor) Remove an element from the list
protected void	removeElementAt(int index) Remove an element from the list.
int	row(Cursor cursor) Get the line number for a cursor.
int	row(int cursor) Get the line number for a position.
int	size() Get the count of elements.
void	swap(int i, int j) Swaps the elements at the given indicies.

Methods inherited from class java.lang.Object

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

Field Detail

mStartIncrement

protected static final int mStartIncrement

Starting increment for allocations.

See Also:

Constant Field Values

mIncrement

protected int mIncrement

Increment for allocations.

mCount

protected int mCount

The number of valid elements.

mIndices

protected int[] mIndices

The elements.

mPage

protected Page mPage

The page associated with this index.

Constructor Detail

PageIndex

public PageIndex(Page page)

Create an empty index.

Parameters:

page - The page associated with this index.

PageIndex

public PageIndex(Page page,
                 int cursor)

Create an index with the one element given.

Parameters:

page - The page associated with this index.

cursor - The single element for the new index.

PageIndex

public PageIndex(Page page,
                 int[] cursors)

Create an index with the elements given.

Parameters:

page - The page associated with this index.

cursors - The initial elements of the index. NOTE: The list must be sorted in ascending order.

Method Detail

getPage

public Page getPage()

Get this index's page.

Returns:

The page associated with this index.

size

public int size()

Get the count of elements.

Returns:

The number of valid elements.

capacity

public int capacity()

Get the capacity for elements without reallocation.

Returns:

The number of spaces for elements.

add

public int add(Cursor cursor)

Add an element to the list

Parameters:

cursor - The element to add.

Returns:

The position at which the element was inserted or the index of the existing element if it is a duplicate.

add

public int add(int cursor)

Add an element to the list

Parameters:

cursor - The element to add.

Returns:

The position at which the element was inserted or the index of the existing element if it is a duplicate.

remove

public void remove(Cursor cursor)

Remove an element from the list

Parameters:

cursor - The element to remove.

remove

public void remove(int cursor)

Remove an element from the list

Parameters:

cursor - The element to remove.

elementAt

public int elementAt(int index)

Get an element from the list.

Parameters:

index - The index of the element to get.

Returns:

The element.

row

public int row(Cursor cursor)

Get the line number for a cursor.

Parameters:

cursor - The character offset into the page.

Returns:

The line number the character is in.

row

public int row(int cursor)

Get the line number for a position.

Parameters:

cursor - The character offset into the page.

Returns:

The line number the character is in.

column

public int column(Cursor cursor)

Get the column number for a cursor.

Parameters:

cursor - The character offset into the page.

Returns:

The character offset into the line this cursor is on.

column

public int column(int cursor)

Get the column number for a position.

Parameters:

cursor - The character offset into the page.

Returns:

The character offset into the line this cursor is on.

get

public int[] get()

Get the elements as an array of int.

Returns:

A new array containing the elements, i.e. a snapshot of the index.

bsearch

protected int bsearch(int cursor)

Binary search for the element.

Parameters:

cursor - The element to search for.

Returns:

The index at which the element was found or is to be inserted.

bsearch

protected int bsearch(int cursor,
                      int first,
                      int last)

Binary search for the element.

Parameters:

cursor - The element to search for.

first - The index to start at.

last - The index to stop at.

Returns:

The index at which the element was found or is to be inserted.

insertElementAt

protected void insertElementAt(int cursor,
                               int index)

Inserts an element into the list. The index must be a value greater than or equal to 0 and less than or equal to the current size of the array.

Parameters:

cursor - The element to insert.

index - The index in the list to insert it at.

removeElementAt

protected void removeElementAt(int index)

Remove an element from the list.

Parameters:

index - The index of the item to remove.

first

public int first()

Returns the first index of the Sortable.

Specified by:

first in interface Sortable

Returns:

The index of the first element.

last

public int last()

Returns the last index of the Sortable.

Specified by:

last in interface Sortable

Returns:

The index of the last element. If this were an array object this would be (object.length - 1). For an empty index this will return -1.

fetch

public Ordered fetch(int index,
                     Ordered reuse)

Fetch the object at the given index.

Specified by:

fetch in interface Sortable

Parameters:

index - The item number to get.

reuse - If this argument is not null, it is an object acquired from a previous fetch that is no longer needed and may be returned as the result if it makes mores sense to alter and return it than to fetch or create a new element. That is, the reuse object is garbage and may be used to avoid allocating a new object if that would normally be the strategy.

Returns:

The Ordered object at that index.

swap

public void swap(int i,
                 int j)

Swaps the elements at the given indicies.

Specified by:

swap in interface Sortable

Parameters:

i - One index.

j - The other index.