org.apache.xml.utils
Class SuballocatedByteVector
java.lang.Object
org.apache.xml.utils.SuballocatedByteVector
public class SuballocatedByteVector
extends java.lang.Object
A very simple table that stores a list of byte. Very similar API to our
IntVector class (same API); different internal storage.
This version uses an array-of-arrays solution. Read/write access is thus
a bit slower than the simple IntVector, and basic storage is a trifle
higher due to the top-level array -- but appending is O(1) fast rather
than O(N**2) slow, which will swamp those costs in situations where
long vectors are being built up.
Known issues:
Some methods are private because they haven't yet been tested properly.
If an element has not been set (because we skipped it), its value will
initially be 0. Shortening the vector does not clear old storage; if you
then skip values and setElementAt a higher index again, you may see old data
reappear in the truncated-and-restored section. Doing anything else would
have performance costs.
void | addElement(byte value) - Append a byte onto the vector.
|
byte | elementAt(int i) - Get the nth element.
|
int | indexOf(byte elem) - Searches for the first occurence of the given argument,
beginning the search at index, and testing for equality
using the equals method.
|
int | indexOf(byte elem, int index) - Searches for the first occurence of the given argument,
beginning the search at index, and testing for equality
using the equals method.
|
void | removeAllElements() - Wipe it out.
|
void | setElementAt(byte value, int at) - Sets the component at the specified index of this vector to be the
specified object.
|
int | size() - Get the length of the list.
|
SuballocatedByteVector
public SuballocatedByteVector()
Default constructor. Note that the default
block size is very small, for small lists.
SuballocatedByteVector
public SuballocatedByteVector(int blocksize)
Construct a ByteVector, using the given block size.
blocksize
- Size of block to allocate
SuballocatedByteVector
public SuballocatedByteVector(int blocksize,
int increaseSize)
Construct a ByteVector, using the given block size.
blocksize
- Size of block to allocate
addElement
public void addElement(byte value)
Append a byte onto the vector.
value
- Byte to add to the list
elementAt
public byte elementAt(int i)
Get the nth element. This is often at the innermost loop of an
application, so performance is critical.
i
- index of value to get
- value at given index. If that value wasn't previously set,
the result is undefined for performance reasons. It may throw an
exception (see below), may return zero, or (if setSize has previously
been used) may return stale data.
indexOf
public int indexOf(byte elem)
Searches for the first occurence of the given argument,
beginning the search at index, and testing for equality
using the equals method.
elem
- object to look for
- the index of the first occurrence of the object
argument in this vector at position index or later in the
vector; returns -1 if the object is not found.
indexOf
public int indexOf(byte elem,
int index)
Searches for the first occurence of the given argument,
beginning the search at index, and testing for equality
using the equals method.
elem
- object to look forindex
- Index of where to begin search
- the index of the first occurrence of the object
argument in this vector at position index or later in the
vector; returns -1 if the object is not found.
removeAllElements
public void removeAllElements()
Wipe it out.
setElementAt
public void setElementAt(byte value,
int at)
Sets the component at the specified index of this vector to be the
specified object. The previous component at that position is discarded.
The index must be a value greater than or equal to 0 and less
than the current size of the vector.
value
- at
- Index of where to set the object
size
public int size()
Get the length of the list.
Copyright B) 2006 Apache XML Project. All Rights Reserved.