com.partnersoft.data
Class DataBuffer

java.lang.Object
  com.partnersoft.data.DataBuffer

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

ByteBuffer, CharBuffer, DoubleBuffer, FloatBuffer, IntBuffer, LongBuffer, ObjectBuffer, PolylineArray, ShortBuffer, StringDataBuffer, StringTable

public abstract class DataBuffer
extends java.lang.Object
implements java.io.Serializable

Abstract superclass for fast, unsafe arrays or buffers of things that need to grow.

Author:

Paul Reavis Copyright 2002 Partner Software, Inc.

See Also:

Serialized Form

Field Summary

java.lang.Object	arrayObject
int	capacity
int	end
int	growthCap
int	growthMin
int	start Extents of valid data.

Constructor Summary

DataBuffer()

DataBuffer(int size)
Creates a char buffer of the given size.

Method Summary

void	append(DataBuffer nother)
void	clear()
java.lang.Object	clone()
void	copy(int oldIndex, int newIndex, int size) Copies range of contents to new spot in array.
void	copyTo(java.lang.Object notherArray)
int	getSize()
void	insert(int whereAt) Inserts a slot in the array, copying contents up one.
boolean	isEmpty()
void	makeRoomFor(int roomNeeded) This method ensures that there is enough space in the array to fill with the given number of items.
void	makeRoomFor(int roomNeeded, int minimumIncrease) Same as shorter makeRoomFor, except that it will increase the capacity at least as much as the given minimum - this prevents constant microgrowage.
abstract void	newArray(int size) Allocates a new, empty array of the given size and assign it to the arrayObject property.
void	pack()
void	remove(int whereAt)
void	setToMatch(DataBuffer nother)
DataBuffer	subsection(int sectionStart, int sectionEnd) Returns a subsection of the array.
void	tidy()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

start

public int start

Extents of valid data. Valid data is in range [start, end], inclusive. Capacity is size of actual array. The actual array, since it may consist of primitives, is subclass dependent.

end

public int end

capacity

public int capacity

arrayObject

public java.lang.Object arrayObject

growthMin

public int growthMin

growthCap

public int growthCap

Constructor Detail

DataBuffer

public DataBuffer()

DataBuffer

public DataBuffer(int size)

Creates a char buffer of the given size.

Method Detail

newArray

public abstract void newArray(int size)

Allocates a new, empty array of the given size and assign it to the arrayObject property. It is assumed that subclasses will also set it to a variable of the correct class (e.g. char[]) for ease of access as well. Copying of existing contents is managed by this superclass.

makeRoomFor

public void makeRoomFor(int roomNeeded)

This method ensures that there is enough space in the array to fill with the given number of items. The current contents are preserved, though they are moved to the beginning of the buffer if necessary. If there is already enough room (capacity - end - 1 > roomNeeded) nothing is done. Otherwise, it tries to make enough room by moving the contents to the beginning and enlarging the buffer if necessary.

makeRoomFor

public void makeRoomFor(int roomNeeded,
                        int minimumIncrease)

Same as shorter makeRoomFor, except that it will increase the capacity at least as much as the given minimum - this prevents constant microgrowage.

pack

public void pack()

tidy

public void tidy()

clear

public void clear()

getSize

public int getSize()

isEmpty

public boolean isEmpty()

copy

public void copy(int oldIndex,
                 int newIndex,
                 int size)

Copies range of contents to new spot in array. Increases capacity if needed but does not change start or end.

insert

public void insert(int whereAt)

Inserts a slot in the array, copying contents up one. Increments end but does not blank out slot.

remove

public void remove(int whereAt)

subsection

public DataBuffer subsection(int sectionStart,
                             int sectionEnd)

Returns a subsection of the array. Start and end indices are as counted from this.start, not absolute.

setToMatch

public void setToMatch(DataBuffer nother)

append

public void append(DataBuffer nother)

copyTo

public void copyTo(java.lang.Object notherArray)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

clone

public java.lang.Object clone()

Overrides:

clone in class java.lang.Object