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Java Source Code / Java Documentation » Web Server » Quadcap Web Server » com.quadcap.util 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   com.quadcap.util.DList

All known Subclasses:   com.quadcap.util.Queue,
DList
public class DList (Code)
This class manages a doubly linked list, with head and tail. It's actually implemented as a circular list, with a single head pointer, and the tail is head.prev.

It would be good to have list primitives that worked well moving items from one list to another. moveFront(), in particular, should be able to splice an object out of one list and put it at the front of a different list.


author:
   Stan Bailes



Field Summary
 DListItemhead
     The head of the list, null if the list is empty.
 intsize
     The number of entries in the list.

Constructor Summary
public  DList()
     Construct an empty DList.

Method Summary
public  voidaddAfter(DListItem d, Object obj)
     Add an object after an existing list item.
public  DListItemaddBack(Object obj)
     Add an object to the back of the list.
final  voidaddBack(DListItem d)
    
public  voidaddBefore(DListItem d, Object obj)
     Add an object before an existing list item.
public  DListItemaddFront(Object obj)
     Add an object to the front of the list.
final  voidaddFront(DListItem d)
    
public  Enumerationelements()
     Return an enumeration of all of the items in this list.
public  DListItemhead()
     Access the object at the front of the list.
final public  voidmoveFront(DListItem d)
     Move the specified item, which is assumed to be already in the list, to the front of this list.
public  DListItempopBack()
     Remove and return the item at the back of the list.
public  DListItempopFront()
     Remove and return the item at the front of the list.
public  voidresize(int newsize)
     Make the DList a specified size, adding null entries or deleting tail entries.
public  voidshow(PrintWriter os, String delim)
     This method displays a list on the specified output stream.
public  voidshow(PrintStream os)
     This method displays a list using commas as delimiters.
public  voidshow(PrintWriter os)
     This method displays a list using commas as delimiters.
public  intsize()
     Return the number of items in the list.
public  DListItemtail()
     Access the object at the back of the list.
public  StringtoString()
     This method returns a string containing the display representation of this list.
final public  voidunlink(DListItem d)
    

Field Detail
head
DListItem head(Code)
The head of the list, null if the list is empty. Also, an indirect pointer to the tail of the list, since the list is linked circularly.



size
int size(Code)
The number of entries in the list. We are careful to track the size accurately.




Constructor Detail
DList
public DList()(Code)
Construct an empty DList.




Method Detail
addAfter
public void addAfter(DListItem d, Object obj)(Code)
Add an object after an existing list item.
Parameters:
  d - the item after which the object is added
Parameters:
  obj - the object to add



addBack
public DListItem addBack(Object obj)(Code)
Add an object to the back of the list.
Parameters:
  obj - the object to add



addBack
final void addBack(DListItem d)(Code)



addBefore
public void addBefore(DListItem d, Object obj)(Code)
Add an object before an existing list item.
Parameters:
  d - the item before which the object is added
Parameters:
  obj - the object to add



addFront
public DListItem addFront(Object obj)(Code)
Add an object to the front of the list.
Parameters:
  obj - the object to add



addFront
final void addFront(DListItem d)(Code)



elements
public Enumeration elements()(Code)
Return an enumeration of all of the items in this list.



head
public DListItem head() throws ListException(Code)
Access the object at the front of the list. Throw an exception if the list is empty. the item at the head of the list



moveFront
final public void moveFront(DListItem d)(Code)
Move the specified item, which is assumed to be already in the list, to the front of this list.
Parameters:
  d - the item to be placed at the front of this list.



popBack
public DListItem popBack() throws ListException(Code)
Remove and return the item at the back of the list. the item at the tail of the list



popFront
public DListItem popFront() throws ListException(Code)
Remove and return the item at the front of the list. the item at the head of the list



resize
public void resize(int newsize)(Code)
Make the DList a specified size, adding null entries or deleting tail entries.
Parameters:
  newsize - the new size of the list



show
public void show(PrintWriter os, String delim)(Code)
This method displays a list on the specified output stream.



show
public void show(PrintStream os)(Code)
This method displays a list using commas as delimiters.
Parameters:
  os - the PrintStream on which to display this list.



show
public void show(PrintWriter os)(Code)
This method displays a list using commas as delimiters.
Parameters:
  os - the PrintWriter on which to display this list.



size
public int size()(Code)
Return the number of items in the list. the list's size



tail
public DListItem tail() throws ListException(Code)
Access the object at the back of the list. Throw an exception if the list is empty. the item at the tail of the list



toString
public String toString()(Code)
This method returns a string containing the display representation of this list.



unlink
final public void unlink(DListItem d)(Code)



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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