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R8218/utils/@LinkedList/LinkedList.m
71604e1d9392master

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LinkedList.m
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classdef LinkedList < handle
% Simple linked list implementation
properties (Access = private, Hidden = true)
ID
value
previous
next
end
methods
function obj = LinkedList
obj.ID = 'head';
obj.value = obj;
obj.previous = [];
obj.next = [];
end
function output = append(obj,newValue,varargin)
if nargin == 3
newID = varargin{1};
else
newID = num2str(obj.length+1);
end
newElement = LinkedList;
obj.setLastElement(newElement);
newElement.setID(newID);
newElement.setValue(newValue);
output = newID;
end
function remove(obj,IndexOrID)
element = obj.getElement(IndexOrID);
obj.removeElement(element);
end
function output = pop(obj,varargin)
element = obj.getLastElement;
if (nargin == 2)
element = obj.getElement(varargin{1});
end
output = element.value;
obj.removeElement(element);
end
function output = find(obj,ID)
element = obj.getFirstElement;
index = 1;
foundLocations = [];
if isequal(ID,element.ID)
foundLocations = [foundLocations index];
end
while not(isempty(element.next))
element = element.next;
index = index + 1;
if isequal(ID,element.ID)
foundLocations = [foundLocations index];
end
end
output = foundLocations;
end
function output = getValue(obj,IndexOrID)
element = obj.getElement(IndexOrID);
output = element.value;
end
function output = getID(obj,IndexOrID)
element = obj.getElement(IndexOrID);
output = element.ID;
end
function output = getAllValues(obj)
element = obj.getFirstElement;
output = {};
while not(isempty(element.next))
element = element.next;
output{end+1} = element.value;
end
end
function output = getAllIDs(obj)
element = obj.getFirstElement;
output = {};
while not(isempty(element.next))
element = element.next;
output{end+1} = element.ID;
end
end
function output = isEmpty(obj)
output = (obj.length == 0);
end
function output = length(obj)
element = obj.getFirstElement;
count = 0;
while not(isempty(element.next))
element = element.next;
count = count+1;
end
output = count;
end
function clear(obj)
element = obj.getFirstElement;
element.next = [];
end
end
methods (Access = private, Hidden = true)
function setID(obj,ID)
assert(ischar(ID),'ID should be a character array.')
obj.ID = ID;
end
function setValue(obj,value)
obj.value = value;
end
function setLastElement(obj,element)
lastElement = obj.getLastElement;
lastElement.next = element;
element.previous = lastElement;
end
function output = getElement(obj,IndexOrID)
if ischar(IndexOrID)
output = obj.getElementWithID(IndexOrID);
elseif isnumeric(IndexOrID)
output = obj.getElementWithIndex(IndexOrID);
end
end
function output = getElementWithID(obj,ID)
index = obj.find(ID);
assert(not(isempty(index)),'There is no element with this ID.')
index = index(1);
output = obj.getElementWithIndex(index);
end
function output = getElementWithIndex(obj,index)
assert((index >= 0),'The given element index should be greater or equal to 0.')
element = obj.getFirstElement;
for i = 2:index
assert(not(isempty(element.next)),'Index exceeds the number of list elements.')
element = element.next;
end
output = element;
end
function removeElement(obj,element)
if isequal(obj,element)
return
end
if not(isempty(element.next))
element.next.previous = element.previous;
end
element.previous.next = element.next;
end
function output = getLastElement(obj)
element = obj;
while not(isempty(element.next))
element = element.next;
end
output = element;
end
function output = getFirstElement(obj)
element = obj;
while not(isempty(element.previous))
element = element.previous;
end
output = element;
end
end
end
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