| 7 |
|
#ifndef _NullNode_hpp_ |
| 8 |
|
#define _NullNode_hpp_ |
| 9 |
|
|
| 10 |
< |
#include "Node.hpp" |
| 10 |
> |
#include "Visitor.hpp" |
| 11 |
|
|
| 12 |
|
template<typename Type> |
| 13 |
< |
class NullNode : public Node<Type> |
| 13 |
> |
class NullNode |
| 14 |
|
{ |
| 15 |
|
private: |
| 16 |
+ |
Type value; |
| 17 |
+ |
NullNode<Type>* next; |
| 18 |
+ |
NullNode<Type>* previous; |
| 19 |
|
bool null; |
| 20 |
|
public: |
| 21 |
|
NullNode() : null(true) {} |
| 22 |
< |
NullNode(const Type& value) : Node<Type>::Node(value), null(false) {} |
| 23 |
< |
~NullNode() {} |
| 24 |
< |
bool contains(const Type& value, NullNode<Type>* end); |
| 22 |
> |
NullNode(const Type& value) : value(value), null(false) {} |
| 23 |
> |
void setValue(const Type& value) { this->value = value; } |
| 24 |
> |
const Type& getValue(void) const { return value; } |
| 25 |
> |
void addNext(const Type& value); |
| 26 |
> |
void addPrevious(const Type& value); |
| 27 |
> |
void removeNext(void); |
| 28 |
> |
void removePrevious(void); |
| 29 |
> |
void setNext(NullNode<Type>* next) { this->next = next; } |
| 30 |
> |
void setPrevious(NullNode<Type>* previous) { this->previous = previous; } |
| 31 |
> |
NullNode<Type>* getNext(void) const { return next; } |
| 32 |
> |
NullNode<Type>* getPrevious(void) const { return next; } |
| 33 |
> |
bool contains(const Type& value, NullNode<Type>* end, bool forward = true); |
| 34 |
> |
void remove(const Type& value, NullNode<Type>* end, bool forward = true); |
| 35 |
> |
void accept(Visitor<Type>* visitor, NullNode<Type>* end, bool forward = true); |
| 36 |
|
}; |
| 37 |
|
|
| 38 |
|
template<typename Type> |
| 39 |
< |
bool NullNode<Type>::contains(const Type& value, NullNode<Type>* end) |
| 39 |
> |
void NullNode<Type>::addNext(const Type& value) |
| 40 |
|
{ |
| 41 |
< |
NullNode<Type>* another = Node<Type>::getNext() != NULL ? |
| 42 |
< |
Node<Type>::getNext() : Node<Type>::getPrevious(); |
| 41 |
> |
NullNode<Type>* behind = next; |
| 42 |
> |
|
| 43 |
> |
next = new NullNode<Type>(value); |
| 44 |
> |
next->previous = this; |
| 45 |
> |
next->next = behind; |
| 46 |
> |
behind->previous = next; |
| 47 |
> |
} |
| 48 |
> |
|
| 49 |
> |
template<typename Type> |
| 50 |
> |
void NullNode<Type>::addPrevious(const Type& value) |
| 51 |
> |
{ |
| 52 |
> |
NullNode<Type>* ahead = previous; |
| 53 |
> |
|
| 54 |
> |
previous = new NullNode<Type>(value); |
| 55 |
> |
previous->next = this; |
| 56 |
> |
previous->previous = ahead; |
| 57 |
> |
ahead->next = previous; |
| 58 |
> |
} |
| 59 |
> |
|
| 60 |
> |
template<typename Type> |
| 61 |
> |
void NullNode<Type>::removeNext(void) |
| 62 |
> |
{ |
| 63 |
> |
NullNode<Type>* behind = next->next; |
| 64 |
> |
|
| 65 |
> |
delete next; |
| 66 |
> |
|
| 67 |
> |
next = behind; |
| 68 |
> |
next->previous = this; |
| 69 |
> |
} |
| 70 |
> |
|
| 71 |
> |
template<typename Type> |
| 72 |
> |
void NullNode<Type>::removePrevious(void) |
| 73 |
> |
{ |
| 74 |
> |
NullNode<Type>* ahead = previous->previous; |
| 75 |
> |
|
| 76 |
> |
delete previous; |
| 77 |
> |
|
| 78 |
> |
previous = ahead; |
| 79 |
> |
previous->next = this; |
| 80 |
> |
} |
| 81 |
> |
|
| 82 |
> |
template<typename Type> |
| 83 |
> |
bool NullNode<Type>::contains(const Type& value, NullNode<Type>* end, bool forward) |
| 84 |
> |
{ |
| 85 |
> |
NullNode<Type>* another = forward ? next : previous; |
| 86 |
|
|
| 87 |
|
if (null && end == this) |
| 88 |
|
{ |
| 89 |
|
return false; |
| 90 |
|
} |
| 91 |
< |
else if (!null && value == Node<Type>::getValue()) |
| 91 |
> |
else if (!null && value == this->value) |
| 92 |
|
{ |
| 93 |
|
return true; |
| 94 |
|
} |
| 95 |
|
else return another->contains(value, end); |
| 96 |
|
} |
| 97 |
|
|
| 98 |
+ |
template<typename Type> |
| 99 |
+ |
void NullNode<Type>::remove(const Type& value, NullNode<Type>* end, bool forward) |
| 100 |
+ |
{ |
| 101 |
+ |
NullNode<Type>* another = forward ? next : previous; |
| 102 |
+ |
|
| 103 |
+ |
if (!null && value == this->value) |
| 104 |
+ |
{ |
| 105 |
+ |
next->previous = previous; |
| 106 |
+ |
previous->next = next; |
| 107 |
+ |
|
| 108 |
+ |
delete this; |
| 109 |
+ |
} |
| 110 |
+ |
else if (end != this) another->remove(value, end, forward); |
| 111 |
+ |
} |
| 112 |
+ |
|
| 113 |
+ |
template<typename Type> |
| 114 |
+ |
void NullNode<Type>::accept(Visitor<Type>* visitor, NullNode<Type>* end, bool forward) |
| 115 |
+ |
{ |
| 116 |
+ |
NullNode<Type>* another = forward ? next : previous; |
| 117 |
+ |
|
| 118 |
+ |
if (!null) visitor->visit(value); |
| 119 |
+ |
|
| 120 |
+ |
if (end != this) another->accept(visitor, end, forward); |
| 121 |
+ |
} |
| 122 |
+ |
|
| 123 |
|
#endif // _NullNode_hpp_ |
