| 1 |
Douglas Thrift |
1 |
// Null Node |
| 2 |
|
|
// |
| 3 |
|
|
// Douglas Thrift |
| 4 |
|
|
// |
| 5 |
|
|
// $Id$ |
| 6 |
|
|
|
| 7 |
|
|
#ifndef _NullNode_hpp_ |
| 8 |
|
|
#define _NullNode_hpp_ |
| 9 |
|
|
|
| 10 |
Douglas Thrift |
4 |
template<typename Type> |
| 11 |
Douglas Thrift |
5 |
class NullNode |
| 12 |
Douglas Thrift |
1 |
{ |
| 13 |
|
|
private: |
| 14 |
Douglas Thrift |
5 |
Type value; |
| 15 |
|
|
NullNode<Type>* next; |
| 16 |
|
|
NullNode<Type>* previous; |
| 17 |
Douglas Thrift |
1 |
bool null; |
| 18 |
|
|
public: |
| 19 |
Douglas Thrift |
5 |
NullNode() : next(NULL), previous(NULL), null(true) {} |
| 20 |
Douglas Thrift |
6 |
NullNode(const Type& value) : value(value), next(NULL), previous(NULL), null(false) {} |
| 21 |
Douglas Thrift |
1 |
~NullNode() {} |
| 22 |
Douglas Thrift |
5 |
void setValue(const Type& value) { this->value = value; } |
| 23 |
|
|
const Type& getValue(void) const { return value; } |
| 24 |
|
|
void addNext(const Type& value); |
| 25 |
|
|
void addPrevious(const Type& value); |
| 26 |
|
|
void removeNext(void); |
| 27 |
|
|
void removePrevious(void); |
| 28 |
|
|
void setNext(NullNode<Type>* next) { this->next = next; } |
| 29 |
|
|
void setPrevious(NullNode<Type>* previous) { this->previous = previous; } |
| 30 |
|
|
NullNode<Type>* getNext(void) const { return next; } |
| 31 |
|
|
NullNode<Type>* getPrevious(void) const { return next; } |
| 32 |
Douglas Thrift |
6 |
bool contains(const Type& value, NullNode<Type>* end, bool forward = true); |
| 33 |
|
|
void remove(const Type& value, NullNode<Type>* end, bool forward = true); |
| 34 |
Douglas Thrift |
1 |
}; |
| 35 |
|
|
|
| 36 |
Douglas Thrift |
3 |
template<typename Type> |
| 37 |
Douglas Thrift |
5 |
void NullNode<Type>::addNext(const Type& value) |
| 38 |
|
|
{ |
| 39 |
|
|
NullNode<Type>* behind = next; |
| 40 |
|
|
|
| 41 |
|
|
next = new NullNode<Type>(value); |
| 42 |
|
|
next->previous = this; |
| 43 |
|
|
next->next = behind; |
| 44 |
|
|
behind->previous = next; |
| 45 |
|
|
} |
| 46 |
|
|
|
| 47 |
|
|
template<typename Type> |
| 48 |
|
|
void NullNode<Type>::addPrevious(const Type& value) |
| 49 |
|
|
{ |
| 50 |
|
|
NullNode<Type>* ahead = previous; |
| 51 |
|
|
|
| 52 |
|
|
previous = new NullNode<Type>(value); |
| 53 |
|
|
previous->next = this; |
| 54 |
|
|
previous->previous = ahead; |
| 55 |
|
|
ahead->next = previous; |
| 56 |
|
|
} |
| 57 |
|
|
|
| 58 |
|
|
template<typename Type> |
| 59 |
|
|
void NullNode<Type>::removeNext(void) |
| 60 |
|
|
{ |
| 61 |
|
|
NullNode<Type>* behind = next->next; |
| 62 |
|
|
|
| 63 |
|
|
delete next; |
| 64 |
|
|
|
| 65 |
|
|
next = behind; |
| 66 |
|
|
next->previous = this; |
| 67 |
|
|
} |
| 68 |
|
|
|
| 69 |
|
|
template<typename Type> |
| 70 |
|
|
void NullNode<Type>::removePrevious(void) |
| 71 |
|
|
{ |
| 72 |
|
|
NullNode<Type>* ahead = previous->previous; |
| 73 |
|
|
|
| 74 |
|
|
delete previous; |
| 75 |
|
|
|
| 76 |
|
|
previous = ahead; |
| 77 |
|
|
previous->next = this; |
| 78 |
|
|
} |
| 79 |
|
|
|
| 80 |
|
|
template<typename Type> |
| 81 |
Douglas Thrift |
6 |
bool NullNode<Type>::contains(const Type& value, NullNode<Type>* end, bool forward) |
| 82 |
Douglas Thrift |
3 |
{ |
| 83 |
Douglas Thrift |
6 |
NullNode<Type>* another = forward ? next : previous; |
| 84 |
Douglas Thrift |
3 |
|
| 85 |
Douglas Thrift |
4 |
if (null && end == this) |
| 86 |
|
|
{ |
| 87 |
|
|
return false; |
| 88 |
|
|
} |
| 89 |
Douglas Thrift |
5 |
else if (!null && value == this->value) |
| 90 |
Douglas Thrift |
4 |
{ |
| 91 |
|
|
return true; |
| 92 |
|
|
} |
| 93 |
|
|
else return another->contains(value, end); |
| 94 |
Douglas Thrift |
3 |
} |
| 95 |
|
|
|
| 96 |
Douglas Thrift |
6 |
template<typename Type> |
| 97 |
|
|
void NullNode<Type>::remove(const Type& value, NullNode<Type>* end, bool forward) |
| 98 |
|
|
{ |
| 99 |
|
|
NullNode<Type>* another = forward ? next : previous; |
| 100 |
|
|
|
| 101 |
|
|
if (!null && value == this->value) |
| 102 |
|
|
{ |
| 103 |
|
|
next->previous = previous; |
| 104 |
|
|
previous->next = next; |
| 105 |
|
|
|
| 106 |
|
|
delete this; |
| 107 |
|
|
} |
| 108 |
|
|
else if (end != this) another->remove(value, end, forward); |
| 109 |
|
|
} |
| 110 |
|
|
|
| 111 |
Douglas Thrift |
1 |
#endif // _NullNode_hpp_ |
