[4486] | 1 | /*! |
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[5068] | 2 | * @file list.h |
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| 3 | * a File that includes a List-template |
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| 4 | */ |
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[2636] | 5 | |
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[3224] | 6 | #ifndef _LIST_H |
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| 7 | #define _LIST_H |
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[2036] | 8 | |
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[3860] | 9 | #include "compiler.h" |
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| 10 | #ifndef NULL |
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[4499] | 11 | #define NULL 0 //!< this will define NULL |
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[3860] | 12 | #endif |
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[2036] | 13 | |
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[5110] | 14 | template<class T> class tIterator; |
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[2036] | 15 | |
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[4574] | 16 | //! a list element of the tList, |
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[3652] | 17 | template<class T> struct listElement |
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[2077] | 18 | { |
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[4488] | 19 | listElement* prev; //!< pointer to the previous listElement in the list |
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| 20 | T* curr; //!< pointer to the list payload/container |
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| 21 | listElement* next; //!< pointer to the next listElement |
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[3652] | 22 | }; |
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[2077] | 23 | |
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[4488] | 24 | /** |
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[4836] | 25 | * the list template class |
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[4497] | 26 | |
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| 27 | you will use this as a generic list for all type of objects |
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| 28 | */ |
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[4574] | 29 | template<class T> class tList |
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[2822] | 30 | { |
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[5110] | 31 | friend class tIterator<T>; |
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| 32 | |
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[2822] | 33 | public: |
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| 34 | tList (); |
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| 35 | ~tList (); |
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| 36 | |
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[3365] | 37 | void add(T* entity); |
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[5074] | 38 | void addAtBeginning(T* entity); //!< @todo This should be made with an ENUM |
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[3365] | 39 | void remove(T* entity); |
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[5068] | 40 | void removeLast(); |
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[4497] | 41 | void flush(); |
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[5103] | 42 | T* firstElement() const; |
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| 43 | T* lastElement() const; |
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| 44 | bool isEmpty() const; |
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| 45 | unsigned int getSize() const; |
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[4508] | 46 | bool inList(T* entity); |
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[5103] | 47 | tIterator<T>* getIterator() const; |
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[3585] | 48 | T* nextElement(T* toEntity); |
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[2822] | 49 | T* toArray(); |
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[3652] | 50 | |
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| 51 | private: |
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[4497] | 52 | unsigned int size; //!< the size (lenght) of the list |
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| 53 | listElement<T>* first; //!< pointer to the first element |
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| 54 | listElement<T>* last; //!< pointer to the last element |
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| 55 | listElement<T>* currentEl; //!< pointer to the current element |
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[2822] | 56 | }; |
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| 57 | |
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| 58 | |
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[4497] | 59 | /** |
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[4836] | 60 | * the constructor |
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[4497] | 61 | */ |
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[2822] | 62 | template<class T> |
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[4574] | 63 | inline tList<T>::tList () |
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[2822] | 64 | { |
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| 65 | this->first = NULL; |
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| 66 | this->last = NULL; |
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| 67 | this->size = 0; |
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| 68 | } |
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| 69 | |
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[4497] | 70 | |
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| 71 | /** |
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[4836] | 72 | * the deconstructor |
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[4497] | 73 | |
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[4574] | 74 | this will delete only the list. ATTENTION: the list is deleted, but the objects in the list will |
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[4497] | 75 | not be deleted |
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| 76 | */ |
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[2822] | 77 | template<class T> |
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[4574] | 78 | inline tList<T>::~tList () |
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[3553] | 79 | { |
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| 80 | this->currentEl = this->first; |
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| 81 | while(this->currentEl != NULL) |
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| 82 | { |
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[3652] | 83 | listElement<T>* le = this->currentEl->next; |
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[3553] | 84 | //delete this->currentEl->curr; |
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| 85 | delete this->currentEl; |
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| 86 | this->currentEl = le; |
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| 87 | } |
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| 88 | this->first = NULL; |
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| 89 | this->last = NULL; |
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| 90 | this->size = 0; |
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| 91 | } |
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[2822] | 92 | |
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[3553] | 93 | |
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[4497] | 94 | /** |
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[4836] | 95 | * add an entity to the list |
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| 96 | * @param entity: the entity to add |
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[4497] | 97 | */ |
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[2822] | 98 | template<class T> |
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[3661] | 99 | inline void tList<T>::add(T* entity) |
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[2822] | 100 | { |
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[3860] | 101 | if( unlikely(entity == NULL)) return; |
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[3652] | 102 | listElement<T>* el = new listElement<T>; |
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[2822] | 103 | el->prev = this->last; |
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| 104 | el->curr = entity; |
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| 105 | el->next = NULL; |
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| 106 | |
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| 107 | this->last = el; |
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| 108 | |
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[3860] | 109 | if( unlikely(el->prev == NULL)) this->first = el; /* if first element */ |
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[2822] | 110 | else el->prev->next = el; |
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| 111 | this->size++; |
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| 112 | } |
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| 113 | |
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[5073] | 114 | /** |
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| 115 | * add an entity to the list |
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| 116 | * @param entity: the entity to add |
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| 117 | */ |
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| 118 | template<class T> |
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[5074] | 119 | inline void tList<T>::addAtBeginning(T* entity) |
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[5073] | 120 | { |
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| 121 | if( unlikely(entity == NULL)) return; |
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| 122 | listElement<T>* el = new listElement<T>; |
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| 123 | el->next = this->first; |
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| 124 | el->curr = entity; |
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| 125 | el->prev = NULL; |
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[2822] | 126 | |
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[5073] | 127 | this->first = el; |
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| 128 | |
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| 129 | if( unlikely(el->next == NULL)) this->first = el; /* if first element */ |
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| 130 | else el->next->prev = el; |
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| 131 | this->size++; |
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| 132 | } |
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| 133 | |
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| 134 | |
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[4497] | 135 | /** |
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[4836] | 136 | * remove an entity from the list |
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| 137 | * @param entity: the entity to be removed |
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[4497] | 138 | */ |
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[2822] | 139 | template<class T> |
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[3661] | 140 | inline void tList<T>::remove(T* entity) |
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[2822] | 141 | { |
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| 142 | this->currentEl = this->first; |
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| 143 | while( this->currentEl != NULL) |
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| 144 | { |
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[3860] | 145 | if( unlikely(this->currentEl->curr == entity)) |
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[4574] | 146 | { |
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| 147 | if( unlikely(this->currentEl->prev == NULL)) this->first = this->currentEl->next; |
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| 148 | else this->currentEl->prev->next = this->currentEl->next; |
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[2822] | 149 | |
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[4574] | 150 | if( unlikely(this->currentEl->next == NULL)) this->last = this->currentEl->prev; |
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| 151 | else this->currentEl->next->prev = this->currentEl->prev; |
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[2822] | 152 | |
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[4574] | 153 | delete this->currentEl; |
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| 154 | this->size--; |
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| 155 | return; |
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| 156 | } |
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[2822] | 157 | this->currentEl = this->currentEl->next; |
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| 158 | } |
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| 159 | } |
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| 160 | |
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[5068] | 161 | /** |
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| 162 | * removes the Last Element of the List |
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| 163 | */ |
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| 164 | template<class T> |
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| 165 | inline void tList<T>::removeLast() |
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| 166 | { |
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| 167 | if (this->last == NULL) |
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| 168 | return; |
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| 169 | else if (this->last == this->first) |
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| 170 | { |
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| 171 | delete this->first; |
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| 172 | this->first = NULL; |
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| 173 | this->last = NULL; |
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| 174 | this->size--; |
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| 175 | } |
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| 176 | else |
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| 177 | { |
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| 178 | listElement<T>* delLast = this->last; |
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| 179 | this->last->prev->next = NULL; |
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| 180 | this->last = this->last->prev; |
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| 181 | delete delLast; |
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| 182 | } |
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| 183 | } |
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[2822] | 184 | |
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[4497] | 185 | /** |
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[4836] | 186 | * this will deletes the objects from the list |
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[4497] | 187 | */ |
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[2822] | 188 | template<class T> |
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[4497] | 189 | inline void tList<T>::flush() |
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[2822] | 190 | { |
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| 191 | this->currentEl = this->first; |
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| 192 | while(this->currentEl != NULL) |
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| 193 | { |
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[3652] | 194 | listElement<T>* le = this->currentEl->next; |
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[4497] | 195 | delete this->currentEl->curr; |
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[2822] | 196 | delete this->currentEl; |
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| 197 | this->currentEl = le; |
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| 198 | } |
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| 199 | this->first = NULL; |
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| 200 | this->last = NULL; |
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| 201 | this->size = 0; |
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| 202 | } |
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| 203 | |
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| 204 | |
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[4497] | 205 | /** |
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[4836] | 206 | * returns the first element of the list |
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| 207 | * @returns first element |
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[4497] | 208 | */ |
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[2822] | 209 | template<class T> |
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[5103] | 210 | inline T* tList<T>::firstElement() const |
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[2822] | 211 | { |
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| 212 | return this->first->curr; |
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| 213 | } |
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| 214 | |
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[3832] | 215 | |
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[4497] | 216 | /** |
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[4836] | 217 | * function returns the last element of the list |
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| 218 | * @returns the last element |
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[4497] | 219 | */ |
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[3790] | 220 | template<class T> |
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[5103] | 221 | inline T* tList<T>::lastElement() const |
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[3790] | 222 | { |
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| 223 | return this->last->curr; |
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| 224 | } |
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[2822] | 225 | |
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[3790] | 226 | |
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[4497] | 227 | /** |
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[4836] | 228 | * returns true if the list is empty |
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| 229 | * @returns true if the list is empty |
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[4497] | 230 | */ |
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[2822] | 231 | template<class T> |
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[5103] | 232 | inline bool tList<T>::isEmpty() const |
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[2822] | 233 | { |
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| 234 | return (this->size==0)?true:false; |
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| 235 | } |
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| 236 | |
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[4508] | 237 | /** |
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[4836] | 238 | * checks if an entity is in the List |
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| 239 | * @param entity The entity to check for in the entire List. |
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| 240 | * @returns true if it is, false otherwise |
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[4508] | 241 | */ |
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| 242 | template<class T> |
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| 243 | inline bool tList<T>::inList(T* entity) |
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[4574] | 244 | { |
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[4508] | 245 | // pre checks |
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| 246 | if(this->size == 0) return false; |
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| 247 | if( entity == NULL) return false; |
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[2822] | 248 | |
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[4508] | 249 | // search in the List |
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| 250 | this->currentEl = this->first; |
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| 251 | while(this->currentEl->curr != entity && this->currentEl != NULL) |
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| 252 | this->currentEl = this->currentEl->next; |
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| 253 | |
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| 254 | // post checks |
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[4574] | 255 | if(this->currentEl == NULL) |
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[4508] | 256 | return false; |
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| 257 | else |
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| 258 | return true; |
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| 259 | } |
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| 260 | |
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[4497] | 261 | /** |
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[4836] | 262 | * this returns the number of elements in the list |
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| 263 | * @returns number of elements |
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[4497] | 264 | */ |
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[2822] | 265 | template<class T> |
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[5103] | 266 | inline unsigned int tList<T>::getSize() const |
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[2822] | 267 | { |
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| 268 | return this->size; |
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| 269 | } |
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| 270 | |
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| 271 | |
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[4497] | 272 | /** |
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[4836] | 273 | * creates an itereator object and returns it |
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| 274 | * @returns the iterator object to this list |
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[4497] | 275 | |
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| 276 | You will use this, if you want to iterate through the list |
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[3832] | 277 | */ |
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[2822] | 278 | template<class T> |
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[5103] | 279 | inline tIterator<T>* tList<T>::getIterator() const |
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[3652] | 280 | { |
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[5110] | 281 | return new tIterator<T>(this); |
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[3652] | 282 | } |
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| 283 | |
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| 284 | |
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[2822] | 285 | |
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[3585] | 286 | /** |
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[4836] | 287 | * this returns the next element after toEntity or the first if toEntity is last |
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| 288 | * @param toEntity: the entity after which is an entity, that has to be returned, sorry, terrible phrase |
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| 289 | * @returns the element after toEntity |
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[3585] | 290 | */ |
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[2822] | 291 | template<class T> |
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[3831] | 292 | inline T* tList<T>::nextElement(T* toEntity) |
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[3585] | 293 | { |
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[3586] | 294 | //if( this->last == this->first == NULL) return NULL; |
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| 295 | if(this->size == 0) return NULL; |
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[3585] | 296 | if( toEntity == NULL) return this->first->curr; |
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| 297 | if( toEntity == this->last->curr ) return this->first->curr; |
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| 298 | this->currentEl = this->first; |
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| 299 | while(this->currentEl->curr != toEntity && this->currentEl->next != NULL) |
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| 300 | { |
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| 301 | this->currentEl = this->currentEl->next; |
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| 302 | } |
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| 303 | if(this->currentEl == NULL) return NULL; |
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| 304 | return this->currentEl->next->curr; |
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| 305 | } |
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| 306 | |
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| 307 | |
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[4497] | 308 | /** |
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[4836] | 309 | * creates an array out of the list (ATTENTION: not implemented) |
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| 310 | * @returns pointer to the array beginning |
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[4497] | 311 | |
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| 312 | ATTENTION: function is not implemented and wont do anything |
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| 313 | */ |
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[3585] | 314 | template<class T> |
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[2822] | 315 | T* tList<T>::toArray() |
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[4497] | 316 | { |
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| 317 | return NULL; |
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| 318 | } |
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[2822] | 319 | |
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[5110] | 320 | |
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| 321 | |
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| 322 | |
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| 323 | /** |
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| 324 | * an iterator class |
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| 325 | |
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| 326 | this enables the user to iterate through a list very easely |
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| 327 | */ |
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| 328 | template<class T> class tIterator |
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| 329 | { |
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| 330 | public: |
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| 331 | tIterator(const tList<T>* list); |
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| 332 | ~tIterator(); |
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| 333 | |
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| 334 | T* firstElement(); |
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| 335 | T* nextElement(); |
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| 336 | T* seekElement(T* element); |
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| 337 | |
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| 338 | private: |
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| 339 | listElement<T>* currentEl; //!< pointer to the current list element in the iterator |
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| 340 | listElement<T>* tmpEl; //!< temp listElemnt pointer |
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| 341 | const tList<T>* list; //!< The List, that we want to iterate through |
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| 342 | }; |
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| 343 | |
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| 344 | |
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| 345 | /** |
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| 346 | * iterator constructor |
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| 347 | * @param startElement: the first list element from the tList |
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| 348 | |
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| 349 | normaly you will use it like this: |
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| 350 | |
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| 351 | tIterator<char>* nameIterator = nameList->getIterator(); |
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| 352 | char name* = nameIterator->nextElement(); |
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| 353 | while( name != NULL) |
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| 354 | { |
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| 355 | PRINTF(3)("found name: %s in list\n", name); |
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| 356 | name = nameIterator->nextElement(); |
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| 357 | } |
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| 358 | delete nameIterator; |
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| 359 | */ |
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| 360 | template<class T> |
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| 361 | inline tIterator<T>::tIterator (const tList<T>* list) |
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| 362 | { |
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| 363 | this->currentEl = list->first; |
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| 364 | this->tmpEl = NULL; |
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| 365 | this->list = list; |
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| 366 | } |
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| 367 | |
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| 368 | |
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| 369 | /** |
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| 370 | * the destructor |
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| 371 | */ |
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| 372 | template<class T> |
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| 373 | inline tIterator<T>::~tIterator () |
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| 374 | { |
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| 375 | this->currentEl = NULL; |
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| 376 | } |
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| 377 | |
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| 378 | template<class T> |
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| 379 | inline T* tIterator<T>::firstElement () |
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| 380 | { |
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| 381 | this->currentEl = this->list->first; |
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| 382 | if (this->currentEl == NULL) |
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| 383 | return NULL; |
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| 384 | else |
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| 385 | return this->currentEl->curr; |
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| 386 | } |
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| 387 | |
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| 388 | |
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| 389 | /** |
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| 390 | * use it to iterate through the list |
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| 391 | * @returns next list element |
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| 392 | */ |
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| 393 | template<class T> |
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| 394 | inline T* tIterator<T>::nextElement () |
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| 395 | { |
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| 396 | if( this->currentEl == NULL || this->currentEl->next == NULL) |
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| 397 | { |
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| 398 | this->currentEl = NULL; |
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| 399 | return NULL; |
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| 400 | } |
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| 401 | |
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| 402 | this->currentEl = this->currentEl->next; |
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| 403 | return this->currentEl->curr; |
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| 404 | } |
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| 405 | |
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| 406 | /** |
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| 407 | * gets the element after the selected one, sets the iterator to this point in the list |
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| 408 | * @param element the element to seek |
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| 409 | * @returns next list element |
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| 410 | |
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| 411 | Attention: if you seek an element, the iterator pointer will point to the NEXT listelement after the argument! |
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| 412 | */ |
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| 413 | template<class T> |
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| 414 | inline T* tIterator<T>::seekElement (T* element) |
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| 415 | { |
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| 416 | for(this->tmpEl = this->list->first; this->tmpEl != NULL; this->tmpEl = this->tmpEl->next) |
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| 417 | { |
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| 418 | if( unlikely(this->tmpEl->curr == element)) |
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| 419 | { |
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| 420 | if( this->tmpEl->next != NULL) |
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| 421 | { |
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| 422 | this->currentEl = this->tmpEl; |
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| 423 | return this->tmpEl->next->curr; |
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| 424 | } |
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| 425 | return NULL; |
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| 426 | } |
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| 427 | } |
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| 428 | return NULL; |
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| 429 | } |
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| 430 | |
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[3224] | 431 | #endif /* _LIST_H */ |
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