1 | |
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2 | /* |
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3 | Copyright 2013 Willem Vermin, SURFsara |
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4 | |
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5 | Licensed under the Apache License, Version 2.0 (the "License"); |
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6 | you may not use this file except in compliance with the License. |
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7 | You may obtain a copy of the License at |
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8 | |
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9 | http://www.apache.org/licenses/LICENSE-2.0 |
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10 | |
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11 | Unless required by applicable law or agreed to in writing, software |
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12 | distributed under the License is distributed on an "AS IS" BASIS, |
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13 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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14 | See the License for the specific language governing permissions and |
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15 | limitations under the License. |
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16 | */ |
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17 | #ifndef STOPOS_KEY_H |
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18 | #define STOPOS_KEY_H |
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19 | #include <string> |
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20 | #include <iostream> |
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21 | #include "stopos.h" |
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22 | |
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23 | class stopos_key |
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24 | { |
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25 | protected: |
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26 | std::string value; |
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27 | std::string slot; |
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28 | static const char firstchar = 'a'; |
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29 | static const char lastchar = 'z'; |
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30 | static const unsigned int base = lastchar - firstchar + 1; |
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31 | template <typename T> void tostring1(std::string &v,const T n) |
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32 | { |
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33 | if (n == 0) |
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34 | return; |
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35 | unsigned int c = n + firstchar - base*(n/base); |
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36 | tostring1(v,n/base); |
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37 | v.push_back(c); |
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38 | } |
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39 | template <typename T> void tostring(std::string &v,const T n) |
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40 | { |
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41 | if (n == 0) |
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42 | v = firstchar; |
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43 | else |
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44 | tostring1(v,n); |
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45 | } |
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46 | public: |
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47 | stopos_key(); |
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48 | stopos_key(const std::string &s); |
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49 | void increment(void); |
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50 | std::string str(void) const; |
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51 | std::string get_key(void) const; |
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52 | std::string get_slot(void) const; |
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53 | void set_key(const std::string &k){ this->value = k;} |
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54 | void set_slot(const std::string &s){ this->slot = s;} |
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55 | void impossible(); |
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56 | bool operator==(const stopos_key &k) const; |
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57 | bool operator!=(const stopos_key &k) const; |
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58 | |
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59 | // to assign an unsigned integer value to a key |
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60 | template <typename T> void set(const T k,const std::string &slot) |
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61 | { |
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62 | this->value = ""; |
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63 | this->tostring(this->value,k); |
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64 | this->slot = slot; |
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65 | return; |
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66 | } |
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67 | |
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68 | // to get the unsigned integer value from a key |
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69 | template <typename T> T get() const |
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70 | { |
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71 | T r = 0; |
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72 | |
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73 | for (unsigned int i=0; i<this->value.size(); i++) |
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74 | r = this->base*r + this->value[i]-this->firstchar; |
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75 | |
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76 | return r; |
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77 | } |
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78 | |
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79 | static longuint KeyToNumber(const std::string s) |
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80 | { |
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81 | longuint r = 0; |
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82 | stopos_key d; |
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83 | for (unsigned int i=0; i<s.size(); i++) |
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84 | r = base*r + s[i]-firstchar; |
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85 | |
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86 | return r; |
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87 | } |
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88 | |
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89 | template <typename T> static std::string NumberToKey(const T n) |
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90 | { |
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91 | std::string s; |
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92 | stopos_key k; |
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93 | k.tostring(s,n); |
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94 | return s; |
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95 | } |
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96 | }; |
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97 | #endif |
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