1 | /* |
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2 | * Licensed to the Apache Software Foundation (ASF) under one or more |
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3 | * contributor license agreements. See the NOTICE file distributed with |
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4 | * this work for additional information regarding copyright ownership. |
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5 | * The ASF licenses this file to You under the Apache License, Version 2.0 |
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6 | * (the "License"); you may not use this file except in compliance with |
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7 | * the License. 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 | |
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18 | /* |
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19 | * $Id: Hashers.hpp 679382 2008-07-24 12:09:39Z amassari $ |
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20 | */ |
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21 | |
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22 | #if !defined(XERCESC_INCLUDE_GUARD_HASHERS_HPP) |
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23 | #define XERCESC_INCLUDE_GUARD_HASHERS_HPP |
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24 | |
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25 | #include <icxercesc/util/XMLString.hpp> |
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26 | // #include <icxmlc/murmurhash3.h> |
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27 | |
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28 | XERCES_CPP_NAMESPACE_BEGIN |
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29 | |
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30 | // |
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31 | // Common hashers. Only widely-used hashers should be placed here. |
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32 | // |
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33 | |
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34 | /** |
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35 | * Hasher for keys that are const XMLCh*. |
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36 | */ |
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37 | struct StringHasher |
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38 | { |
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39 | /** |
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40 | * Returns a hash value based on the key |
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41 | * |
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42 | * @param key the key to be hashed |
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43 | * @param mod the modulus the hasher should use |
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44 | */ |
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45 | inline XMLSize_t getHashVal(const void* key, XMLSize_t mod) const |
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46 | { |
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47 | return XMLString::hash ((const XMLCh*)key, mod); |
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48 | // return getHashVal(key, XMLString::stringLen((const XMLCh*)key), mod); |
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49 | } |
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50 | |
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51 | /** |
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52 | * Returns a hash value based on the key |
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53 | * |
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54 | * @param key the key to be hashed |
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55 | * @param mod the modulus the hasher should use |
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56 | */ |
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57 | inline XMLSize_t getHashVal(const void* rawKey, const unsigned int length, XMLSize_t mod) const |
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58 | { |
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59 | return XMLString::hashN((const XMLCh*)rawKey, length, mod); |
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60 | // return (XMLSize_t)(Murmur3<XMLCh>::hash((const XMLCh*)rawKey, length, (XMLSize_t)(0x374a3ea6e0ad6ecb))) % mod; |
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61 | } |
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62 | |
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63 | /** |
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64 | * Compares two keys and determines if they are semantically equal |
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65 | * |
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66 | * @param key1 the first key to be compared |
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67 | * @param key2 the second key to be compared |
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68 | * |
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69 | * @return true if they are equal |
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70 | */ |
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71 | inline bool equals(const void *const key1, const void *const key2) const |
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72 | { |
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73 | return XMLString::equals ((const XMLCh*)key1, (const XMLCh*)key2); |
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74 | } |
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75 | }; |
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76 | |
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77 | /** |
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78 | * Hasher for keys that are pointers. |
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79 | */ |
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80 | struct PtrHasher |
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81 | { |
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82 | /** |
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83 | * Returns a hash value based on the key |
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84 | * |
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85 | * @param key the key to be hashed |
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86 | * @param mod the modulus the hasher should use |
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87 | */ |
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88 | inline XMLSize_t getHashVal(const void* key, XMLSize_t mod) const |
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89 | { |
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90 | return ((XMLSize_t)key) % mod; |
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91 | } |
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92 | |
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93 | /** |
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94 | * Returns a hash value based on the key |
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95 | * |
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96 | * @param key the key to be hashed |
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97 | * @param mod the modulus the hasher should use |
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98 | */ |
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99 | inline XMLSize_t getHashVal(const void* rawKey, const unsigned int, XMLSize_t mod) const |
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100 | { |
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101 | return getHashVal(rawKey, mod); |
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102 | } |
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103 | |
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104 | |
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105 | /** |
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106 | * Compares two keys and determines if they are semantically equal |
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107 | * |
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108 | * @param key1 the first key to be compared |
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109 | * @param key2 the second key to be compared |
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110 | * |
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111 | * @return true if they are equal |
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112 | */ |
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113 | inline bool equals(const void *const key1, const void *const key2) const |
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114 | { |
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115 | return key1 == key2; |
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116 | } |
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117 | }; |
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118 | |
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119 | XERCES_CPP_NAMESPACE_END |
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120 | |
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121 | #endif |
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