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annotate mercurial/thirdparty/zope/interface/common/mapping.py @ 46357:72f5280e33b6

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commit: look-up new revision once Look-up by node is slightly more expensive, so since it is necessary more than once, do it explicitly. Differential Revision: https://phab.mercurial-scm.org/D9830
author Joerg Sonnenberger <joerg@bec.de>
date Tue, 19 Jan 2021 00:18:39 +0100
parents 68ee61822182
children
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1 ##############################################################################
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2 #
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3 # Copyright (c) 2001, 2002 Zope Foundation and Contributors.
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4 # All Rights Reserved.
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5 #
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6 # This software is subject to the provisions of the Zope Public License,
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7 # Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
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8 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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9 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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10 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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11 # FOR A PARTICULAR PURPOSE.
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12 #
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13 ##############################################################################
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14 """Mapping Interfaces
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15 """
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16
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17 from __future__ import absolute_import
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18
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19 from .. import Interface
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20
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21 class IItemMapping(Interface):
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22 """Simplest readable mapping object
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23 """
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24
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25 def __getitem__(key):
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26 """Get a value for a key
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27
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28 A KeyError is raised if there is no value for the key.
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29 """
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30
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31
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32 class IReadMapping(IItemMapping):
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33 """Basic mapping interface
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34 """
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35
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36 def get(key, default=None):
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37 """Get a value for a key
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38
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39 The default is returned if there is no value for the key.
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40 """
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41
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42 def __contains__(key):
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43 """Tell if a key exists in the mapping."""
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44
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45
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46 class IWriteMapping(Interface):
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47 """Mapping methods for changing data"""
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48
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49 def __delitem__(key):
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50 """Delete a value from the mapping using the key."""
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51
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52 def __setitem__(key, value):
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53 """Set a new item in the mapping."""
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54
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55
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56 class IEnumerableMapping(IReadMapping):
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57 """Mapping objects whose items can be enumerated.
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58 """
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59
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60 def keys():
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61 """Return the keys of the mapping object.
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62 """
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63
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64 def __iter__():
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65 """Return an iterator for the keys of the mapping object.
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66 """
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67
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68 def values():
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69 """Return the values of the mapping object.
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70 """
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71
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72 def items():
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73 """Return the items of the mapping object.
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74 """
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75
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76 def __len__():
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77 """Return the number of items.
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78 """
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79
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80 class IMapping(IWriteMapping, IEnumerableMapping):
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81 ''' Simple mapping interface '''
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82
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83 class IIterableMapping(IEnumerableMapping):
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84
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85 def iterkeys():
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86 "iterate over keys; equivalent to __iter__"
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87
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88 def itervalues():
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89 "iterate over values"
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90
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91 def iteritems():
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92 "iterate over items"
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93
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94 class IClonableMapping(Interface):
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95
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96 def copy():
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97 "return copy of dict"
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98
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99 class IExtendedReadMapping(IIterableMapping):
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100
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101 def has_key(key):
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102 """Tell if a key exists in the mapping; equivalent to __contains__"""
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103
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104 class IExtendedWriteMapping(IWriteMapping):
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105
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106 def clear():
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107 "delete all items"
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108
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109 def update(d):
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110 " Update D from E: for k in E.keys(): D[k] = E[k]"
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111
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112 def setdefault(key, default=None):
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113 "D.setdefault(k[,d]) -> D.get(k,d), also set D[k]=d if k not in D"
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114
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115 def pop(k, *args):
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116 """remove specified key and return the corresponding value
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117 *args may contain a single default value, or may not be supplied.
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118 If key is not found, default is returned if given, otherwise
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119 KeyError is raised"""
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120
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121 def popitem():
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122 """remove and return some (key, value) pair as a
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123 2-tuple; but raise KeyError if mapping is empty"""
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124
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125 class IFullMapping(
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126 IExtendedReadMapping, IExtendedWriteMapping, IClonableMapping, IMapping):
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127 ''' Full mapping interface ''' # IMapping included so tests for IMapping
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128 # succeed with IFullMapping