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annotate components/container.py @ 189:4381be70e1bb tip

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Fixed incompatibility with latest changes to bgrease.
author Beliar <KarstenBock@gmx.net>
date Sun, 08 Apr 2012 20:30:43 +0200
parents f94d4577ca5e
children
rev   line source
12
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1 # This program is free software: you can redistribute it and/or modify
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2 # it under the terms of the GNU General Public License as published by
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3 # the Free Software Foundation, either version 3 of the License, or
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4 # (at your option) any later version.
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5 #
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6 # This program is distributed in the hope that it will be useful,
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7 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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8 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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9 # GNU General Public License for more details.
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10 #
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11 # You should have received a copy of the GNU General Public License
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12 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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13
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14 from copy import deepcopy
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15
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16 from base import Base
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17
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18 class Container(Base):
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19 """
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20 Component that allows an entity to contain one or more child entities.
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21 """
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22
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23 def __init__(self):
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24 Base.__init__(self, children=list, max_bulk=int)
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25
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26 @property
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27 def saveable_fields(self):
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28 fields = self.fields.keys()
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29 fields.remove("children")
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30 return fields
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31
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32
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33
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34 class BulkLimitError(Exception):
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35 """Error that gets raised when the item would exceed the
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36 bulk limit of the container."""
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37
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38 def __init__(self, bulk, max_bulk):
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39 self.bulk = bulk
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40 self.max_bulk = max_bulk
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41
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42 def __str__(self):
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43 return "Item would exceed the bulk limit of the container."
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44
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45 class NoFreeSlotError(Exception):
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46 """Error that gets raised when the container has no free slots."""
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47
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48 def __str__(self):
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49 return "Container can't hold any more items."
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50
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51 def get_free_slot(container):
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52 """Returns the first slot of the container that is not occupied."""
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53 index = 0
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54 for child in container.children:
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55 if not child:
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56 return index
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57 index += 1
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58 raise NoFreeSlotError
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59
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60 def get_total_bulk(container):
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61 """Returns the bulk of all items in the container."""
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62 total_bulk = 0
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63 for child in container.children:
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64 if child:
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65 total_bulk += child.bulk
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66 return total_bulk
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67
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68 def get_total_weight(container):
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69 """Returns the weight of all items in the container."""
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70 total_weight = 0
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71 for child in container.children:
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72 if child:
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73 total_weight += child.weight
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74 return total_weight
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75
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76 def get_item(container, slot_or_type):
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77 """Returns the item that is in the slot, or has the given type."""
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78 if type(slot_or_type) == int:
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79 if len(container.children) >= (slot_or_type + 1):
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80 return container.children[slot_or_type]
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81 else:
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82 for child in container.children:
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83 if child and child.item_type == slot_or_type:
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84 return child
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85
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86 return None
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87
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88 def remove_item(container, slot_or_type):
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89 """Removes the item at the given slot, or with the given type."""
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90 if type(slot_or_type) == int:
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91 item = get_item(container, slot_or_type)
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92 if item:
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93 container.children[slot_or_type] = None
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94 item.container = None
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95 item.slot = -1
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96 else:
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97 for child in container.children:
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98 if child and child.item_type == slot_or_type:
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99 container.children[child.slot] = None
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100 child.container = None
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101 child.slot = -1
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102
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103 def take_item(container, slot_or_type):
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104 """Moves the item at the given slot, or with the given type,
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105 out of the container and returns it."""
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106 item = get_item(container, slot_or_type)
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107 if item:
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108 remove_item(container, slot_or_type)
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109 return item
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110
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111 def put_item(container, item, slot=-1):
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112 """Puts the item at the given slot in the container.
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113 Returns the item previously at the slot."""
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114 if slot == -1:
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115 slot = get_free_slot(container)
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116 total_bulk = get_total_bulk(container)
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117 total_bulk += item.bulk
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118 old_item = get_item(container, slot)
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119 if old_item:
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120 total_bulk -= old_item.bulk
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121 if total_bulk > container.max_bulk:
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122 raise BulkLimitError(total_bulk, container.max_bulk)
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123 remove_item(container, slot)
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124 container.children[slot] = item
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125 if item.container:
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126 remove_item(item.container, item.slot)
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127 item.container = container
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128 item.slot = slot
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129 return old_item