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org.apache.jetspeed.om.folder.impl.FolderMenuDefinitionElementList |
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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 | package org.apache.jetspeed.om.folder.impl; |
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18 | ||
19 | import java.util.AbstractList; |
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20 | ||
21 | /** |
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22 | * FolderMenuDefinitionElementList |
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23 | * |
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24 | * @author <a href="mailto:rwatler@apache.org">Randy Watler</a> |
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25 | * @version $Id$ |
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26 | */ |
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27 | class FolderMenuDefinitionElementList extends AbstractList |
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28 | { |
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29 | private FolderMenuDefinitionImpl menuDefinition; |
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30 | ||
31 | FolderMenuDefinitionElementList(FolderMenuDefinitionImpl menuDefinition) |
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32 | { |
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33 | 0 | super(); |
34 | 0 | this.menuDefinition = menuDefinition; |
35 | 0 | } |
36 | ||
37 | /** |
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38 | * validateMenuElementForAdd |
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39 | * |
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40 | * Validates element to be added to this list. |
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41 | * |
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42 | * @param menuElement element to add |
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43 | * @return list element to add |
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44 | */ |
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45 | private FolderMenuDefinitionElement validateMenuElementForAdd(FolderMenuDefinitionElement menuElement) |
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46 | { |
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47 | // validate element instance class |
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48 | 0 | if (menuElement == null) |
49 | { |
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50 | 0 | throw new NullPointerException("Unable to add null to list."); |
51 | } |
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52 | 0 | return menuElement; |
53 | } |
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54 | ||
55 | /* (non-Javadoc) |
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56 | * @see java.util.List#add(int,java.lang.Object) |
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57 | */ |
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58 | public void add(int index, Object element) |
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59 | { |
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60 | // implement for modifiable AbstractList: |
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61 | // validate index |
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62 | 0 | if ((index < 0) || (index > menuDefinition.accessElements().size())) |
63 | { |
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64 | 0 | throw new IndexOutOfBoundsException("Unable to add to list at index: " + index); |
65 | } |
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66 | // verify element |
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67 | 0 | FolderMenuDefinitionElement menuElement = validateMenuElementForAdd((FolderMenuDefinitionElement)element); |
68 | // add to underlying ordered list |
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69 | 0 | menuDefinition.accessElements().add(index, menuElement); |
70 | // set element order in added element |
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71 | 0 | if (index > 0) |
72 | { |
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73 | 0 | menuElement.setElementOrder(((FolderMenuDefinitionElement)menuDefinition.accessElements().get(index-1)).getElementOrder() + 1); |
74 | } |
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75 | else |
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76 | { |
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77 | 0 | menuElement.setElementOrder(0); |
78 | } |
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79 | // maintain element order in subsequent elements |
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80 | 0 | for (int i = index, limit = menuDefinition.accessElements().size() - 1; (i < limit); i++) |
81 | { |
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82 | 0 | FolderMenuDefinitionElement nextMenuElement = (FolderMenuDefinitionElement)menuDefinition.accessElements().get(i + 1); |
83 | 0 | if (nextMenuElement.getElementOrder() <= menuElement.getElementOrder()) |
84 | { |
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85 | // adjust element order for next element |
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86 | 0 | nextMenuElement.setElementOrder(menuElement.getElementOrder() + 1); |
87 | 0 | menuElement = nextMenuElement; |
88 | } |
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89 | else |
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90 | { |
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91 | // element order maintained for remaining list elements |
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92 | break; |
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93 | } |
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94 | } |
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95 | 0 | } |
96 | ||
97 | /* (non-Javadoc) |
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98 | * @see java.util.List#get(int) |
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99 | */ |
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100 | public Object get(int index) |
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101 | { |
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102 | // implement for modifiable AbstractList |
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103 | 0 | return menuDefinition.accessElements().get(index); |
104 | } |
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105 | ||
106 | /* (non-Javadoc) |
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107 | * @see java.util.List#remove(int) |
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108 | */ |
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109 | public Object remove(int index) |
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110 | { |
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111 | // implement for modifiable AbstractList |
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112 | 0 | return menuDefinition.accessElements().remove(index); |
113 | } |
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114 | ||
115 | /* (non-Javadoc) |
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116 | * @see java.util.List#set(int,java.lang.Object) |
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117 | */ |
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118 | public Object set(int index, Object element) |
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119 | { |
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120 | // implement for modifiable AbstractList: |
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121 | // verify element |
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122 | 0 | FolderMenuDefinitionElement newMenuElement = validateMenuElementForAdd((FolderMenuDefinitionElement)element); |
123 | // set in underlying ordered list |
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124 | 0 | FolderMenuDefinitionElement menuElement = (FolderMenuDefinitionElement)menuDefinition.accessElements().set(index, newMenuElement); |
125 | // set element order in new element |
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126 | 0 | newMenuElement.setElementOrder(menuElement.getElementOrder()); |
127 | // return element |
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128 | 0 | return menuElement; |
129 | } |
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130 | ||
131 | /* (non-Javadoc) |
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132 | * @see java.util.List#size() |
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133 | */ |
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134 | public int size() |
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135 | { |
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136 | // implement for modifiable AbstractList |
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137 | 0 | return menuDefinition.accessElements().size(); |
138 | } |
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139 | } |
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