svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.dal / org.gvsig.fmap.dal.impl / src / main / java / org / gvsig / fmap / dal / feature / paging / impl / OneSubsetOneSetPagingCalculator.java @ 40435
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1 | 40435 | jjdelcerro | /* gvSIG. Geographic Information System of the Valencian Government
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2 | *
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3 | * Copyright (C) 2007-2008 Infrastructures and Transports Department
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4 | * of the Valencian Government (CIT)
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5 | *
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6 | * This program is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU General Public License
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8 | * as published by the Free Software Foundation; either version 2
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9 | * of the License, or (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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19 | * MA 02110-1301, USA.
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20 | *
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21 | */
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22 | package org.gvsig.fmap.dal.feature.paging.impl; |
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23 | |||
24 | import org.gvsig.tools.paging.DefaultPagingCalculator; |
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25 | |||
26 | /**
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27 | * Performs the calculations needed to be able to do pagination with two Sets of
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28 | * data which must be viewed as a single set of data. The first set is supposed
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29 | * to be a subset of the second one, so the size of the first set must be
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30 | * subtracted from the second one.
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31 | *
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32 | * @author gvSIG team
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33 | */
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34 | public class OneSubsetOneSetPagingCalculator extends DefaultPagingCalculator { |
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35 | |||
36 | private final Sizeable firstSet; |
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37 | private final Sizeable secondSet; |
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38 | |||
39 | /**
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40 | * @see AbstractPagingCalculator#AbstractPagingCalculator(int).
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41 | * @param firstSet
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42 | * the first set of elements to calculate pagination for
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43 | * @param secondSet
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44 | * the second set of elements to calculate pagination for
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45 | */
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46 | public OneSubsetOneSetPagingCalculator(Sizeable firstSet,
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47 | Sizeable secondSet, int maxPageSize) {
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48 | super(firstSet, maxPageSize);
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49 | this.firstSet = firstSet;
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50 | this.secondSet = secondSet;
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51 | } |
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52 | |||
53 | /**
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54 | * @see AbstractPagingCalculator#AbstractPagingCalculator(int, long).
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55 | * @param firstSet
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56 | * the first set of elements to calculate pagination for
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57 | * @param secondSet
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58 | * the second set of elements to calculate pagination for
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59 | */
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60 | public OneSubsetOneSetPagingCalculator(Sizeable firstSet,
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61 | Sizeable secondSet, int maxPageSize, long currentPage) { |
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62 | super(firstSet, maxPageSize, currentPage);
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63 | this.firstSet = firstSet;
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64 | this.secondSet = secondSet;
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65 | } |
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66 | |||
67 | public long getTotalSize() { |
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68 | return secondSet.getSize();
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69 | } |
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70 | |||
71 | /**
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72 | * Returns the size of the first set.
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73 | *
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74 | * @return the first set size
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75 | */
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76 | public long getFirstSetSize() { |
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77 | return firstSet.getSize();
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78 | } |
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79 | |||
80 | /**
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81 | * Returns the size of the second set.
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82 | *
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83 | * @return the second set size
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84 | */
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85 | public long getSecondSetSize() { |
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86 | return secondSet.getSize() - getFirstSetSize();
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87 | } |
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88 | |||
89 | /**
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90 | * Returns the index of the first element in the page which is available
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91 | * into the first set, if the current page has elements on it.
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92 | *
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93 | * @return the index of the first element into the first set
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94 | */
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95 | public long getFirstSetInitialIndex() { |
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96 | if (hasCurrentPageAnyValuesInFirstSet()) {
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97 | return calculateFirstSetInitialIndex();
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98 | } else {
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99 | return -1; |
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100 | } |
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101 | } |
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102 | |||
103 | private long calculateFirstSetInitialIndex() { |
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104 | return getCurrentPage() * getMaxPageSize();
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105 | } |
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106 | |||
107 | /**
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108 | * Returns the index of the first element in the page which is available
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109 | * into the second set, if the current page has elements on it.
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110 | *
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111 | * @return the index of the first element into the second set
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112 | */
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113 | public long getSecondSetInitialIndex() { |
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114 | if (hasCurrentPageAnyValuesInSecondSet()) {
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115 | if (hasCurrentPageAnyValuesInFirstSet()) {
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116 | return 0; |
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117 | } else {
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118 | return getInitialIndex() - getFirstSetSize();
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119 | } |
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120 | } else {
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121 | return -1; |
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122 | } |
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123 | } |
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124 | |||
125 | /**
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126 | * Returns the number of elements of the current page into the first set.
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127 | *
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128 | * @return the number of elements of the current page into the first set
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129 | */
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130 | public long getFirstSetHowMany() { |
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131 | if (hasCurrentPageAnyValuesInFirstSet()) {
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132 | return (hasCurrentPageAllValuesInFirstSet()) ? getCurrentPageSize()
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133 | : (getFirstSetSize() - calculateFirstSetInitialIndex()); |
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134 | } else {
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135 | return 0; |
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136 | } |
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137 | } |
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138 | |||
139 | /**
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140 | * Returns the number of elements of the current page into the second set.
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141 | *
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142 | * @return the number of elements of the current page into the second set
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143 | */
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144 | public long getSecondSetHowMany() { |
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145 | if (hasCurrentPageAnyValuesInSecondSet()) {
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146 | return getLastIndex() - getFirstSetSize()
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147 | - getSecondSetInitialIndex() + 1;
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148 | } else {
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149 | return 0; |
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150 | } |
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151 | } |
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152 | |||
153 | /**
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154 | * Returns if the current page has all its values into the first set.
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155 | *
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156 | * @return if the current page has all its values into the first set
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157 | */
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158 | protected boolean hasCurrentPageAllValuesInFirstSet() { |
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159 | return calculateFirstSetInitialIndex() + getCurrentPageSize() <= getFirstSetSize();
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160 | } |
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161 | |||
162 | /**
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163 | * Returns if the current page has any of its values into the first set.
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164 | *
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165 | * @return if the current page has any of its values into the first set
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166 | */
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167 | public boolean hasCurrentPageAnyValuesInFirstSet() { |
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168 | return calculateFirstSetInitialIndex() < getFirstSetSize();
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169 | } |
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170 | |||
171 | /**
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172 | * Returns if the current page has any of its values into the second set.
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173 | *
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174 | * @return if the current page has any of its values into the second set
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175 | */
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176 | public boolean hasCurrentPageAnyValuesInSecondSet() { |
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177 | return getLastIndex() >= getFirstSetSize();
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178 | } |
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179 | } |