svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.mapcontext / org.gvsig.fmap.mapcontext.api / src / main / java / org / gvsig / fmap / mapcontext / layers / LayersIterator.java @ 40559
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1 | 40559 | jjdelcerro | /**
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2 | * gvSIG. Desktop Geographic Information System.
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3 | *
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4 | * Copyright (C) 2007-2013 gvSIG Association.
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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 3
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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 | * For any additional information, do not hesitate to contact us
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22 | * at info AT gvsig.com, or visit our website www.gvsig.com.
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23 | */
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24 | 40435 | jjdelcerro | package org.gvsig.fmap.mapcontext.layers; |
25 | |||
26 | import java.util.ArrayList; |
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27 | import java.util.Iterator; |
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28 | import java.util.NoSuchElementException; |
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29 | |||
30 | import org.gvsig.fmap.mapcontext.layers.operations.LayerCollection; |
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31 | |||
32 | |||
33 | /**
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34 | * Interator for iterate in a Layers tree
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35 | * <P>
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36 | * Extend this class to create an expecific layer iterator
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37 | * and override the method <code>evaluate</code> for check
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38 | * if a layer will be in the iteration list.
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39 | * <P>
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40 | * @author jmvivo
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41 | *
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42 | */
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43 | public class LayersIterator implements Iterator { |
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44 | ArrayList layersList =new ArrayList(); |
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45 | int index = 0; |
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46 | |||
47 | public LayersIterator() {
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48 | |||
49 | } |
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50 | |||
51 | public LayersIterator(FLayer layer) {
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52 | this.appendLayer(layer);
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53 | } |
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54 | |||
55 | protected void appendLayer(FLayer layer) { |
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56 | if (this.evaluate(layer)) { |
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57 | layersList.add(layer); |
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58 | } |
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59 | if (layer instanceof LayerCollection) { |
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60 | appendLayers((LayerCollection)layer); |
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61 | } |
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62 | } |
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63 | |||
64 | private void appendLayers(LayerCollection layers) { |
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65 | int i;
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66 | for (i=0;i< layers.getLayersCount();i++) { |
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67 | appendLayer(layers.getLayer(i)); |
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68 | } |
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69 | } |
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70 | |||
71 | public void remove() { |
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72 | throw new UnsupportedOperationException(); |
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73 | } |
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74 | |||
75 | public boolean hasNext() { |
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76 | return index < layersList.size();
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77 | } |
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78 | |||
79 | public Object next() { |
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80 | return nextLayer();
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81 | } |
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82 | |||
83 | /**
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84 | * Returns the next layer in the iteration.
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85 | *
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86 | * @return the next layer in the iteration.
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87 | * @exception NoSuchElementException iteration has no more elements.
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88 | *
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89 | * @see next()
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90 | */
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91 | public FLayer nextLayer() {
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92 | if (!this.hasNext()) { |
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93 | throw new NoSuchElementException(); |
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94 | } |
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95 | FLayer aux = (FLayer)layersList.get(index); |
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96 | index++; |
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97 | return aux;
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98 | } |
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99 | |||
100 | /**
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101 | * Called before add a layer to the iteration
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102 | * list.
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103 | * @param layer the layer to check
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104 | * @return true if the layer will be in the iteration list
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105 | */
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106 | public boolean evaluate(FLayer layer) { |
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107 | return true; |
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108 | } |
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109 | |||
110 | } |