root / org.gvsig.proj / branches / refactor2018 / org.gvsig.proj / org.gvsig.proj.swing / org.gvsig.proj.swing.impl / src / main / java / org / gvsig / proj / swing / impl / tree / GroupLoader.java @ 866
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1 | 852 | cmartinez | package org.gvsig.proj.swing.impl.tree; |
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3 | import java.util.ArrayList; |
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5 | import javax.swing.tree.TreeNode; |
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7 | 866 | cmartinez | /**
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8 | * Loads the children of a loaded group
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9 | *
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10 | * @author Cesar Martinez Izquierdo
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11 | */
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12 | public interface GroupLoader { |
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14 | /**
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15 | * Start loading the children, which can happen immediately or
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16 | * be done asynchronously
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17 | */
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18 | void execute();
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20 | /**
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21 | * Attempts to cancel the loading process
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22 | * @return
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23 | */
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24 | void cancel();
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26 | /**
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27 | * Whether the loading process has been cancelled
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28 | *
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29 | * @return
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30 | */
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31 | boolean isCancelled();
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32 | |||
33 | /**
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34 | * Creates an instance of a node to be displayed as temporary child
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35 | * while data is loading
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36 | *
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37 | * @return A TreeNode instance or null if no loading node is needed
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38 | */
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39 | TreeNode createLoadingNode();
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41 | } |