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package net.sf.tacos.components.tree; |
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import java.io.Serializable; |
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import java.util.Collection; |
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import java.util.Iterator; |
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import java.util.Set; |
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import net.sf.tacos.model.IKeyProvider; |
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import net.sf.tacos.model.ITreeContentProvider; |
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import org.apache.hivemind.util.Defense; |
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public class TreeManager implements ITreeManager { |
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private final Set state; |
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private final ITreeContentProvider contentProvider; |
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private final IKeyProvider keyProvider; |
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public TreeManager(Set state, ITreeContentProvider contentProvider, |
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IKeyProvider keyProvider) |
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{ |
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Defense.notNull(state, "tree state"); |
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Defense.notNull(contentProvider, "tree contentProvider"); |
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Defense.notNull(keyProvider, "tree keyProvider"); |
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this.state = state; |
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this.contentProvider = contentProvider; |
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this.keyProvider = keyProvider; |
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} |
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public boolean isExpanded(Object element) |
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{ |
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return isExpandedKey(keyProvider.getKey(element)); |
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} |
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public boolean isExpandedKey(Serializable key) |
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{ |
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return state.contains(key); |
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} |
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public void setExpanded(Object element, boolean open) |
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{ |
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setExpandedKey(keyProvider.getKey(element), open); |
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} |
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public void setExpandedKey(Serializable key, boolean open) |
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{ |
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if (open) { |
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state.add(key); |
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} else { |
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state.remove(key); |
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} |
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} |
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public Set getState() |
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{ |
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return state; |
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} |
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public void collapseAll() |
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{ |
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state.clear(); |
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} |
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public Object reveal(Object element) |
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{ |
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Object parent = contentProvider.getParent(element); |
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if (parent != null) { |
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setExpanded(parent, true); |
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return reveal(parent); |
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} else return element; |
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} |
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public void expandAll() |
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{ |
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expand(contentProvider.getElements()); |
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} |
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private void expand(Collection rootElements) |
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{ |
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for(Iterator i = rootElements.iterator(); i.hasNext();) { |
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Object element = i.next(); |
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setExpanded(element, true); |
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if (contentProvider.hasChildren(element)) { |
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expand(contentProvider.getChildren(element)); |
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} |
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} |
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} |
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} |