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package org.apache.tapestry.contrib.table.model.common; |
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import java.lang.ref.WeakReference; |
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import java.util.ArrayList; |
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import java.util.Iterator; |
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import java.util.List; |
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import org.apache.tapestry.contrib.table.model.CTableDataModelEvent; |
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import org.apache.tapestry.contrib.table.model.ITableDataModel; |
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import org.apache.tapestry.contrib.table.model.ITableDataModelListener; |
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public abstract class AbstractTableDataModel implements ITableDataModel |
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{ |
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private List m_arrListeners; |
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public AbstractTableDataModel() |
37 | 0 | { |
38 | 0 | m_arrListeners = new ArrayList(); |
39 | 0 | } |
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protected void fireTableDataModelEvent(CTableDataModelEvent objEvent) |
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{ |
49 | 0 | synchronized(m_arrListeners) |
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{ |
51 | 0 | List arrEmptyReferences = null; |
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53 | 0 | for(Iterator it = m_arrListeners.iterator(); it.hasNext();) |
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{ |
55 | 0 | WeakReference objRef = (WeakReference) it.next(); |
56 | 0 | ITableDataModelListener objListener = (ITableDataModelListener) objRef |
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.get(); |
58 | 0 | if (objListener != null) |
59 | 0 | objListener.tableDataChanged(objEvent); |
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else |
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{ |
62 | 0 | if (arrEmptyReferences == null) |
63 | 0 | arrEmptyReferences = new ArrayList(); |
64 | 0 | arrEmptyReferences.add(objRef); |
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} |
66 | 0 | } |
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68 | 0 | if (arrEmptyReferences != null) |
69 | 0 | m_arrListeners.removeAll(arrEmptyReferences); |
70 | 0 | } |
71 | 0 | } |
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public void addTableDataModelListener(ITableDataModelListener objListener) |
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{ |
78 | 0 | synchronized(m_arrListeners) |
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{ |
80 | 0 | m_arrListeners.add(new WeakReference(objListener)); |
81 | 0 | } |
82 | 0 | } |
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public void removeTableDataModelListener(ITableDataModelListener objListener) |
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{ |
89 | 0 | synchronized(m_arrListeners) |
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{ |
91 | 0 | List arrEmptyReferences = null; |
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93 | 0 | for(Iterator it = m_arrListeners.iterator(); it.hasNext();) |
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{ |
95 | 0 | WeakReference objRef = (WeakReference) it.next(); |
96 | 0 | ITableDataModelListener objStoredListener = (ITableDataModelListener) objRef |
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.get(); |
98 | 0 | if (objListener == objStoredListener |
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|| objStoredListener == null) |
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{ |
101 | 0 | if (arrEmptyReferences == null) |
102 | 0 | arrEmptyReferences = new ArrayList(); |
103 | 0 | arrEmptyReferences.add(objRef); |
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} |
105 | 0 | } |
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107 | 0 | if (arrEmptyReferences != null) |
108 | 0 | m_arrListeners.removeAll(arrEmptyReferences); |
109 | 0 | } |
110 | 0 | } |
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} |