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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() |
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{ |
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m_arrListeners = new ArrayList(); |
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} |
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protected void fireTableDataModelEvent(CTableDataModelEvent objEvent) |
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{ |
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synchronized(m_arrListeners) |
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{ |
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List arrEmptyReferences = null; |
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for(Iterator it = m_arrListeners.iterator(); it.hasNext();) |
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{ |
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WeakReference objRef = (WeakReference) it.next(); |
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ITableDataModelListener objListener = (ITableDataModelListener) objRef |
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.get(); |
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if (objListener != null) |
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objListener.tableDataChanged(objEvent); |
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else |
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{ |
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if (arrEmptyReferences == null) |
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arrEmptyReferences = new ArrayList(); |
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arrEmptyReferences.add(objRef); |
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} |
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} |
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if (arrEmptyReferences != null) |
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m_arrListeners.removeAll(arrEmptyReferences); |
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} |
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} |
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public void addTableDataModelListener(ITableDataModelListener objListener) |
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{ |
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synchronized(m_arrListeners) |
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{ |
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m_arrListeners.add(new WeakReference(objListener)); |
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} |
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} |
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public void removeTableDataModelListener(ITableDataModelListener objListener) |
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{ |
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synchronized(m_arrListeners) |
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{ |
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List arrEmptyReferences = null; |
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for(Iterator it = m_arrListeners.iterator(); it.hasNext();) |
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{ |
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WeakReference objRef = (WeakReference) it.next(); |
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ITableDataModelListener objStoredListener = (ITableDataModelListener) objRef |
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.get(); |
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if (objListener == objStoredListener |
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|| objStoredListener == null) |
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{ |
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if (arrEmptyReferences == null) |
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arrEmptyReferences = new ArrayList(); |
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arrEmptyReferences.add(objRef); |
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} |
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} |
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if (arrEmptyReferences != null) |
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m_arrListeners.removeAll(arrEmptyReferences); |
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} |
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} |
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} |