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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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| |
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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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| 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 =
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| (ITableDataModelListener) objRef.get(); |
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| if (objListener != null)
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| objListener.tableDataChanged(objEvent);
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| else { |
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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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| 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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| 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 =
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| (ITableDataModelListener) objRef.get(); |
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| if (objListener == objStoredListener || objStoredListener == null) {
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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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| } |