tablemodeldecorator.java

23种设计模式的java实现 include vistor,proxy,bridge

import javax.swing.table.TableModel;
import javax.swing.event.TableModelListener;

// TableModelDecorator implements TableModelListener. That
// listener interface defines one method: tableChanged(), which
// is called when the table model is changed. That method is
// not implemented in this abstract class; it's left for
// subclasses to implement.
public abstract class TableModelDecorator 
                        implements TableModel, TableModelListener {
   public TableModelDecorator(TableModel model) {
      this.realModel = model;   
      realModel.addTableModelListener(this);
   }

   // The following 9 methods are defined by the TableModel
   // interface; all of those methods forward to the real model.
   public void addTableModelListener(TableModelListener l) {
      realModel.addTableModelListener(l);
   }
   public Class getColumnClass(int columnIndex) {
      return realModel.getColumnClass(columnIndex);
   }
   public int getColumnCount() {
      return realModel.getColumnCount();   
   }
   public String getColumnName(int columnIndex) {
      return realModel.getColumnName(columnIndex);
   }
   public int getRowCount() {
      return realModel.getRowCount();   
   }
   public Object getValueAt(int rowIndex, int columnIndex) {
      return realModel.getValueAt(rowIndex, columnIndex);
   }
   public boolean isCellEditable(int rowIndex, int columnIndex) {
      return realModel.isCellEditable(rowIndex, columnIndex);
   }
   public void removeTableModelListener(TableModelListener l) {
      realModel.removeTableModelListener(l);
   }
   public void setValueAt(Object aValue, 
                        int rowIndex, int columnIndex) {
      realModel.setValueAt(aValue, rowIndex, columnIndex);
   }

   // The getRealModel method is used by subclasses to
   // access the real model.
   protected TableModel getRealModel() {
      return realModel;
   }

   private TableModel realModel; // We're decorating this model
}