rwtablemodel.java

用于串口通讯测试的工具软件。完全使用java语言编写。

package com.zcsoft.swing;

import javax.swing.table.DefaultTableModel;
import javax.swing.event.TableModelEvent;
import java.util.Vector;
/**
 * 只读或可修改的表格数据模型。默认为只读模式。
 *
 */
public class RWTableModel extends DefaultTableModel
{
  /** 是否可以编辑标记 */
	private boolean cellEditable = false;
	/**
	 *  Constructs a default <code>DefaultTableModel</code>
	 *  which is a table of zero columns and zero rows.
	 */
	public RWTableModel(){}

	/**
	 *  Constructs a <code>DefaultTableModel</code> with as many
	 *  columns as there are elements in <code>columnNames</code>
	 *  and <code>numRows</code> of <code>null</code>
	 *  object values.  Each column's name will be taken from
	 *  the <code>columnNames</code> array.
	 *
	 * @param columnNames       <code>array</code> containing the names
	 *				of the new columns.  If this is
	 *                          <code>null</code> then the model has no columns
	 * @param numRows           the number of rows the table holds
	 * @see #setDataVector
	 * @see #setValueAt
	 */
	public RWTableModel(Object[] columnNames, int numRows)
	{
		super(columnNames, numRows);
	}

	/**
	 * Returns whether the cells is editble.
	 *
	 * @param   row             the row whose value is to be queried
	 * @param   column          the column whose value is to be queried
	 * @return                  true
	 * @see #setCellEditable(boolean)
	 */
	public boolean isCellEditable(int row, int column)
	{
		return cellEditable;
	}

	/**
	 * Sets whether all cells is editable.
	 * @param editable  whether the cells is editable.
	 */
	public void setCellEditable(boolean editable)
	{
		this.cellEditable=editable;
	}


	/**
	 *  Replaces the current <code>dataVector</code> instance variable with the
	 *  new Vector of rows, <code>newData</code>.
	 *  Each row in <code>newData</code>
	 *  is adjusted to match the number of columns in <code>columnNames</code>
	 *  either by truncating the <code>Vector</code> if it is too long,
	 *  or adding <code>null</code> values if it is too short.
	 *  <p>
	 *
	 * @param  newData  the new data vector
	 */
	public void setDataVector(Vector newData)
	{
		//不是dataVector.setSize(0);为的是删除时会激发一些事件
		//不能这样处理，因为这样做破坏了原来的数据。而设置该属性
		//不应该影响外部资源
		//this.setNumRows(0);
		//直接调用事件通知就可以了
		if(this.getRowCount() > 0)
		{
			fireTableRowsDeleted(0, this.getRowCount() - 1);
		}
		if (newData == null)
		{
			//debug 03-08-17 蒋智湘
			//return;
			dataVector = new Vector(0);
		}
		else
		{
			dataVector = newData;
		}
		newRowsAdded(new TableModelEvent(this, 0, getRowCount()-1,
							 TableModelEvent.ALL_COLUMNS, TableModelEvent.INSERT));
	}

	/**
	 *  Replaces the current <code>dataVector</code> instance variable with the
	 *  new Vector of rows, <code>newData</code>.
	 *  <code>columnNames</code> are the names
	 *  of the new columns.  The first name in <code>columnNames</code> is
	 *  mapped to column 0 in <code>newData</code>. Each row in
	 *  <code>newData</code>
	 *  is adjusted to match the number of columns in <code>columnNames</code>
	 *  either by truncating the <code>Vector</code> if it is too long,
	 *  or adding <code>null</code> values if it is too short.
	 *  <p>
	 *
	 * @param   newData         the new data vector
	 * @param   columnNames     the names of the columns
	 * @see #getDataVector
	 */
	public void setDataVector(Vector newData, Vector columnNames)
	{
		if(newData==null)
			newData = new  Vector(0);
		super.setDataVector(newData,columnNames);
	}

	/**
	 * 添加多行记录。
	 * @param rows 每个成员为Vector实例的Vector实例或null。
	 *      确保每个成员的size同数据模型的列数相等。
	 *
	 */
	public void addRows(Vector rows)
	{
		int appendCnt = rows != null?rows.size():0;
		if(appendCnt < 1)
			return;
		int old = getRowCount();
		//--姚立成 2003-10-30日改，为了统一增加接口
		for (int i = 0; i < rows.size(); i++)
		{
			addRow((Vector)rows.get(i));
		}

		//dataVector.addAll(rows);
		// Generate notification
		newRowsAdded(new TableModelEvent(this, old, getRowCount() - 1,
							 TableModelEvent.ALL_COLUMNS, TableModelEvent.INSERT));
	}

	/**
	 * 用指定的数据行向量替换原有指定行上的全部内容
	 * @param row 待更新行的索引
	 * @param newRow 替换后的数据行向量。如果为null，则视同空行即new Vector()
	 */
	public void replaceRow(int row, Vector newRow)
	{
		if(newRow == null)
		{
			newRow = new Vector();
		}
		newRow.setSize(this.getColumnCount());
		dataVector.set(row, newRow);
		fireTableChanged(new TableModelEvent(this, row, row, TableModelEvent.ALL_COLUMNS));
	}

	/**
	 * 删除多行记录。
	 * 真正删除前，方法完成对rowIndexes进行按升序排序操作，
	 *  确保从低索引往高索引方向依个删除。
	 * @param rowIndexes 要删除的行的索引。各索引的值为删除前的索引值。
	 * @exception IndexOutOfBoundsException 某个索引值rowIndexes[i]不存在
	 *
	 */
	public void removeRows(int rowIndexes[])
	{
		if (rowIndexes == null || rowIndexes.length < 1 )
		{
			return;
		}
		java.util.Arrays.sort(rowIndexes);//排序很快
		synchronized(dataVector)
		{
			int len = rowIndexes.length;
			int cnt = dataVector.size();
			Vector nw = new Vector(cnt - len);//在原有数据行上删除待删除行后的数据
			if (len == cnt)
			{
				this.setDataVector(nw);
			}
			else//如果数据很多，则很慢
			{
				int start = -1,
					end = 0;
				for (int i = 0; i < len; i++)
				{
					end = rowIndexes[i];
					if (end - start > 1)//不是相邻的两行，则保留之间的行
					{
						nw.addAll(dataVector.subList(start+1, end));
					}
					start = end;
				}
				if (++end < cnt)//要删除的最末行后还有不删除的行
				{
					nw.addAll(dataVector.subList(end, cnt));
				}
				this.setDataVector(nw);
			}
		}
	}

	/**
	 * 获取模型的中一整行表格单元数据构成的向量
	 * @param index
	 * @return
	 */
	public Vector getRow(int index)
	{
		return (Vector)dataVector.get(index);
	}

}