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/*
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* Angkor Web Framework
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*
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* Distributable under LGPL license.
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* See terms of license at gnu.org.
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*/
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package com.tirsen.angkor.table;
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import com.tirsen.angkor.event.ChangeListener;
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import com.tirsen.angkor.event.ChangeSourceHelper;
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/**
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* @author $Author: tirsen $
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* @version $Revision: 1.5 $
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* <BR>
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* $Id: AbstractTableModel.java,v 1.5 2002/10/09 21:37:37 tirsen Exp $
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*/
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public abstract class AbstractTableModel implements TableModel
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{
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private int start = 0;
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private int end = -1;
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private int rowCount = -1;
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private ChangeSourceHelper changeSourceHelper = new ChangeSourceHelper(this);
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/**
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* Sets the actual row count of this model. Values needs to be fetched beforehand for rows actually used by
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* the user of the model. If set to -1 the size of actual data is used instead.
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*/
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public void setRowCount(int rowCount)
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{
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this.rowCount = rowCount;
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}
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public int getRowCountInRange()
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{
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return getEnd() - getStart() + 1;
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}
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public int getRowCount()
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{
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return rowCount;
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}
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/**
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* If any number is set to a negative number it is subtracted from the number of rows.
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* As a special case of this setting end to -1 sets the range to the last row.
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*/
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public void setRange(int start, int end)
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{
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this.start = start;
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this.end = end;
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}
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public int getStart()
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{
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System.out.println("start = " + start);
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System.out.println("normalize(start) = " + normalize(start));
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return normalize(start);
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}
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public int getEnd()
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{
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return normalize(end);
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}
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private int normalize(int row)
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{
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int rows = getRowCount();
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if (rows == 0)
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row = 0;
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else
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{
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if (row < 0) row = rows + row;
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if (row >= rows) row = rows - 1;
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}
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return row;
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}
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public void empty()
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{
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setRowCount(-1);
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setRange(0, -1);
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}
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public void addChangeListener(ChangeListener listener)
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{
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changeSourceHelper.addChangeListener(listener);
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}
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public void removeChangeListener(ChangeListener listener)
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{
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changeSourceHelper.removeChangeListener(listener);
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}
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/**
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* Call this method when values of the model has changed, will fire a change event.
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*/
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protected void signalChanged()
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{
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changeSourceHelper.signalChangeEvent();
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}
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}
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