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The Open Source version of the IBM Toolbox for Java
///////////////////////////////////////////////////////////////////////////////
//
// JTOpen (IBM Toolbox for Java - OSS version)
//
// Filename: DBCellRenderer.java
//
// The source code contained herein is licensed under the IBM Public License
// Version 1.0, which has been approved by the Open Source Initiative.
// Copyright (C) 1997-2000 International Business Machines Corporation and
// others. All rights reserved.
//
///////////////////////////////////////////////////////////////////////////////
package com.ibm.as400.vaccess;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.border.EmptyBorder;
import java.awt.Component;
import java.awt.Dimension;
/**
The DBCellRenderer class renders a value by using a string
representation of the value.
Null values are represented using a dash.
**/
class DBCellRenderer
extends DefaultTableCellRenderer
{
private static final String copyright = "Copyright (C) 1997-2000 International Business Machines Corporation and others.";
/**
Constructs a DBCellRenderer object.
**/
public DBCellRenderer ()
{
this (SwingConstants.LEFT);
}
/**
Constructs a DBCellRenderer object.
@param horizontalAlignment One of the following SwingConstants: LEFT, RIGHT, or CENTER.
**/
public DBCellRenderer (int horizontalAlignment)
{
super ();
setHorizontalAlignment (horizontalAlignment);
setBorder (new EmptyBorder (0,5,0,5));
}
/**
Converts a byte array to a string of hex digits.
@param data The data to convert to hex characters.
@return A string containing the hexidecimal representation
of data.
**/
String getHexDigits(byte[] data)
{
StringBuffer result = new StringBuffer();
for (int i = 0; i < data.length; i++)
{
int leftDigitValue = (data[i] >>> 4) & 0xf;
int rightDigitValue = data[i] & 0xf;
char rightDigit = rightDigitValue < 10 ?
(char) (48 + rightDigitValue) :
(char) (rightDigitValue - 10 + 65);
char leftDigit = leftDigitValue < 10 ?
(char) (48 + leftDigitValue) :
(char) (leftDigitValue - 10 + 65);
result.append(leftDigit);
result.append(rightDigit);
}
return result.toString();
}
/**
Renders the value for a table.
@param table The table.
@param value The value.
@param selected true if the item is selected; false otherwise.
@param hasFocus true if the item has focus; false otherwise.
@param rowIndex The row index.
@param columnIndex The column index.
@return The rendered component.
**/
public Component getTableCellRendererComponent (JTable table,
Object value,
boolean selected,
boolean hasFocus,
int rowIndex,
int columnIndex)
{
// Note that subclasses count on this method calling getText().
String v = getText(value);
setText (v);
return super.getTableCellRendererComponent(
table, v, selected, hasFocus, rowIndex, columnIndex);
}
/**
Returns the text representation for this object.
@param value The object for which to get the text representation for.
@return The text representation of the object.
**/
public String getText(Object value)
{
if (value == null)
{
return "-";
}
else if (value instanceof byte[])
{
return getHexDigits((byte[])value);
}
return value.toString();
}
}