conient/datacomponents/StringDataComponent.java

//---PACKAGE DECLARATION---
package uk.ac.ukc.iscream.conient.datacomponents;

//---IMPORTS---
import javax.swing.JLabel;
import javax.swing.JTextField;
import java.awt.GridLayout;
import javax.swing.SwingUtilities;

/**
 * This is the most basic of DataComponents.
 *
 * It simply displays the value as a String
 * in a JTextField.
 *
 * @author  $Author: ajm4 $
 * @version $Id: StringDataComponent.java,v 1.8 2001/01/29 12:23:25 ajm4 Exp $
 */
public class StringDataComponent extends VisibleDataComponent {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.8 $";
    
    /**
     * The default length of the JTextField
     */
    private final int DEFAULT_TEXT_LENGTH = 20;

//---STATIC METHODS---

//---CONSTRUCTORS---

    /**
     * Creates the component with a friendly name to be 
     * used as label
     *
     * @param name the friendly name
     * @param attribute the data attribute we look after
     */
    public StringDataComponent(String name, String attribute) {
        _name = name;
        _attribute = attribute;
        _item = new JTextField("", DEFAULT_TEXT_LENGTH);
        _item.setEditable(false);
        _label = new JLabel(_name + ": ");
        _label.setHorizontalAlignment(JLabel.RIGHT);
        setLayout(new GridLayout(1, 2));
        add(_label);
        add(_item);
    }

//---PUBLIC METHODS---

    /**
     * This run method updates any Swing components
     * The setValue() method adds this component
     * to the Swing Event Dispatching Queue to
     * run this method.
     */
    public void run() {
        _item.setText(_cache);
    }
    
    /**
     * Overrides the {@link java.lang.Object#toString() Object.toString()}
     * method to provide clean logging (every class should have this).
     *
     * @return the name of this class and its CVS revision
     */
    public String toString() {
        return _name + "(" + _attribute + ")";
    }

//---PRIVATE METHODS---

//---ACCESSOR/MUTATOR METHODS---

    /**
     * This takes the String value of the parameter that this component
     * is monitoring direct from the packet, it then performs all
     * approriate conversions and adds this class to the Swing Event
     * Dispatching queue.
     *
     * @param value the value for this data component
     * @throws DataFormatException if there was a problem converting the data for display
     */
    public void setValue(String value) throws DataFormatException {
        try {
            if(!_cache.equals(value)) {
                _cache = value;
                SwingUtilities.invokeLater(this);
            }
        } catch (Exception e) {
            throw new DataFormatException(value + " is an invalid data type for " + toString());
        }
    }        

//---ATTRIBUTES---

    /**
     * The friendly name of this component
     */
    private String _name;
    
    /**
     * The attribute that this component is concerned with
     */
    private String _attribute;

    /**
     * The friendly label for this component
     */
    protected JLabel _label;
    
    /**
     * Remebers what the last value was, so we
     * only update if we have to.
     */    
    String _cache = "";
    
    /**
     * The length of the JTextField
     */
    protected int _displayLength;
    
    /**
     * Just a normal label to display our value as a String
     */
    protected JTextField _item;

//---STATIC ATTRIBUTES---

}
Revision:	1.9
Committed:	Mon Jan 29 12:27:52 2001 UTC (23 years, 4 months ago) by ajm
Branch:	MAIN
Changes since 1.8:	+3 -2 lines
Log Message:	Fixed bug - wasn't queueing gui updates
#	Content
1	//---PACKAGE DECLARATION---
2	package uk.ac.ukc.iscream.conient.datacomponents;
3
4	//---IMPORTS---
5	import javax.swing.JLabel;
6	import javax.swing.JTextField;
7	import java.awt.GridLayout;
8	import javax.swing.SwingUtilities;
9
10	/**
11	* This is the most basic of DataComponents.
12	*
13	* It simply displays the value as a String
14	* in a JTextField.
15	*
16	* @author $Author: ajm4 $
17	* @version $Id: StringDataComponent.java,v 1.8 2001/01/29 12:23:25 ajm4 Exp $
18	*/
19	public class StringDataComponent extends VisibleDataComponent {
20
21	//---FINAL ATTRIBUTES---
22
23	/**
24	* The current CVS revision of this class
25	*/
26	public final String REVISION = "$Revision: 1.8 $";
27
28	/**
29	* The default length of the JTextField
30	*/
31	private final int DEFAULT_TEXT_LENGTH = 20;
32
33	//---STATIC METHODS---
34
35	//---CONSTRUCTORS---
36
37	/**
38	* Creates the component with a friendly name to be
39	* used as label
40	*
41	* @param name the friendly name
42	* @param attribute the data attribute we look after
43	*/
44	public StringDataComponent(String name, String attribute) {
45	_name = name;
46	_attribute = attribute;
47	_item = new JTextField("", DEFAULT_TEXT_LENGTH);
48	_item.setEditable(false);
49	_label = new JLabel(_name + ": ");
50	_label.setHorizontalAlignment(JLabel.RIGHT);
51	setLayout(new GridLayout(1, 2));
52	add(_label);
53	add(_item);
54	}
55
56	//---PUBLIC METHODS---
57
58	/**
59	* This run method updates any Swing components
60	* The setValue() method adds this component
61	* to the Swing Event Dispatching Queue to
62	* run this method.
63	*/
64	public void run() {
65	_item.setText(_cache);
66	}
67
68	/**
69	* Overrides the {@link java.lang.Object#toString() Object.toString()}
70	* method to provide clean logging (every class should have this).
71	*
72	* @return the name of this class and its CVS revision
73	*/
74	public String toString() {
75	return _name + "(" + _attribute + ")";
76	}
77
78	//---PRIVATE METHODS---
79
80	//---ACCESSOR/MUTATOR METHODS---
81
82	/**
83	* This takes the String value of the parameter that this component
84	* is monitoring direct from the packet, it then performs all
85	* approriate conversions and adds this class to the Swing Event
86	* Dispatching queue.
87	*
88	* @param value the value for this data component
89	* @throws DataFormatException if there was a problem converting the data for display
90	*/
91	public void setValue(String value) throws DataFormatException {
92	try {
93	if(!_cache.equals(value)) {
94	_cache = value;
95	SwingUtilities.invokeLater(this);
96	}
97	} catch (Exception e) {
98	throw new DataFormatException(value + " is an invalid data type for " + toString());
99	}
100	}
101
102	//---ATTRIBUTES---
103
104	/**
105	* The friendly name of this component
106	*/
107	private String _name;
108
109	/**
110	* The attribute that this component is concerned with
111	*/
112	private String _attribute;
113
114	/**
115	* The friendly label for this component
116	*/
117	protected JLabel _label;
118
119	/**
120	* Remebers what the last value was, so we
121	* only update if we have to.
122	*/
123	String _cache = "";
124
125	/**
126	* The length of the JTextField
127	*/
128	protected int _displayLength;
129
130	/**
131	* Just a normal label to display our value as a String
132	*/
133	protected JTextField _item;
134
135	//---STATIC ATTRIBUTES---
136
137	}