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//---PACKAGE DECLARATION--- |
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package uk.ac.ukc.iscream.core.loggers; |
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package uk.org.iscream.core.loggers; |
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//---IMPORTS--- |
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import uk.ac.ukc.iscream.core.LoggerImpl; |
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import uk.ac.ukc.iscream.core.Logger; |
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import uk.org.iscream.util.*; |
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import uk.org.iscream.core.*; |
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import java.util.Date; |
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import java.text.DateFormat; |
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import java.util.Locale; |
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* |
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* All very simple really... |
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* |
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* This class does have the problem that if too many messages are |
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* entered into the text area, then it will fill the memory of |
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* the JVM. This MAY have been fixed by adding the setRows(int) |
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* in the write(string) method, however the Java API does not |
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* specify if this enforces the max rows, but I THINK it does. |
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* |
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* @author $Author$ |
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* @version $Id$ |
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*/ |
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class SimpleGUILogger implements LoggerImpl { |
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public class SimpleGUILogger implements LoggerImpl { |
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//---FINAL ATTRIBUTES--- |
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* Creates a new ScreenLoggerServant. |
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*/ |
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public SimpleGUILogger() { |
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_verbosityLevel = Integer.parseInt(System.getProperty("uk.ac.ukc.iscream.Verbosity")); |
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_maxMessages = Integer.parseInt(System.getProperty("uk.org.iscream.LoggerClass.SimpleGUILogger.maxMessages")); |
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getFrame().add(getTextArea()); |
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getFrame().setSize(500,500); |
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getFrame().setVisible(true); |
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write(this.toString(), Logger.SYSINIT, "started"); |
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write(this.toString(), Logger.SYSMSG, "using verbosity " + _verbosityLevel); |
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write(toString(), Logger.SYSINIT, "started"); |
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} |
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//---PUBLIC METHODS--- |
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/** |
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* The write() method takes a message, formats it using the |
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* formatLogLine() method, and then outputs it to the screen |
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* using System.out.println(). The source is usually the |
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* calling object, referenced by `this'. The method has been |
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* made synchronized to avoid it being called by two different |
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* objects and the output ending up merged on the screen. |
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* The write() method takes a line of text, pre-formatted |
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* and outputs it using a method defined by the actual |
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* implementation. The verbosity is given in case the |
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* implementation wishes to utilise it in the layout - |
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* eg. a different colour or font. |
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* |
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* @param source A string representation of the calling object. |
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* This instance writes the line to a simple GUI message |
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* window. |
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* |
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* @param line A line of formatted text to be logged |
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* @param verbosity the verbosity of this message |
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* @param message The text to be logged. |
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*/ |
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public synchronized void write(String source, int verbosity, String message) { |
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if (verbosity <= _verbosityLevel) { |
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String line = formatLogLine(source, message); |
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getTextArea().append(line + "\n"); |
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} |
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*/ |
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public synchronized void write(String line, int verbosity) { |
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getTextArea().append(line + "\n"); |
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getTextArea().setRows(_maxMessages); |
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} |
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/** |
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/** |
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* Overrides the {@link java.lang.Object#toString() Object.toString()} |
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* method to provide clean logging (every class should have this). |
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* |
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* This uses the uk.org.iscream.util.FormatName class |
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* to format the toString() |
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* |
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* @return the name of this class and its CVS revision |
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*/ |
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public String toString() { |
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return this.getClass().getName() + "(" + REVISION.substring(11, REVISION.length() - 2) + ")"; |
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//return "ScreenLogger" + "(" + REVISION.substring(11, REVISION.length() - 2) + ")"; |
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return FormatName.getName( |
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_name, |
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getClass().getName(), |
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REVISION); |
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} |
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//---PRIVATE METHODS--- |
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/** |
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* This method generates a nicely formatted line for the log, |
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* including the date/time and the source of the message. The date |
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* and time are formatted using the DateFormat class, and the source |
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* class is formatted using the toString() method found in every |
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* source file. This is then prepended to the message and returned. |
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* |
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* @param source A string representation of the calling object. |
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* @param message The message to be logged. |
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* @return The string to be written to the log. |
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*/ |
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private String formatLogLine(String source, String message){ |
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String date = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.MEDIUM).format(new Date()); |
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return "[" + date + "] " + source + ": " + message; |
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/** |
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* This method is provided if this class wishes to log |
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* a message itself. |
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* |
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* @param source A String representation of the source |
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* @param verbosity the verbosity of this message |
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* @param message The message to log |
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*/ |
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private void write(String source, int verbosity, String message) { |
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write(FormatName.formatLogLine(source, verbosity, message), verbosity); |
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} |
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//---ACCESSOR/MUTATOR METHODS--- |
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// an accessor for the frame |
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/** |
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* An accessor for the frame |
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* |
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* @return the frame for this class |
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*/ |
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private Frame getFrame(){ |
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return frame; |
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} |
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// an accessor for the text area |
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/** |
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* an accessor for the text area |
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* |
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* @return the text area |
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*/ |
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private TextArea getTextArea(){ |
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return textArea; |
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} |
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// class attributes: |
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// a frame |
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private Frame frame = new Frame("I-SCREAM CORE LOGGER"); |
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// a text area |
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private TextArea textArea = new TextArea(100,100); |
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//---ATTRIBUTES--- |
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/** |
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* a frame |
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*/ |
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private Frame frame = new Frame("I-SCREAM LOGGER"); |
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/** |
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* The verbosity level of this instance |
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*/ |
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private int _verbosityLevel; |
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/** |
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* a text area |
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*/ |
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private TextArea textArea = new TextArea(100,100); |
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/** |
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* This is the friendly identifier of the |
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* component this class is running in. |
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* eg, a Filter may be called "filter1", |
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* If this class does not have an owning |
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* component, a name from the configuration |
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* can be placed here. This name could also |
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* be changed to null for utility classes. |
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*/ |
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private String _name = Core.NAME; |
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/** |
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* The maximum number of messages that can |
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* be displayed before bottom items are removed. |
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* This is needed to fix the memory overload problem |
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* that was seen when the GUI got too full! |
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*/ |
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private int _maxMessages; |
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//---STATIC ATTRIBUTES--- |
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