Find attached a patch which uses a series of strategies to initialise the
Swing L&F. Currently it looks for a system Property "chainsaw.laf" with a
classname, and uses that if set, otherwise defaults to the System Look and
Feel. More strategy definitions are easy to plug-in.
I've tested this against the Metouia L&F @ http://mlf.sourceforge.net/
cheers,
Paul Smith
<<patch-chainsaw-laf-strategies.txt>>
*** Start.java 18 Mar 2003 13:33:32 -0000 1.5
--- Start.java 19 Mar 2003 00:01:16 -0000
***************
*** 49,70 ****
package org.apache.log4j.chainsaw;
- import org.apache.log4j.Level;
- import org.apache.log4j.LogManager;
- import org.apache.log4j.xml.DOMConfigurator;
-
import java.io.File;
-
import java.net.MalformedURLException;
import java.net.URL;
-
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;
/**
* Main initialization point of Chainsaw
--- 49,69 ----
package org.apache.log4j.chainsaw;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import javax.swing.JFileChooser;
+ import javax.swing.UIManager;
import javax.swing.filechooser.FileFilter;
+ import org.apache.log4j.Level;
+ import org.apache.log4j.LogManager;
+ import org.apache.log4j.xml.DOMConfigurator;
+
/**
* Main initialization point of Chainsaw
***************
*** 73,83 ****
--- 72,174 ----
*/
public class Start {
private static final String LOG4J_CONFIG_FILE = "log4j.xml";
+ private static final String CHAINSAW_LAF_PROPERTY = "chainsaw.laf";
public static void main(String[] args) {
+ initLookAndFeel();
initLog4J();
}
+ /**
+ * Initialises the Look and Feel, by using a Strategy Pattern
+ */
+ private static void initLookAndFeel() {
+ new LookAndFeelStrategyChain().initLookAndFeel();
+ }
+
+ private static interface LookAndFeelStrategy {
+ public boolean initLookAndFeel();
+ }
+
+ /**
+ * A strategy chain that attempt to init the Swing L&F system by
+ * using a number of different methods in succession until it one
+ * reports that it worked ok
+ * @author Paul Smith
+ * @version 1.0
+ */
+ private static class LookAndFeelStrategyChain implements LookAndFeelStrategy {
+
+ private LookAndFeelStrategyChain() {
+ /** @todo add any other method for initializing L&F */
+ strategies.add(new SystemPropertyLookAndFeelStrategy());
+ strategies.add(new DefaultLookAndFeelStrategy());
+ }
+
+ public boolean initLookAndFeel()
+ {
+ for (Iterator i = strategies.iterator(); i.hasNext(); ) {
+ LookAndFeelStrategy item = (LookAndFeelStrategy)i.next();
+ if(item.initLookAndFeel()) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ private Collection strategies = new ArrayList();
+ }
+
+ /**
+ * The default strategy just tries to get the System L&F and set that
+ * @author Paul Smith
+ */
+ private static class DefaultLookAndFeelStrategy
+ implements LookAndFeelStrategy {
+
+ public boolean initLookAndFeel() {
+ try {
+ UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
+ return true;
+ }
+ catch (Exception ex) {
+
+ }
+ return false; // oh well!
+ }
+ }
+
+ /**
+ * Looks for a System property "chainsaw.laf" and if set,
+ * attempts to set the L&F by using that property value as a class name,
+ * if any error occurs (e.g. can't find the class), then this strategy
+ * will return false to indicate failure
+ * @author Paul Smith
+ * @version 1.0
+ */
+ private static class SystemPropertyLookAndFeelStrategy
+ implements LookAndFeelStrategy {
+
+ public boolean initLookAndFeel() {
+ String lookAndFeelProperty = System.getProperty(CHAINSAW_LAF_PROPERTY);
+ try {
+ if(lookAndFeelProperty != null
+ && lookAndFeelProperty.trim().length() > 0) {
+ UIManager.setLookAndFeel(lookAndFeelProperty);
+ return true;
+ }
+ }
+ catch (Exception ex) {
+ ex.printStackTrace();
+ return false;
+ }
+ return false;
+ }
+ }
+
+ /**
+ * Initialises the Log4j sub-system
+ */
private static void initLog4J() {
/** initialise log4j **/
final FinderStrategies strategies = new FinderStrategies();
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