i18n: Add support for collecting missing strings

src/org/hwo/i18n/Messages.java

@@ -1,9 +1,12 @@
 package org.hwo.i18n;
 
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Locale;
 import java.util.MissingResourceException;
+import java.util.Properties;
 import java.util.ResourceBundle;
 
 public class Messages {
@@ -17,6 +20,8 @@ public class Messages {
 	
 	private ResourceBundle defaultResourceBundle;
 	private ResourceBundle localeResourceBundle;
+	private Properties missingKeys;
+	private String missingKeysFileName;
 	
 	protected Messages() {
 		initialize();
@@ -27,6 +32,23 @@ public class Messages {
 		BUNDLE_NAME = bundleName;
 		initialize();
 	}
+
+	public void saveMissingStrings() {
+		
+		if (missingKeys != null)
+		{
+			System.err.println("Writing missing strings...");
+			
+			FileOutputStream fos;
+			try {
+				fos = new FileOutputStream(missingKeysFileName);
+				missingKeys.store(fos, "");
+				fos.close();
+			} catch (Exception e) {
+				e.printStackTrace();
+			}
+		}
+	}
 	
 	private void initialize()
 	{
@@ -37,12 +59,30 @@ public class Messages {
 		instanceList.add(this);
 	}
 	
+	public String getMissingKeysFileName()
+	{
+		return missingKeysFileName;
+	}
+	public void setMissingKeysFileName(String fileName)
+	{
+		missingKeysFileName = fileName;
+	}
+	
+	public void enableMissingKeys()
+	{
+		missingKeys = new Properties();
+	}
+	
 	public static String getString(String key) {
 		for (Messages messages: instanceList)
 		{
 			if (messages.hasKey(key))
 				return messages.getInstanceString(key);
 		}
+		if (getInstance().missingKeys != null)
+		{
+			getInstance().missingKeys.setProperty(key, "");
+		}
 		return '!' + key + '!';
 	}
 	
@@ -51,18 +91,13 @@ public class Messages {
 		return localeResourceBundle.containsKey(key) | defaultResourceBundle.containsKey(key);
 	}
 	
-	public String getInstanceString(String key)
+	protected String getInstanceString(String key) throws MissingResourceException
 	{
-		try {
-			if (localeResourceBundle.containsKey(key))
-				return localeResourceBundle.getString(key);
-			if (defaultResourceBundle.containsKey(key))
-				return defaultResourceBundle.getString(key);
-			return '!' + key + '!';
-		} catch (MissingResourceException e) {
-			return '!' + key + '!';
-		}
-
+		if (localeResourceBundle.containsKey(key))
+			return localeResourceBundle.getString(key);
+		if (defaultResourceBundle.containsKey(key))
+			return defaultResourceBundle.getString(key);
+		throw new MissingResourceException(BUNDLE_NAME, key, "");
 	}
 	
 	public static Messages getInstance()