Improved ExtendedProperties class.

src/main/java/com/jvms/i18neditor/Editor.java

@@ -417,7 +417,7 @@ private void restoreEditorState() {
 				settings.getIntegerProperty("window_width", 1024), 
 				settings.getIntegerProperty("window_height", 768)));
 		pack();
-		if (settings.containsKey("window_pos_x") && settings.containsKey("window_pos_y")) {
+		if (settings.containsKeys("window_pos_x", "window_pos_y")) {
 			setLocation(settings.getIntegerProperty("window_pos_x"), 
 						settings.getIntegerProperty("window_pos_y"));
 		} else {

src/main/java/com/jvms/i18neditor/util/ExtendedProperties.java

@@ -15,15 +15,53 @@
 /**
  * This class extends {@link Properties}.
  * 
- * <p>This implementation adds the ability to load and store properties from a given file path.<br> 
- * It also adds support to retrieve and store {@code Integer} and {@code List} values.</p>
+ * <p>This implementation adds the ability to load and store properties from a given file path  
+ * and adds support to retrieve and store {@code Integer} and {@code List} values.</p>
+ * 
+ * <p>This implementation also adds extended functionality like {@link #containsKeys(String...)}.</p>
  * 
  * @author Jacob
  */
 public class ExtendedProperties extends Properties {
 	private static final long serialVersionUID = 6042931434040718478L;
 
-	private static final String LIST_SEPARATOR = ",";
+	protected String separator;
+
+	/**
+     * Creates an empty property list with no default values and "," as list separator.
+     */
+	public ExtendedProperties() {
+		this(null, ",");
+	}
+
+	/**
+     * Creates an empty property list with no default values and the specified list separator.
+     * 
+     * @param	separator the separator used for storing list values.
+     */
+	public ExtendedProperties(String separator) {
+		this(null, separator);
+	}
+
+	/**
+     * Creates an empty property list with the specified defaults and "," as list separator.
+     * 
+     * @param	defaults the defaults.
+     */
+    public ExtendedProperties(Properties defaults) {
+        this(defaults, ",");
+    }
+
+	/**
+     * Creates an empty property list with the specified defaults and list separator.
+     * 
+     * @param	defaults the defaults.
+     * @param	separator the separator used for storing list values.
+     */
+    public ExtendedProperties(Properties defaults, String separator) {
+        super(defaults);
+        this.separator = separator;
+    }
 
 	/**
 	 * Reads a property list from the given file path.
@@ -55,13 +93,13 @@ public void store(Path path) {
 
 	/**
 	 * Sets a value in the property list. The list of values will be converted
-	 * to a single string separated by {@value #LIST_SEPARATOR}.
+	 * to a single string separated by {@value #separator}.
 	 * 
 	 * @param 	key the key to be placed in this property list.
 	 * @param 	values the value corresponding to {@code key}.
 	 */
 	public void setProperty(String key, List<String> values) {
-		setProperty(key, values.stream().collect(Collectors.joining(LIST_SEPARATOR)));
+		setProperty(key, values.stream().collect(Collectors.joining(separator)));
 	}
 
 	/**
@@ -84,7 +122,7 @@ public void setProperty(String key, Integer value) {
 	 */
 	public List<String> getListProperty(String key) {
 		String value = getProperty(key);
-		return value == null ? Lists.newLinkedList() : Lists.newLinkedList(Arrays.asList(value.split(LIST_SEPARATOR)));
+		return value == null ? Lists.newLinkedList() : Lists.newLinkedList(Arrays.asList(value.split(separator)));
 	}
 
 	/**
@@ -102,7 +140,7 @@ public Integer getIntegerProperty(String key) {
 	/**
 	 * See {@link #getIntegerProperty(String)}. This method returns {@code defaultValue} when
 	 * there is no value in the property list with the specified {@code key}.
-	 *  
+	 * 
 	 * @param	key the property key.
 	 * @param	defaultValue the default value to return when there is no value for the specified key
 	 * @return 	the value in this property list with the specified key value or the defaultValue
@@ -112,4 +150,15 @@ public Integer getIntegerProperty(String key, Integer defaultValue) {
 		Integer value = getIntegerProperty(key); 
 		return value != null ? value : defaultValue;
 	}
+
+	/**
+	 * This function does the same as {@link #containsKey(Object)}, only for multiple keys.
+	 * 
+	 * @param 	keys possible keys.
+	 * @return 	{@code true} if and only if the specified objects are keys in this hashtable, 
+	 * 			as determined by the equals method; false otherwise.
+	 */
+	public boolean containsKeys(String... keys) {
+		return Arrays.asList(keys).stream().allMatch(k -> containsKey(k));
+	}
 }