Add history filtering and fix stylesheet reference issue

Introduced filter functionality in HistoryManager to allow only the values passing the filter to be saved in history. In addition, corrected the misdirected reference to the user agent stylesheet in SearchTextField.

gemsfx/src/main/java/com/dlsc/gemsfx/SearchTextField.java

@@ -188,7 +188,7 @@ private StackPane createRightNode() {
 
     @Override
     public String getUserAgentStylesheet() {
-        return Objects.requireNonNull(SearchTextField2.class.getResource("search-text-field.css")).toExternalForm();
+        return Objects.requireNonNull(SearchTextField.class.getResource("search-text-field.css")).toExternalForm();
     }
 
     private ObjectProperty<Node> historyPlaceholder = new SimpleObjectProperty<>(this, "historyPlaceholder");

gemsfx/src/main/java/com/dlsc/gemsfx/util/HistoryManager.java

@@ -1,9 +1,11 @@
 package com.dlsc.gemsfx.util;
 
 import javafx.beans.property.IntegerProperty;
+import javafx.beans.property.ObjectProperty;
 import javafx.collections.ObservableList;
 
 import java.util.List;
+import java.util.function.Predicate;
 
 /**
  * The HistoryManager interface defines the standard operations to manage history storage
@@ -79,4 +81,26 @@ public interface HistoryManager<T> {
      */
     void setMaxHistorySize(int maxHistorySize);
 
+    /**
+     * Returns the property that holds the filter used when adding items to the history.
+     * Only items that pass the filter will be added to the history.
+     *
+     * @return the property containing the filter
+     */
+    ObjectProperty<Predicate<T>> filterProperty();
+
+    /**
+     * Sets a filter to be used when adding items to the history. Only items that pass the
+     * filter will be added to the history.
+     *
+     * @param filter The filter to apply.
+     */
+    void setFilter(Predicate<T> filter);
+
+    /**
+     * Gets the current filter used for adding items to the history.
+     *
+     * @return The current filter.
+     */
+    Predicate<T> getFilter();
 }

gemsfx/src/main/java/com/dlsc/gemsfx/util/PreferencesHistoryManager.java

@@ -13,6 +13,7 @@
 import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;
+import java.util.function.Predicate;
 import java.util.logging.Logger;
 import java.util.prefs.Preferences;
 import java.util.stream.Collectors;
@@ -127,7 +128,7 @@ public final void set(List<T> history) {
      * @param item the item to add
      */
     public final void add(T item) {
-        if (item != null) {
+        if (item != null && getFilter().test(item)) {
             history.remove(item);
             history.add(0, item);
             trimHistory();
@@ -203,6 +204,26 @@ public final void setMaxHistorySize(int maxHistorySize) {
         maxHistorySizeProperty().set(maxHistorySize);
     }
 
+    private final ObjectProperty<Predicate<T>> filter = new SimpleObjectProperty<>(this, "filter", it -> true);
+
+    /**
+     * Returns the property object for the filter used when adding items to the history.
+     * Only items that pass the filter will be added to the history.
+     *
+     * @return the property object for the filter
+     */
+    public final ObjectProperty<Predicate<T>> filterProperty() {
+        return filter;
+    }
+
+    public final Predicate<T> getFilter() {
+        return filter.get();
+    }
+
+    public final void setFilter(Predicate<T> filter) {
+        this.filter.set(filter);
+    }
+
     private final ObjectProperty<Preferences> preferences = new SimpleObjectProperty<>(this, "preferences");
 
     /**
@@ -242,7 +263,7 @@ private void trimHistory() {
      * @return the converted unique list of strings
      */
     private List<T> convertToUniqueList(List<T> history) {
-        return history.stream().distinct().filter(Objects::nonNull).limit(Math.max(0, getMaxHistorySize())).toList();
+        return history.stream().distinct().filter(Objects::nonNull).filter(getFilter()).limit(Math.max(0, getMaxHistorySize())).toList();
     }
 
     /**

gemsfx/src/main/java/com/dlsc/gemsfx/util/StringHistoryManager.java

@@ -1,6 +1,7 @@
 package com.dlsc.gemsfx.util;
 
 import javafx.util.StringConverter;
+import org.apache.commons.lang3.StringUtils;
 
 /**
  * Manages a history of string records using the Java Preferences API. This class specializes
@@ -43,10 +44,12 @@ public String fromString(String string) {
 
     public StringHistoryManager() {
         super(DEFAULT_STRING_CONVERTER);
+        setFilter(StringUtils::isNotEmpty);
     }
 
     public StringHistoryManager(String delimiter, String preferencesKey) {
         super(delimiter, preferencesKey, DEFAULT_STRING_CONVERTER);
+        setFilter(StringUtils::isNotEmpty);
     }
 
 }