Add the last 5 selected encodings to top of the encoding list by default

Author: junichi11

src/com/junichi11/netbeans/modules/encoding/options/EncodingOptions.java

@@ -0,0 +1,104 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright (c) 2018 Oracle and/or its affiliates. All rights reserved.
+ *
+ * Oracle and Java are registered trademarks of Oracle and/or its affiliates.
+ * Other names may be trademarks of their respective owners.
+ *
+ * The contents of this file are subject to the terms of either the GNU
+ * General Public License Version 2 only ("GPL") or the Common
+ * Development and Distribution License("CDDL") (collectively, the
+ * "License"). You may not use this file except in compliance with the
+ * License. You can obtain a copy of the License at
+ * http://www.netbeans.org/cddl-gplv2.html
+ * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
+ * specific language governing permissions and limitations under the
+ * License.  When distributing the software, include this License Header
+ * Notice in each file and include the License file at
+ * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the GPL Version 2 section of the License file that
+ * accompanied this code. If applicable, add the following below the
+ * License Header, with the fields enclosed by brackets [] replaced by
+ * your own identifying information:
+ * "Portions Copyrighted [year] [name of copyright owner]"
+ *
+ * If you wish your version of this file to be governed by only the CDDL
+ * or only the GPL Version 2, indicate your decision by adding
+ * "[Contributor] elects to include this software in this distribution
+ * under the [CDDL or GPL Version 2] license." If you do not indicate a
+ * single choice of license, a recipient has the option to distribute
+ * your version of this file under either the CDDL, the GPL Version 2 or
+ * to extend the choice of license to its licensees as provided above.
+ * However, if you add GPL Version 2 code and therefore, elected the GPL
+ * Version 2 license, then the option applies only if the new code is
+ * made subject to such option by the copyright holder.
+ *
+ * Contributor(s):
+ */
+package com.junichi11.netbeans.modules.encoding.options;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.prefs.Preferences;
+import org.openide.util.NbPreferences;
+
+/**
+ *
+ * @author junichi11
+ */
+public final class EncodingOptions {
+
+    private static final int LAST_SELECTED_ENCODINGS_DEFAULT_MAX_SIZE = 5;
+    private static final EncodingOptions INSTANCE = new EncodingOptions();
+    private static final String ENCODING = "encoding"; // NOI18N
+    private static final String LAST_SELECTED_ENCODINGS = "last.selected.encodings"; // NOI18N
+    private static final String LAST_SELECTED_ENCODINGS_MAX_SIZE = "last.selected.encodings.max.size"; // NOI18N
+    private static final String DELIMITER = "|"; // NOI18N
+
+    public static EncodingOptions getInstance() {
+        return INSTANCE;
+    }
+
+    private EncodingOptions() {
+    }
+
+    public int getLastSelectedEncodingsMaxSize() {
+        return getPreferences().getInt(LAST_SELECTED_ENCODINGS_MAX_SIZE, LAST_SELECTED_ENCODINGS_DEFAULT_MAX_SIZE);
+    }
+
+    public void setLastSelectedEncodingsMazSize(int max) {
+        getPreferences().putInt(LAST_SELECTED_ENCODINGS_MAX_SIZE, max);
+    }
+
+    public List<String> getLastSelectedEncodings() {
+        String encodingString = getPreferences().get(LAST_SELECTED_ENCODINGS, ""); // NOI18N
+        if (encodingString.isEmpty()) {
+            return Collections.emptyList();
+        }
+        String[] encodings = encodingString.split("\\" + DELIMITER); // NOI18N
+        return Arrays.asList(encodings);
+    }
+
+    public void setLastSelectedEncodings(String encoding) {
+        List<String> selectedEncodings = new ArrayList<>(getLastSelectedEncodings());
+        if (selectedEncodings.contains(encoding)) {
+            selectedEncodings.remove(encoding);
+            selectedEncodings.add(0, encoding);
+        } else {
+            if (selectedEncodings.size() >= getLastSelectedEncodingsMaxSize()) {
+                selectedEncodings.remove(getLastSelectedEncodingsMaxSize() - 1);
+            }
+            selectedEncodings.add(0, encoding);
+        }
+        String join = String.join(DELIMITER, selectedEncodings);
+        getPreferences().put(LAST_SELECTED_ENCODINGS, join);
+    }
+
+    private Preferences getPreferences() {
+        return NbPreferences.forModule(EncodingOptions.class).node(ENCODING);
+    }
+}

src/com/junichi11/netbeans/modules/encoding/ui/EncodingPanel.java

@@ -39,6 +39,7 @@
  */
 package com.junichi11.netbeans.modules.encoding.ui;
 
+import com.junichi11.netbeans.modules.encoding.options.EncodingOptions;
 import java.awt.Dimension;
 import java.awt.EventQueue;
 import java.awt.event.KeyAdapter;
@@ -47,6 +48,7 @@
 import java.awt.event.MouseListener;
 import java.nio.charset.Charset;
 import java.util.Collection;
+import java.util.List;
 import javax.swing.DefaultListModel;
 import javax.swing.JPanel;
 import javax.swing.event.DocumentEvent;
@@ -73,8 +75,23 @@ final class EncodingPanel extends JPanel {
      */
     public EncodingPanel(Charset encoding) {
         initComponents();
+        List<String> selectedEncodings = EncodingOptions.getInstance().getLastSelectedEncodings();
+        // add last 5 selected encodings to top of the list by default
+        selectedEncodings.forEach(e -> {
+            if (!e.equals(encoding.name())) {
+                encodingListModel.addElement(e);
+            }
+        });
+
+        // add the current encoding to top of the list
         CHARSETS.forEach((charset) -> {
-            encodingListModel.addElement(charset.name());
+            if (charset.name().equals(encoding.name())) {
+                encodingListModel.add(0, charset.name());
+            } else {
+                if (!selectedEncodings.contains(charset.name())) {
+                    encodingListModel.addElement(charset.name());
+                }
+            }
         });
         encodingList.setModel(encodingListModel);
         encodingList.setSelectedValue(encoding.name(), true);
@@ -214,7 +231,6 @@ private void initComponents() {
         );
     }// </editor-fold>//GEN-END:initComponents
 
-
     // Variables declaration - do not modify//GEN-BEGIN:variables
     private javax.swing.JTextField encodingFilterTextField;
     private javax.swing.JList<String> encodingList;

src/com/junichi11/netbeans/modules/encoding/ui/EncodingStatusLineElementProvider.java

@@ -40,6 +40,7 @@
 package com.junichi11.netbeans.modules.encoding.ui;
 
 import com.junichi11.netbeans.modules.encoding.OpenInEncodingQueryImpl;
+import com.junichi11.netbeans.modules.encoding.options.EncodingOptions;
 import java.awt.AWTEvent;
 import java.awt.BorderLayout;
 import java.awt.Component;
@@ -171,6 +172,8 @@ private static void changeEncoding(String selectedEncoding) {
             fileObject.setAttribute(OpenInEncodingQueryImpl.ENCODING, selectedEncoding);
             final DataObject dobj = DataObject.find(fileObject);
 
+            // save selected encoding to options
+            EncodingOptions.getInstance().setLastSelectedEncodings(selectedEncoding);
             UiUtils.reopen(dobj);
 
         } catch (IOException ex) {