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   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
   *  with the License.  You may obtain a copy of the License at
   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   ****************************************************************/
  
  
  package org.apache.cayenne.modeler.dialog.pref;
  
  import java.awt.Component;
  import java.beans.PropertyChangeListener;
  import java.io.ByteArrayOutputStream;
  import java.io.OutputStreamWriter;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.Vector;
  
  import javax.swing.DefaultComboBoxModel;
  
  import org.apache.cayenne.modeler.util.CayenneController;
  import org.apache.cayenne.swing.BindingBuilder;
  import org.apache.cayenne.swing.ObjectBinding;
  import org.apache.cayenne.util.Util;
  
  /**
   * A controller for stream encoding picker component.
   * 
   */
  public class EncodingSelector extends CayenneController {
  
      public static final String ENCODING_PROPERTY_BINDING = "encoding";
  
      protected PropertyChangeListener encodingChangeListener;
      protected ObjectBinding defaultEncodingBinding;
      protected ObjectBinding otherEncodingBinding;
      protected ObjectBinding selectedEncodingBinding;
  
      protected EncodingSelectorView view;
      protected String systemEncoding;
      protected String encoding;
      protected boolean defaultEncoding;
  
      /**
       * Creates new EncodingPicker.
       */
      public EncodingSelector(CayenneController parent) {
          this(parent, new EncodingSelectorView());
      }
  
      public EncodingSelector(CayenneController parent, EncodingSelectorView view) {
          super(parent);
          this.view = view;
  
          initBindings();
      }
  
      public Component getView() {
          return view;
      }
  
      protected void initBindings() {
          // init static models...
          this.systemEncoding = detectPlatformEncoding();
  
          Vector allEncodings = supportedEncodings(systemEncoding);
          view.getEncodingChoices().setModel(new DefaultComboBoxModel(allEncodings));
          view.getDefaultEncodingLabel().setText("Default (" + systemEncoding + ")");
          view.getDefaultEncoding().setSelected(true);
  
          // create bindings...
          BindingBuilder builder = new BindingBuilder(
                  getApplication().getBindingFactory(),
                  this);
  
          this.defaultEncodingBinding = builder
                  .bindToStateChange(view.getDefaultEncoding(), "defaultEncoding");
  
          this.otherEncodingBinding = builder.bindToStateChange(view.getOtherEncoding(),
                  "otherEncoding");
  
          this.selectedEncodingBinding = builder.bindToComboSelection(view
                  .getEncodingChoices(), "encoding");
      }
  
      /**
       * Returns default encoding on the current platform.
       */
      protected String detectPlatformEncoding() {
          // this info is private until 1.5, so have to hack it...
          return new OutputStreamWriter(new ByteArrayOutputStream()).getEncoding();
      }
  
      /**
       * Returns an array of charsets that all JVMs must support cross-platform combined
       * with a default platform charset. See Javadocs for java.nio.charset.Charset for the
       * list of "standard" charsets.
       */
      protected Vector supportedEncodings(String platformEncoding) {
          String[] defaultCharsets = new String[] {
                  "US-ASCII", "ISO-8859-1", "UTF-8", "UTF-16BE", "UTF-16LE", "UTF-16"
          };
  
          Vector charsets = new Vector(Arrays.asList(defaultCharsets));
          if (!charsets.contains(platformEncoding)) {
              charsets.add(platformEncoding);
          }
  
          Collections.sort(charsets);
          return charsets;
      }
  
      public void bindingUpdated(String expression, Object newValue) {
          if (ENCODING_PROPERTY_BINDING.equals(expression)) {
              this.encoding = (newValue != null) ? newValue.toString() : null;
              this.defaultEncoding = encoding == null || encoding.equals(systemEncoding);
  
              selectedEncodingBinding.updateView();
              if (defaultEncoding) {
                  defaultEncodingBinding.updateView();
                  view.getEncodingChoices().setEnabled(false);
                  view.getDefaultEncodingLabel().setEnabled(true);
              }
              else {
                  otherEncodingBinding.updateView();
                  view.getEncodingChoices().setEnabled(true);
                  view.getDefaultEncodingLabel().setEnabled(false);
              }
          }
      }
  
      // ===============
      //    Properties
      // ===============
  
      public void setEncoding(String encoding) {
          if (!Util.nullSafeEquals(this.encoding, encoding)) {
              Object old = this.encoding;
  
              this.encoding = encoding;
              firePropertyChange("encoding", old, encoding);
          }
      }
  
      public String getEncoding() {
          return encoding;
      }
  
      public boolean isDefaultEncoding() {
          return defaultEncoding;
      }
  
      public void setDefaultEncoding(boolean b) {
          if (b != defaultEncoding) {
              this.defaultEncoding = b;
  
              if (b) {
                  setEncoding(systemEncoding);
                  view.getEncodingChoices().setEnabled(false);
                  view.getDefaultEncodingLabel().setEnabled(true);
              }
              else {
                  view.getEncodingChoices().setEnabled(true);
                  view.getDefaultEncodingLabel().setEnabled(false);
              }
  
          }
      }
  
      public boolean isOtherEncoding() {
          return !isDefaultEncoding();
      }
  
      public void setOtherEncoding(boolean b) {
          setDefaultEncoding(!b);
      }
  }
  