eu.cedarsoft.utils.springrcp.selection.SelectionManager Maven / Gradle / Ivy

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package com.cedarsoft.utils.springrcp.selection;

import org.apache.commons.collections.MultiHashMap;
import org.apache.commons.collections.MultiMap;
import org.jetbrains.annotations.NotNull;
import org.springframework.richclient.application.Application;
import org.springframework.richclient.application.ApplicationWindow;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.WeakHashMap;

/**
 * 
 * Date: 22.08.2006

 * Time: 20:19:05

 *
 * @author Johannes Schneider -
 *         Xore Systems
 */
public class SelectionManager {
  @NotNull
  public static SelectionManager getInstance() {
    return ( SelectionManager ) Application.instance().getApplicationContext().getBean( "selectionManager" );
  }

  private Map windowSelectionManagers = new HashMap();

  /**
   * Returns the selection for the currently active window
   *
   * @param selectionType the type of the selection
   * @return the selection
   */
  @NotNull
  public  Selection getSelection( @NotNull Class selectionType ) {
    return getActiveWindowSelectionManager().getSelection( selectionType );
  }

  @NotNull
  public WindowSelectionManager getWindowSelectionManager( @NotNull ApplicationWindow activeWindow ) {
    WindowSelectionManager selectionManager = windowSelectionManagers.get( activeWindow );
    if ( selectionManager == null ) {
      selectionManager = new WindowSelectionManager();
      windowSelectionManagers.put( activeWindow, selectionManager );
    }
    return selectionManager;
  }

  @NotNull
  public WindowSelectionManager getActiveWindowSelectionManager() {
    ApplicationWindow activeWindow = Application.instance().getActiveWindow();
    return getWindowSelectionManager( activeWindow );
  }

  public static class WindowSelectionManager {
    private Map, Selection> selections; //todo listener notify when removed!?
    private MultiMap selectionListeners = new MultiHashMap();

    public WindowSelectionManager() {
      selections = new WeakHashMap, Selection>();
    }

    @NotNull
    public  Selection getSelection( @NotNull Class selectionType ) {
      Selection selection = selections.get( selectionType );
      if ( selection == null ) {
        selection = new DefaultSelection( selectionType );
        selections.put( selectionType, selection );
      }
      return ( Selection ) selection;
    }

    public  void setSelection( @NotNull Selection selection ) {
      selections.put( selection.getType(), selection );


      Collection listeners = ( Collection ) selectionListeners.get( selection.getType() );
      if ( listeners != null && !listeners.isEmpty() ) {
        for ( Object listener : listeners ) {
          ( ( SelectionListener ) listener ).notifySelectionChanged( selection );
        }
      }

      System.out.println( "new selection " + selection );
    }

    public  void addSelectionListener( Class beanType, SelectionListener listener ) {
      selectionListeners.put( beanType, listener );
    }
  }

  public interface SelectionListener {
    void notifySelectionChanged( @NotNull Selection selection );
  }
}