From 7badfcf8cf7f860f0a652619fd49ac2453a45438 Mon Sep 17 00:00:00 2001
From: Mateusz Warowny <mmzwarowny@dundee.ac.uk>
Date: Mon, 27 Mar 2023 17:34:06 +0200
Subject: [PATCH] JAL-4155 Replace unsafe casting to AlignmentPanel with
 generics

---
 src/jalview/appletgui/AlignViewport.java     |    2 +-
 src/jalview/gui/AlignViewport.java           |   17 ++---------------
 src/jalview/viewmodel/AlignmentViewport.java |   18 +++++++++++-------
 3 files changed, 14 insertions(+), 23 deletions(-)

diff --git a/src/jalview/appletgui/AlignViewport.java b/src/jalview/appletgui/AlignViewport.java
index 7369c3c..b42e15c 100644
--- a/src/jalview/appletgui/AlignViewport.java
+++ b/src/jalview/appletgui/AlignViewport.java
@@ -41,7 +41,7 @@ import jalview.viewmodel.AlignmentViewport;
 import java.awt.Font;
 import java.awt.FontMetrics;
 
-public class AlignViewport extends AlignmentViewport
+public class AlignViewport extends AlignmentViewport<AlignmentPanel>
         implements SelectionSource
 {
   boolean cursorMode = false;
diff --git a/src/jalview/gui/AlignViewport.java b/src/jalview/gui/AlignViewport.java
index 79a16ba..04618af 100644
--- a/src/jalview/gui/AlignViewport.java
+++ b/src/jalview/gui/AlignViewport.java
@@ -72,7 +72,7 @@ import javax.swing.JInternalFrame;
  * @author $author$
  * @version $Revision: 1.141 $
  */
-public class AlignViewport extends AlignmentViewport
+public class AlignViewport extends AlignmentViewport<AlignmentPanel>
         implements SelectionSource
 {
   public final static int NO_SPLIT = 0;
@@ -528,7 +528,6 @@ public class AlignViewport extends AlignmentViewport
                     new HiddenColumns(getAlignment().getHiddenColumns()),
                     this);
   }
-
   
   public boolean getSortByTree()
   {
@@ -539,19 +538,7 @@ public class AlignViewport extends AlignmentViewport
   {
     sortByTree = sort;
   }
-  /**
-   * return the alignPanel containing the given viewport. Use this to get the
-   * components currently handling the given viewport.
-   * 
-   * @param av
-   * @return null or an alignPanel guaranteed to have non-null alignFrame
-   *         reference
-   */
-  
-  public AlignmentPanel getAlignPanel()
-  {
-    return (AlignmentPanel) alignPanel;
-  }
+
   /**
    * Returns the (Desktop) instance of the StructureSelectionManager
    */
diff --git a/src/jalview/viewmodel/AlignmentViewport.java b/src/jalview/viewmodel/AlignmentViewport.java
index 2b4074e..bdf5327 100644
--- a/src/jalview/viewmodel/AlignmentViewport.java
+++ b/src/jalview/viewmodel/AlignmentViewport.java
@@ -84,8 +84,10 @@ import java.util.concurrent.ScheduledThreadPoolExecutor;
  * 
  * @author jimp
  * 
+ * @param <AlignmentPanelT>
+ *          implementation of the AlignmentViewPanel used by the class
  */
-public abstract class AlignmentViewport
+public abstract class AlignmentViewport<AlignmentPanelT extends AlignmentViewPanel>
         implements AlignViewportI, CommandListener, VamsasSource
 {
   public static final String PROPERTY_ALIGNMENT = "alignment";
@@ -138,24 +140,26 @@ public abstract class AlignmentViewport
     ranges = new ViewportRanges(al);
   }
 
-  protected AlignmentViewPanel alignPanel=null;
-  public void setAlignPanel(AlignmentViewPanel ap)
+  protected AlignmentPanelT alignPanel = null;
+
+  public void setAlignPanel(AlignmentPanelT ap)
   {
     alignPanel = ap;
   }
+
   /**
-   * return the AlignmentViewPanel containing the given viewport. Use this to get the
-   * components currently handling the given viewport.
+   * return the AlignmentViewPanel containing the given viewport. Use this to
+   * get the components currently handling the given viewport.
    * 
    * @param av
    * @return null or an alignPanel guaranteed to have non-null alignFrame
    *         reference
    */
-  
-  public AlignmentViewPanel getAlignPanel()
+  public AlignmentPanelT getAlignPanel()
   {
     return alignPanel;
   }
+
   /**
    * @param name
    * @see jalview.api.ViewStyleI#setFontName(java.lang.String)
-- 
1.7.10.2