neilcsmith-net commented on a change in pull request #3414:
URL: https://github.com/apache/netbeans/pull/3414#discussion_r784951868



##########
File path: 
java/java.lsp.server/nbcode/integration/src/org/netbeans/modules/nbcode/integration/UIDefaultsIconMetadata.java
##########
@@ -0,0 +1,357 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * 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
+ *
+ *   http://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.netbeans.modules.nbcode.integration;
+
+import java.awt.Component;
+import java.awt.EventQueue;
+import java.awt.Graphics;
+import java.awt.HeadlessException;
+import java.awt.Image;
+import java.awt.MediaTracker;
+import java.awt.Toolkit;
+import java.awt.Transparency;
+import java.awt.image.BufferedImage;
+import java.awt.image.ColorModel;
+import java.awt.image.ImageObserver;
+import java.awt.image.WritableRaster;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.util.Enumeration;
+import java.util.Hashtable;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import javax.swing.Icon;
+import javax.swing.ImageIcon;
+import javax.swing.UIDefaults;
+import javax.swing.UIDefaults.ActiveValue;
+import javax.swing.UIDefaults.LazyValue;
+import javax.swing.UIManager;
+import org.openide.modules.OnStart;
+import org.openide.util.ImageUtilities;
+
+/**
+ * Goes through UIDefaults and replaces Icons and Images with variants that
+ * return image's URL from the 'url' property.
+ * @author sdedic
+ */
+@OnStart
+public class UIDefaultsIconMetadata implements Runnable {
+    private static final Logger LOG = 
Logger.getLogger(UIDefaultsIconMetadata.class.getName());
+    
+    // for diagnostic purposes only
+    public static final String PROP_ORIGINAL_ICON = "originalIcon"; // NOI18N
+    // for diagnostic purposes only
+    public static final String PROP_ORIGINAL_IMAGE = "originalImage"; // NOI18N
+    
+    private static final String URN_DEFAULTS_PREFIX = "uidefaults:"; // NOI18N
+    
+    private static Object wrapImage(String key, Image image, Icon icon, 
Object... meta) {
+        Object o = image.getProperty(ImageUtilities.PROPERTY_ID, null); // 
NOI18N
+        if (o instanceof URL) {
+            return image;
+        }
+        
+        o = image.getProperty(ImageUtilities.PROPERTY_ID, null);
+        if (o instanceof String || o instanceof URI) {
+            return image;
+        } else {
+            
+            Hashtable props = new Hashtable();
+            for (int i = 0; i < meta.length; i+= 2) {
+                props.put(meta[i], meta[i+1]);
+            }
+            props.put(ImageUtilities.PROPERTY_ID, URN_DEFAULTS_PREFIX + key);
+            return createNew(image, icon, props);
+        }
+    }
+    
+    @Override
+    public void run() {
+        EventQueue.invokeLater(() -> {
+            replaceIconsAndImages(UIManager.getDefaults());
+        });
+    }
+    
+    static void replaceIconsAndImages(UIDefaults defs) {

Review comment:
       > Oh, I always assumed that this PR was part of the effort to let icons 
be branded for LAF purposes. Is there any hope of satisfying both needs with 
one API change?
   
   @eirikbakke I think so, but not necessarily with this PR.  And the question 
of keeping the metadata in the icon I can understand given the Swing internals 
at play too.  API discussions are probably better on dev@
   
   > That sounds a bit backwards. "Metadata" here just means "logical icon ID", 
right? And surely it's the site that actually loads the icon that should 
provide the logical icon ID to look up by?
   
   I agree with that.  IMO we need an API whereby icon loading can use a 
logical ID and request an icon for X.  And an SPI that provides the icons for 
X.  In the LSP _client_ you'd implement the same. Any such API/SPI could use 
the existing URLs (file locations) as a backup ID to aid transition.  So both 
needs would benefit from migrating to a logical ID, as well as being able to 
query that ID, without any icon being loaded.
   




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