test(java-oracle): measure the getter defaults XMLEncoder refers to

XMLEncoder shares equal Integer objects, so a node's x coordinate can be written as a reference to the result of JSidebarButton.getIconTextGap(). GetterDefaults constructs the classes like XMLDecoder does and records what the getters return (packages/fls/src/javaDefaults.json). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-29 20:13:28 +00:00
parent 0c843dc3de
commit fc9d865820
4 changed files with 107 additions and 1 deletions
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+// Measures the value a JavaBean getter returns on a freshly constructed object.
+// XMLEncoder shares equal Integer and Boolean objects: an int written once as
+// the result of a getter (`<void id="Integer0" property="iconTextGap"/>`) is
+// later referenced by id — e.g. as a node's x coordinate. Decoding such a file
+// needs these defaults; they are measured here, not guessed.
+//
+// Usage: java -cp filius.jar:lib/*:classes GetterDefaults <output json> <fqcn#property>...
+
+import java.beans.Introspector;
+import java.beans.PropertyDescriptor;
+import java.io.FileOutputStream;
+import java.lang.reflect.Method;
+import java.nio.charset.StandardCharsets;
+import java.util.Map;
+import java.util.TreeMap;
+
+public class GetterDefaults {
+
+    public static void main(String[] args) throws Exception {
+        Map<String, Object> result = new TreeMap<>();
+        for (int index = 1; index < args.length; index++) {
+            String key = args[index];
+            String className = key.substring(0, key.indexOf('#'));
+            String property = key.substring(key.indexOf('#') + 1);
+            String simpleName = className.substring(className.lastIndexOf('.') + 1);
+            try {
+                Object value = className.equals("java.lang.ThreadGroup")
+                        // A Thread's uncaughtExceptionHandler is its group; XMLDecoder runs
+                        // in the main thread, so that is the group asked.
+                        ? read(Thread.currentThread().getThreadGroup(), property)
+                        : read(Class.forName(className).getDeclaredConstructor().newInstance(), property);
+                result.put(simpleName + "#" + property, value);
+            } catch (Throwable error) {
+                Throwable cause = error.getCause() != null ? error.getCause() : error;
+                result.put(simpleName + "#" + property, Map.of("error", cause.toString()));
+            }
+        }
+        try (FileOutputStream out = new FileOutputStream(args[0])) {
+            out.write((FlsOracle.Json.write(result, "") + "\n").getBytes(StandardCharsets.UTF_8));
+        }
+        System.out.println("getter defaults: " + result.size());
+        System.exit(0);
+    }
+
+    static Object read(Object target, String property) throws Exception {
+        Method getter = null;
+        for (PropertyDescriptor descriptor : Introspector.getBeanInfo(target.getClass()).getPropertyDescriptors()) {
+            if (descriptor.getName().equals(property)) getter = descriptor.getReadMethod();
+        }
+        if (getter == null) getter = target.getClass().getMethod(property);
+        Object value = getter.invoke(target);
+        if (value == null || value instanceof Number || value instanceof Boolean || value instanceof String) return value;
+        return Map.of("class", value.getClass().getName());
+    }
+}