Add JavaTimeFeature as placeholder

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java_version: ['8', '11', '17', '18']
+        java_version: ['8', '11', '17', '21']
         os: ['ubuntu-20.04']
     env:
       JAVA_OPTS: "-XX:+TieredCompilation -XX:TieredStopAtLevel=1"

datetime/src/main/java/com/fasterxml/jackson/datatype/jsr310/JavaTimeFeature.java

@@ -0,0 +1,37 @@
+package com.fasterxml.jackson.datatype.jsr310;
+
+import com.fasterxml.jackson.core.util.JacksonFeature;
+
+/**
+ * Configurable on/off features for Java 8 Date/Time module ({@link JavaTimeModule}).
+ *
+ * @since 2.16
+ */
+public enum JavaTimeFeature implements JacksonFeature
+{
+    /**
+     * Placeholder
+     */
+    BOGUS(false);
+
+    /**
+     * Whether feature is enabled or disabled by default.
+     */
+    private final boolean _defaultState;
+
+    private final int _mask;
+
+    JavaTimeFeature(boolean enabledByDefault) {
+        _defaultState = enabledByDefault;
+        _mask = (1 << ordinal());
+    }
+
+    @Override
+    public boolean enabledByDefault() { return _defaultState; }
+
+    @Override
+    public boolean enabledIn(int flags) { return (flags & _mask) != 0; }
+
+    @Override
+    public int getMask() { return _mask; }
+}

datetime/src/main/java/com/fasterxml/jackson/datatype/jsr310/JavaTimeModule.java

@@ -18,6 +18,7 @@
 
 import java.time.*;
 
+import com.fasterxml.jackson.core.util.JacksonFeatureSet;
 import com.fasterxml.jackson.databind.BeanDescription;
 import com.fasterxml.jackson.databind.DeserializationConfig;
 import com.fasterxml.jackson.databind.JavaType;
@@ -109,10 +110,17 @@ public final class JavaTimeModule extends SimpleModule
 {
     private static final long serialVersionUID = 1L;
 
+    /**
+     * @since 2.16
+     */
+    private JacksonFeatureSet<JavaTimeFeature> _features;
+
     public JavaTimeModule()
     {
         super(PackageVersion.VERSION);
 
+        _features = JacksonFeatureSet.fromDefaults(JavaTimeFeature.values());
+
         // First deserializers
 
         // // Instant variants:
@@ -178,6 +186,16 @@ public JavaTimeModule()
         addKeyDeserializer(ZoneOffset.class, ZoneOffsetKeyDeserializer.INSTANCE);
     }
 
+    public JavaTimeModule enable(JavaTimeFeature f) {
+        _features = _features.with(f);
+        return this;
+    }
+
+    public JavaTimeModule disable(JavaTimeFeature f) {
+        _features = _features.without(f);
+        return this;
+    }
+
     @Override
     public void setupModule(SetupContext context) {
         super.setupModule(context);