1 files changed, 77 insertions, 0 deletions
diff --git a/src/main/java/dev/isxander/yacl3/config/v3/CodecConfig.java b/src/main/java/dev/isxander/yacl3/config/v3/CodecConfig.java
new file mode 100644
index 0000000..833a7ef
--- /dev/null
+++ b/src/main/java/dev/isxander/yacl3/config/v3/CodecConfig.java
@@ -0,0 +1,77 @@
+package dev.isxander.yacl3.config.v3;
+
+import com.mojang.datafixers.util.Pair;
+import com.mojang.serialization.*;
+import org.jetbrains.annotations.ApiStatus;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@ApiStatus.Experimental
+public abstract class CodecConfig<S extends CodecConfig<S>> implements EntryAddable, Codec<S> {
+    private final List<ReadonlyConfigEntry<?>> entries = new ArrayList<>();
+
+    public CodecConfig() {
+        // cast here to throw immediately on construction
+        var ignored = (S) this;
+    }
+
+    @Override
+    public <T> ConfigEntry<T> register(String fieldName, T defaultValue, Codec<T> codec) {
+        ConfigEntry<T> entry = new CodecConfigEntryImpl<>(fieldName, defaultValue, codec);
+        entries.add(entry);
+        return entry;
+    }
+
+    @Override
+    public <T extends CodecConfig<T>> ReadonlyConfigEntry<T> register(String fieldName, T configInstance) {
+        ReadonlyConfigEntry<T> entry = new ChildConfigEntryImpl<>(fieldName, configInstance);
+        entries.add(entry);
+        return entry;
+    }
+
+    protected void onFinishedDecode(boolean successful) {
+    }
+
+    @Override
+    public <R> DataResult<R> encode(S input, DynamicOps<R> ops, R prefix) {
+        if (input != null && input != this) {
+            throw new IllegalArgumentException("`input` is ignored. It must be null or equal to `this`.");
+        }
+
+        return this.encode(ops, prefix);
+    }
+
+    @Override
+    public <R> DataResult<Pair<S, R>> decode(DynamicOps<R> ops, R input) {
+        this.decode(input, ops);
+        return DataResult.success(Pair.of((S) this, input));
+    }
+
+    public final <R> DataResult<R> encode(DynamicOps<R> ops, R prefix) {
+        RecordBuilder<R> builder = ops.mapBuilder();
+        for (ReadonlyConfigEntry<?> entry : entries) {
+            builder = entry.encode(ops, builder);
+        }
+        return builder.build(prefix);
+    }
+
+    public final <R> DataResult<R> encodeStart(DynamicOps<R> ops) {
+        return this.encode(ops, ops.empty());
+    }
+
+    /**
+     * @return true if decoding of all entries was successful
+     */
+    public final <R> boolean decode(R encoded, DynamicOps<R> ops) {
+        boolean success = true;
+
+        for (ReadonlyConfigEntry<?> entry : entries) {
+            success &= entry.decode(encoded, ops);
+        }
+
+        onFinishedDecode(success);
+
+        return success;
+    }
+}