feat(core, serde-ext, weaver-pojo)!: Introduce string map weaving, extend addressable entry API

CHANGELOG.md

@@ -5,6 +5,15 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Added
+
+- **Breaking**@`core`: Added `getEntry` method to `AddressableStructuredConfigEntry`
+  that allows to get a subentry by its data key.
+- `serde-extension`: Introduce a more generic `ReaderWriter` for `MutableStructuredConfigEntry`s.
+- `weaver-pojo`: Make maps with string keys into their own weavable entry type.
+
 ## [0.8.1] - 2026-04-26
 
 ### Fixed

tweed5/core/src/main/java/de/siphalor/tweed5/core/api/entry/AddressableStructuredConfigEntry.java

@@ -1,5 +1,7 @@
 package de.siphalor.tweed5.core.api.entry;
 
+import org.jspecify.annotations.Nullable;
+
 import java.util.function.Consumer;
 
 public interface AddressableStructuredConfigEntry<T> extends StructuredConfigEntry<T> {
@@ -9,5 +11,7 @@ public interface AddressableStructuredConfigEntry<T> extends StructuredConfigEnt
 		return this;
 	}
 
+	@Nullable ConfigEntry<?> getEntry(String dataKey);
+
 	Object get(T value, String dataKey);
 }

tweed5/core/src/main/java/de/siphalor/tweed5/core/api/entry/CompoundConfigEntry.java

@@ -11,6 +11,11 @@ public interface CompoundConfigEntry<T> extends MutableStructuredConfigEntry<T>
 		return this;
 	}
 
+	@Override
+	default ConfigEntry<?> getEntry(String dataKey) {
+		return subEntries().get(dataKey);
+	}
+
 	@Override
 	default void visitInOrder(ConfigEntryVisitor visitor) {
 		if (visitor.enterStructuredEntry(this)) {

tweed5/core/src/main/java/de/siphalor/tweed5/core/api/entry/NullableConfigEntry.java

@@ -1,7 +1,7 @@
 package de.siphalor.tweed5.core.api.entry;
 
 import de.siphalor.tweed5.core.api.Arity;
-import org.jetbrains.annotations.Nullable;
+import org.jspecify.annotations.Nullable;
 
 import java.util.function.Consumer;
 
@@ -17,6 +17,11 @@ public interface NullableConfigEntry<T extends @Nullable Object> extends Address
 
 	ConfigEntry<T> nonNullEntry();
 
+	@Override
+	default @Nullable ConfigEntry<?> getEntry(String dataKey) {
+		return dataKey.equals(NON_NULL_KEY) ? nonNullEntry() : null;
+	}
+
 	@Override
 	default void visitInOrder(ConfigEntryVisitor visitor) {
 		if (visitor.enterStructuredEntry(this)) {

tweed5/serde-extension/src/main/java/de/siphalor/tweed5/serde/extension/api/readwrite/TweedEntryReaderWriters.java

@@ -3,6 +3,7 @@ package de.siphalor.tweed5.serde.extension.api.readwrite;
 import de.siphalor.tweed5.core.api.entry.CollectionConfigEntry;
 import de.siphalor.tweed5.core.api.entry.CompoundConfigEntry;
 import de.siphalor.tweed5.core.api.entry.ConfigEntry;
+import de.siphalor.tweed5.core.api.entry.MutableStructuredConfigEntry;
 import de.siphalor.tweed5.core.api.entry.NullableConfigEntry;
 import de.siphalor.tweed5.serde.extension.api.TweedEntryReader;
 import de.siphalor.tweed5.serde.extension.api.TweedEntryWriter;
@@ -79,6 +80,11 @@ public class TweedEntryReaderWriters {
 		return (TweedEntryReaderWriter<C, @NonNull CollectionConfigEntry<T, C>>) (TweedEntryReaderWriter<?, ?>) TweedEntryReaderWriterImpls.COLLECTION_READER_WRITER;
 	}
 
+	public static <T, E extends MutableStructuredConfigEntry<T>> TweedEntryReaderWriter<T, E> mutableStructuredReaderWriter() {
+		//noinspection unchecked
+		return (TweedEntryReaderWriter<T, E>) TweedEntryReaderWriterImpls.MUTABLE_STRUCTURED_READER_WRITER;
+	}
+
 	public static <T> TweedEntryReaderWriter<T, CompoundConfigEntry<T>> compoundReaderWriter() {
 		//noinspection unchecked
 		return (TweedEntryReaderWriter<T, @NonNull CompoundConfigEntry<T>>) (TweedEntryReaderWriter<?, ?>) TweedEntryReaderWriterImpls.COMPOUND_READER_WRITER;

tweed5/serde-extension/src/main/java/de/siphalor/tweed5/serde/extension/impl/TweedEntryReaderWriterImpls.java

@@ -32,7 +32,8 @@ public class TweedEntryReaderWriterImpls {
 
 	public static final TweedEntryReaderWriter<Object, NullableConfigEntry<Object>> NULLABLE_READER_WRITER = new NullableReaderWriter<>();
 	public static final TweedEntryReaderWriter<Collection<Object>, CollectionConfigEntry<Object, Collection<Object>>> COLLECTION_READER_WRITER = new CollectionReaderWriter<>();
-	public static final TweedEntryReaderWriter<Object, CompoundConfigEntry<Object>> COMPOUND_READER_WRITER = new CompoundReaderWriter<>();
+	public static final TweedEntryReaderWriter<Object, MutableStructuredConfigEntry<Object>> MUTABLE_STRUCTURED_READER_WRITER = new MutableStructuredReaderWriter<>();
+	public static final TweedEntryReaderWriter<Object, CompoundConfigEntry<Object>> COMPOUND_READER_WRITER = new MutableStructuredReaderWriter<>();
 
 	public static final TweedEntryReaderWriter<Object, ConfigEntry<Object>> NOOP_READER_WRITER = new NoopReaderWriter();
 
@@ -219,11 +220,15 @@ public class TweedEntryReaderWriterImpls {
 		}
 	}
 
-	public static class CompoundReaderWriter<T> implements TweedEntryReaderWriter<T, CompoundConfigEntry<T>> {
+	public static class MutableStructuredReaderWriter<T, E extends MutableStructuredConfigEntry<T>>
+			implements TweedEntryReaderWriter<T, E> {
 		@Override
-		public TweedReadResult<T> read(TweedDataReader reader, CompoundConfigEntry<T> entry, TweedReadContext context) {
+		public TweedReadResult<T> read(
+				TweedDataReader reader,
+				E entry,
+				TweedReadContext context
+		) {
 			return requireToken(reader, TweedDataToken::isMapStart, "Expected map start", context).andThen(_token -> {
-				Map<String, ConfigEntry<?>> compoundEntries = entry.subEntries();
 				T compoundValue = entry.instantiateValue();
 				List<TweedReadIssue> issues = new ArrayList<>();
 				while (true) {
@@ -235,7 +240,7 @@ public class TweedEntryReaderWriterImpls {
 							String key = token.readAsString();
 
 							//noinspection unchecked
-							ConfigEntry<Object> subEntry = (ConfigEntry<Object>) compoundEntries.get(key);
+							ConfigEntry<Object> subEntry = (ConfigEntry<Object>) entry.getEntry(key);
 							if (subEntry == null) {
 								TweedReadResult<Object> noopResult = NOOP_READER_WRITER.read(reader, null, context);
 								issues.addAll(Arrays.asList(noopResult.issues()));
@@ -277,7 +282,12 @@ public class TweedEntryReaderWriterImpls {
 		}
 
 		@Override
-		public void write(TweedDataVisitor writer, @Nullable T value, CompoundConfigEntry<T> entry, TweedWriteContext context) throws TweedEntryWriteException, TweedDataWriteException {
+		public void write(
+				TweedDataVisitor writer,
+				@Nullable T value,
+				E entry,
+				TweedWriteContext context
+		) throws TweedEntryWriteException, TweedDataWriteException {
 			requireNonNullWriteValue(value, context);
 
 			writer.visitMapStart();

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/api/annotation/DefaultWeavingExtensions.java

@@ -3,6 +3,7 @@ package de.siphalor.tweed5.weaver.pojo.api.annotation;
 import de.siphalor.tweed5.annotationinheritance.api.AnnotationInheritance;
 import de.siphalor.tweed5.weaver.pojo.api.weaving.CollectionPojoWeaver;
 import de.siphalor.tweed5.weaver.pojo.api.weaving.CompoundPojoWeaver;
+import de.siphalor.tweed5.weaver.pojo.api.weaving.StringMapPojoWeaver;
 import de.siphalor.tweed5.weaver.pojo.api.weaving.TrivialPojoWeaver;
 
 import java.lang.annotation.ElementType;
@@ -13,6 +14,7 @@ import java.lang.annotation.Target;
 @AnnotationInheritance(passOn = PojoWeavingExtension.class)
 @PojoWeavingExtension(CompoundPojoWeaver.class)
 @PojoWeavingExtension(CollectionPojoWeaver.class)
+@PojoWeavingExtension(StringMapPojoWeaver.class)
 @PojoWeavingExtension(TrivialPojoWeaver.class)
 @Retention(RetentionPolicy.RUNTIME)
 @Target({ElementType.TYPE, ElementType.ANNOTATION_TYPE})

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/api/annotation/StringMapWeaving.java

@@ -0,0 +1,14 @@
+package de.siphalor.tweed5.weaver.pojo.api.annotation;
+
+import de.siphalor.tweed5.weaver.pojo.api.entry.WeavableStringMapConfigEntry;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.TYPE, ElementType.TYPE_USE})
+public @interface StringMapWeaving {
+	Class<? extends WeavableStringMapConfigEntry> entryClass() default WeavableStringMapConfigEntry.class;
+}

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/api/entry/WeavableStringMapConfigEntry.java

@@ -0,0 +1,20 @@
+package de.siphalor.tweed5.weaver.pojo.api.entry;
+
+import de.siphalor.tweed5.construct.api.TweedConstructFactory;
+import de.siphalor.tweed5.core.api.container.ConfigContainer;
+import de.siphalor.tweed5.core.api.entry.ConfigEntry;
+import de.siphalor.tweed5.core.api.entry.MutableStructuredConfigEntry;
+
+import java.util.Map;
+import java.util.function.Supplier;
+
+public interface WeavableStringMapConfigEntry<V, M extends Map<String, V>> extends MutableStructuredConfigEntry<M> {
+	@SuppressWarnings("rawtypes")
+	TweedConstructFactory<WeavableStringMapConfigEntry> FACTORY =
+			TweedConstructFactory.builder(WeavableStringMapConfigEntry.class)
+					.typedArg(ConfigContainer.class)
+					.namedArg("mapClass", Class.class) // map class
+					.namedArg("mapConstructor", Supplier.class) // map constructor
+					.namedArg("valueEntry", ConfigEntry.class)
+					.build();
+}

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/api/weaving/CollectionPojoWeaver.java

@@ -9,8 +9,7 @@ import de.siphalor.tweed5.weaver.pojo.api.annotation.CollectionWeaving;
 import de.siphalor.tweed5.weaver.pojo.api.entry.WeavableCollectionConfigEntry;
 import de.siphalor.tweed5.weaver.pojo.impl.entry.CollectionConfigEntryImpl;
 import de.siphalor.tweed5.weaver.pojo.impl.weaving.PojoWeavingException;
-import de.siphalor.tweed5.weaver.pojo.impl.weaving.collection.CollectionWeavingConfig;
+import de.siphalor.tweed5.weaver.pojo.impl.weaving.config.CollectionWeavingConfig;
-import de.siphalor.tweed5.weaver.pojo.impl.weaving.collection.CollectionWeavingConfigImpl;
 import org.jspecify.annotations.Nullable;
 
 import java.lang.invoke.MethodHandle;
@@ -21,7 +20,7 @@ import java.util.*;
 import java.util.function.IntFunction;
 
 public class CollectionPojoWeaver implements TweedPojoWeavingExtension {
-	private static final CollectionWeavingConfig DEFAULT_WEAVING_CONFIG = CollectionWeavingConfigImpl.builder()
+	private static final CollectionWeavingConfig DEFAULT_WEAVING_CONFIG = CollectionWeavingConfig.builder()
 			.collectionEntryClass(CollectionConfigEntryImpl.class)
 			.build();
 
@@ -80,7 +79,7 @@ public class CollectionPojoWeaver implements TweedPojoWeavingExtension {
 			return parent;
 		}
 
-		return CollectionWeavingConfigImpl.withOverrides(parent, local);
+		return CollectionWeavingConfig.withOverrides(parent, local);
 	}
 
 	private @Nullable CollectionWeavingConfig createWeavingConfigFromAnnotations(AnnotatedElement annotations) {
@@ -89,7 +88,7 @@ public class CollectionPojoWeaver implements TweedPojoWeavingExtension {
 			return null;
 		}
 
-		CollectionWeavingConfigImpl.CollectionWeavingConfigImplBuilder builder = CollectionWeavingConfigImpl.builder();
+		CollectionWeavingConfig.CollectionWeavingConfigBuilder builder = CollectionWeavingConfig.builder();
 		if (annotation.entryClass() != null) {
 			builder.collectionEntryClass(annotation.entryClass());
 		}

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/api/weaving/CompoundPojoWeaver.java

@@ -15,8 +15,7 @@ import de.siphalor.tweed5.typeutils.api.type.TypeAnnotationLayer;
 import de.siphalor.tweed5.weaver.pojo.impl.entry.StaticPojoCompoundConfigEntry;
 import de.siphalor.tweed5.weaver.pojo.impl.weaving.PojoClassIntrospector;
 import de.siphalor.tweed5.weaver.pojo.impl.weaving.PojoWeavingException;
-import de.siphalor.tweed5.weaver.pojo.impl.weaving.compound.CompoundWeavingConfig;
+import de.siphalor.tweed5.weaver.pojo.impl.weaving.config.CompoundWeavingConfig;
-import de.siphalor.tweed5.weaver.pojo.impl.weaving.compound.CompoundWeavingConfigImpl;
 import org.jspecify.annotations.Nullable;
 
 import java.lang.invoke.MethodHandle;
@@ -30,7 +29,7 @@ import java.util.stream.Collectors;
  * A weaver that weaves classes with the {@link CompoundWeaving} annotation as compound entries.
  */
 public class CompoundPojoWeaver implements TweedPojoWeavingExtension {
-	private static final CompoundWeavingConfig DEFAULT_WEAVING_CONFIG = CompoundWeavingConfigImpl.builder()
+	private static final CompoundWeavingConfig DEFAULT_WEAVING_CONFIG = CompoundWeavingConfig.builder()
 			.compoundSourceNamingFormat(NamingFormats.camelCase())
 			.compoundTargetNamingFormat(NamingFormats.camelCase())
 			.compoundEntryClass(StaticPojoCompoundConfigEntry.class)
@@ -84,7 +83,7 @@ public class CompoundPojoWeaver implements TweedPojoWeavingExtension {
 			return parent;
 		}
 
-		return CompoundWeavingConfigImpl.withOverrides(parent, local);
+		return CompoundWeavingConfig.withOverrides(parent, local);
 	}
 
 	private @Nullable CompoundWeavingConfig createWeavingConfigFromAnnotations(AnnotatedElement annotations) {
@@ -93,7 +92,7 @@ public class CompoundPojoWeaver implements TweedPojoWeavingExtension {
 			return null;
 		}
 
-		CompoundWeavingConfigImpl.CompoundWeavingConfigImplBuilder builder = CompoundWeavingConfigImpl.builder();
+		CompoundWeavingConfig.CompoundWeavingConfigBuilder builder = CompoundWeavingConfig.builder();
 		builder.compoundSourceNamingFormat(NamingFormats.camelCase());
 		if (!annotation.namingFormat().isEmpty()) {
 			builder.compoundTargetNamingFormat(getNamingFormatById(annotation.namingFormat()));

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/api/weaving/StringMapPojoWeaver.java

@@ -0,0 +1,135 @@
+package de.siphalor.tweed5.weaver.pojo.api.weaving;
+
+import de.siphalor.tweed5.core.api.container.ConfigContainer;
+import de.siphalor.tweed5.core.api.entry.ConfigEntry;
+import de.siphalor.tweed5.patchwork.api.Patchwork;
+import de.siphalor.tweed5.patchwork.api.PatchworkPartAccess;
+import de.siphalor.tweed5.typeutils.api.type.ActualType;
+import de.siphalor.tweed5.weaver.pojo.api.annotation.StringMapWeaving;
+import de.siphalor.tweed5.weaver.pojo.api.entry.WeavableStringMapConfigEntry;
+import de.siphalor.tweed5.weaver.pojo.impl.entry.StringMapConfigEntryImpl;
+import de.siphalor.tweed5.weaver.pojo.impl.weaving.PojoWeavingException;
+import de.siphalor.tweed5.weaver.pojo.impl.weaving.config.StringMapWeavingConfig;
+import org.jspecify.annotations.Nullable;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import java.lang.reflect.AnnotatedElement;
+import java.util.*;
+import java.util.function.Supplier;
+
+/**
+ * A weaver that weaves classes with the {@link StringMapWeaving} annotation as string map entries.
+ * The type must be a {@link Map} with {@link String} keys.
+ */
+public class StringMapPojoWeaver implements TweedPojoWeavingExtension {
+	private static final StringMapWeavingConfig DEFAULT_WEAVING_CONFIG = StringMapWeavingConfig.builder()
+			.stringMapEntryClass(StringMapConfigEntryImpl.class)
+			.build();
+
+	@Nullable
+	private PatchworkPartAccess<StringMapWeavingConfig> weavingConfigAccess;
+
+	@Override
+	public void setup(SetupContext context) {
+		this.weavingConfigAccess = context.registerWeavingContextExtensionData(StringMapWeavingConfig.class);
+	}
+
+	@SuppressWarnings({"unchecked"})
+	@Override
+	public <T> @Nullable ConfigEntry<T> weaveEntry(ActualType<T> valueType, WeavingContext context) {
+		assert weavingConfigAccess != null;
+
+		List<ActualType<?>> mapTypeParams = valueType.getTypesOfSuperArguments(Map.class);
+		if (mapTypeParams == null || mapTypeParams.get(0).declaredType() != String.class) {
+			return null;
+		}
+
+		try {
+			StringMapWeavingConfig weavingConfig = getOrCreateWeavingConfig(context);
+			Patchwork newExtensionsData = context.extensionsData().copy();
+			newExtensionsData.set(weavingConfigAccess, weavingConfig);
+
+			ActualType<?> valueTypeParam = mapTypeParams.get(1);
+			Supplier<Map<String, Object>> constructor = getMapConstructor(valueType);
+
+			ConfigEntry<?> valueEntry = context.weaveEntry(
+					valueTypeParam,
+					newExtensionsData,
+					ProtoWeavingContext.subContextFor(context, "value", valueTypeParam)
+			);
+
+			return WeavableStringMapConfigEntry.FACTORY
+					.construct(Objects.requireNonNull(weavingConfig.stringMapEntryClass()))
+					.typedArg(ConfigContainer.class, context.configContainer())
+					.namedArg("mapClass", valueType.declaredType())
+					.namedArg("mapConstructor", constructor)
+					.namedArg("valueEntry", valueEntry)
+					.finish();
+		} catch (Exception e) {
+			throw new PojoWeavingException("Exception occurred trying to weave string map for class " + valueType, e);
+		}
+	}
+
+	private StringMapWeavingConfig getOrCreateWeavingConfig(WeavingContext context) {
+		assert weavingConfigAccess != null;
+
+		StringMapWeavingConfig parent = context.extensionsData().get(weavingConfigAccess);
+		if (parent == null) {
+			parent = DEFAULT_WEAVING_CONFIG;
+		}
+
+		StringMapWeavingConfig local = createWeavingConfigFromAnnotations(context.annotations());
+		if (local == null) {
+			return parent;
+		}
+
+		return StringMapWeavingConfig.withOverrides(parent, local);
+	}
+
+	private @Nullable StringMapWeavingConfig createWeavingConfigFromAnnotations(AnnotatedElement annotations) {
+		StringMapWeaving annotation = annotations.getAnnotation(StringMapWeaving.class);
+		if (annotation == null) {
+			return null;
+		}
+
+		StringMapWeavingConfig.StringMapWeavingConfigBuilder builder = StringMapWeavingConfig.builder();
+		if (annotation.entryClass() != WeavableStringMapConfigEntry.class) {
+			builder.stringMapEntryClass(annotation.entryClass());
+		}
+
+		return builder.build();
+	}
+
+	private Supplier<Map<String, Object>> getMapConstructor(ActualType<?> type) {
+		Class<?> declaredType = type.declaredType();
+		if (declaredType == Map.class || declaredType == HashMap.class) {
+			return HashMap::new;
+		} else if (declaredType == LinkedHashMap.class) {
+			return LinkedHashMap::new;
+		} else if (declaredType == TreeMap.class) {
+			return TreeMap::new;
+		}
+		try {
+			return findCompatibleConstructor(type);
+		} catch (NoSuchMethodException | IllegalAccessException e) {
+			throw new PojoWeavingException("Could not find no-args constructor for " + type, e);
+		}
+	}
+
+	@SuppressWarnings("unchecked")
+	private Supplier<Map<String, Object>> findCompatibleConstructor(ActualType<?> type) throws
+			NoSuchMethodException,
+			IllegalAccessException {
+		MethodHandles.Lookup lookup = MethodHandles.publicLookup();
+		MethodHandle constructor = lookup.findConstructor(type.declaredType(), MethodType.methodType(void.class));
+		return () -> {
+			try {
+				return (Map<String, Object>) constructor.invoke();
+			} catch (Throwable e) {
+				throw new RuntimeException(e);
+			}
+		};
+	}
+}

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/impl/entry/StringMapConfigEntryImpl.java

@@ -0,0 +1,100 @@
+package de.siphalor.tweed5.weaver.pojo.impl.entry;
+
+import de.siphalor.tweed5.construct.api.ConstructParameter;
+import de.siphalor.tweed5.core.api.Arity;
+import de.siphalor.tweed5.core.api.container.ConfigContainer;
+import de.siphalor.tweed5.core.api.entry.BaseConfigEntry;
+import de.siphalor.tweed5.core.api.entry.ConfigEntry;
+import de.siphalor.tweed5.core.api.entry.ConfigEntryValueVisitor;
+import de.siphalor.tweed5.core.api.entry.ConfigEntryVisitor;
+import de.siphalor.tweed5.core.api.entry.SubEntryKey;
+import de.siphalor.tweed5.weaver.pojo.api.entry.WeavableStringMapConfigEntry;
+import org.jspecify.annotations.Nullable;
+
+import java.util.Collections;
+import java.util.Map;
+import java.util.function.Supplier;
+
+public class StringMapConfigEntryImpl<V, M extends Map<String, V>>
+		extends BaseConfigEntry<M>
+		implements WeavableStringMapConfigEntry<V, M> {
+	private final Supplier<M> mapConstructor;
+	private final ConfigEntry<V> valueEntry;
+
+	public StringMapConfigEntryImpl(
+			ConfigContainer<?> container,
+			@ConstructParameter(name = "mapClass") Class<M> mapClass,
+			@ConstructParameter(name = "mapConstructor") Supplier<M> mapConstructor,
+			@ConstructParameter(name = "valueEntry") ConfigEntry<V> valueEntry
+	) {
+		super(container, mapClass);
+		this.mapConstructor = mapConstructor;
+		this.valueEntry = valueEntry;
+	}
+
+	@Override
+	public M instantiateValue() {
+		return mapConstructor.get();
+	}
+
+	@Override
+	public void set(M value, String dataKey, Object subValue) {
+		//noinspection unchecked
+		value.put(dataKey, (V) subValue);
+	}
+
+	@Override
+	public @Nullable ConfigEntry<?> getEntry(String dataKey) {
+		return valueEntry;
+	}
+
+	@Override
+	public Object get(M value, String dataKey) {
+		return value.get(dataKey);
+	}
+
+	@Override
+	public Map<String, ConfigEntry<?>> subEntries() {
+		return Collections.singletonMap(":value", valueEntry);
+	}
+
+	@Override
+	public void visitInOrder(ConfigEntryVisitor visitor) {
+		if (visitor.enterStructuredEntry(this)) {
+			if (visitor.enterStructuredSubEntry(":value", Arity.ANY)) {
+				valueEntry.visitInOrder(visitor);
+				visitor.leaveStructuredSubEntry(":value", Arity.ANY);
+			}
+			visitor.leaveStructuredEntry(this);
+		}
+	}
+
+	@Override
+	public void visitInOrder(ConfigEntryValueVisitor visitor, M value) {
+		if (value == null) {
+			return;
+		}
+		if (visitor.enterStructuredEntry(this, value)) {
+			for (Map.Entry<String, V> entry : value.entrySet()) {
+				SubEntryKey subEntryKey = SubEntryKey.addressable(":value", entry.getKey(), entry.getKey());
+				if (visitor.enterSubEntry(subEntryKey)) {
+					valueEntry.visitInOrder(visitor, entry.getValue());
+					visitor.leaveSubEntry(subEntryKey);
+				}
+			}
+			visitor.leaveStructuredEntry(this, value);
+		}
+	}
+
+	@Override
+	public M deepCopy(M value) {
+		if (value == null) {
+			return null;
+		}
+		M copy = mapConstructor.get();
+		for (Map.Entry<String, V> entry : value.entrySet()) {
+			copy.put(entry.getKey(), valueEntry.deepCopy(entry.getValue()));
+		}
+		return copy;
+	}
+}

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/impl/weaving/collection/CollectionWeavingConfig.java

@@ -1,9 +0,0 @@
-package de.siphalor.tweed5.weaver.pojo.impl.weaving.collection;
-
-import de.siphalor.tweed5.weaver.pojo.api.entry.WeavableCollectionConfigEntry;
-import org.jspecify.annotations.Nullable;
-
-public interface CollectionWeavingConfig {
-	@SuppressWarnings("rawtypes")
-	@Nullable Class<? extends WeavableCollectionConfigEntry> collectionEntryClass();
-}

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/impl/weaving/collection/package-info.java

@@ -1,4 +0,0 @@
-@NullMarked
-package de.siphalor.tweed5.weaver.pojo.impl.weaving.collection;
-
-import org.jspecify.annotations.NullMarked;

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/impl/weaving/compound/CompoundWeavingConfig.java

@@ -1,14 +0,0 @@
-package de.siphalor.tweed5.weaver.pojo.impl.weaving.compound;
-
-import de.siphalor.tweed5.namingformat.api.NamingFormat;
-import de.siphalor.tweed5.weaver.pojo.api.entry.WeavableCompoundConfigEntry;
-import org.jspecify.annotations.Nullable;
-
-public interface CompoundWeavingConfig {
-	@Nullable NamingFormat compoundSourceNamingFormat();
-
-	@Nullable NamingFormat compoundTargetNamingFormat();
-
-	@SuppressWarnings("rawtypes")
-	@Nullable Class<? extends WeavableCompoundConfigEntry> compoundEntryClass();
-}

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/impl/weaving/compound/package-info.java

@@ -1,4 +0,0 @@
-@NullMarked
-package de.siphalor.tweed5.weaver.pojo.impl.weaving.compound;
-
-import org.jspecify.annotations.NullMarked;

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/impl/weaving/config/CollectionWeavingConfig.java

@@ -1,4 +1,4 @@
-package de.siphalor.tweed5.weaver.pojo.impl.weaving.collection;
+package de.siphalor.tweed5.weaver.pojo.impl.weaving.config;
 
 import de.siphalor.tweed5.weaver.pojo.api.entry.WeavableCollectionConfigEntry;
 import lombok.Builder;
@@ -7,13 +7,13 @@ import org.jspecify.annotations.Nullable;
 
 @Builder
 @Value
-public class CollectionWeavingConfigImpl implements CollectionWeavingConfig {
+public class CollectionWeavingConfig {
 
 	@SuppressWarnings("rawtypes")
 	@Nullable Class<? extends WeavableCollectionConfigEntry> collectionEntryClass;
 
-	public static CollectionWeavingConfigImpl withOverrides(CollectionWeavingConfig self, CollectionWeavingConfig overrides) {
+	public static CollectionWeavingConfig withOverrides(CollectionWeavingConfig self, CollectionWeavingConfig overrides) {
-		return CollectionWeavingConfigImpl.builder()
+		return CollectionWeavingConfig.builder()
 				.collectionEntryClass(overrides.collectionEntryClass() != null ? overrides.collectionEntryClass() : self.collectionEntryClass())
 				.build();
 	}

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/impl/weaving/config/CompoundWeavingConfig.java

@@ -1,4 +1,4 @@
-package de.siphalor.tweed5.weaver.pojo.impl.weaving.compound;
+package de.siphalor.tweed5.weaver.pojo.impl.weaving.config;
 
 import de.siphalor.tweed5.namingformat.api.NamingFormat;
 import de.siphalor.tweed5.weaver.pojo.api.entry.WeavableCompoundConfigEntry;
@@ -8,15 +8,15 @@ import org.jspecify.annotations.Nullable;
 
 @Builder
 @Value
-public class CompoundWeavingConfigImpl implements CompoundWeavingConfig {
+public class CompoundWeavingConfig {
 
 	@Nullable NamingFormat compoundSourceNamingFormat;
 	@Nullable NamingFormat compoundTargetNamingFormat;
 	@SuppressWarnings("rawtypes")
 	@Nullable Class<? extends WeavableCompoundConfigEntry> compoundEntryClass;
 
-	public static CompoundWeavingConfigImpl withOverrides(CompoundWeavingConfig self, CompoundWeavingConfig overrides) {
+	public static CompoundWeavingConfig withOverrides(CompoundWeavingConfig self, CompoundWeavingConfig overrides) {
-		return CompoundWeavingConfigImpl.builder()
+		return CompoundWeavingConfig.builder()
 				.compoundSourceNamingFormat(overrides.compoundSourceNamingFormat() != null ? overrides.compoundSourceNamingFormat() : self.compoundSourceNamingFormat())
 				.compoundTargetNamingFormat(overrides.compoundTargetNamingFormat() != null ? overrides.compoundTargetNamingFormat() : self.compoundTargetNamingFormat())
 				.compoundEntryClass(overrides.compoundEntryClass() != null ? overrides.compoundEntryClass() : self.compoundEntryClass())

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/impl/weaving/config/StringMapWeavingConfig.java

@@ -0,0 +1,20 @@
+package de.siphalor.tweed5.weaver.pojo.impl.weaving.config;
+
+import de.siphalor.tweed5.weaver.pojo.api.entry.WeavableStringMapConfigEntry;
+import lombok.Builder;
+import lombok.Value;
+import org.jspecify.annotations.Nullable;
+
+@Builder
+@Value
+public class StringMapWeavingConfig {
+
+	@SuppressWarnings("rawtypes")
+	@Nullable Class<? extends WeavableStringMapConfigEntry> stringMapEntryClass;
+
+	public static StringMapWeavingConfig withOverrides(StringMapWeavingConfig self, StringMapWeavingConfig overrides) {
+		return StringMapWeavingConfig.builder()
+				.stringMapEntryClass(overrides.stringMapEntryClass() != null ? overrides.stringMapEntryClass() : self.stringMapEntryClass())
+				.build();
+	}
+}

tweed5/weaver-pojo/src/main/java/de/siphalor/tweed5/weaver/pojo/impl/weaving/config/package-info.java

@@ -0,0 +1,4 @@
+@NullMarked
+package de.siphalor.tweed5.weaver.pojo.impl.weaving.config;
+
+import org.jspecify.annotations.NullMarked;

tweed5/weaver-pojo/src/test/java/de/siphalor/tweed5/weaver/pojo/api/weaving/StringMapPojoWeaverTest.java

@@ -0,0 +1,170 @@
+package de.siphalor.tweed5.weaver.pojo.api.weaving;
+
+import de.siphalor.tweed5.core.api.container.ConfigContainer;
+import de.siphalor.tweed5.core.api.entry.ConfigEntry;
+import de.siphalor.tweed5.core.impl.entry.SimpleConfigEntryImpl;
+import de.siphalor.tweed5.patchwork.api.Patchwork;
+import de.siphalor.tweed5.patchwork.api.PatchworkFactory;
+import de.siphalor.tweed5.typeutils.api.type.ActualType;
+import de.siphalor.tweed5.weaver.pojo.api.annotation.StringMapWeaving;
+import org.jetbrains.annotations.Nullable;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static de.siphalor.tweed5.weaver.pojo.test.ConfigEntryAssertions.isSimpleEntryForClass;
+import static de.siphalor.tweed5.weaver.pojo.test.ConfigEntryAssertions.isStringMapEntryForClass;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+
+@SuppressWarnings("unused")
+class StringMapPojoWeaverTest {
+
+	private StringMapPojoWeaver stringMapWeaver;
+	private PatchworkFactory weavingContextExtensionDataFactory;
+
+	@BeforeEach
+	void setup() {
+		PatchworkFactory.Builder builder = PatchworkFactory.builder();
+		stringMapWeaver = new StringMapPojoWeaver();
+		stringMapWeaver.setup(builder::registerPart);
+		weavingContextExtensionDataFactory = builder.build();
+	}
+
+	private WeavingContext.WeavingFn createWeavingFn(AtomicReference<WeavingContext.@Nullable WeavingFn> ref) {
+		WeavingContext.WeavingFn fn = new WeavingContext.WeavingFn() {
+			@Override
+			public <T> ConfigEntry<T> weaveEntry(
+					ActualType<T> valueType,
+					Patchwork extensionsData,
+					ProtoWeavingContext protoContext
+			) {
+				WeavingContext context = WeavingContext.builder()
+						.configContainer(protoContext.configContainer())
+						.annotations(valueType)
+						.extensionsData(extensionsData.copy())
+						.path(protoContext.path())
+						.weavingFunction(Objects.requireNonNull(ref.get()))
+						.build();
+				return Objects.requireNonNullElseGet(
+						stringMapWeaver.weaveEntry(valueType, context),
+						() -> new SimpleConfigEntryImpl<>(context.configContainer(), valueType.declaredType())
+				);
+			}
+
+			@Override
+			public <T> ConfigEntry<T> weavePseudoEntry(
+					WeavingContext parentContext,
+					String pseudoEntryName,
+					Patchwork extensionsData
+			) {
+				assert false;
+				return null;
+			}
+		};
+		ref.set(fn);
+		return fn;
+	}
+
+	@Test
+	void weaveStringToIntegerMap() {
+		AtomicReference<WeavingContext.@Nullable WeavingFn> weavingFnRef = new AtomicReference<>();
+		WeavingContext.WeavingFn weavingFn = createWeavingFn(weavingFnRef);
+
+		WeavingContext weavingContext = WeavingContext.builder()
+				.weavingFunction(weavingFn)
+				.extensionsData(weavingContextExtensionDataFactory.create())
+				.annotations(StringToIntegerMap.class)
+				.path(new String[0])
+				.configContainer(mock(ConfigContainer.class))
+				.build();
+
+		ConfigEntry<StringToIntegerMap> resultEntry = stringMapWeaver.weaveEntry(
+				ActualType.ofClass(StringToIntegerMap.class),
+				weavingContext
+		);
+
+		assertThat(resultEntry).satisfies(isStringMapEntryForClass(StringToIntegerMap.class, mapEntry ->
+				assertThat(mapEntry.subEntries())
+						.hasEntrySatisfying(":value", isSimpleEntryForClass(Integer.class))
+						.hasSize(1)
+		));
+	}
+
+	@Test
+	void weaveStringToStringMap() {
+		AtomicReference<WeavingContext.@Nullable WeavingFn> weavingFnRef = new AtomicReference<>();
+		WeavingContext.WeavingFn weavingFn = createWeavingFn(weavingFnRef);
+
+		WeavingContext weavingContext = WeavingContext.builder()
+				.weavingFunction(weavingFn)
+				.extensionsData(weavingContextExtensionDataFactory.create())
+				.annotations(StringToStringLinkedMap.class)
+				.path(new String[0])
+				.configContainer(mock(ConfigContainer.class))
+				.build();
+
+		ConfigEntry<StringToStringLinkedMap> resultEntry = stringMapWeaver.weaveEntry(
+				ActualType.ofClass(StringToStringLinkedMap.class),
+				weavingContext
+		);
+
+		assertThat(resultEntry).satisfies(isStringMapEntryForClass(StringToStringLinkedMap.class, mapEntry ->
+				assertThat(mapEntry.subEntries())
+						.hasEntrySatisfying(":value", isSimpleEntryForClass(String.class))
+						.hasSize(1)
+		));
+	}
+
+	@Test
+	void returnsNullWithoutAnnotation() {
+		WeavingContext weavingContext = WeavingContext.builder()
+				.weavingFunction(mock(WeavingContext.WeavingFn.class))
+				.extensionsData(weavingContextExtensionDataFactory.create())
+				.annotations(UnannotatedStringMap.class)
+				.path(new String[0])
+				.configContainer(mock(ConfigContainer.class))
+				.build();
+
+		ConfigEntry<UnannotatedStringMap> resultEntry = stringMapWeaver.weaveEntry(
+				ActualType.ofClass(UnannotatedStringMap.class),
+				weavingContext
+		);
+
+		assertThat(resultEntry).isNull();
+	}
+
+	@Test
+	void returnsNullForNonStringKey() {
+		WeavingContext weavingContext = WeavingContext.builder()
+				.weavingFunction(mock(WeavingContext.WeavingFn.class))
+				.extensionsData(weavingContextExtensionDataFactory.create())
+				.annotations(IntegerKeyMap.class)
+				.path(new String[0])
+				.configContainer(mock(ConfigContainer.class))
+				.build();
+
+		ConfigEntry<IntegerKeyMap> resultEntry = stringMapWeaver.weaveEntry(
+				ActualType.ofClass(IntegerKeyMap.class),
+				weavingContext
+		);
+
+		assertThat(resultEntry).isNull();
+	}
+
+	@StringMapWeaving
+	public static class StringToIntegerMap extends HashMap<String, Integer> {}
+
+	@StringMapWeaving
+	public static class StringToStringLinkedMap extends LinkedHashMap<String, String> {}
+
+	public static class UnannotatedStringMap extends HashMap<String, Integer> {}
+
+	@StringMapWeaving
+	public static class IntegerKeyMap extends HashMap<Integer, String> {}
+}

tweed5/weaver-pojo/src/test/java/de/siphalor/tweed5/weaver/pojo/test/ConfigEntryAssertions.java

@@ -4,6 +4,7 @@ import de.siphalor.tweed5.core.api.entry.CollectionConfigEntry;
 import de.siphalor.tweed5.core.api.entry.CompoundConfigEntry;
 import de.siphalor.tweed5.core.api.entry.ConfigEntry;
 import de.siphalor.tweed5.core.api.entry.SimpleConfigEntry;
+import de.siphalor.tweed5.weaver.pojo.api.entry.WeavableStringMapConfigEntry;
 
 import java.util.function.Consumer;
 
@@ -35,6 +36,23 @@ public class ConfigEntryAssertions {
 				);
 	}
 
+	@SuppressWarnings("rawtypes")
+	public static Consumer<Object> isStringMapEntryForClass(
+			Class<?> mapClass,
+			Consumer<WeavableStringMapConfigEntry<?, ?>> condition
+	) {
+		return object -> assertThat(object)
+				.as("Should be a string map config entry for class " + mapClass.getName())
+				.asInstanceOf(type(WeavableStringMapConfigEntry.class))
+				.as("String map entry for class " + mapClass.getSimpleName())
+				.satisfies(
+						mapEntry -> assertThat(mapEntry.valueClass())
+								.as("Value class of string map entry should match")
+								.isEqualTo(mapClass),
+						condition::accept
+				);
+	}
+
 	public static Consumer<Object> isCollectionEntryForClass(
 			Class<?> collectionClass,
 			Consumer<CollectionConfigEntry<?, ?>> condition