#20 - Add AnnotationUsage#toAnnotation

Author: sebersole

src/main/java/org/hibernate/models/internal/AnnotationProxy.java

@@ -0,0 +1,50 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright: Red Hat Inc. and Hibernate Authors
+ */
+
+package org.hibernate.models.internal;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+import java.util.Map;
+
+import org.hibernate.models.spi.AnnotationDescriptor;
+import org.hibernate.models.spi.AttributeDescriptor;
+
+/**
+ * @author Steve Ebersole
+ */
+public class AnnotationProxy<A extends Annotation> implements InvocationHandler {
+	private final AnnotationDescriptor<A> annotationDescriptor;
+	private final Map<String,?> valueMap;
+
+	public AnnotationProxy(AnnotationDescriptor<A> annotationDescriptor, Map<String, ?> valueMap) {
+		this.annotationDescriptor = annotationDescriptor;
+		this.valueMap = valueMap;
+	}
+
+	@Override
+	public Object invoke(Object proxy, Method method, Object[] args) {
+		final AttributeDescriptor<Object> attributeDescriptor = annotationDescriptor.getAttribute( method.getName() );
+		return attributeDescriptor.getTypeDescriptor().unwrap( valueMap.get( method.getName() ) );
+	}
+
+
+	public static <A extends Annotation> A makeProxy(
+			AnnotationDescriptor<A> descriptor,
+			Map<String,?> valueMap) {
+		final AnnotationProxy<A> handler = new AnnotationProxy<>( descriptor, valueMap );
+		//noinspection unchecked
+		return (A) Proxy.newProxyInstance(
+				AnnotationProxy.class.getClassLoader(),
+				new Class<?>[] { descriptor.getAnnotationType() },
+				handler
+		);
+	}
+
+}

src/main/java/org/hibernate/models/internal/ArrayTypeDescriptor.java

@@ -120,4 +120,13 @@ public ValueWrapper<List<V>,Object[]> resolveJkWrapper(SourceModelBuildingContex
 		}
 		return jdkValueWrapper;
 	}
+
+	@Override
+	public Object unwrap(List<V> value) {
+		final Object[] result = new Object[value.size()];
+		for ( int i = 0; i < value.size(); i++ ) {
+			result[i] = elementTypeDescriptor.unwrap( value.get(i) );
+		}
+		return result;
+	}
 }

src/main/java/org/hibernate/models/internal/BooleanTypeDescriptor.java

@@ -54,4 +54,9 @@ public ValueExtractor<Annotation, Boolean> createJdkExtractor(SourceModelBuildin
 		//noinspection unchecked
 		return PassThruExtractor.PASS_THRU_EXTRACTOR;
 	}
+
+	@Override
+	public Object unwrap(Boolean value) {
+		return value;
+	}
 }

src/main/java/org/hibernate/models/internal/ByteTypeDescriptor.java

@@ -54,4 +54,9 @@ public ValueExtractor<Annotation, Byte> createJdkExtractor(SourceModelBuildingCo
 		//noinspection unchecked
 		return PassThruExtractor.PASS_THRU_EXTRACTOR;
 	}
+
+	@Override
+	public Object unwrap(Byte value) {
+		return value;
+	}
 }

src/main/java/org/hibernate/models/internal/CharacterTypeDescriptor.java

@@ -54,4 +54,9 @@ public ValueExtractor<Annotation, Character> createJdkExtractor(SourceModelBuild
 		//noinspection unchecked
 		return PassThruExtractor.PASS_THRU_EXTRACTOR;
 	}
+
+	@Override
+	public Object unwrap(Character value) {
+		return value;
+	}
 }

src/main/java/org/hibernate/models/internal/ClassTypeDescriptor.java

@@ -50,4 +50,9 @@ public ValueExtractor<AnnotationInstance, ClassDetails> createJandexExtractor(So
 	public ValueExtractor<Annotation, ClassDetails> createJdkExtractor(SourceModelBuildingContext buildingContext) {
 		return org.hibernate.models.internal.jdk.ClassValueExtractor.JDK_CLASS_EXTRACTOR;
 	}
+
+	@Override
+	public Object unwrap(ClassDetails value) {
+		return value.toJavaClass();
+	}
 }

src/main/java/org/hibernate/models/internal/DoubleTypeDescriptor.java

@@ -54,4 +54,9 @@ public ValueExtractor<Annotation, Double> createJdkExtractor(SourceModelBuilding
 		//noinspection unchecked
 		return PassThruExtractor.PASS_THRU_EXTRACTOR;
 	}
+
+	@Override
+	public Object unwrap(Double value) {
+		return value;
+	}
 }

src/main/java/org/hibernate/models/internal/EnumTypeDescriptor.java

@@ -63,4 +63,9 @@ public ValueExtractor<Annotation, E> createJdkExtractor(SourceModelBuildingConte
 		//noinspection unchecked
 		return PassThruExtractor.PASS_THRU_EXTRACTOR;
 	}
+
+	@Override
+	public Object unwrap(E value) {
+		return value;
+	}
 }

src/main/java/org/hibernate/models/internal/FloatTypeDescriptor.java

@@ -54,4 +54,9 @@ public ValueExtractor<Annotation, Float> createJdkExtractor(SourceModelBuildingC
 		//noinspection unchecked
 		return PassThruExtractor.PASS_THRU_EXTRACTOR;
 	}
+
+	@Override
+	public Object unwrap(Float value) {
+		return value;
+	}
 }

src/main/java/org/hibernate/models/internal/IntegerTypeDescriptor.java

@@ -54,4 +54,9 @@ public ValueExtractor<Annotation, Integer> createJdkExtractor(SourceModelBuildin
 		//noinspection unchecked
 		return PassThruExtractor.PASS_THRU_EXTRACTOR;
 	}
+
+	@Override
+	public Object unwrap(Integer value) {
+		return value;
+	}
 }