#1297 - ENH: Add DtoQuery ... such that we can map native SQL queries automatically into "DTO beans"

src/main/java/io/ebeaninternal/server/dto/DtoMetaProperty.java

@@ -0,0 +1,68 @@
+package io.ebeaninternal.server.dto;
+
+import io.ebeaninternal.server.type.DataReader;
+import io.ebeaninternal.server.type.ScalarType;
+import io.ebeaninternal.server.type.TypeManager;
+
+import java.beans.PropertyDescriptor;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import java.lang.reflect.Method;
+import java.sql.SQLException;
+
+class DtoMetaProperty implements DtoReadSet {
+
+  private final Class<?> dtoType;
+  private final String name;
+  private final MethodHandle setter;
+  private final ScalarType<?> scalarType;
+
+  DtoMetaProperty(TypeManager typeManager, PropertyDescriptor descriptor, Class<?> dtoType) throws IllegalAccessException, NoSuchMethodException {
+
+    this.dtoType = dtoType;
+    this.name = descriptor.getName();
+
+    Method writeMethod = descriptor.getWriteMethod();
+    if (writeMethod != null) {
+
+      Class<?> propertyType = descriptor.getPropertyType();
+
+      MethodHandles.Lookup lookup = MethodHandles.publicLookup();
+      this.setter = lookup.findVirtual(dtoType, writeMethod.getName(), MethodType.methodType(void.class, propertyType));
+      this.scalarType = typeManager.getScalarType(propertyType);
+
+    } else {
+      this.scalarType = null;
+      this.setter = null;
+    }
+  }
+
+  String getName() {
+    return name;
+  }
+
+  @Override
+  public boolean isReadOnly() {
+    return scalarType == null;
+  }
+
+  @Override
+  public void readSet(Object bean, DataReader dataReader) throws SQLException {
+    Object value = scalarType.read(dataReader);
+    invoke(bean, value);
+  }
+
+  private void invoke(Object instance, Object arg) {
+    try {
+      setter.invoke(instance, arg);
+    } catch (Throwable e) {
+      throw new RuntimeException("Error calling setter for property " + fullname() + " with arg: " + arg, e);
+    }
+  }
+
+  private String fullname() {
+    return dtoType.getName() + "." + name;
+  }
+
+}