Add methods th the plugin API to access type and inheritance information (#1491)

src/main/java/io/ebean/plugin/BeanType.java

@@ -9,6 +9,10 @@ import io.ebean.event.BeanQueryAdapter;
 import io.ebeanservice.docstore.api.mapping.DocumentMapping;
 
 import java.util.Collection;
+import java.util.List;
+import java.util.function.Consumer;
+
+import javax.annotation.Nonnull;
 
 /**
  * Information and methods on BeanDescriptors made available to plugins.
@@ -18,6 +22,7 @@ public interface BeanType<T> {
   /**
    * Return the short name of the bean type.
    */
+  @Nonnull
   String getName();
 
   /**
@@ -28,11 +33,13 @@ public interface BeanType<T> {
   /**
    * Return the full name of the bean type.
    */
+  @Nonnull
   String getFullName();
 
   /**
    * Return the class type this BeanDescriptor describes.
    */
+  @Nonnull
   Class<T> getBeanType();
 
   /**
@@ -43,6 +50,7 @@ public interface BeanType<T> {
   /**
    * Return all the properties for this bean type.
    */
+  @Nonnull
   Collection<? extends Property> allProperties();
 
   /**
@@ -197,6 +205,28 @@ public interface BeanType<T> {
    */
   boolean hasInheritance();
 
+  /**
+   * Return true if this object is the root level object in its entity
+   * inheritance.
+   */
+  boolean isInheritanceRoot();
+
+  /**
+   * Returns all direct children of this beantype
+   */
+  List<BeanType<?>> getInheritanceChildren();
+
+  /**
+   * Returns the parent in inheritance hiearchy
+   */
+  BeanType<?> getInheritanceParent();
+
+  /**
+   * Visit all children recursively
+   * @param visitor
+   */
+  void visitAllInheritanceChildren(Consumer<BeanType<?>> visitor);
+
   /**
    * Return the discriminator column.
    */

src/main/java/io/ebean/plugin/Property.java

@@ -1,5 +1,7 @@
 package io.ebean.plugin;
 
+import javax.annotation.Nonnull;
+
 /**
  * Property of a entity bean that can be read.
  */
@@ -8,8 +10,15 @@ public interface Property {
   /**
    * Return the name of the property.
    */
+  @Nonnull
   String getName();
 
+  /**
+   * Return the type of the property.
+   */
+  @Nonnull
+  Class<?> getPropertyType();
+
   /**
    * Return the value of the property on the given bean.
    */

src/main/java/io/ebeaninternal/server/deploy/BeanDescriptor.java

@@ -100,6 +100,7 @@ import java.sql.SQLException;
 import java.sql.Types;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.LinkedHashMap;
@@ -107,6 +108,8 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
 
 /**
  * Describes Beans including their deployment information.
@@ -1133,6 +1136,7 @@ public class BeanDescriptor<T> implements BeanType<T>, STreeType {
    * Return true if this object is the root level object in its entity
    * inheritance.
    */
+  @Override
   public boolean isInheritanceRoot() {
     return inheritInfo == null || inheritInfo.isRoot();
   }
@@ -3475,4 +3479,29 @@ public class BeanDescriptor<T> implements BeanType<T>, STreeType {
   public List<BeanProperty[]> getUniqueProps() {
     return propertiesUnique;
   }
+
+  @Override
+  public List<BeanType<?>> getInheritanceChildren() {
+    if (hasInheritance()) {
+      return getInheritInfo().getChildren()
+        .stream()
+        .map(InheritInfo::desc)
+        .collect(Collectors.toList());
+    } else {
+      return Collections.emptyList();
+    }
+  }
+
+  @Override
+  public BeanType<?> getInheritanceParent() {
+    return getInheritInfo() == null ? null : getInheritInfo().getParent().desc();
+  }
+
+  @Override
+  public void visitAllInheritanceChildren(Consumer<BeanType<?>> visitor) {
+    if (hasInheritance()) {
+      getInheritInfo().visitChildren(info -> visitor.accept(info.desc()));
+    }
+  }
+
 }

src/main/java/io/ebeaninternal/server/deploy/BeanProperty.java

@@ -979,6 +979,7 @@ public class BeanProperty implements ElPropertyValue, Property, STreeProperty {
   /**
    * Return the full name of this property.
    */
+  @Override
   public String getFullBeanName() {
     return descriptor.getFullName() + "." + name;
   }
@@ -994,6 +995,7 @@ public class BeanProperty implements ElPropertyValue, Property, STreeProperty {
   /**
    * Return the scalarType.
    */
+  @Override
   @SuppressWarnings(value = "unchecked")
   public ScalarType<Object> getScalarType() {
     return scalarType;
@@ -1369,6 +1371,7 @@ public class BeanProperty implements ElPropertyValue, Property, STreeProperty {
   /**
    * Return the property type.
    */
+  @Override
   public Class<?> getPropertyType() {
     return propertyType;
   }