DATACMNS-457 - MappingContext now provides information about managed types.

Added MappingContext.getManagedTypes() as well as ….hasPersistentEntity(Class) to access all types currently managed by the MappingContext and find out whether a type is managed by the context.

src/main/java/org/springframework/data/mapping/context/AbstractMappingContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2012 by the original author(s).
+ * Copyright 2011-2014 by the original author(s).
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -59,7 +59,7 @@ import org.springframework.util.ReflectionUtils.FieldFilter;
  * 
  * @param E the concrete {@link PersistentEntity} type the {@link MappingContext} implementation creates
  * @param P the concrete {@link PersistentProperty} type the {@link MappingContext} implementation creates
- * @author Jon Brisbin <jbrisbin@vmware.com>
+ * @author Jon Brisbin
  * @author Oliver Gierke
  */
 public abstract class AbstractMappingContext<E extends MutablePersistentEntity<?, P>, P extends PersistentProperty<P>>
@@ -139,6 +139,15 @@ public abstract class AbstractMappingContext<E extends MutablePersistentEntity<?
 		return getPersistentEntity(ClassTypeInformation.from(type));
 	}
 
+	/* 
+	 * (non-Javadoc)
+	 * @see org.springframework.data.mapping.context.MappingContext#hasPersistentEntityFor(java.lang.Class)
+	 */
+	@Override
+	public boolean hasPersistentEntityFor(Class<?> type) {
+		return type == null ? false : persistentEntities.containsKey(ClassTypeInformation.from(type));
+	}
+
 	/*
 	 * (non-Javadoc)
 	 * @see org.springframework.data.mapping.model.MappingContext#getPersistentEntity(org.springframework.data.util.TypeInformation)
@@ -303,6 +312,23 @@ public abstract class AbstractMappingContext<E extends MutablePersistentEntity<?
 		}
 	}
 
+	/* 
+	 * (non-Javadoc)
+	 * @see org.springframework.data.mapping.context.PersistentEntityAware#getManagedTypes()
+	 */
+	@Override
+	public Collection<TypeInformation<?>> getManagedTypes() {
+
+		try {
+
+			read.lock();
+			return Collections.unmodifiableSet(new HashSet<TypeInformation<?>>(persistentEntities.keySet()));
+
+		} finally {
+			read.unlock();
+		}
+	}
+
 	/**
 	 * Creates the concrete {@link PersistentEntity} instance.
 	 * 

src/main/java/org/springframework/data/mapping/context/MappingContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2013 the original author or authors.
+ * Copyright 2011-2014 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -50,6 +50,15 @@ public interface MappingContext<E extends PersistentEntity<?, P>, P extends Pers
 	 */
 	E getPersistentEntity(Class<?> type);
 
+	/**
+	 * Returns whether the {@link MappingContext} currently contains a {@link PersistentEntity} for the type.
+	 * 
+	 * @param type can be {@literal null}.
+	 * @return
+	 * @since 1.8
+	 */
+	boolean hasPersistentEntityFor(Class<?> type);
+
 	/**
 	 * Returns a {@link PersistentEntity} for the given {@link TypeInformation}. Will return {@literal null} for types
 	 * that are considered simple ones.
@@ -87,4 +96,12 @@ public interface MappingContext<E extends PersistentEntity<?, P>, P extends Pers
 	 * @return the {@link PersistentPropertyPath} representing the given property path on the given type.
 	 */
 	PersistentPropertyPath<P> getPersistentPropertyPath(String propertyPath, Class<?> type);
+
+	/**
+	 * Returns the {@link TypeInformation}s for all {@link PersistentEntity}s in the {@link MappingContext}.
+	 * 
+	 * @return all {@link TypeInformation}s for the {@link PersistentEntity}s in the {@link MappingContext}.
+	 * @since 1.8
+	 */
+	Collection<TypeInformation<?>> getManagedTypes();
 }