From d1adb30aa372397976b0a56ac2eea4063757ba2a Mon Sep 17 00:00:00 2001
From: Andreas Stöckel <astoecke@techfak.uni-bielefeld.de>
Date: Thu, 16 Apr 2015 01:07:59 +0200
Subject: Added functions for reading attached data with a certain expected
 type

---
 src/core/managed/Managed.cpp | 14 ++++++++++++++
 src/core/managed/Managed.hpp | 42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+)

diff --git a/src/core/managed/Managed.cpp b/src/core/managed/Managed.cpp
index 64e287d..731947b 100644
--- a/src/core/managed/Managed.cpp
+++ b/src/core/managed/Managed.cpp
@@ -42,6 +42,20 @@ Rooted<Managed> Managed::readData(const std::string &key)
 	return mgr.readData(this, key);
 }
 
+Rooted<Managed> Managed::readData(const std::string &key, const Rtti *type)
+{
+	Rooted<Managed> res = mgr.readData(this, key);
+	if (res != nullptr && res->type()->isa(type)) {
+		return res;
+	}
+	return nullptr;
+}
+
+Managed* Managed::readDataPtr(const std::string &key, const std::type_info &type)
+{
+	return readData(key, RttiStore::lookup(type)).get();
+}
+
 std::map<std::string, Rooted<Managed>> Managed::readData()
 {
 	auto map = mgr.readData(this);
diff --git a/src/core/managed/Managed.hpp b/src/core/managed/Managed.hpp
index e38efea..7622e0e 100644
--- a/src/core/managed/Managed.hpp
+++ b/src/core/managed/Managed.hpp
@@ -28,6 +28,8 @@
 #ifndef _OUSIA_MANAGED_HPP_
 #define _OUSIA_MANAGED_HPP_
 
+#include <typeinfo>
+
 #include "Manager.hpp"
 
 namespace ousia {
@@ -67,6 +69,16 @@ protected:
 	 */
 	Manager &mgr;
 
+	/**
+	 * Used internally to retrieve the pointer of a stored data element. Behaves
+	 * just like readData but returns a pointer.
+	 *
+	 * @param key is the key specifying the data slot.
+	 * @param type is the type that is expected for the data with the given key.
+	 * @return previously stored data or nullptr.
+	 */
+	Managed* readDataPtr(const std::string &key, const std::type_info &type);
+
 public:
 	/**
 	 * Constructor of the Managed class. Associates the new instance with the
@@ -170,6 +182,36 @@ public:
 	 */
 	Rooted<Managed> readData(const std::string &key);
 
+	/**
+	 * Returns data previously stored under the given key. Makes sure the data
+	 * is of the given type.
+	 *
+	 * @param key is the key specifying the slot from which the data should be
+	 * read.
+	 * @param type is the type that is expected for the data with the given key.
+	 * @return previously stored data or nullptr if no data was stored for this
+	 * key. Nullptr is returned if the stored data does not have the correct
+	 * type.
+	 */
+	Rooted<Managed> readData(const std::string &key, const Rtti *type);
+
+	/**
+	 * Returns data previously stored under the given key. Makes sure the data
+	 * is of the given type.
+	 *
+	 * @param key is the key specifying the slot from which the data should be
+	 * read.
+	 * @param type is the type that is expected for the data with the given key.
+	 * @return previously stored data or nullptr if no data was stored for this
+	 * key. Nullptr is returned if the stored data does not have the correct
+	 * type.
+	 */
+	template<typename T>
+	Rooted<T> readData(const std::string &key)
+	{
+		return Rooted<T>(static_cast<T*>(readDataPtr(key, typeid(T))));
+	}
+
 	/**
 	 * Returns a copy of all data that was attached to the node.
 	 *
-- 
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