From 0a8f34c27c6ef93c5c94d17728af62c7607e225f Mon Sep 17 00:00:00 2001
From: Ben Culkin <scorpress@gmail.com>
Date: Thu, 3 Dec 2020 19:21:38 -0500
Subject: Rename types to match Java style

This renames several interfaces that had names like IWhatever, since
that isn't a style that Java uses
---
 src/main/java/bjc/data/Context.java | 62 +++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/main/java/bjc/data/Context.java

(limited to 'src/main/java/bjc/data/Context.java')

diff --git a/src/main/java/bjc/data/Context.java b/src/main/java/bjc/data/Context.java
new file mode 100644
index 0000000..7efdc4d
--- /dev/null
+++ b/src/main/java/bjc/data/Context.java
@@ -0,0 +1,62 @@
+package bjc.data;
+
+/**
+ * Represents a 'context' which is a hierarchical set of objects.
+ * @author Ben Culkin
+ *
+ */
+public interface Context {
+	/**
+	 * Register an object with this context.
+	 * 
+	 * @param name The name of the object.
+	 * @param o The object to register.
+	 */
+	void register(String name, Object o);
+
+	/**
+	 * Get the parent of this context.
+	 * 
+	 * @return The parent of this context.
+	 */
+	Context getParent();
+
+	/**
+	 * Get an object from this context.
+	 * 
+	 * @param name The name of the object.
+	 * 
+	 * @return The object bound to that name.
+	 */
+	Object get(String name);
+	
+	/**
+	 * Get an object which is an instance of the provided class or a subclass
+	 * thereof.
+	 * 
+	 * @param <T> The type of the object.
+	 * 
+	 * @param contract The class of the object.
+	 * 
+	 * @return An instance of the provided class.
+	 */
+	<T> T get(Class<T> contract);
+	
+	/**
+	 * Get a named object which is an instance of the provided class or a subclass
+	 * thereof.
+	 * 
+	 * @param <T> The type of the object.
+	 * 
+	 * @param name The name of the object
+	 * @param contract The class of the object.
+	 * 
+	 * @return An instance of the provided class, with the given name..
+	 */
+	default <T> T get(String name, Class<T> contract) {
+		Object obj = get(name);
+		return obj == null 
+				? getParent().get(name, contract) 
+						: contract.cast(obj);
+	};
+}
-- 
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