Add a whole bunch of Optics

This adds a whole bunch of types/functions related to optics. With this
batch, I've mainly gone for the concrete representation types, instead
of var Laarhoven or profunctor representations.

The concrete ones require less infrastructure, though they are not as
easy to compose

There's also a number of misc. things in here

1 files changed, 32 insertions, 0 deletions

diff --git a/src/main/java/bjc/optics/Optic.java b/src/main/java/bjc/optics/Optic.java
new file mode 100644
index 0000000..389da21
--- /dev/null
+++ b/src/main/java/bjc/optics/Optic.java
@@ -0,0 +1,32 @@
+/* 
+ * esodata - data structures and other things, of varying utility
+ * Copyright 2022, Ben Culkin
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *   
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package bjc.optics;
+
+/**
+ * General interface for optics of varying sorts
+ * 
+ * @author bjcul
+ *
+ * @param <W1> The first item the optic is used on
+ * @param <W2> The second item the optic is used on
+ * @param <P1> The first item the optic focuses on
+ * @param <P2> The second item the optic focuses on
+ */
+public interface Optic<W1, W2, P1, P2> {
+	// Marker interface
+}