From 87ae1dfc8d8cb7b51d7bda4750ce841bbe691cfc Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Sat, 7 May 2016 12:51:23 -0400
Subject: General changes

---
 .../java/bjc/utils/funcdata/IFunctionalList.java   | 10 +++
 .../main/java/bjc/utils/funcdata/PushdownMap.java  | 91 ++++++++++++++++++++++
 .../java/bjc/utils/funcdata/theory/Bifunctor.java  | 66 ++++++++++++++++
 .../java/bjc/utils/funcdata/theory/Functor.java    | 39 ++++++++++
 .../bjc/utils/funcdata/theory/package-info.java    |  7 ++
 5 files changed, 213 insertions(+)
 create mode 100644 BJC-Utils2/src/main/java/bjc/utils/funcdata/PushdownMap.java
 create mode 100644 BJC-Utils2/src/main/java/bjc/utils/funcdata/theory/Bifunctor.java
 create mode 100644 BJC-Utils2/src/main/java/bjc/utils/funcdata/theory/Functor.java
 create mode 100644 BJC-Utils2/src/main/java/bjc/utils/funcdata/theory/package-info.java

(limited to 'BJC-Utils2/src/main/java/bjc/utils/funcdata')

diff --git a/BJC-Utils2/src/main/java/bjc/utils/funcdata/IFunctionalList.java b/BJC-Utils2/src/main/java/bjc/utils/funcdata/IFunctionalList.java
index 91b2ba3..5327dbe 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/funcdata/IFunctionalList.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/funcdata/IFunctionalList.java
@@ -245,6 +245,16 @@ public interface IFunctionalList<ContainedType> {
 	 */
 	ContainedType randItem(Function<Integer, Integer> rnd);
 
+	/**
+	 * Select a random item from the list, using a default random number
+	 * generator
+	 * 
+	 * @return A random item from the list
+	 */
+	default ContainedType randItem() {
+		return randItem((num) -> (int) (Math.random() * num));
+	}
+
 	/**
 	 * Reduce this list to a single value, using a accumulative approach.
 	 * 
diff --git a/BJC-Utils2/src/main/java/bjc/utils/funcdata/PushdownMap.java b/BJC-Utils2/src/main/java/bjc/utils/funcdata/PushdownMap.java
new file mode 100644
index 0000000..cc31923
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/funcdata/PushdownMap.java
@@ -0,0 +1,91 @@
+package bjc.utils.funcdata;
+
+import java.util.function.BiConsumer;
+import java.util.function.Consumer;
+import java.util.function.Function;
+
+/**
+ * A map where
+ * 
+ * @author ben
+ *
+ * @param <KeyType>
+ * @param <ValueType>
+ */
+public class PushdownMap<KeyType, ValueType>
+		implements IFunctionalMap<KeyType, ValueType> {
+
+	@Override
+	public boolean containsKey(KeyType key) {
+		// TODO Auto-generated method stub
+		return false;
+	}
+
+	@Override
+	public IFunctionalMap<KeyType, ValueType> extend() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+	@Override
+	public void forEach(BiConsumer<KeyType, ValueType> action) {
+		// TODO Auto-generated method stub
+
+	}
+
+	@Override
+	public void forEachKey(Consumer<KeyType> action) {
+		// TODO Auto-generated method stub
+
+	}
+
+	@Override
+	public void forEachValue(Consumer<ValueType> action) {
+		// TODO Auto-generated method stub
+
+	}
+
+	@Override
+	public ValueType get(KeyType key) {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+	@Override
+	public int getSize() {
+		// TODO Auto-generated method stub
+		return 0;
+	}
+
+	@Override
+	public IFunctionalList<KeyType> keyList() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+	@Override
+	public <V2> IFunctionalMap<KeyType, V2> mapValues(
+			Function<ValueType, V2> transformer) {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+	@Override
+	public ValueType put(KeyType key, ValueType val) {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+	@Override
+	public ValueType remove(KeyType key) {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+	@Override
+	public IFunctionalList<ValueType> valueList() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+}
diff --git a/BJC-Utils2/src/main/java/bjc/utils/funcdata/theory/Bifunctor.java b/BJC-Utils2/src/main/java/bjc/utils/funcdata/theory/Bifunctor.java
new file mode 100644
index 0000000..3bea135
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/funcdata/theory/Bifunctor.java
@@ -0,0 +1,66 @@
+package bjc.utils.funcdata.theory;
+
+import java.util.function.Function;
+
+/**
+ * A functor over a pair of heterogenous types
+ * 
+ * @author ben
+ * @param <LeftType>
+ *            The type stored on the 'left' of the pair
+ * @param <RightType>
+ *            The type stored on the 'right' of the pair
+ *
+ */
+public interface Bifunctor<LeftType, RightType> {
+	/**
+	 * Lift a function to operate over the left part of this pair
+	 * 
+	 * @param <OldLeft>
+	 *            The old left type of the pair
+	 * @param <OldRight>
+	 *            The old right type of the pair
+	 * @param <NewLeft>
+	 *            The new left type of the pair
+	 * @param func
+	 *            The function to lift to work over the left side of the
+	 *            pair
+	 * @return The function lifted to work over the left side of bifunctors
+	 */
+	public <OldLeft, OldRight, NewLeft>
+			Function<Bifunctor<OldLeft, OldRight>, Bifunctor<NewLeft, OldRight>>
+			fmapLeft(Function<OldLeft, NewLeft> func);
+
+	/**
+	 * Lift a function to operate over the right part of this pair
+	 * 
+	 * @param <OldLeft>
+	 *            The old left type of the pair
+	 * @param <OldRight>
+	 *            The old right type of the pair
+	 * @param <NewRight>
+	 *            The new right type of the pair
+	 * @param func
+	 *            The function to lift to work over the right side of the
+	 *            pair
+	 * @return The function lifted to work over the right side of
+	 *         bifunctors
+	 */
+	public <OldLeft, OldRight, NewRight>
+			Function<Bifunctor<OldLeft, OldRight>, Bifunctor<OldLeft, NewRight>>
+			fmapRight(Function<OldRight, NewRight> func);
+
+	/**
+	 * Get the value contained on the left of this bifunctor
+	 * 
+	 * @return The value on the left side of this bifunctor
+	 */
+	public LeftType getLeft();
+
+	/**
+	 * Get the value contained on the right of this bifunctor
+	 * 
+	 * @return The value on the right of this bifunctor
+	 */
+	public RightType getRight();
+}
diff --git a/BJC-Utils2/src/main/java/bjc/utils/funcdata/theory/Functor.java b/BJC-Utils2/src/main/java/bjc/utils/funcdata/theory/Functor.java
new file mode 100644
index 0000000..76f48e2
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/funcdata/theory/Functor.java
@@ -0,0 +1,39 @@
+package bjc.utils.funcdata.theory;
+
+import java.util.function.Function;
+
+/**
+ * Represents a container or context some sort usually, but the precise
+ * definition is that it represents exactly what it is defined as
+ * 
+ * @author ben
+ * @param <ContainedType>
+ *            The value inside the functor
+ */
+public interface Functor<ContainedType> {
+	/**
+	 * Converts a normal function to operate over values in a functor.
+	 * 
+	 * N.B: Even though the type signature implies that you can apply the
+	 * resulting function to any type of functor, it is only safe to call
+	 * it on instances of the type of functor you called fmap on.
+	 * 
+	 * @param <ArgType>
+	 *            The argument of the function
+	 * @param <ReturnType>
+	 *            The return type of the function
+	 * @param func
+	 *            The function to convert
+	 * @return The passed in function converted to work over a particular
+	 *         type of functors
+	 */
+	public <ArgType, ReturnType> Function<Functor<ArgType>, Functor<ReturnType>> fmap(
+			Function<ArgType, ReturnType> func);
+
+	/**
+	 * Retrieve the thing inside this functor
+	 * 
+	 * @return The thing inside this functor
+	 */
+	public ContainedType getValue();
+}
diff --git a/BJC-Utils2/src/main/java/bjc/utils/funcdata/theory/package-info.java b/BJC-Utils2/src/main/java/bjc/utils/funcdata/theory/package-info.java
new file mode 100644
index 0000000..33c80d6
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/funcdata/theory/package-info.java
@@ -0,0 +1,7 @@
+/**
+ * Random functional type things that don't belong elsewhere
+ * 
+ * @author ben
+ *
+ */
+package bjc.utils.funcdata.theory;
\ No newline at end of file
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