From fff6dc5d43539af05ae2679640240b8545b36947 Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Tue, 10 May 2016 21:58:08 -0400
Subject: Added interface to JDK collector API

---
 .../src/main/java/bjc/utils/funcdata/IList.java    | 29 +++++++++++++++++++---
 .../src/main/java/bjc/utils/funcdata/IMap.java     |  1 -
 2 files changed, 26 insertions(+), 4 deletions(-)

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

diff --git a/BJC-Utils2/src/main/java/bjc/utils/funcdata/IList.java b/BJC-Utils2/src/main/java/bjc/utils/funcdata/IList.java
index b6363e7..00ec653 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/funcdata/IList.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/funcdata/IList.java
@@ -6,6 +6,7 @@ import java.util.function.BiFunction;
 import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.function.Predicate;
+import java.util.stream.Collector;
 
 import bjc.utils.data.IPair;
 
@@ -18,7 +19,6 @@ import bjc.utils.data.IPair;
  *            The type in this list
  */
 public interface IList<ContainedType> {
-
 	/**
 	 * Add an item to this list
 	 * 
@@ -302,12 +302,35 @@ public interface IList<ContainedType> {
 	 *            The type of array to return
 	 * @return The list, as an array
 	 */
-	ContainedType[] toArray(ContainedType[] arrType);
+	public ContainedType[] toArray(ContainedType[] arrType);
 
 	/**
 	 * Convert the list into a iterable
 	 * 
 	 * @return An iterable view onto the list
 	 */
-	Iterable<ContainedType> toIterable();
+	public Iterable<ContainedType> toIterable();
+
+	/**
+	 * Reduce the contents of this list using a collector
+	 * 
+	 * @param <StateType>
+	 *            The intermediate accumulation type
+	 * @param <ReducedType>
+	 *            The final, reduced type
+	 * @param collector
+	 *            The collector to use for reduction
+	 * @return The reduced list
+	 */
+	public default <StateType, ReducedType> ReducedType collect(
+			Collector<ContainedType, StateType, ReducedType> collector) {
+		BiConsumer<StateType, ContainedType> accumulator =
+				collector.accumulator();
+
+		return reduceAux(collector.supplier().get(), (value, state) -> {
+			accumulator.accept(state, value);
+
+			return state;
+		}, collector.finisher());
+	}
 }
\ No newline at end of file
diff --git a/BJC-Utils2/src/main/java/bjc/utils/funcdata/IMap.java b/BJC-Utils2/src/main/java/bjc/utils/funcdata/IMap.java
index f5f7a26..243e58a 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/funcdata/IMap.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/funcdata/IMap.java
@@ -16,7 +16,6 @@ import java.util.function.Function;
  *
  */
 public interface IMap<KeyType, ValueType> {
-
 	/**
 	 * Check if this map contains the specified key
 	 * 
-- 
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