Added Circular Buffers for Convenience (#26)

* circular buffers

* fix

* Update build.gradle

build.gradle

@@ -32,7 +32,7 @@ dependencies {
 }
 
 group = 'org.team5499'
-version = '2.2.1'
+version = '2.3.0'
 
 task sourcesJar(type: Jar) {
     from sourceSets.main.allJava

src/main/kotlin/org/team5499/monkeyLib/util/CircularBuffer.kt

@@ -0,0 +1,29 @@
+package org.team5499.monkeyLib.util
+
+public open class CircularBuffer<T>(maxSize: Int) {
+
+    private val mMaxSize: Int
+
+    public val elements: MutableList<T>
+
+    init {
+        mMaxSize = maxSize
+        if (mMaxSize <= 0) {
+            throw IllegalArgumentException("maxSize must be a positive integer.")
+        }
+        elements = mutableListOf()
+    }
+
+    public fun add(element: T): T? {
+        elements.add(element)
+        if (elements.size > mMaxSize) {
+            val poppedValue = elements.removeAt(0)
+            return poppedValue
+        }
+        return null
+    }
+
+    public fun clear() {
+        elements.clear()
+    }
+}

src/main/kotlin/org/team5499/monkeyLib/util/CircularDoubleBuffer.kt

@@ -0,0 +1,18 @@
+package org.team5499.monkeyLib.util
+
+public class CircularDoubleBuffer(maxSize: Int) : CircularBuffer<Double>(maxSize) {
+
+    public val sum: Double
+        get() {
+            var total = 0.0
+            for (num in super.elements) {
+                total += num
+            }
+            return total
+        }
+
+    public val average: Double
+        get() {
+            return sum / super.elements.size.toDouble()
+        }
+}