Added a root akka folder for source files for the docs to work properly, closing ticket #541

akka-actor/src/main/scala/akka/util/HashCode.scala

@@ -0,0 +1,57 @@
+/**
+ * Copyright (C) 2009-2010 Scalable Solutions AB <http://scalablesolutions.se>
+ */
+
+package akka.util
+
+import java.lang.reflect.{Array => JArray}
+import java.lang.{Float => JFloat, Double => JDouble}
+
+/**
+ * Set of methods which allow easy implementation of <code>hashCode</code>.
+ *
+ * Example:
+ * <pre>
+ *  override def hashCode: Int = {
+ *    var result = HashCode.SEED
+ *    //collect the contributions of various fields
+ *    result = HashCode.hash(result, fPrimitive)
+ *    result = HashCode.hash(result, fObject)
+ *    result = HashCode.hash(result, fArray)
+ *    result
+ *  }
+ * </pre>
+ *
+ * @author <a href="http://jonasboner.com">Jonas Bon&#233;r</a>
+ */
+object HashCode {
+  val SEED = 23
+
+  def hash(seed: Int, any: Any): Int = any match {
+    case value: Boolean => hash(seed, value)
+    case value: Char => hash(seed, value)
+    case value: Short => hash(seed, value)
+    case value: Int => hash(seed, value)
+    case value: Long => hash(seed, value)
+    case value: Float => hash(seed, value)
+    case value: Double => hash(seed, value)
+    case value: Byte => hash(seed, value)
+    case value: AnyRef =>
+      var result = seed
+      if (value eq null) result = hash(result, 0)
+      else if (!isArray(value)) result = hash(result, value.hashCode())
+      else for (id <- 0 until JArray.getLength(value)) result = hash(result, JArray.get(value, id)) // is an array
+      result
+  }
+  def hash(seed: Int, value: Boolean): Int = firstTerm(seed) + (if (value) 1 else 0)
+  def hash(seed: Int, value: Char): Int = firstTerm(seed) + value.asInstanceOf[Int]
+  def hash(seed: Int, value: Int): Int = firstTerm(seed) + value
+  def hash(seed: Int, value: Long): Int = firstTerm(seed)  + (value ^ (value >>> 32) ).asInstanceOf[Int]
+  def hash(seed: Int, value: Float): Int = hash(seed, JFloat.floatToIntBits(value))
+  def hash(seed: Int, value: Double): Int = hash(seed, JDouble.doubleToLongBits(value))
+
+  private def firstTerm(seed: Int): Int = PRIME * seed
+  private def isArray(anyRef: AnyRef): Boolean = anyRef.getClass.isArray
+  private val PRIME = 37
+}
+