From 3869f2b3020806effa330da3027a40d1a72d577f Mon Sep 17 00:00:00 2001
From: Drew Short <nerian.drew@gmail.com>
Date: Wed, 8 Jan 2014 16:08:12 -0500
Subject: [PATCH] Added a new enum class for know properties. Started fleshing
 out the HashService and how it will generate hashes. Added a hamming object
 to calculate hamming distances between two long values

---
 .../sothr/imagetools/hash/HashService.scala   | 30 +++++++++++++++++--
 .../com/sothr/imagetools/util/Hamming.scala   | 18 +++++++++++
 .../imagetools/util/PropertiesEnum.scala      | 17 +++++++++++
 3 files changed, 62 insertions(+), 3 deletions(-)
 create mode 100644 src/main/scala/com/sothr/imagetools/util/Hamming.scala
 create mode 100644 src/main/scala/com/sothr/imagetools/util/PropertiesEnum.scala

diff --git a/src/main/scala/com/sothr/imagetools/hash/HashService.scala b/src/main/scala/com/sothr/imagetools/hash/HashService.scala
index 31330e0..c31221f 100644
--- a/src/main/scala/com/sothr/imagetools/hash/HashService.scala
+++ b/src/main/scala/com/sothr/imagetools/hash/HashService.scala
@@ -1,16 +1,40 @@
 package com.sothr.imagetools.hash
 
+import com.sothr.imagetools.dto.ImageHashDTO
+import com.sothr.imagetools.image.Image
+import com.sothr.imagetools.util.{PropertiesEnum, PropertiesService}
+
 object HashService {
 
-  def getAhash(imageData:Array[Array[Integer]]):Long = {
+  def getImageHashes(image:Image):ImageHashDTO = {
+    var ahash:Long = 0L
+    var dhash:Long = 0L
+    var phash:Long = 0L
+    
+    //Get Image Data
+    var imageData:Array[Array[Int]] = null
+    
+    if (PropertiesService.get(PropertiesEnum.UseAhash.toString) == "true") {
+      ahash = getAhash(imageData)
+    }
+    if (PropertiesService.get(PropertiesEnum.UseAhash.toString) == "true") {
+      dhash = getDhash(imageData)
+    }
+    if (PropertiesService.get(PropertiesEnum.UseAhash.toString) == "true") {
+      phash = getPhash(imageData)
+    }
+    return new ImageHashDTO(ahash, dhash, phash)
+  }
+
+  def getAhash(imageData:Array[Array[Int]]):Long = {
     return 0L
   }
 
-  def getDhash(imageData:Array[Array[Integer]]):Long = {
+  def getDhash(imageData:Array[Array[Int]]):Long = {
     return 0L
   }
 
-  def getPhash(imageData:Array[Array[Integer]]):Long = {
+  def getPhash(imageData:Array[Array[Int]]):Long = {
     return 0L
   }
 
diff --git a/src/main/scala/com/sothr/imagetools/util/Hamming.scala b/src/main/scala/com/sothr/imagetools/util/Hamming.scala
new file mode 100644
index 0000000..aa6dac6
--- /dev/null
+++ b/src/main/scala/com/sothr/imagetools/util/Hamming.scala
@@ -0,0 +1,18 @@
+package com.sothr.imagetools.util
+
+object Hamming {
+
+  /**
+   * Calculate the hamming distance between two longs
+   *
+   * @param hash1 The first hash to compare
+   * @param hash2 The second hash to compare
+   * @return
+   */
+  def getDistance(hash1: Long, hash2: Long): Int = {
+    //The XOR of hash1 and hash2 is converted to a binary string
+    //then the number of '1's is counted. This is the hamming distance
+    (hash1 ^ hash2).toBinaryString.count(_ == '1')
+  }
+
+}
\ No newline at end of file
diff --git a/src/main/scala/com/sothr/imagetools/util/PropertiesEnum.scala b/src/main/scala/com/sothr/imagetools/util/PropertiesEnum.scala
new file mode 100644
index 0000000..ef61015
--- /dev/null
+++ b/src/main/scala/com/sothr/imagetools/util/PropertiesEnum.scala
@@ -0,0 +1,17 @@
+package com.sothr.imagetools.util
+
+object PropertiesEnum extends Enumeration {
+  type PropertiesEnum = Value
+  val Version = Value("version")
+  //default image settings
+  val ImageDifferenceThreshold = Value("image.differenceThreshold")
+  val UseAhash = Value("image.ahash.use")
+  val AhashWeight = Value("image.ahash.weight")
+  val UseDhash = Value("image.dhash.use")
+  val DhashWeight = Value("image.dhash.weight")
+  val UsePhash = Value("image.phash.use")
+  val PhashWeight = Value("image.phash.weight")
+  //Default Thumbnail Settings
+  val ThumbnailDirectory = Value("thumbnail.directory")
+  val ThumbnailSize = Value("thumbnail.size")
+}
\ No newline at end of file