Got parsing of property files to work. Fixed some annoyances. Added a version class to handle parsing versions from the properties file

src/main/java/com/sothr/imagetools/App.java

@@ -38,6 +38,7 @@ public class App extends Application
     @Override
     public void init() throws Exception{
         AppConfig.configLogging();
+        AppConfig.loadProperties();
         logger = LoggerFactory.getLogger(this.getClass());
         logger.info("Initializing Image Tools");
         List<String> parameters = this.getParameters().getRaw();
@@ -75,6 +76,7 @@ public class App extends Application
     @Override
     public void stop() throws Exception {
         logger.info("Image-Tools is shutting down");
+        AppConfig.saveProperties();
         super.stop();
     }
 }

src/main/java/com/sothr/imagetools/AppConfig.java

@@ -1,5 +1,6 @@
 package com.sothr.imagetools;
 
+import com.sothr.imagetools.util.PropertiesService;
 import org.apache.log4j.PropertyConfigurator;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -11,15 +12,22 @@ class AppConfig {
 
     private static Logger logger;
 
+    //Logging defaults
     private static final String LOGSETTINGSFILE = "./log4j.properties";
+    private static Boolean configuredLogging = false;
 
-    public static void configLogging() {
+    //Properties defaults
+    private static final String DEFAULTPROPERTIESFILE = "default.properties";
+    private static final String USERPROPERTIESFILE = "./config.xml";
+    private static Boolean loadedProperties = false;
+
+    public static void configLogging(String location) {
         //Logging Config
-        File file = new File(LOGSETTINGSFILE);
+        File file = new File(location);
         Boolean fromFile = false;
         if (file.exists()) {
             fromFile = true;
-            PropertyConfigurator.configure(LOGSETTINGSFILE);
+            PropertyConfigurator.configure(location);
         } else {
             //Simple error logging configuration
             Properties defaultProps = new Properties();
@@ -38,4 +46,28 @@ class AppConfig {
         logger.info(String.format("Configured Logger %s", message));
     }
 
+    //Only configure logging from the default file once
+    public static void configLogging() {
+        if (!configuredLogging) {
+            configLogging(LOGSETTINGSFILE);
+            configuredLogging = true;
+        }
+    }
+
+    public static void loadProperties() {
+        if (!loadedProperties) {
+            File file = new File(USERPROPERTIESFILE);
+            if (file.exists()) {
+                PropertiesService.loadProperties(DEFAULTPROPERTIESFILE, USERPROPERTIESFILE);
+            } else {
+                PropertiesService.loadProperties(DEFAULTPROPERTIESFILE, null);
+            }
+            loadedProperties = true;
+        }
+    }
+
+    public static void saveProperties() {
+        PropertiesService.saveXMLProperties(USERPROPERTIESFILE);
+    }
+
 }

src/main/resources/default.properties

@@ -6,16 +6,16 @@ version=${project.version}
 #images must be 90% similar
 image.differenceThreshold=0.90
 #control generation of hashes for new images.
-image.ahash=true
-image.ahashWeight=0.70
-image.dhash=true
-image.dhashWeight=0.85
+image.ahash.use=true
+image.ahash.weight=0.70
+image.dhash.use=true
+image.dhash.weight=0.85
 #set to false if hashing images is taking too long
-image.phash=true
-image.phashWeight=1.0
+image.phash.use=true
+image.phash.weight=1.0
 
 #Default Thumbnail Settings
 #Directory where to store thumbnails
-thumbnail.directory=/cache/thumbnails/
+thumbnail.directory=./cache/thumbnails/
 #Size of the thumbnail to generate and store
 thumbnail.size=128

src/main/scala/com/sothr/imagetools/util/PropertiesService.scala

@@ -2,32 +2,69 @@ package com.sothr.imagetools.util
 
 import java.util.Properties
 import grizzled.slf4j.Logging
+import java.io.{FileInputStream, FileOutputStream, OutputStream}
+import scala.collection.JavaConversions._
 
 /*
  * Service for loading and interacting with the properties file
  */
 object PropertiesService extends Logging {
 
-  val properties:Properties = new Properties()
+  private val properties:Properties = new Properties()
+  private var version:Version = null
+  private val propertiesToClean:Array[String] = Array("version")
 
   /*
    * Load the properties file from the specified location
    */
-  def loadProperties(location:String) = {
-    info(s"Attempting to load properties from: $location")
-    val inputStream = ResourceLoader.get.getResourceStream(location)
-    val splitLocation = location.split("""\.""")
-    if (splitLocation(splitLocation.length) equals "xml") {
-      properties.loadFromXML(inputStream)
-    } else if (splitLocation(splitLocation.length) equals "properties") { 
-      properties.load(inputStream);
+  def loadProperties(defaultLocation:String, userLocation:String = null) = {
+    info(s"Attempting to load properties from: $defaultLocation")
+    val defaultInputStream = ResourceLoader.get.getResourceStream(defaultLocation)
+    properties.load(defaultInputStream)
+    if (userLocation != null) {
+      val userInputStream = new FileInputStream(userLocation)
+      val userProperties = new Properties();
+      userProperties.loadFromXML(userInputStream)
+
+      for (propertyName:String <- userProperties.stringPropertyNames()) {
+        properties.setProperty(propertyName, userProperties.getProperty(propertyName));
+      }
     } else {
-      error("Unable to load the properties file because it is not in the .properties or .xml format")
+      info("No user properties file exists to load from")
+    }
+    version = new Version(properties.getProperty("version"));
+    info(s"Detected Version: $version")
+  }
+
+  /**
+   * Gets a properties object that is cleaned of things that are expected to change. i.e. version
+   */
+  private def getCleanProperties():Properties = {
+    val cleanProperties:Properties = properties.clone().asInstanceOf[Properties]
+    //Remove properties to be cleaned
+    for (key <- propertiesToClean) {
+      cleanProperties.remove(key)
     }
+    return cleanProperties
+  }
+
+  def saveXMLProperties(location:String) = {
+    info(s"Saving user properties to $location")
+    val out:OutputStream = new FileOutputStream(location, false)
+    val cleanProperties = getCleanProperties
+    //insert special keys here
+    cleanProperties.setProperty("version.previous", version.toString())
+    cleanProperties.storeToXML(out, "User Properties")
+    out.flush()
+    out.close()
   }
 
-  def saveProperties(location:String) = {
+  def get(key:String):String = {
+    return properties.getProperty(key)
+  }
 
+  def set(key:String, value:String) = {
+    properties.setProperty(key, value)
   }
 
 }

src/main/scala/com/sothr/imagetools/util/Version.scala

@@ -0,0 +1,17 @@
+package com.sothr.imagetools.util
+
+/**
+ * Created by drew on 1/6/14.
+ */
+class Version(val versionString:String) {
+  //parse version into parts
+  val (major,minor,revision,buildType) = {
+    val splitVersion = versionString.split("""\.""")
+    val splitType = splitVersion(splitVersion.length-1).split("""-""")
+    (splitVersion(0),splitVersion(1),splitType(0),splitType(1))
+  }
+
+  override def toString():String = {
+    return s"$major.$minor.$revision-$buildType"
+  }
+}