Added getDouble(Object) as utility method

src/main/java/no/nibio/vips/util/ModelUtil.java

@@ -24,11 +24,14 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import java.io.BufferedInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.math.BigDecimal;
+import java.math.BigInteger;
 import java.net.URLConnection;
 import java.util.List;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import no.nibio.vips.entity.WeatherObservation;
+import no.nibio.vips.model.ConfigValidationException;
 import org.apache.commons.codec.binary.Base64;
 import org.apache.commons.io.IOUtils;
 
@@ -145,4 +148,54 @@ public class ModelUtil {
             return mapper.convertValue(unknownClassList, new TypeReference<List<WeatherObservation>>(){});
         }
     }
+    
+    public Double getDouble(Object possibleNumber) throws ConfigValidationException
+    {
+    	if(possibleNumber == null)
+    	{
+    		return null;
+    	}
+    	
+    	if(possibleNumber instanceof String)
+    	{
+    		try
+    		{
+    			return Double.valueOf((String) possibleNumber);
+    		}
+    		catch(NumberFormatException ex)
+    		{
+    			throw new ConfigValidationException(ex.getMessage());
+    		}
+    	}
+    	if(possibleNumber instanceof Integer)
+    	{
+    		return ((Integer) possibleNumber).doubleValue();
+    	}
+    	if(possibleNumber instanceof Float)
+    	{
+    		return ((Float) possibleNumber).doubleValue();
+    	}
+    	if(possibleNumber instanceof Double)
+    	{
+    		return (Double) possibleNumber;
+    	}
+    	// Clutching at straws
+    	if(possibleNumber instanceof BigInteger)
+    	{
+    		return ((BigInteger) possibleNumber).doubleValue();
+    	}
+    	if(possibleNumber instanceof BigDecimal)
+    	{
+    		return ((BigDecimal) possibleNumber).doubleValue();
+    	}
+    	// Out of options. Throw Exception
+    	try
+    	{
+    		return (Double) possibleNumber;
+    	}
+    	catch(ClassCastException ex)
+    	{
+    		throw new ConfigValidationException(ex.getMessage());
+    	}
+    }
 }

src/test/java/no/nibio/vips/util/ModelUtilTest.java

@@ -20,7 +20,10 @@ package no.nibio.vips.util;
 
 import java.io.BufferedInputStream;
 import java.io.IOException;
+import java.math.BigDecimal;
+import java.math.BigInteger;
 import junit.framework.TestCase;
+import no.nibio.vips.model.ConfigValidationException;
 
 /**
  *
@@ -80,6 +83,6 @@ public class ModelUtilTest extends TestCase {
         
     }
 
-    
+        
     
 }