Adding generated eTag to RPC style invocations

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@943389 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 19 insertions, 0 deletions

diff --git a/sca-java-2.x/trunk/modules/common-http/src/main/java/org/apache/tuscany/sca/common/http/HTTPUtil.java b/sca-java-2.x/trunk/modules/common-http/src/main/java/org/apache/tuscany/sca/common/http/HTTPUtil.java
index 3dc9f5891d..f810970869 100644
--- a/sca-java-2.x/trunk/modules/common-http/src/main/java/org/apache/tuscany/sca/common/http/HTTPUtil.java
+++ b/sca-java-2.x/trunk/modules/common-http/src/main/java/org/apache/tuscany/sca/common/http/HTTPUtil.java
@@ -19,6 +19,9 @@
 
 package org.apache.tuscany.sca.common.http;
 
+import java.math.BigInteger;
+import java.security.MessageDigest;
+
 import javax.servlet.http.HttpServletRequest;
 
 /**
@@ -71,4 +74,20 @@ public class HTTPUtil {
         
         return contextRoot;
     }
+    
+    public static String calculateHashETag(byte[] content) {
+            String eTag = "invalid";
+            try {
+                MessageDigest messageDigest = MessageDigest.getInstance("MD5");
+                byte[] digest = messageDigest.digest(content);
+                BigInteger number = new BigInteger(1, digest);
+                StringBuffer sb = new StringBuffer('0');
+                sb.append(number.toString(16));
+                eTag = sb.toString();
+            } catch(Exception e) {
+                //ignore, we will return random etag
+                eTag =  Integer.toString((new java.util.Random()).nextInt(Integer.MAX_VALUE));
+            }
+            return eTag;
+    }
 }