Adding utility APIs for Metadata Exchange 
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                 Key: AXIS2-2267
                 URL: https://issues.apache.org/jira/browse/AXIS2-2267
             Project: Axis 2.0 (Axis2)
          Issue Type: Improvement
          Components: modules
    Affects Versions: nightly
            Reporter: Gee Chia
             Fix For: nightly


The patch includes utility APIs and minor bug fixes described below:

  org.apache.axis2.dataretrieval changes:
      1. ServiceData - changed from protected interface/API to public (so 
customized data locator has access to the APIs)
      2. DataLocatorFactory (protected api changed to public )
      3. DataRetrievalUtil::convertOMElement - throws exception to handle  the 
case when  there is no ServiceData.xml to load

AxisService::getWSDL, 
       if (result != null && result.length > 0) - check length for non-empty 
data result array

Mex Module (org.apache.axis2.mex package)
     Basically, added fromOM mehtods to populate java class object from 
OMElement, also following convenient APIs, and 
     clean-up.

     1.   MexUtil - new APIs
           public static Metadata fromOM(OMElement omElement) throws 
MexException{}
           public static Metadata fromOM(OMElement omElement, String 
mexNamespaceValue) throws MexException{
     2. Metadata new APIs       
          public MetadataSection[] getMetadataSection(String dialect )
          public MetadataSection[] getMetadataSection(String dialect, String 
identifier)
          public MetadataSection[] getMetadataSection(String dialect, String 
identifier, OutputForm form)

 3. Other misc changes/fixes
     MetadataReference - Added getEPRElement, toOM deal with EPR, etc.
     Message Receiver - dialet to dialect

Sample Usage:

Sample usage - Please refer java doc for details.
         
          Metadata metadata = MexUtil.fromOM(result);

         // Return all WSDL  metadata sections 
          MetadataSection[] sections = 
metadata.getMetadataSection("http://schemas.xmlsoap.org/wsdl/";); 
         
        // Return all  inline WSDL  metadata sections 
          metadata.getMetadataSection("http://schemas.xmlsoap.org/wsdl/";, null, 
OutputForm.INLINE_FORM);


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