Added ErrorSummaryFactory for fault management

src/main/java/net/ivoa/xml/uws/v1/ErrorSummaryFactory.java

+package net.ivoa.xml.uws.v1;
+
+public class ErrorSummaryFactory {
+    
+    public static ErrorSummary newErrorSummary(VOSpaceFault error)
+    {
+        ErrorSummary result = new ErrorSummary();
+        result.setMessage(error.getFaultRepresentation());
+        result.setType(error.getType());
+        // Set to false since /error endpoint is not supported yet
+        result.setHasDetail(false);
+        return result;        
+    }
+    
+    // NFC: ErrorType usage is not covered in documentation, as far as I can see
+    // these are tentative default values.    
+    public enum VOSpaceFault {
+        // pushto
+        OPERATION_NOT_SUPPORTED("OperationNotSupported", ErrorType.FATAL),
+        INTERNAL_FAULT("InternalFault", ErrorType.TRANSIENT),
+        PERMISSION_DENIED("PermissionDenied", ErrorType.FATAL),
+        VIEW_NOT_SUPPORTED("ViewNotSupported", ErrorType.FATAL),
+        PROTOCOL_NOT_SUPPORTED("ProtocolNotSupported", ErrorType.FATAL),
+        INVALID_ARGUMENT("InvalidArgument", ErrorType.FATAL),
+        NODE_BUSY("NodeBusy", ErrorType.TRANSIENT),
+        // additional for pullto
+        INVALID_URI("InvalidURI", ErrorType.FATAL),
+        INVALID_DATA("InvalidData", ErrorType.FATAL),
+        // additional for pullfrom
+        NODE_NOT_FOUND("NodeNotFound", ErrorType.FATAL),
+        // additional for pushfrom
+        TRANSFER_FAILED("TransferFailed", ErrorType.FATAL),
+        // additional for movenode/copynode
+        DUPLICATE_NODE("DuplicateNode", ErrorType.FATAL);
+        
+
+        private final String faultRepresentation;
+        private final ErrorType type;
+        
+        private VOSpaceFault(String faultRepresentation, ErrorType type)
+        {
+            this.faultRepresentation = faultRepresentation;
+            this.type = type;
+        }
+        
+        public String getFaultRepresentation()
+        {
+            return this.faultRepresentation;
+        }
+        
+        public ErrorType getType()
+        {
+            return this.type;
+        }
+               
+    }
+        
+}