[io][input_information] rework to insure url exists even if using a spec file

est/app/utils/__init__.py

@@ -119,23 +119,8 @@ def get_xas_obj(
     :param spec_input: tuple of Union[str, None, dict]
     :param float timeout: read time out (for hdf5 only for now)
     """
-    if input_information.is_spec_input():
-        if has_read_spectrum:
-            energy, mu = read_spectrum(
-                spec_file=input_information.spec_file,
-                energy_col_name=input_information.input_energy_col_name,
-                absorption_col_name=input_information.input_abs_col_name,
-                monitor_col_name=input_information.input_monitor_col_name,
-                energy_unit=input_information.energy_unit,
-                scan_header_S=input_information.scan_title,
-            )
-            spectrum = Spectrum(energy=energy, mu=mu)
-            xas_obj = XASObject(energy=energy, spectra=(spectrum,), dim1=1, dim2=1)
-        else:
-            raise ValueError("Unable to read spectrum")
-    else:
-        sp, en, conf = read_xas(information=input_information, timeout=timeout)
-        xas_obj = XASObject(spectra=sp, energy=en, configuration=conf)
+    sp, en, conf = read_xas(information=input_information, timeout=timeout)
+    xas_obj = XASObject(spectra=sp, energy=en, configuration=conf)
     attr_names = "I0", "I1", "I2", "mu_ref"
     attr_values = (
         getattr(input_information, "I0", None),

est/io/utils/information.py

@@ -57,6 +57,22 @@ class SpecInputInformation:
         self.input_abs_col_name = input_abs_col_name
         self.input_monitor_col_name = input_monitor_col_name
 
+    @property
+    def spectra_url(self):
+        return DataUrl(
+            file_path=self.spec_file,
+            scheme="PyMca",
+            data_path=self.input_abs_col_name,
+        )
+
+    @property
+    def channel_url(self):
+        return DataUrl(
+            file_path=self.spec_file,
+            scheme="PyMca",
+            data_path=self.energy_abs_col_name,
+        )
+
     @property
     def spec_file(self):
         return self.__spec_file
@@ -165,23 +181,41 @@ class InputInformation:
     def is_valid(self):
         """Return True if at least a spec file is provided or some url
         information"""
-        return self.spec_file is not None or self.has_url_information
+        return self.has_url_information
 
     @property
     def spectra_url(self):
-        return self.__spectra_url
+        if self.is_spec_input():
+            return self.spec_info.spectra_url
+        else:
+            return self.__spectra_url
 
     @spectra_url.setter
     def spectra_url(self, url):
+        if url is not None and self.is_spec_input():
+            raise ValueError(
+                "You cannot set an url for channel because a "
+                "this instance is already associated to spec "
+                "information."
+            )
         # TODO: maybe we want to add a check to create a DataUrl if this is a string...
         self.__spectra_url = url
 
     @property
     def channel_url(self):
-        return self.__channel_url
+        if self.is_spec_input():
+            return self.spec_info.channel_url
+        else:
+            return self.__channel_url
 
     @channel_url.setter
     def channel_url(self, url):
+        if url is not None and self.is_spec_input():
+            raise ValueError(
+                "You cannot set an url for channel because a "
+                "this instance is already associated to spec "
+                "information."
+            )
         self.__channel_url = url
 
     @property
@@ -246,6 +280,12 @@ class InputInformation:
 
     @mu_ref_url.setter
     def mu_ref_url(self, url):
+        if url is not None and self.is_spec_input():
+            raise ValueError(
+                "You cannot set an url for channel because a "
+                "this instance is already associated to spec"
+                "information."
+            )
         self.__mu_ref_url = url
 
     @property