[c++/m] Add Source getSourceByIndex function

Author: mpsonntag

+nix/Source.m

@@ -49,6 +49,11 @@
                 'Source::openSource', id_or_name, @nix.Source);
         end;
 
+        function retObj = open_source_idx(obj, idx)
+            retObj = nix.Utils.open_entity(obj, ...
+                'Source::openSourceIdx', idx, @nix.Source);
+        end;
+
         function retObj = parent_source(obj)
             retObj = nix.Utils.fetchObj('Source::parentSource', ...
                 obj.nix_handle, @nix.Source);

nix_mx.cc

@@ -266,6 +266,7 @@ void mexFunction(int            nlhs,
             .reg("referringDataArrays", GETTER(std::vector<nix::DataArray>, nix::Source, referringDataArrays))
             .reg("referringTags", GETTER(std::vector<nix::Tag>, nix::Source, referringTags))
             .reg("referringMultiTags", GETTER(std::vector<nix::MultiTag>, nix::Source, referringMultiTags));
+        methods->add("Source::openSourceIdx", nixsource::openSourceIdx);
 
         classdef<nix::Tag>("Tag", methods)
             .desc(&nixtag::describe)

src/nixsource.cc

@@ -27,4 +27,10 @@ namespace nixsource {
         return sb.array();
     }
 
+    void openSourceIdx(const extractor &input, infusor &output) {
+        nix::Source currObj = input.entity<nix::Source>(1);
+        nix::ndsize_t idx = (nix::ndsize_t)input.num<double>(2);
+        output.set(0, currObj.getSource(idx));
+    }
+
 } // namespace nixsource

src/nixsource.h

@@ -15,6 +15,8 @@ namespace nixsource {
 
     mxArray *describe(const nix::Source &source);
 
+    void openSourceIdx(const extractor &input, infusor &output);
+
 } // namespace nixsource
 
 #endif

tests/TestSource.m

@@ -17,6 +17,7 @@
     funcs{end+1} = @test_fetch_sources;
     funcs{end+1} = @test_has_source;
     funcs{end+1} = @test_open_source;
+    funcs{end+1} = @test_open_source_idx;
     funcs{end+1} = @test_source_count;
     funcs{end+1} = @test_parent_source;
     funcs{end+1} = @test_set_metadata;
@@ -68,6 +69,20 @@
     assert(isempty(getNonSource));
 end
 
+function [] = test_open_source_idx( varargin )
+%% Test Open Source by index
+    f = nix.File(fullfile(pwd, 'tests', 'testRW.h5'), nix.FileMode.Overwrite);
+    b = f.create_block('testBlock', 'nixBlock');
+    s = b.create_source('testSource', 'nixSource');
+    s1 = s.create_source('testSource1', 'nixSource');
+    s2 = s.create_source('testSource2', 'nixSource');
+    s3 = s.create_source('testSource3', 'nixSource');
+
+    assert(strcmp(f.blocks{1}.sources{1}.open_source_idx(0).name, s1.name));
+    assert(strcmp(f.blocks{1}.sources{1}.open_source_idx(1).name, s2.name));
+    assert(strcmp(f.blocks{1}.sources{1}.open_source_idx(2).name, s3.name));
+end
+
 %% Test: Source count
 function [] = test_source_count( varargin )
     testFile = fullfile(pwd, 'tests', 'testRW.h5');