[c++] Add filter templates

Author: mpsonntag

src/filters.h

@@ -0,0 +1,77 @@
+// Copyright (c) 2017, German Neuroinformatics Node (G-Node)
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted under the terms of the BSD License. See
+// LICENSE file in the root of the Project.
+
+#ifndef NIX_MX_FILTERS
+#define NIX_MX_FILTERS
+
+#include <nix.hpp>
+#include "mex.h"
+#include "datatypes.h"
+
+// filter template
+template<typename T, typename FN>
+std::vector<T> filterFileEntity(const extractor &input, FN ff) {
+    std::vector<T> res;
+
+    switch (input.num<uint8_t>(2)) {
+    case switchFilter::AcceptAll:
+        res = ff(nix::util::AcceptAll<T>());
+        break;
+    case switchFilter::Id:
+        res = ff(nix::util::IdFilter<T>(input.str(3)));
+        break;
+    case switchFilter::Ids:
+        // this will crash matlab, if its not a vector of strings...
+        res = ff(nix::util::IdsFilter<T>(input.vec<std::string>(3)));
+        break;
+    case switchFilter::Type:
+        res = ff(nix::util::TypeFilter<T>(input.str(3)));
+        break;
+    case switchFilter::Name:
+        res = ff(nix::util::NameFilter<T>(input.str(3)));
+        break;
+    default: throw std::invalid_argument("unknown or unsupported filter");
+    }
+
+    return res;
+}
+
+template<typename T, typename FN>
+std::vector<T> filterEntity(const extractor &input, FN ff) {
+    std::vector<T> res;
+
+    switch (input.num<uint8_t>(2)) {
+    case switchFilter::AcceptAll:
+        res = ff(nix::util::AcceptAll<T>());
+        break;
+    case switchFilter::Id:
+        res = ff(nix::util::IdFilter<T>(input.str(3)));
+        break;
+    case switchFilter::Ids:
+        // this will crash matlab, if its not a vector of strings...
+        res = ff(nix::util::IdsFilter<T>(input.vec<std::string>(3)));
+        break;
+    case switchFilter::Type:
+        res = ff(nix::util::TypeFilter<T>(input.str(3)));
+        break;
+    case switchFilter::Name:
+        res = ff(nix::util::NameFilter<T>(input.str(3)));
+        break;
+    case switchFilter::Metadata:
+        res = ff(nix::util::MetadataFilter<T>(input.str(3)));
+        break;
+    case switchFilter::Source:
+        res = ff(nix::util::SourceFilter<T>(input.str(3)));
+        break;
+    default: throw std::invalid_argument("unknown or unsupported filter");
+    }
+
+    return res;
+}
+
+#endif