Desktop file parser initial commit

src/core/desktopfilereader.cpp

@@ -0,0 +1,75 @@
+#include <utility>
+
+// local headers
+#include "desktopfilereader.h"
+
+namespace bf = boost::filesystem;
+
+class DesktopFileReader::PrivateData {
+public:
+    bf::path path;
+
+public:
+    bool isEmpty()  {
+        return path.empty();
+    }
+
+    void assertPathIsNotEmptyAndFileExists() {
+        if (path.empty())
+            throw std::invalid_argument("empty path is not permitted");
+
+        if (!bf::exists(path))
+            throw std::runtime_error("path does not exist: " + path.string());
+    }
+
+    void copyData(const std::shared_ptr<PrivateData>& other) {
+        path = other->path;
+    }
+};
+
+DesktopFileReader::DesktopFileReader() : d(new PrivateData) {}
+
+DesktopFileReader::DesktopFileReader(boost::filesystem::path path) : DesktopFileReader() {
+    d->path = std::move(path);
+    d->assertPathIsNotEmptyAndFileExists();
+}
+
+DesktopFileReader::DesktopFileReader(const DesktopFileReader& other) : DesktopFileReader() {
+    d->path = other.d->path;
+}
+
+DesktopFileReader& DesktopFileReader::operator=(const DesktopFileReader& other) {
+    if (this != &other) {
+        // set up a new instance of PrivateData, and copy data over from other object
+        d.reset(new PrivateData);
+        d->copyData(other.d);
+    }
+
+    return *this;
+}
+
+DesktopFileReader& DesktopFileReader::operator=(DesktopFileReader&& other) noexcept {
+    if (this != &other) {
+        // move other object's data into this one, and remove reference there
+        d = other.d;
+        other.d = nullptr;
+    }
+
+    return *this;
+}
+
+bool DesktopFileReader::isEmpty() {
+    return d->isEmpty();
+}
+
+bool DesktopFileReader::operator==(const DesktopFileReader& other) const {
+    return d->path == other.d->path;
+}
+
+bool DesktopFileReader::operator!=(const DesktopFileReader& other) const {
+    return !operator==(other);
+}
+
+boost::filesystem::path DesktopFileReader::path() {
+    return d->path;
+}