Added two methods to class Image, isExifTagSet() and isIptcTagSet(), to determine whether a tag is set.

3 files changed, 32 insertions, 0 deletions

diff --git a/src/libpyexiv2.cpp b/src/libpyexiv2.cpp
index f77b6c7..6eebbdd 100644
--- a/src/libpyexiv2.cpp
+++ b/src/libpyexiv2.cpp
@@ -88,6 +88,18 @@ namespace LibPyExiv2
 			throw Exiv2::Error(METADATA_NOT_READ);
 	}
 
+	bool Image::isExifTagSet(std::string key)
+	{
+		if(_dataRead)
+		{
+			Exiv2::ExifKey exifKey = Exiv2::ExifKey(key);
+			Exiv2::ExifMetadata::iterator i = _exifData.findKey(exifKey);
+			return (i != _exifData.end());
+		}
+		else
+			throw Exiv2::Error(METADATA_NOT_READ);
+	}
+
 	boost::python::tuple Image::getExifTag(std::string key)
 	{
 		if(_dataRead)
@@ -192,6 +204,18 @@ namespace LibPyExiv2
 			throw Exiv2::Error(METADATA_NOT_READ);
 	}
 
+	bool Image::isIptcTagSet(std::string key)
+	{
+		if(_dataRead)
+		{
+			Exiv2::IptcKey iptcKey = Exiv2::IptcKey(key);
+			Exiv2::IptcMetadata::iterator i = _iptcData.findKey(iptcKey);
+			return (i != _iptcData.end());
+		}
+		else
+			throw Exiv2::Error(METADATA_NOT_READ);
+	}
+
 	boost::python::tuple Image::getIptcTag(std::string key)
 	{
 		if(_dataRead)
diff --git a/src/libpyexiv2.hpp b/src/libpyexiv2.hpp
index 53cf532..559213d 100644
--- a/src/libpyexiv2.hpp
+++ b/src/libpyexiv2.hpp
@@ -56,6 +56,9 @@ namespace LibPyExiv2
 		// image.
 		boost::python::list getAvailableExifTags();
 
+		// Return true if the required EXIF tag is set, false otherwise.
+		bool isExifTagSet(std::string key);
+
 		// Returns a tuple containing the type (as a string) and the value
 		// (as a string as well) of the required EXIF tag, empty strings if
 		// the tag does not exist.
@@ -82,6 +85,9 @@ namespace LibPyExiv2
 		// image.
 		boost::python::list getAvailableIptcTags();
 
+		// Return true if the required IPTC tag is set, false otherwise.
+		bool isIptcTagSet(std::string key);
+
 		// Returns a tuple containing the type (as a string) and the value
 		// (as a string as well) of the required IPTC tag, empty strings if
 		// the tag does not exist.
diff --git a/src/libpyexiv2_wrapper.cpp b/src/libpyexiv2_wrapper.cpp
index aac281b..16c54ea 100644
--- a/src/libpyexiv2_wrapper.cpp
+++ b/src/libpyexiv2_wrapper.cpp
@@ -40,11 +40,13 @@ BOOST_PYTHON_MODULE(libpyexiv2)
 		.def("readMetadata", &Image::readMetadata)
 		.def("writeMetadata", &Image::writeMetadata)
 		.def("getAvailableExifTags", &Image::getAvailableExifTags)
+		.def("isExifTagSet", &Image::isExifTagSet)
 		.def("getExifTag", &Image::getExifTag)
 		.def("getExifTagToString", &Image::getExifTagToString)
 		.def("setExifTag", &Image::setExifTag)
 		.def("deleteExifTag", &Image::deleteExifTag)
 		.def("getAvailableIptcTags", &Image::getAvailableIptcTags)
+		.def("isIptcTagSet", &Image::isIptcTagSet)
 		.def("getIptcTag", &Image::getIptcTag)
 		.def("setIptcTag", &Image::setIptcTag)
 		.def("deleteIptcTag", &Image::deleteIptcTag)