function saveHandler()

in archived/SimpleImaging/js/js/scenario1.js [296:403]
79 lines of code
24 McCabe index (conditional complexity)

    function saveHandler() {
        WinJS.log && WinJS.log("Updating properties...", "sample", "status");

        ImageProperties.title = id("propertiesTitle").value;

        // Keywords are stored as an array of strings. Split the textarea text by newlines.
        ImageProperties.keywords.clear();
        if (id("propertiesKeywords").value !== "") {
            var keywordsArray = id("propertiesKeywords").value.split("\n");

            keywordsArray.forEach(function (keyword) {
                ImageProperties.keywords.append(keyword);
            });
        }

        var properties = new Windows.Foundation.Collections.PropertySet();

        // When writing the rating, use the "System.Rating" property key.
        // ImageProperties.rating does not handle setting the value to 0 (no stars/unrated).
        properties["System.Rating"] = Helpers.convertStarsToSystemRating(
            id("propertiesRating").selectedIndex
            );

        var gpsWriteFailed = false;
        var latitude = [
            parseInt(id("propertiesLatDeg").value),
            parseInt(id("propertiesLatMin").value),
            parseFloat(id("propertiesLatSec").value)
        ];

        var longitude = [
            parseInt(id("propertiesLongDeg").value),
            parseInt(id("propertiesLongMin").value),
            parseFloat(id("propertiesLongSec").value)
        ];

        var latitudeRef = id("propertiesLatRef").value.toUpperCase();
        var longitudeRef = id("propertiesLongRef").value.toUpperCase();

        // Perform some simple validation on the GPS data before storing the values.
        if ((latitude[0] >= 0 && latitude[0] <= 90) &&
            (latitude[1] >= 0 && latitude[1] <= 60) &&
            (latitude[2] >= 0 && latitude[2] <= 60) &&
            (latitudeRef === "N" || latitudeRef === "S") &&
            (longitude[0] >= 0 && longitude[0] <= 180) &&
            (latitude[1] >= 0 && longitude[1] <= 60) &&
            (longitude[2] >= 0 && longitude[2] <= 60) &&
            (longitudeRef === "E" || longitudeRef === "W")) {
            properties["System.GPS.LatitudeRef"] = latitudeRef;
            properties["System.GPS.LongitudeRef"] = longitudeRef;

            // The Latitude and Longitude properties are read-only. Instead,
            // write to System.GPS.LatitudeNumerator, LatitudeDenominator, etc.
            // These are length 3 arrays of integers. For simplicity, the
            // seconds data is rounded to the nearest 10000th.
            var latNum = new Uint32Array([
                latitude[0],
                latitude[1],
                parseInt(latitude[2] * 10000)
            ]);

            var longNum = new Uint32Array([
                longitude[0],
                longitude[1],
                parseInt(longitude[2] * 10000)
            ]);

            var latDen = new Uint32Array([1, 1, 10000]);
            var longDen = new Uint32Array([1, 1, 10000]);

            properties["System.GPS.LatitudeNumerator"] = latNum;
            properties["System.GPS.LongitudeNumerator"] = longNum;
            properties["System.GPS.LatitudeDenominator"] = latDen;
            properties["System.GPS.LongitudeDenominator"] = longDen;
        } else {
            gpsWriteFailed = true;
        }

        ImageProperties.savePropertiesAsync(properties).done(function () {
            WinJS.log && WinJS.log(
                gpsWriteFailed ? "GPS data invalid; other properties successfully updated" :
                    "All properties successfully updated",
                "sample",
                "status"
                );

        }, function (error) {
            switch (error.number) {
                case E_INVALIDARG:
                    // Some imaging formats, such as PNG and BMP, do not support Windows properties.
                    // Other formats do not support all Windows properties.
                    // For example, JPEG does not support System.FlagStatus.
                    WinJS.log && WinJS.log(
                        "Error: One or more properties may not be supported by this file format.",
                        "sample",
                        "error"
                        );

                    break;

                default:
                    WinJS.log && WinJS.log("Failed to update properties: " + error.message, "sample", "error");
                    break;
            }

            resetSessionState();
        });
    }