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name : chart.js
 /**
 * Chart type enumerations
 */
var ChartType = {
    LINE : 'line',
    SPLINE : 'spline',
    AREA : 'area',
    BAR : 'bar',
    COLUMN : 'column',
    PIE : 'pie',
    TIMELINE: 'timeline',
    SCATTER: 'scatter'
};

/**
 * Column type enumeration
 */
var ColumnType = {
    STRING : 'string',
    NUMBER : 'number',
    BOOLEAN : 'boolean',
    DATE : 'date'
};

/**
 * Abstract chart factory which defines the contract for chart factories
 */
var ChartFactory = function () {
};
ChartFactory.prototype = {
    createChart : function (type, options) {
        throw new Error('createChart must be implemented by a subclass');
    }
};

/**
 * Abstract chart which defines the contract for charts
 *
 * @param elementId
 *            id of the div element the chart is drawn in
 */
var Chart = function (elementId) {
    this.elementId = elementId;
};
Chart.prototype = {
    draw : function (data, options) {
        throw new Error('draw must be implemented by a subclass');
    },
    redraw : function (options) {
        throw new Error('redraw must be implemented by a subclass');
    },
    destroy : function () {
        throw new Error('destroy must be implemented by a subclass');
    },
    toImageString : function () {
        throw new Error('toImageString must be implemented by a subclass');
    }
};

/**
 * Abstract representation of charts that operates on DataTable where,<br />
 * <ul>
 * <li>First column provides index to the data.</li>
 * <li>Each subsequent columns are of type
 * <code>ColumnType.NUMBER<code> and represents a data series.</li>
 * </ul>
 * Line chart, area chart, bar chart, column chart are typical examples.
 *
 * @param elementId
 *            id of the div element the chart is drawn in
 */
var BaseChart = function (elementId) {
    Chart.call(this, elementId);
};
BaseChart.prototype = new Chart();
BaseChart.prototype.constructor = BaseChart;
BaseChart.prototype.validateColumns = function (dataTable) {
    var columns = dataTable.getColumns();
    if (columns.length < 2) {
        throw new Error('Minimum of two columns are required for this chart');
    }
    for (var i = 1; i < columns.length; i++) {
        if (columns[i].type !== ColumnType.NUMBER) {
            throw new Error('Column ' + (i + 1) + ' should be of type \'Number\'');
        }
    }
    return true;
};

/**
 * Abstract pie chart
 *
 * @param elementId
 *            id of the div element the chart is drawn in
 */
var PieChart = function (elementId) {
    BaseChart.call(this, elementId);
};
PieChart.prototype = new BaseChart();
PieChart.prototype.constructor = PieChart;
PieChart.prototype.validateColumns = function (dataTable) {
    var columns = dataTable.getColumns();
    if (columns.length > 2) {
        throw new Error('Pie charts can draw only one series');
    }
    return BaseChart.prototype.validateColumns.call(this, dataTable);
};

/**
 * Abstract timeline chart
 *
 * @param elementId
 *            id of the div element the chart is drawn in
 */
var TimelineChart = function (elementId) {
    BaseChart.call(this, elementId);
};
TimelineChart.prototype = new BaseChart();
TimelineChart.prototype.constructor = TimelineChart;
TimelineChart.prototype.validateColumns = function (dataTable) {
    var result = BaseChart.prototype.validateColumns.call(this, dataTable);
    if (result) {
        var columns = dataTable.getColumns();
        if (columns[0].type !== ColumnType.DATE) {
            throw new Error('First column of timeline chart need to be a date column');
        }
    }
    return result;
};

/**
 * Abstract scatter chart
 *
 * @param elementId
 *            id of the div element the chart is drawn in
 */
var ScatterChart = function (elementId) {
    BaseChart.call(this, elementId);
};
ScatterChart.prototype = new BaseChart();
ScatterChart.prototype.constructor = ScatterChart;
ScatterChart.prototype.validateColumns = function (dataTable) {
    var result = BaseChart.prototype.validateColumns.call(this, dataTable);
    if (result) {
        var columns = dataTable.getColumns();
        if (columns[0].type !== ColumnType.NUMBER) {
            throw new Error('First column of scatter chart need to be a numeric column');
        }
    }
    return result;
};

/**
 * The data table contains column information and data for the chart.
 */
var DataTable = function () {
    var columns = [];
    var data = null;

    this.addColumn = function (type, name) {
        columns.push({
            'type' : type,
            'name' : name
        });
    };

    this.getColumns = function () {
        return columns;
    };

    this.setData = function (rows) {
        data = rows;
        fillMissingValues();
    };

    this.getData = function () {
        return data;
    };

    var fillMissingValues = function () {
        if (columns.length === 0) {
            throw new Error('Set columns first');
        }
        var row;
        for (var i = 0; i < data.length; i++) {
            row = data[i];
            if (row.length > columns.length) {
                row.splice(columns.length - 1, row.length - columns.length);
            } else if (row.length < columns.length) {
                for (var j = row.length; j < columns.length; j++) {
                    row.push(null);
                }
            }
        }
    };
};

/** *****************************************************************************
 * JQPlot specific code
 ******************************************************************************/

/**
 * Abstract JQplot chart
 *
 * @param elementId
 *            id of the div element the chart is drawn in
 */
var JQPlotChart = function (elementId) {
    Chart.call(this, elementId);
    this.plot = null;
    this.validator = null;
};
JQPlotChart.prototype = new Chart();
JQPlotChart.prototype.constructor = JQPlotChart;
JQPlotChart.prototype.draw = function (data, options) {
    if (this.validator.validateColumns(data)) {
        this.plot = $.jqplot(this.elementId, this.prepareData(data), this
            .populateOptions(data, options));
    }
};
JQPlotChart.prototype.destroy = function () {
    if (this.plot !== null) {
        this.plot.destroy();
    }
};
JQPlotChart.prototype.redraw = function (options) {
    if (this.plot !== null) {
        this.plot.replot(options);
    }
};
JQPlotChart.prototype.toImageString = function (options) {
    if (this.plot !== null) {
        return $('#' + this.elementId).jqplotToImageStr({});
    }
};
JQPlotChart.prototype.populateOptions = function (dataTable, options) {
    throw new Error('populateOptions must be implemented by a subclass');
};
JQPlotChart.prototype.prepareData = function (dataTable) {
    throw new Error('prepareData must be implemented by a subclass');
};

/**
 * JQPlot line chart
 *
 * @param elementId
 *            id of the div element the chart is drawn in
 */
var JQPlotLineChart = function (elementId) {
    JQPlotChart.call(this, elementId);
    this.validator = BaseChart.prototype;
};
JQPlotLineChart.prototype = new JQPlotChart();
JQPlotLineChart.prototype.constructor = JQPlotLineChart;

JQPlotLineChart.prototype.populateOptions = function (dataTable, options) {
    var columns = dataTable.getColumns();
    var optional = {
        axes : {
            xaxis : {
                label : columns[0].name,
                renderer : $.jqplot.CategoryAxisRenderer,
                ticks : []
            },
            yaxis : {
                label : (columns.length === 2 ? columns[1].name : 'Values'),
                labelRenderer : $.jqplot.CanvasAxisLabelRenderer
            }
        },
        highlighter: {
            show: true,
            tooltipAxes: 'y',
            formatString:'%d'
        },
        series : []
    };
    $.extend(true, optional, options);

    if (optional.series.length === 0) {
        for (var i = 1; i < columns.length; i++) {
            optional.series.push({
                label : columns[i].name.toString()
            });
        }
    }
    if (optional.axes.xaxis.ticks.length === 0) {
        var data = dataTable.getData();
        for (var j = 0; j < data.length; j++) {
            optional.axes.xaxis.ticks.push(data[j][0].toString());
        }
    }
    return optional;
};

JQPlotLineChart.prototype.prepareData = function (dataTable) {
    var data = dataTable.getData();
    var row;
    var retData = [];
    var retRow;
    for (var i = 0; i < data.length; i++) {
        row = data[i];
        for (var j = 1; j < row.length; j++) {
            retRow = retData[j - 1];
            if (retRow === undefined) {
                retRow = [];
                retData[j - 1] = retRow;
            }
            retRow.push(row[j]);
        }
    }
    return retData;
};

/**
 * JQPlot spline chart
 *
 * @param elementId
 *            id of the div element the chart is drawn in
 */
var JQPlotSplineChart = function (elementId) {
    JQPlotLineChart.call(this, elementId);
};
JQPlotSplineChart.prototype = new JQPlotLineChart();
JQPlotSplineChart.prototype.constructor = JQPlotSplineChart;

JQPlotSplineChart.prototype.populateOptions = function (dataTable, options) {
    var optional = {};
    var opt = JQPlotLineChart.prototype.populateOptions.call(this, dataTable,
        options);
    var compulsory = {
        seriesDefaults : {
            rendererOptions : {
                smooth : true
            }
        }
    };
    $.extend(true, optional, opt, compulsory);
    return optional;
};

/**
 * JQPlot scatter chart
 *
 * @param elementId
 *            id of the div element the chart is drawn in
 */
var JQPlotScatterChart = function (elementId) {
    JQPlotChart.call(this, elementId);
    this.validator = ScatterChart.prototype;
};
JQPlotScatterChart.prototype = new JQPlotChart();
JQPlotScatterChart.prototype.constructor = JQPlotScatterChart;

JQPlotScatterChart.prototype.populateOptions = function (dataTable, options) {
    var columns = dataTable.getColumns();
    var optional = {
        axes : {
            xaxis : {
                label : columns[0].name
            },
            yaxis : {
                label : (columns.length === 2 ? columns[1].name : 'Values'),
                labelRenderer : $.jqplot.CanvasAxisLabelRenderer
            }
        },
        highlighter: {
            show: true,
            tooltipAxes: 'xy',
            formatString:'%d, %d'
        },
        series : []
    };
    for (var i = 1; i < columns.length; i++) {
        optional.series.push({
            label : columns[i].name.toString()
        });
    }

    var compulsory = {
        seriesDefaults : {
            showLine: false,
            markerOptions: {
                size: 7,
                style: 'x'
            }
        }
    };

    $.extend(true, optional, options, compulsory);
    return optional;
};

JQPlotScatterChart.prototype.prepareData = function (dataTable) {
    var data = dataTable.getData();
    var row;
    var retData = [];
    var retRow;
    for (var i = 0; i < data.length; i++) {
        row = data[i];
        if (row[0]) {
            for (var j = 1; j < row.length; j++) {
                retRow = retData[j - 1];
                if (retRow === undefined) {
                    retRow = [];
                    retData[j - 1] = retRow;
                }
                retRow.push([row[0], row[j]]);
            }
        }
    }
    return retData;
};

/**
 * JQPlot timeline chart
 *
 * @param elementId
 *            id of the div element the chart is drawn in
 */
var JQPlotTimelineChart = function (elementId) {
    JQPlotLineChart.call(this, elementId);
    this.validator = TimelineChart.prototype;
};
JQPlotTimelineChart.prototype = new JQPlotLineChart();
JQPlotTimelineChart.prototype.constructor = JQPlotTimelineChart;

JQPlotTimelineChart.prototype.populateOptions = function (dataTable, options) {
    var optional = {
        axes : {
            xaxis : {
                tickOptions : {
                    formatString: '%b %#d, %y'
                }
            }
        }
    };
    var opt = JQPlotLineChart.prototype.populateOptions.call(this, dataTable, options);
    var compulsory = {
        axes : {
            xaxis : {
                renderer : $.jqplot.DateAxisRenderer
            }
        }
    };
    $.extend(true, optional, opt, compulsory);
    return optional;
};

JQPlotTimelineChart.prototype.prepareData = function (dataTable) {
    var data = dataTable.getData();
    var row;
    var d;
    var retData = [];
    var retRow;
    for (var i = 0; i < data.length; i++) {
        row = data[i];
        d = row[0];
        for (var j = 1; j < row.length; j++) {
            retRow = retData[j - 1];
            if (retRow === undefined) {
                retRow = [];
                retData[j - 1] = retRow;
            }
            if (d !== null) {
                retRow.push([d.getTime(), row[j]]);
            }
        }
    }
    return retData;
};

/**
 * JQPlot area chart
 *
 * @param elementId
 *            id of the div element the chart is drawn in
 */
var JQPlotAreaChart = function (elementId) {
    JQPlotLineChart.call(this, elementId);
};
JQPlotAreaChart.prototype = new JQPlotLineChart();
JQPlotAreaChart.prototype.constructor = JQPlotAreaChart;

JQPlotAreaChart.prototype.populateOptions = function (dataTable, options) {
    var optional = {
        seriesDefaults : {
            fillToZero : true
        }
    };
    var opt = JQPlotLineChart.prototype.populateOptions.call(this, dataTable,
        options);
    var compulsory = {
        seriesDefaults : {
            fill : true
        }
    };
    $.extend(true, optional, opt, compulsory);
    return optional;
};

/**
 * JQPlot column chart
 *
 * @param elementId
 *            id of the div element the chart is drawn in
 */
var JQPlotColumnChart = function (elementId) {
    JQPlotLineChart.call(this, elementId);
};
JQPlotColumnChart.prototype = new JQPlotLineChart();
JQPlotColumnChart.prototype.constructor = JQPlotColumnChart;

JQPlotColumnChart.prototype.populateOptions = function (dataTable, options) {
    var optional = {
        seriesDefaults : {
            fillToZero : true
        }
    };
    var opt = JQPlotLineChart.prototype.populateOptions.call(this, dataTable,
        options);
    var compulsory = {
        seriesDefaults : {
            renderer : $.jqplot.BarRenderer
        }
    };
    $.extend(true, optional, opt, compulsory);
    return optional;
};

/**
 * JQPlot bar chart
 *
 * @param elementId
 *            id of the div element the chart is drawn in
 */
var JQPlotBarChart = function (elementId) {
    JQPlotLineChart.call(this, elementId);
};
JQPlotBarChart.prototype = new JQPlotLineChart();
JQPlotBarChart.prototype.constructor = JQPlotBarChart;

JQPlotBarChart.prototype.populateOptions = function (dataTable, options) {
    var columns = dataTable.getColumns();
    var optional = {
        axes : {
            yaxis : {
                label : columns[0].name,
                labelRenderer : $.jqplot.CanvasAxisLabelRenderer,
                renderer : $.jqplot.CategoryAxisRenderer,
                ticks : []
            },
            xaxis : {
                label : (columns.length === 2 ? columns[1].name : 'Values'),
                labelRenderer : $.jqplot.CanvasAxisLabelRenderer
            }
        },
        highlighter: {
            show: true,
            tooltipAxes: 'x',
            formatString:'%d'
        },
        series : [],
        seriesDefaults : {
            fillToZero : true
        }
    };
    var compulsory = {
        seriesDefaults : {
            renderer : $.jqplot.BarRenderer,
            rendererOptions : {
                barDirection : 'horizontal'
            }
        }
    };
    $.extend(true, optional, options, compulsory);

    if (optional.axes.yaxis.ticks.length === 0) {
        var data = dataTable.getData();
        for (var i = 0; i < data.length; i++) {
            optional.axes.yaxis.ticks.push(data[i][0].toString());
        }
    }
    if (optional.series.length === 0) {
        for (var j = 1; j < columns.length; j++) {
            optional.series.push({
                label : columns[j].name.toString()
            });
        }
    }
    return optional;
};

/**
 * JQPlot pie chart
 *
 * @param elementId
 *            id of the div element the chart is drawn in
 */
var JQPlotPieChart = function (elementId) {
    JQPlotChart.call(this, elementId);
    this.validator = PieChart.prototype;
};
JQPlotPieChart.prototype = new JQPlotChart();
JQPlotPieChart.prototype.constructor = JQPlotPieChart;

JQPlotPieChart.prototype.populateOptions = function (dataTable, options) {
    var optional = {
        highlighter: {
            show: true,
            tooltipAxes: 'xy',
            formatString:'%s, %d',
            useAxesFormatters: false
        },
        legend: {
            renderer: $.jqplot.EnhancedPieLegendRenderer,
        },
    };
    var compulsory = {
        seriesDefaults : {
            shadow: false,
            renderer : $.jqplot.PieRenderer,
            rendererOptions: { sliceMargin: 1, showDataLabels: true }
        }
    };
    $.extend(true, optional, options, compulsory);
    return optional;
};

JQPlotPieChart.prototype.prepareData = function (dataTable) {
    var data = dataTable.getData();
    var row;
    var retData = [];
    for (var i = 0; i < data.length; i++) {
        row = data[i];
        retData.push([row[0], row[1]]);
    }
    return [retData];
};

/**
 * Chart factory that returns JQPlotCharts
 */
var JQPlotChartFactory = function () {
};
JQPlotChartFactory.prototype = new ChartFactory();
JQPlotChartFactory.prototype.createChart = function (type, elementId) {
    var chart = null;
    switch (type) {
    case ChartType.LINE:
        chart = new JQPlotLineChart(elementId);
        break;
    case ChartType.SPLINE:
        chart = new JQPlotSplineChart(elementId);
        break;
    case ChartType.TIMELINE:
        chart = new JQPlotTimelineChart(elementId);
        break;
    case ChartType.AREA:
        chart = new JQPlotAreaChart(elementId);
        break;
    case ChartType.BAR:
        chart = new JQPlotBarChart(elementId);
        break;
    case ChartType.COLUMN:
        chart = new JQPlotColumnChart(elementId);
        break;
    case ChartType.PIE:
        chart = new JQPlotPieChart(elementId);
        break;
    case ChartType.SCATTER:
        chart = new JQPlotScatterChart(elementId);
        break;
    }

    return chart;
};