Java ParamChecks类代码示例

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Calculates the total of all the values in a {@link PieDataset}.  If
 * the dataset contains negative or <code>null</code> values, they are
 * ignored.
 *
 * @param dataset  the dataset (<code>null</code> not permitted).
 *
 * @return The total.
 */
public static double calculatePieDatasetTotal(PieDataset dataset) {
    ParamChecks.nullNotPermitted(dataset, "dataset");
    List keys = dataset.getKeys();
    double totalValue = 0;
    Iterator iterator = keys.iterator();
    while (iterator.hasNext()) {
        Comparable current = (Comparable) iterator.next();
        if (current != null) {
            Number value = dataset.getValue(current);
            double v = 0.0;
            if (value != null) {
                v = value.doubleValue();
            }
            if (v > 0) {
                totalValue = totalValue + v;
            }
        }
    }
    return totalValue;
}
 

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Removes a subplot from the combined chart and sends a
 * {@link PlotChangeEvent} to all registered listeners.
 *
 * @param subplot  the subplot (<code>null</code> not permitted).
 */
public void remove(XYPlot subplot) {
    ParamChecks.nullNotPermitted(subplot, "subplot");
    int position = -1;
    int size = this.subplots.size();
    int i = 0;
    while (position == -1 && i < size) {
        if (this.subplots.get(i) == subplot) {
            position = i;
        }
        i++;
    }
    if (position != -1) {
        this.subplots.remove(position);
        subplot.setParent(null);
        subplot.removeChangeListener(this);
        ValueAxis domain = getDomainAxis();
        if (domain != null) {
            domain.configure();
        }
        fireChangeEvent();
    }
}
 

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Removes a marker for a specific dataset/renderer and sends a
 * {@link PlotChangeEvent} to all registered listeners.
 *
 * @param index  the dataset/renderer index.
 * @param marker  the marker.
 * @param layer  the layer (foreground or background).
 * @param notify  notify listeners.
 *
 * @return A boolean indicating whether or not the marker was actually
 *         removed.
 *
 * @since 1.0.10
 *
 * @see #addRangeMarker(int, Marker, Layer, boolean)
 */
public boolean removeRangeMarker(int index, Marker marker, Layer layer,
        boolean notify) {
    ParamChecks.nullNotPermitted(marker, "marker");
    ArrayList markers;
    if (layer == Layer.FOREGROUND) {
        markers = (ArrayList) this.foregroundRangeMarkers.get(new Integer(
                index));
    } else {
        markers = (ArrayList) this.backgroundRangeMarkers.get(new Integer(
                index));
    }
    if (markers == null) {
        return false;
    }
    boolean removed = markers.remove(marker);
    if (removed && notify) {
        fireChangeEvent();
    }
    return removed;
}
 

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Creates a line chart (based on an {@link XYDataset}) with default
 * settings.
 *
 * @param title  the chart title (<code>null</code> permitted).
 * @param xAxisLabel  a label for the X-axis (<code>null</code> permitted).
 * @param yAxisLabel  a label for the Y-axis (<code>null</code> permitted).
 * @param dataset  the dataset for the chart (<code>null</code> permitted).
 * @param orientation  the plot orientation (horizontal or vertical)
 *                     (<code>null</code> NOT permitted).
 * @param legend  a flag specifying whether or not a legend is required.
 * @param tooltips  configure chart to generate tool tips?
 * @param urls  configure chart to generate URLs?
 *
 * @return The chart.
 */
public static JFreeChart createXYLineChart(String title, String xAxisLabel,
        String yAxisLabel, XYDataset dataset, PlotOrientation orientation,
        boolean legend, boolean tooltips, boolean urls) {

    ParamChecks.nullNotPermitted(orientation, "orientation");
    NumberAxis xAxis = new NumberAxis(xAxisLabel);
    xAxis.setAutoRangeIncludesZero(false);
    NumberAxis yAxis = new NumberAxis(yAxisLabel);
    XYItemRenderer renderer = new XYLineAndShapeRenderer(true, false);
    XYPlot plot = new XYPlot(dataset, xAxis, yAxis, renderer);
    plot.setOrientation(orientation);
    if (tooltips) {
        renderer.setBaseToolTipGenerator(new StandardXYToolTipGenerator());
    }
    if (urls) {
        renderer.setURLGenerator(new StandardXYURLGenerator());
    }

    JFreeChart chart = new JFreeChart(title, JFreeChart.DEFAULT_TITLE_FONT,
            plot, legend);
    currentTheme.apply(chart);
    return chart;

}
 

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Creates a new annotation that draws a line between (category1, value1)
 * and (category2, value2).
 *
 * @param category1  the category (<code>null</code> not permitted).
 * @param value1  the value.
 * @param category2  the category (<code>null</code> not permitted).
 * @param value2  the value.
 * @param paint  the line color (<code>null</code> not permitted).
 * @param stroke  the line stroke (<code>null</code> not permitted).
 */
public CategoryLineAnnotation(Comparable category1, double value1,
                              Comparable category2, double value2,
                              Paint paint, Stroke stroke) {
    super();
    ParamChecks.nullNotPermitted(category1, "category1");
    ParamChecks.nullNotPermitted(category2, "category2");
    ParamChecks.nullNotPermitted(paint, "paint");
    ParamChecks.nullNotPermitted(stroke, "stroke");
    this.category1 = category1;
    this.value1 = value1;
    this.category2 = category2;
    this.value2 = value2;
    this.paint = paint;
    this.stroke = stroke;
}
 

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Creates a label generator with the specified date formatter.
 *
 * @param labelFormat  the label format string (<code>null</code> not
 *                     permitted).
 * @param formatter  the date formatter (<code>null</code> not permitted).
 */
protected AbstractCategoryItemLabelGenerator(String labelFormat,
        DateFormat formatter) {
    ParamChecks.nullNotPermitted(labelFormat, "labelFormat");
    ParamChecks.nullNotPermitted(formatter, "formatter");
    this.labelFormat = labelFormat;
    this.numberFormat = null;
    this.percentFormat = NumberFormat.getPercentInstance();
    this.dateFormat = formatter;
    this.nullValueString = "-";
}
 

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Calculates the range of values for a dataset where each item is the
 * running total of the items for the current series.
 *
 * @param dataset  the dataset (<code>null</code> not permitted).
 *
 * @return The range.
 *
 * @see #findRangeBounds(CategoryDataset)
 */
public static Range findCumulativeRangeBounds(CategoryDataset dataset) {
    ParamChecks.nullNotPermitted(dataset, "dataset");
    boolean allItemsNull = true; // we'll set this to false if there is at
                                 // least one non-null data item...
    double minimum = 0.0;
    double maximum = 0.0;
    for (int row = 0; row < dataset.getRowCount(); row++) {
        double runningTotal = 0.0;
        for (int column = 0; column <= dataset.getColumnCount() - 1;
             column++) {
            Number n = dataset.getValue(row, column);
            if (n != null) {
                allItemsNull = false;
                double value = n.doubleValue();
                if (!Double.isNaN(value)) {
                    runningTotal = runningTotal + value;
                    minimum = Math.min(minimum, runningTotal);
                    maximum = Math.max(maximum, runningTotal);
                }
            }
        }
    }
    if (!allItemsNull) {
        return new Range(minimum, maximum);
    }
    else {
        return null;
    }
}
 

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Creates a new {@link XYDataset} containing the moving averages of each
 * series in the <code>source</code> dataset.
 *
 * @param source  the source dataset.
 * @param suffix  the string to append to source series names to create
 *                target series names.
 * @param period  the averaging period.
 * @param skip  the length of the initial skip period.
 *
 * @return The dataset.
 */
public static XYDataset createMovingAverage(XYDataset source,
        String suffix, double period, double skip) {

    ParamChecks.nullNotPermitted(source, "source");
    XYSeriesCollection result = new XYSeriesCollection();
    for (int i = 0; i < source.getSeriesCount(); i++) {
        XYSeries s = createMovingAverage(source, i, source.getSeriesKey(i)
                + suffix, period, skip);
        result.addSeries(s);
    }
    return result;
}
 

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Sets the last time period in the axis range and sends an
 * {@link AxisChangeEvent} to all registered listeners.
 *
 * @param last  the time period (<code>null</code> not permitted).
 */
public void setLast(RegularTimePeriod last) {
    ParamChecks.nullNotPermitted(last, "last");
    this.last = last;
    this.last.peg(this.calendar);
    fireChangeEvent();
}
 

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Adds a data item to the series and sends a {@link SeriesChangeEvent} to
 * all registered listeners.
 *
 * @param item  the item (<code>null</code> not permitted).
 */
public void add(TimePeriodValue item) {
    ParamChecks.nullNotPermitted(item, "item");
    this.data.add(item);
    updateBounds(item.getPeriod(), this.data.size() - 1);
    fireSeriesChanged();
}
 

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Sets the maximum date visible on the axis and sends an
 * {@link AxisChangeEvent} to all registered listeners.  If
 * <code>maximumDate</code> is on or before the current minimum date for
 * the axis, the minimum date will be shifted to preserve the current
 * length of the axis.
 *
 * @param maximumDate  the date (<code>null</code> not permitted).
 *
 * @see #getMinimumDate()
 * @see #setMinimumDate(Date)
 */
public void setMaximumDate(Date maximumDate) {
    ParamChecks.nullNotPermitted(maximumDate, "maximumDate");
    // check the new maximum date relative to the current minimum date
    Date minDate = getMinimumDate();
    long minMillis = minDate.getTime();
    long newMaxMillis = maximumDate.getTime();
    if (minMillis >= newMaxMillis) {
        Date oldMax = getMaximumDate();
        long length = oldMax.getTime() - minMillis;
        minDate = new Date(newMaxMillis - length);
    }
    setRange(new DateRange(minDate, maximumDate), true, false);
    fireChangeEvent();
}
 

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Returns the subplot (if any) that contains the (x, y) point (specified
 * in Java2D space).
 *
 * @param info  the chart rendering info (<code>null</code> not permitted).
 * @param source  the source point (<code>null</code> not permitted).
 *
 * @return A subplot (possibly <code>null</code>).
 */
public XYPlot findSubplot(PlotRenderingInfo info, Point2D source) {
    ParamChecks.nullNotPermitted(info, "info");
    ParamChecks.nullNotPermitted(source, "source");
    XYPlot result = null;
    int subplotIndex = info.getSubplotIndex(source);
    if (subplotIndex >= 0) {
        result =  (XYPlot) this.subplots.get(subplotIndex);
    }
    return result;
}
 

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Finds the slope of a regression line using least squares.
 *
 * @param xData  the x-values ({@code null} not permitted).
 * @param yData  the y-values ({@code null} not permitted).
 *
 * @return The slope.
 */
public static double getSlope(Number[] xData, Number[] yData) {
    ParamChecks.nullNotPermitted(xData, "xData");
    ParamChecks.nullNotPermitted(yData, "yData");
    if (xData.length != yData.length) {
        throw new IllegalArgumentException("Array lengths must be equal.");
    }

    // ********* stat function for linear slope ********
    // y = a + bx
    // a = ybar - b * xbar
    //     sum(x * y) - (sum (x) * sum(y)) / n
    // b = ------------------------------------
    //     sum (x^2) - (sum(x)^2 / n
    // *************************************************

    // sum of x, x^2, x * y, y
    double sx = 0.0, sxx = 0.0, sxy = 0.0, sy = 0.0;
    int counter;
    for (counter = 0; counter < xData.length; counter++) {
        sx = sx + xData[counter].doubleValue();
        sxx = sxx + Math.pow(xData[counter].doubleValue(), 2);
        sxy = sxy + yData[counter].doubleValue()
                  * xData[counter].doubleValue();
        sy = sy + yData[counter].doubleValue();
    }
    return (sxy - (sx * sy) / counter) / (sxx - (sx * sx) / counter);

}
 

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Creates a new spider web plot with the given dataset.
 *
 * @param dataset  the dataset.
 * @param extract  controls how data is extracted ({@link TableOrder#BY_ROW}
 *                 or {@link TableOrder#BY_COLUMN}).
 */
public SpiderWebPlot(CategoryDataset dataset, TableOrder extract) {
    super();
    ParamChecks.nullNotPermitted(extract, "extract");
    this.dataset = dataset;
    if (dataset != null) {
        dataset.addChangeListener(this);
    }

    this.dataExtractOrder = extract;
    this.headPercent = DEFAULT_HEAD;
    this.axisLabelGap = DEFAULT_AXIS_LABEL_GAP;
    this.axisLinePaint = Color.black;
    this.axisLineStroke = new BasicStroke(1.0f);

    this.interiorGap = DEFAULT_INTERIOR_GAP;
    this.startAngle = DEFAULT_START_ANGLE;
    this.direction = Rotation.CLOCKWISE;
    this.maxValue = DEFAULT_MAX_VALUE;

    this.seriesPaint = null;
    this.seriesPaintList = new PaintList();
    this.baseSeriesPaint = null;

    this.seriesOutlinePaint = null;
    this.seriesOutlinePaintList = new PaintList();
    this.baseSeriesOutlinePaint = DEFAULT_OUTLINE_PAINT;

    this.seriesOutlineStroke = null;
    this.seriesOutlineStrokeList = new StrokeList();
    this.baseSeriesOutlineStroke = DEFAULT_OUTLINE_STROKE;

    this.labelFont = DEFAULT_LABEL_FONT;
    this.labelPaint = DEFAULT_LABEL_PAINT;
    this.labelGenerator = new StandardCategoryItemLabelGenerator();

    this.legendItemShape = DEFAULT_LEGEND_ITEM_CIRCLE;
}
 

import org.jfree.chart.util.ParamChecks; //导入依赖的package包/类
/**
 * Sets the vertical alignment for the title, and notifies any registered
 * listeners of the change.
 *
 * @param alignment  the new vertical alignment (TOP, MIDDLE or BOTTOM,
 *                   <code>null</code> not permitted).
 */
public void setVerticalAlignment(VerticalAlignment alignment) {
    ParamChecks.nullNotPermitted(alignment, "alignment");
    if (this.verticalAlignment != alignment) {
        this.verticalAlignment = alignment;
        notifyListeners(new TitleChangeEvent(this));
    }
}