Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/exports/ChartGenerator.java @ 2236:c2b15d9c0f43
Refactoring: moved more base code from XYChartGenerator into its parent class ChartGenerator
flys-artifacts/trunk@3883 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Thu, 02 Feb 2012 14:00:40 +0000 |
parents | 46ec09c7f578 |
children | 23c7c51df772 |
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package de.intevation.flys.exports; import java.awt.Color; import java.awt.Font; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; import java.util.Locale; import javax.xml.xpath.XPathConstants; import org.apache.log4j.Logger; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.jfree.chart.JFreeChart; import org.jfree.chart.LegendItem; import org.jfree.chart.axis.NumberAxis; import org.jfree.data.Range; import de.intevation.artifacts.Artifact; import de.intevation.artifacts.CallContext; import de.intevation.artifacts.CallMeta; import de.intevation.artifacts.PreferredLocale; import de.intevation.artifacts.ArtifactNamespaceContext; import de.intevation.artifacts.common.utils.XMLUtils; import de.intevation.artifactdatabase.state.ArtifactAndFacet; import de.intevation.artifactdatabase.state.Settings; import de.intevation.flys.model.River; import de.intevation.flys.artifacts.FLYSArtifact; import de.intevation.flys.artifacts.resources.Resources; import de.intevation.flys.utils.FLYSUtils; import de.intevation.flys.utils.ThemeAccess; /** * The base class for chart creation. It should provide some basic things that * equal in all chart types. * * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> */ public abstract class ChartGenerator implements OutGenerator { private static Logger logger = Logger.getLogger(ChartGenerator.class); public static final int DEFAULT_CHART_WIDTH = 600; public static final int DEFAULT_CHART_HEIGHT = 400; public static final String DEFAULT_CHART_FORMAT = "png"; public static final Color DEFAULT_GRID_COLOR = Color.GRAY; public static final float DEFAULT_GRID_LINE_WIDTH = 0.3f; public static final int DEFAULT_FONT_SIZE = 12; public static final String DEFAULT_FONT_NAME = "Tahoma"; public static final String XPATH_CHART_SIZE = "/art:action/art:attributes/art:size"; public static final String XPATH_CHART_FORMAT = "/art:action/art:attributes/art:format/@art:value"; public static final String XPATH_CHART_X_RANGE = "/art:action/art:attributes/art:xrange"; public static final String XPATH_CHART_Y_RANGE = "/art:action/art:attributes/art:yrange"; /** The document of the incoming out() request.*/ protected Document request; /** The output stream where the data should be written to.*/ protected OutputStream out; /** The CallContext object.*/ protected CallContext context; /** The artifact that is used to decorate the chart with meta information.*/ protected Artifact master; /** The settings that should be used during output creation.*/ protected Settings settings; /** * A mini interface that allows to walk over the YAXIS enums defined in * subclasses. */ public interface YAxisWalker { int length(); String getId(int idx); } /** * This method needs to be implemented by concrete subclasses to create new * instances of JFreeChart. * * @return a new instance of a JFreeChart. */ public abstract JFreeChart generateChart(); public abstract void doOut( ArtifactAndFacet bundle, Document attr, boolean visible); protected abstract YAxisWalker getYAxisWalker(); /** * Returns the default title of a chart. * * @return the default title of a chart. */ protected abstract String getDefaultChartTitle(); /** * Returns the default X-Axis label of a chart. * * @return the default X-Axis label of a chart. */ protected abstract String getDefaultXAxisLabel(); /** * This method is called to retrieve the default label for an Y axis at * position <i>pos</i>. * * @param pos The position of an Y axis. * * @return the default Y axis label at position <i>pos</i>. */ protected abstract String getDefaultYAxisLabel(int pos); /** * This method should be used by concrete subclasses to add subtitle to * <i>chart</i>. <b>The method in this implementation is empty</b>. * * @param chart The JFreeChart chart object. */ protected void addSubtitles(JFreeChart chart) { // do nothing } /** * Generate chart. */ @Override public void generate() throws IOException { logger.debug("ChartGenerator.generate"); JFreeChart chart = generateChart(); String format = getFormat(); int[] size = getSize(); if (size == null) { size = getExportDimension(); } context.putContextValue("chart.width", size[0]); context.putContextValue("chart.height", size[1]); if (format.equals(ChartExportHelper.FORMAT_PNG)) { context.putContextValue("chart.image.format", "png"); ChartExportHelper.exportImage( out, chart, context); } else if (format.equals(ChartExportHelper.FORMAT_PDF)) { preparePDFContext(context); ChartExportHelper.exportPDF( out, chart, context); } else if (format.equals(ChartExportHelper.FORMAT_SVG)) { prepareSVGContext(context); ChartExportHelper.exportSVG( out, chart, context); } else if (format.equals(ChartExportHelper.FORMAT_CSV)) { context.putContextValue("chart.image.format", "csv"); ChartExportHelper.exportCSV( out, chart, context); } } @Override public void init(Document request, OutputStream out, CallContext context) { logger.debug("ChartGenerator.init"); this.request = request; this.out = out; this.context = context; } @Override public void setMasterArtifact(Artifact master) { this.master = master; } @Override public void setSettings(Settings settings) { this.settings = settings; } /** * Returns an instance of <i>ChartSettings</i> with a chart specific section * but with no axes settings. * * @return an instance of <i>ChartSettings</i>. */ @Override public Settings getSettings() { if (this.settings != null) { return this.settings; } ChartSettings settings = new ChartSettings(); ChartSection chartSection = buildChartSection(); LegendSection legendSection = buildLegendSection(); ExportSection exportSection = buildExportSection(); settings.setChartSection(chartSection); settings.setLegendSection(legendSection); settings.setExportSection(exportSection); List<AxisSection> axisSections = buildAxisSections(); for (AxisSection axisSection: axisSections) { settings.addAxisSection(axisSection); } return settings; } /** * Creates a new <i>ChartSection</i>. * * @return a new <i>ChartSection</i>. */ protected ChartSection buildChartSection() { ChartSection chartSection = new ChartSection(); chartSection.setTitle(getChartTitle()); chartSection.setSubtitle(getChartSubtitle()); chartSection.setDisplayGird(isGridVisible()); return chartSection; } /** * Creates a new <i>LegendSection</i>. * * @return a new <i>LegendSection</i>. */ protected LegendSection buildLegendSection() { LegendSection legendSection = new LegendSection(); legendSection.setVisibility(isLegendVisible()); legendSection.setFontSize(getLegendFontSize()); return legendSection; } /** * Creates a new <i>ExportSection</i> with default values <b>WIDTH=600</b> * and <b>HEIGHT=400</b>. * * @return a new <i>ExportSection</i>. */ protected ExportSection buildExportSection() { ExportSection exportSection = new ExportSection(); exportSection.setWidth(600); exportSection.setHeight(400); return exportSection; } /** * Creates a list of Sections that contains all axes of the chart (including * X and Y axes). * * @return a list of Sections for each axis in this chart. */ protected List<AxisSection> buildAxisSections() { List<AxisSection> axisSections = new ArrayList<AxisSection>(); axisSections.addAll(buildXAxisSections()); axisSections.addAll(buildYAxisSections()); return axisSections; } /** * Creates a new Section for chart's X axis. * * @return a List that contains a Section for the X axis. */ protected List<AxisSection> buildXAxisSections() { List<AxisSection> axisSections = new ArrayList<AxisSection>(); String identifier = "X"; AxisSection axisSection = new AxisSection(); axisSection.setIdentifier(identifier); axisSection.setLabel(getXAxisLabel()); axisSection.setFontSize(14); axisSection.setFixed(false); // XXX We are able to find better default ranges that [0,0], but the Y // axes currently have no better ranges set. axisSection.setUpperRange(0d); axisSection.setLowerRange(0d); axisSections.add(axisSection); return axisSections; } /** * Creates a list of Section for the chart's Y axes. This method makes use * of <i>getYAxisWalker</i> to be able to access all Y axes defined in * subclasses. * * @return a list of Y axis sections. */ protected List<AxisSection> buildYAxisSections() { List<AxisSection> axisSections = new ArrayList<AxisSection>(); YAxisWalker walker = getYAxisWalker(); for (int i = 0, n = walker.length(); i < n; i++) { AxisSection ySection = new AxisSection(); ySection.setIdentifier(walker.getId(i)); ySection.setLabel(getYAxisLabel(i)); ySection.setFontSize(14); ySection.setFixed(false); // XXX We are able to find better default ranges that [0,0], the // only problem is, that we do NOT have a better range than [0,0] // for each axis, because the initial chart will not have a dataset // for each axis set! ySection.setUpperRange(0d); ySection.setLowerRange(0d); axisSections.add(ySection); } return axisSections; } /** * Returns the <i>settings</i> as <i>ChartSettings</i>. * * @return the <i>settings</i> as <i>ChartSettings</i> or null, if * <i>settings</i> is not an instance of <i>ChartSettings</i>. */ public ChartSettings getChartSettings() { if (settings instanceof ChartSettings) { return (ChartSettings) settings; } return null; } /** * Returns the chart title provided by <i>settings</i>. * * @param settings A ChartSettings object. * * @return the title provided by <i>settings</i> or null if no * <i>ChartSection</i> is provided by <i>settings</i>. * * @throws NullPointerException if <i>settings</i> is null. */ public String getChartTitle(ChartSettings settings) { ChartSection cs = settings.getChartSection(); return cs != null ? cs.getTitle() : null; } /** * Returns the chart subtitle provided by <i>settings</i>. * * @param settings A ChartSettings object. * * @return the subtitle provided by <i>settings</i> or null if no * <i>ChartSection</i> is provided by <i>settings</i>. * * @throws NullPointerException if <i>settings</i> is null. */ public String getChartSubtitle(ChartSettings settings) { ChartSection cs = settings.getChartSection(); return cs != null ? cs.getSubtitle() : null; } /** * Returns a boolean object that determines if the chart grid should be * visible or not. This information needs to be provided by <i>settings</i>, * otherweise the default is true. * * @param settings A ChartSettings object. * * @return true, if the chart grid should be visible otherwise false. * * @throws NullPointerException if <i>settings</i> is null. */ public boolean isGridVisible(ChartSettings settings) { ChartSection cs = settings.getChartSection(); Boolean displayGrid = cs.getDisplayGrid(); return displayGrid != null ? displayGrid : true; } /** * Returns a boolean object that determines if the chart legend should be * visible or not. This information needs to be provided by <i>settings</i>, * otherwise the default is true. * * @param settings A ChartSettings object. * * @return true, if the chart legend should be visible otherwise false. * * @throws NullPointerException if <i>settings</i> is null. */ public boolean isLegendVisible(ChartSettings settings) { LegendSection ls = settings.getLegendSection(); Boolean displayLegend = ls.getVisibility(); return displayLegend != null ? displayLegend : true; } /** * Returns the legend font size specified in <i>settings</i> or null if no * <i>LegendSection</i> is provided by <i>settings</i>. * * @param settings A ChartSettings object. * * @return the legend font size or null. * * @throws NullPointerException if <i>settings</i> is null. */ public Integer getLegendFontSize(ChartSettings settings) { LegendSection ls = settings.getLegendSection(); return ls != null ? ls.getFontSize() : null; } /** * Returns the title of a chart. The return value depends on the existence * of ChartSettings: if there are ChartSettings set, this method returns the * chart title provided by those settings. Otherwise, this method returns * getDefaultChartTitle(). * * @return the title of a chart. */ protected String getChartTitle() { ChartSettings chartSettings = getChartSettings(); if (chartSettings != null) { return getChartTitle(chartSettings); } return getDefaultChartTitle(); } /** * Returns the subtitle of a chart. The return value depends on the * existence of ChartSettings: if there are ChartSettings set, this method * returns the chart title provided by those settings. Otherwise, this * method returns getDefaultChartSubtitle(). * * @return the subtitle of a chart. */ protected String getChartSubtitle() { ChartSettings chartSettings = getChartSettings(); if (chartSettings != null) { return getChartSubtitle(chartSettings); } return getDefaultChartSubtitle(); } /** * This method always returns null. Override it in subclasses that require * subtitles. * * @return null. */ protected String getDefaultChartSubtitle() { // Override this method in subclasses return null; } /** * This method is used to determine, if the chart's legend is visible or * not. If a <i>settings</i> instance is set, this instance determines the * visibility otherwise, this method returns true as default if no * <i>settings</i> is set. * * @return true, if the legend should be visible, otherwise false. */ protected boolean isLegendVisible() { ChartSettings chartSettings = getChartSettings(); if (chartSettings != null) { return isLegendVisible(chartSettings); } return true; } /** * This method is used to determine the font size of the chart's legend. If * a <i>settings</i> instance is set, this instance determines the font * size, otherwise this method returns 12 as default if no <i>settings</i> * is set or if it doesn't provide a legend font size. * * @return a legend font size. */ protected int getLegendFontSize() { Integer fontSize = null; ChartSettings chartSettings = getChartSettings(); if (chartSettings != null) { fontSize = getLegendFontSize(chartSettings); } return fontSize != null ? fontSize : DEFAULT_FONT_SIZE; } /** * This method is used to determine if the resulting chart should display * grid lines or not. <b>Note: this method always returns true!</b> * * @return true, if the chart should display grid lines, otherwise false. */ protected boolean isGridVisible() { return true; } /** * Returns the X-Axis label of a chart. * * @return the X-Axis label of a chart. */ protected String getXAxisLabel() { ChartSettings chartSettings = getChartSettings(); if (chartSettings == null) { return getDefaultXAxisLabel(); } AxisSection as = chartSettings.getAxisSection("X"); if (as != null) { String label = as.getLabel(); if (label != null) { return label; } } return getDefaultXAxisLabel(); } /** * This method returns the font size for the X axis. If the font size is * specified in ChartSettings (if <i>chartSettings</i> is set), this size is * returned. Otherwise the default font size 12 is returned. * * @return the font size for the x axis. */ protected int getXAxisLabelFontSize() { ChartSettings chartSettings = getChartSettings(); if (chartSettings == null) { return DEFAULT_FONT_SIZE; } AxisSection as = chartSettings.getAxisSection("X"); Integer fontSize = as.getFontSize(); return fontSize != null ? fontSize : DEFAULT_FONT_SIZE; } /** * This method returns the font size for an Y axis. If the font size is * specified in ChartSettings (if <i>chartSettings</i> is set), this size is * returned. Otherwise the default font size 12 is returned. * * @return the font size for the x axis. */ protected int getYAxisFontSize(int pos) { ChartSettings chartSettings = getChartSettings(); if (chartSettings == null) { return DEFAULT_FONT_SIZE; } YAxisWalker walker = getYAxisWalker(); AxisSection as = chartSettings.getAxisSection(walker.getId(pos)); Integer fontSize = as.getFontSize(); return fontSize != null ? fontSize : DEFAULT_FONT_SIZE; } /** * This method returns the export dimension specified in ChartSettings as * int array [width,height]. * * @return an int array with [width,height]. */ protected int[] getExportDimension() { ChartSettings chartSettings = getChartSettings(); if (chartSettings == null) { return new int[] { 600, 400 }; } ExportSection export = chartSettings.getExportSection(); Integer width = export.getWidth(); Integer height = export.getHeight(); if (width != null && height != null) { return new int[] { width, height }; } return new int[] { 600, 400 }; } /** * Returns the Y-Axis label of a chart at position <i>pos</i>. * * @return the Y-Axis label of a chart at position <i>0</i>. */ protected String getYAxisLabel(int pos) { ChartSettings chartSettings = getChartSettings(); if (chartSettings == null) { return getDefaultYAxisLabel(pos); } YAxisWalker walker = getYAxisWalker(); AxisSection as = chartSettings.getAxisSection(walker.getId(pos)); if (as != null) { String label = as.getLabel(); if (label != null) { return label; } } return getDefaultYAxisLabel(pos); } /** * This method searches for a specific axis in the <i>settings</i> if * <i>settings</i> is set. If the axis was found, this method returns the * specified axis range if the axis range is fixed. Otherwise, this method * returns null. * * @param axisId The identifier of an axis. * * @return the specified axis range from <i>settings</i> if the axis is * fixed, otherwise null. */ public Range getRangeForAxisFromSettings(String axisId) { ChartSettings chartSettings = getChartSettings(); if (chartSettings == null) { return null; } AxisSection as = chartSettings.getAxisSection(axisId); Boolean fixed = as.isFixed(); if (fixed != null && fixed) { Double upper = as.getUpperRange(); Double lower = as.getLowerRange(); if (upper != null && lower != null) { return lower < upper ? new Range(lower, upper) : new Range(upper, lower); } } return null; } /** * This helper mehtod is used to extract the current locale from instance * vairable <i>context</i>. * * @return the current locale. */ protected Locale getLocale() { CallMeta meta = context.getMeta(); PreferredLocale[] prefs = meta.getLanguages(); int len = prefs != null ? prefs.length : 0; Locale[] locales = new Locale[len]; for (int i = 0; i < len; i++) { locales[i] = prefs[i].getLocale(); } return meta.getPreferredLocale(locales); } protected String msg(String key, String def) { return Resources.getMsg(context.getMeta(), key, def); } protected String msg(String key, String def, Object[] args) { return Resources.getMsg(context.getMeta(), key, def, args); } protected String getRiverName() { FLYSArtifact flys = (FLYSArtifact) master; River river = FLYSUtils.getRiver(flys); return (river != null) ? river.getName() : ""; } protected double[] getRange() { FLYSArtifact flys = (FLYSArtifact) master; return FLYSUtils.getKmRange(flys); } /** * Returns the size of a chart export as array which has been specified by * the incoming request document. * * @return the size of a chart as [width, height] or null if no width or * height are given in the request document. */ protected int[] getSize() { int[] size = new int[2]; Element sizeEl = (Element)XMLUtils.xpath( request, XPATH_CHART_SIZE, XPathConstants.NODE, ArtifactNamespaceContext.INSTANCE); if (sizeEl != null) { String uri = ArtifactNamespaceContext.NAMESPACE_URI; String w = sizeEl.getAttributeNS(uri, "width"); String h = sizeEl.getAttributeNS(uri, "height"); if (w.length() > 0 && h.length() > 0) { try { size[0] = Integer.parseInt(w); size[1] = Integer.parseInt(h); } catch (NumberFormatException nfe) { logger.warn("Wrong values for chart width/height."); } } } return size[0] > 0 && size[1] > 0 ? size : null; } /** * This method returns the format specified in the <i>request</i> document * or <i>DEFAULT_CHART_FORMAT</i> if no format is specified in * <i>request</i>. * * @return the format used to export this chart. */ protected String getFormat() { String format = (String) XMLUtils.xpath( request, XPATH_CHART_FORMAT, XPathConstants.STRING, ArtifactNamespaceContext.INSTANCE); return format == null || format.length() == 0 ? DEFAULT_CHART_FORMAT : format; } /** * Get Range of Domain ("X"-) Axis from request. */ protected Range getDomainAxisRange() { Element xrange = (Element)XMLUtils.xpath( request, XPATH_CHART_X_RANGE, XPathConstants.NODE, ArtifactNamespaceContext.INSTANCE); if (xrange == null) { return null; } String uri = ArtifactNamespaceContext.NAMESPACE_URI; String lower = xrange.getAttributeNS(uri, "from"); String upper = xrange.getAttributeNS(uri, "to"); if (lower.length() > 0 && upper.length() > 0) { try { double from = Double.parseDouble(lower); double to = Double.parseDouble(upper); if (from == 0 && to == 0) { logger.debug("No range specified. Lower and upper X == 0"); return null; } if (from > to) { double tmp = to; to = from; from = tmp; } return new Range(from, to); } catch (NumberFormatException nfe) { logger.warn("Wrong values for domain axis range."); } } return null; } protected Range getValueAxisRange() { Element yrange = (Element)XMLUtils.xpath( request, XPATH_CHART_Y_RANGE, XPathConstants.NODE, ArtifactNamespaceContext.INSTANCE); if (yrange == null) { return null; } String uri = ArtifactNamespaceContext.NAMESPACE_URI; String lower = yrange.getAttributeNS(uri, "from"); String upper = yrange.getAttributeNS(uri, "to"); if (lower.length() > 0 && upper.length() > 0) { try { double from = Double.parseDouble(lower); double to = Double.parseDouble(upper); if (from == 0 && to == 0) { logger.debug("No range specified. Lower and upper Y == 0"); return null; } return from > to ? new Range(to, from) : new Range(from, to); } catch (NumberFormatException nfe) { logger.warn("Wrong values for value axis range."); } } return null; } /** * Returns the default size of a chart export as array. * * @return the default size of a chart as [width, height]. */ protected int[] getDefaultSize() { return new int[] { DEFAULT_CHART_WIDTH, DEFAULT_CHART_HEIGHT }; } /** * Creates a new instance of <i>IdentifiableNumberAxis</i>. * * @param idx The index of the new axis. * @param label The label of the new axis. * * @return an instance of IdentifiableNumberAxis. */ protected NumberAxis createNumberAxis(int idx, String label) { YAxisWalker walker = getYAxisWalker(); return new IdentifiableNumberAxis(walker.getId(idx), label); } /** * Creates a new LegendItem with <i>name</i> and font provided by * <i>createLegendLabelFont()</i>. * * @param theme The theme of the chart line. * @param The displayed name of the item. * * @return a new LegendItem instance. */ public LegendItem createLegendItem(Document theme, String name) { // OPTIMIZE Pass font, parsed Theme items. ThemeAccess themeAccess = new ThemeAccess(theme); Color color = themeAccess.parseLineColorField(); LegendItem legendItem = new LegendItem(name, color); legendItem.setLabelFont(createLegendLabelFont()); return legendItem; } /** * Creates Font (Family and size) to use when creating Legend Items. The * font size depends in the return value of <i>getLegendFontSize()</i>. * * @return a new Font instance with <i>DEFAULT_FONT_NAME</i>. */ protected Font createLegendLabelFont() { return new Font( DEFAULT_FONT_NAME, Font.PLAIN, getLegendFontSize() ); } protected void preparePDFContext(CallContext context) { int[] dimension = getExportDimension(); context.putContextValue("chart.width", dimension[0]); context.putContextValue("chart.height", dimension[1]); context.putContextValue("chart.marginLeft", 5f); context.putContextValue("chart.marginRight", 5f); context.putContextValue("chart.marginTop", 5f); context.putContextValue("chart.marginBottom", 5f); context.putContextValue( "chart.page.format", ChartExportHelper.DEFAULT_PAGE_SIZE); } protected void prepareSVGContext(CallContext context) { int[] dimension = getExportDimension(); context.putContextValue("chart.width", dimension[0]); context.putContextValue("chart.height", dimension[1]); context.putContextValue( "chart.encoding", ChartExportHelper.DEFAULT_ENCODING); } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :