Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/AbstractChartService.java @ 4357:11cf29eb002c
FacetTypes: New type: exreme_wq_curve_base (for the Stuetz-Q-Poits).
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Fri, 02 Nov 2012 11:58:11 +0100 |
parents | 0674d89210f5 |
children | 61f4d4164a30 |
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package de.intevation.flys.artifacts.services; import java.awt.Dimension; import java.awt.Transparency; import java.awt.image.BufferedImage; import java.io.ByteArrayOutputStream; import java.io.IOException; import javax.imageio.ImageIO; import org.apache.log4j.Logger; import org.jfree.chart.JFreeChart; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; import de.intevation.artifactdatabase.DefaultService; import de.intevation.artifacts.CallMeta; import de.intevation.artifacts.GlobalContext; import de.intevation.artifacts.Service; public abstract class AbstractChartService extends DefaultService { public static final int DEFAULT_WIDTH = 240; public static final int DEFAULT_HEIGHT = 180; public static final String DEFAULT_FORMAT = "png"; private static final Logger log = Logger .getLogger(AbstractChartService.class); // TODO: Load fancy image from resources. public static final byte[] EMPTY = { (byte) 0x89, (byte) 0x50, (byte) 0x4e, (byte) 0x47, (byte) 0x0d, (byte) 0x0a, (byte) 0x1a, (byte) 0x0a, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x0d, (byte) 0x49, (byte) 0x48, (byte) 0x44, (byte) 0x52, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x01, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x01, (byte) 0x08, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x3a, (byte) 0x7e, (byte) 0x9b, (byte) 0x55, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x01, (byte) 0x73, (byte) 0x52, (byte) 0x47, (byte) 0x42, (byte) 0x00, (byte) 0xae, (byte) 0xce, (byte) 0x1c, (byte) 0xe9, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x09, (byte) 0x70, (byte) 0x48, (byte) 0x59, (byte) 0x73, (byte) 0x00, (byte) 0x00, (byte) 0x0b, (byte) 0x13, (byte) 0x00, (byte) 0x00, (byte) 0x0b, (byte) 0x13, (byte) 0x01, (byte) 0x00, (byte) 0x9a, (byte) 0x9c, (byte) 0x18, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x07, (byte) 0x74, (byte) 0x49, (byte) 0x4d, (byte) 0x45, (byte) 0x07, (byte) 0xdc, (byte) 0x04, (byte) 0x04, (byte) 0x10, (byte) 0x30, (byte) 0x15, (byte) 0x7d, (byte) 0x77, (byte) 0x36, (byte) 0x0b, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x08, (byte) 0x74, (byte) 0x45, (byte) 0x58, (byte) 0x74, (byte) 0x43, (byte) 0x6f, (byte) 0x6d, (byte) 0x6d, (byte) 0x65, (byte) 0x6e, (byte) 0x74, (byte) 0x00, (byte) 0xf6, (byte) 0xcc, (byte) 0x96, (byte) 0xbf, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x0a, (byte) 0x49, (byte) 0x44, (byte) 0x41, (byte) 0x54, (byte) 0x08, (byte) 0xd7, (byte) 0x63, (byte) 0xf8, (byte) 0x0f, (byte) 0x00, (byte) 0x01, (byte) 0x01, (byte) 0x01, (byte) 0x00, (byte) 0x1b, (byte) 0xb6, (byte) 0xee, (byte) 0x56, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x49, (byte) 0x45, (byte) 0x4e, (byte) 0x44, (byte) 0xae, (byte) 0x42, (byte) 0x60, (byte) 0x82 }; private static final Output empty() { return new Output(EMPTY, "image/png"); } protected abstract JFreeChart createChart(Document data, GlobalContext globalContext, CallMeta callMeta); protected void init() { }; protected void finish() { }; @Override public Service.Output process(Document data, GlobalContext globalContext, CallMeta callMeta) { log.debug("process"); init(); try { JFreeChart chart = createChart(data, globalContext, callMeta); if (chart == null) { return empty(); } Dimension extent = getExtent(data); String format = getFormat(data); return encode(chart, extent, format); } finally { finish(); } } protected static Output encode(JFreeChart chart, Dimension extent, String format) { BufferedImage image = chart.createBufferedImage(extent.width, extent.height, Transparency.BITMASK, null); ByteArrayOutputStream out = new ByteArrayOutputStream(); try { ImageIO.write(image, format, out); } catch (IOException ioe) { log.warn("writing image failed", ioe); return empty(); } return new Output(out.toByteArray(), "image/" + format); } protected static Dimension getExtent(Document input) { int width = DEFAULT_WIDTH; int height = DEFAULT_HEIGHT; NodeList extents = input.getElementsByTagName("extent"); if (extents.getLength() > 0) { Element element = (Element) extents.item(0); String w = element.getAttribute("width"); String h = element.getAttribute("height"); try { width = Math.max(1, Integer.parseInt(w)); } catch (NumberFormatException nfe) { log.warn("width '" + w + "' is not a valid."); } try { height = Math.max(1, Integer.parseInt(h)); } catch (NumberFormatException nfe) { log.warn("height '" + h + "' is not a valid"); } } return new Dimension(width, height); } protected static String getFormat(Document input) { String format = DEFAULT_FORMAT; NodeList formats = input.getElementsByTagName("format"); if (formats.getLength() > 0) { String type = ((Element) formats.item(0)).getAttribute("type"); if (type.length() > 0) { format = type; } } return format; } }