Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/AbstractChartService.java @ 4362:17251b058bf1

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ExtremeWQCurveGenerator: Reuse prerpareChartData, handle new extreme_wq_curve_base facet.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Fri, 02 Nov 2012 12:09:50 +0100
parents 0674d89210f5
children 61f4d4164a30
rev   line source
4213
0674d89210f5 Added a new service to query a diagram with discharge tables.
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1 package de.intevation.flys.artifacts.services;
0674d89210f5 Added a new service to query a diagram with discharge tables.
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2
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3 import java.awt.Dimension;
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4 import java.awt.Transparency;
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5 import java.awt.image.BufferedImage;
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6 import java.io.ByteArrayOutputStream;
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7 import java.io.IOException;
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8
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9 import javax.imageio.ImageIO;
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10
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11 import org.apache.log4j.Logger;
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12 import org.jfree.chart.JFreeChart;
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13 import org.w3c.dom.Document;
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14 import org.w3c.dom.Element;
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15 import org.w3c.dom.NodeList;
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16
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17 import de.intevation.artifactdatabase.DefaultService;
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18 import de.intevation.artifacts.CallMeta;
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19 import de.intevation.artifacts.GlobalContext;
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20 import de.intevation.artifacts.Service;
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21
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22
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23 public abstract class AbstractChartService extends DefaultService {
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24
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25 public static final int DEFAULT_WIDTH = 240;
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26 public static final int DEFAULT_HEIGHT = 180;
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27
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28 public static final String DEFAULT_FORMAT = "png";
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29
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30 private static final Logger log = Logger
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31 .getLogger(AbstractChartService.class);
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32
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33 // TODO: Load fancy image from resources.
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34 public static final byte[] EMPTY = { (byte) 0x89, (byte) 0x50, (byte) 0x4e,
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35 (byte) 0x47, (byte) 0x0d, (byte) 0x0a, (byte) 0x1a, (byte) 0x0a,
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36 (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x0d, (byte) 0x49,
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37 (byte) 0x48, (byte) 0x44, (byte) 0x52, (byte) 0x00, (byte) 0x00,
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38 (byte) 0x00, (byte) 0x01, (byte) 0x00, (byte) 0x00, (byte) 0x00,
0674d89210f5 Added a new service to query a diagram with discharge tables.
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39 (byte) 0x01, (byte) 0x08, (byte) 0x00, (byte) 0x00, (byte) 0x00,
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40 (byte) 0x00, (byte) 0x3a, (byte) 0x7e, (byte) 0x9b, (byte) 0x55,
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41 (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x01, (byte) 0x73,
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42 (byte) 0x52, (byte) 0x47, (byte) 0x42, (byte) 0x00, (byte) 0xae,
0674d89210f5 Added a new service to query a diagram with discharge tables.
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43 (byte) 0xce, (byte) 0x1c, (byte) 0xe9, (byte) 0x00, (byte) 0x00,
0674d89210f5 Added a new service to query a diagram with discharge tables.
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44 (byte) 0x00, (byte) 0x09, (byte) 0x70, (byte) 0x48, (byte) 0x59,
0674d89210f5 Added a new service to query a diagram with discharge tables.
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45 (byte) 0x73, (byte) 0x00, (byte) 0x00, (byte) 0x0b, (byte) 0x13,
0674d89210f5 Added a new service to query a diagram with discharge tables.
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46 (byte) 0x00, (byte) 0x00, (byte) 0x0b, (byte) 0x13, (byte) 0x01,
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47 (byte) 0x00, (byte) 0x9a, (byte) 0x9c, (byte) 0x18, (byte) 0x00,
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48 (byte) 0x00, (byte) 0x00, (byte) 0x07, (byte) 0x74, (byte) 0x49,
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49 (byte) 0x4d, (byte) 0x45, (byte) 0x07, (byte) 0xdc, (byte) 0x04,
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50 (byte) 0x04, (byte) 0x10, (byte) 0x30, (byte) 0x15, (byte) 0x7d,
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51 (byte) 0x77, (byte) 0x36, (byte) 0x0b, (byte) 0x00, (byte) 0x00,
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52 (byte) 0x00, (byte) 0x08, (byte) 0x74, (byte) 0x45, (byte) 0x58,
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53 (byte) 0x74, (byte) 0x43, (byte) 0x6f, (byte) 0x6d, (byte) 0x6d,
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54 (byte) 0x65, (byte) 0x6e, (byte) 0x74, (byte) 0x00, (byte) 0xf6,
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55 (byte) 0xcc, (byte) 0x96, (byte) 0xbf, (byte) 0x00, (byte) 0x00,
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56 (byte) 0x00, (byte) 0x0a, (byte) 0x49, (byte) 0x44, (byte) 0x41,
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57 (byte) 0x54, (byte) 0x08, (byte) 0xd7, (byte) 0x63, (byte) 0xf8,
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58 (byte) 0x0f, (byte) 0x00, (byte) 0x01, (byte) 0x01, (byte) 0x01,
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59 (byte) 0x00, (byte) 0x1b, (byte) 0xb6, (byte) 0xee, (byte) 0x56,
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60 (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x49,
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61 (byte) 0x45, (byte) 0x4e, (byte) 0x44, (byte) 0xae, (byte) 0x42,
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62 (byte) 0x60, (byte) 0x82 };
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63
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64 private static final Output empty() {
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65 return new Output(EMPTY, "image/png");
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66 }
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67
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68 protected abstract JFreeChart createChart(Document data,
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69 GlobalContext globalContext, CallMeta callMeta);
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70
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71 protected void init() {
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72 };
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73
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74 protected void finish() {
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75 };
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76
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77 @Override
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78 public Service.Output process(Document data, GlobalContext globalContext,
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79 CallMeta callMeta) {
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80 log.debug("process");
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81
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82 init();
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83 try {
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84 JFreeChart chart = createChart(data, globalContext, callMeta);
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85
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86 if (chart == null) {
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87 return empty();
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88 }
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89
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90 Dimension extent = getExtent(data);
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91 String format = getFormat(data);
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92
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93 return encode(chart, extent, format);
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94 }
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95 finally {
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96 finish();
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97 }
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98 }
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99
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100 protected static Output encode(JFreeChart chart, Dimension extent,
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101 String format) {
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102 BufferedImage image = chart.createBufferedImage(extent.width,
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103 extent.height, Transparency.BITMASK, null);
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104
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105 ByteArrayOutputStream out = new ByteArrayOutputStream();
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106
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107 try {
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108 ImageIO.write(image, format, out);
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109 }
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110 catch (IOException ioe) {
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111 log.warn("writing image failed", ioe);
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112 return empty();
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113 }
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114
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115 return new Output(out.toByteArray(), "image/" + format);
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116 }
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117
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118 protected static Dimension getExtent(Document input) {
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119
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120 int width = DEFAULT_WIDTH;
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121 int height = DEFAULT_HEIGHT;
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122
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123 NodeList extents = input.getElementsByTagName("extent");
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124
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125 if (extents.getLength() > 0) {
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126 Element element = (Element) extents.item(0);
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127 String w = element.getAttribute("width");
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128 String h = element.getAttribute("height");
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129
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130 try {
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131 width = Math.max(1, Integer.parseInt(w));
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132 }
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133 catch (NumberFormatException nfe) {
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134 log.warn("width '" + w + "' is not a valid.");
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135 }
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136
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137 try {
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138 height = Math.max(1, Integer.parseInt(h));
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139 }
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140 catch (NumberFormatException nfe) {
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141 log.warn("height '" + h + "' is not a valid");
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142 }
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143 }
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144
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145 return new Dimension(width, height);
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146 }
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147
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148 protected static String getFormat(Document input) {
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149 String format = DEFAULT_FORMAT;
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150
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151 NodeList formats = input.getElementsByTagName("format");
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152
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153 if (formats.getLength() > 0) {
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154 String type = ((Element) formats.item(0)).getAttribute("type");
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155 if (type.length() > 0) {
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156 format = type;
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157 }
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158 }
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159
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160 return format;
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161 }
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162 }
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