Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/AbstractChartService.java @ 4221:480de0dbca8e

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Extended location input helper. The locationpicker has now an attribute whether the input is distance or location to display one or two clickable columns. Replaced the record click handler with cell click handler.
author Raimund Renkert <rrenkert@intevation.de>
date Tue, 23 Oct 2012 13:17:20 +0200
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;
0674d89210f5 Added a new service to query a diagram with discharge tables.
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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
0674d89210f5 Added a new service to query a diagram with discharge tables.
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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
0674d89210f5 Added a new service to query a diagram with discharge tables.
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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
0674d89210f5 Added a new service to query a diagram with discharge tables.
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23 public abstract class AbstractChartService extends DefaultService {
0674d89210f5 Added a new service to query a diagram with discharge tables.
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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
0674d89210f5 Added a new service to query a diagram with discharge tables.
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30 private static final Logger log = Logger
0674d89210f5 Added a new service to query a diagram with discharge tables.
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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,
0674d89210f5 Added a new service to query a diagram with discharge tables.
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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,
0674d89210f5 Added a new service to query a diagram with discharge tables.
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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,
0674d89210f5 Added a new service to query a diagram with discharge tables.
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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,
0674d89210f5 Added a new service to query a diagram with discharge tables.
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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,
0674d89210f5 Added a new service to query a diagram with discharge tables.
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51 (byte) 0x77, (byte) 0x36, (byte) 0x0b, (byte) 0x00, (byte) 0x00,
0674d89210f5 Added a new service to query a diagram with discharge tables.
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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,
0674d89210f5 Added a new service to query a diagram with discharge tables.
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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,
0674d89210f5 Added a new service to query a diagram with discharge tables.
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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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