Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/services/AbstractChartService.java @ 8574:c16d04f2c5bc

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There seems to be no use case for not overriding these methods.
author Tom Gottfried <tom@intevation.de>
date Fri, 06 Mar 2015 12:26:12 +0100
parents af13ceeba52a
children 0a5239a1e46e
rev   line source
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4897a58c8746 River artifacts: Added new copyright headers.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
4897a58c8746 River artifacts: Added new copyright headers.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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2 * Software engineering by Intevation GmbH
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Sascha L. Teichmann <teichmann@intevation.de>
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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Sascha L. Teichmann <teichmann@intevation.de>
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7 */
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Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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8
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Sascha L. Teichmann <teichmann@intevation.de>
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9 package org.dive4elements.river.artifacts.services;
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10
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11 import java.awt.Dimension;
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12 import java.awt.Transparency;
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13 import java.awt.image.BufferedImage;
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14 import java.io.ByteArrayOutputStream;
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15 import java.io.IOException;
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16
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17 import javax.imageio.ImageIO;
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18
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19 import org.apache.log4j.Logger;
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20 import org.jfree.chart.JFreeChart;
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21 import org.w3c.dom.Document;
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22 import org.w3c.dom.Element;
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23 import org.w3c.dom.NodeList;
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24
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25 import org.dive4elements.artifactdatabase.DefaultService;
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26 import org.dive4elements.artifacts.CallMeta;
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27 import org.dive4elements.artifacts.GlobalContext;
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28 import org.dive4elements.artifacts.Service;
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29
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61f4d4164a30 Doc, cosmetics.
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30 /** Serve chart. */
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31 public abstract class AbstractChartService extends DefaultService {
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32
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33 public static final int DEFAULT_WIDTH = 240;
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34 public static final int DEFAULT_HEIGHT = 180;
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35
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36 public static final String DEFAULT_FORMAT = "png";
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37
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38 private static final Logger log = Logger
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39 .getLogger(AbstractChartService.class);
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40
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41 // TODO: Load fancy image from resources.
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42 public static final byte[] EMPTY = { (byte) 0x89, (byte) 0x50, (byte) 0x4e,
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43 (byte) 0x47, (byte) 0x0d, (byte) 0x0a, (byte) 0x1a, (byte) 0x0a,
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44 (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x0d, (byte) 0x49,
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45 (byte) 0x48, (byte) 0x44, (byte) 0x52, (byte) 0x00, (byte) 0x00,
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46 (byte) 0x00, (byte) 0x01, (byte) 0x00, (byte) 0x00, (byte) 0x00,
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47 (byte) 0x01, (byte) 0x08, (byte) 0x00, (byte) 0x00, (byte) 0x00,
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48 (byte) 0x00, (byte) 0x3a, (byte) 0x7e, (byte) 0x9b, (byte) 0x55,
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49 (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x01, (byte) 0x73,
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50 (byte) 0x52, (byte) 0x47, (byte) 0x42, (byte) 0x00, (byte) 0xae,
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51 (byte) 0xce, (byte) 0x1c, (byte) 0xe9, (byte) 0x00, (byte) 0x00,
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52 (byte) 0x00, (byte) 0x09, (byte) 0x70, (byte) 0x48, (byte) 0x59,
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53 (byte) 0x73, (byte) 0x00, (byte) 0x00, (byte) 0x0b, (byte) 0x13,
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54 (byte) 0x00, (byte) 0x00, (byte) 0x0b, (byte) 0x13, (byte) 0x01,
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55 (byte) 0x00, (byte) 0x9a, (byte) 0x9c, (byte) 0x18, (byte) 0x00,
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56 (byte) 0x00, (byte) 0x00, (byte) 0x07, (byte) 0x74, (byte) 0x49,
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57 (byte) 0x4d, (byte) 0x45, (byte) 0x07, (byte) 0xdc, (byte) 0x04,
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58 (byte) 0x04, (byte) 0x10, (byte) 0x30, (byte) 0x15, (byte) 0x7d,
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59 (byte) 0x77, (byte) 0x36, (byte) 0x0b, (byte) 0x00, (byte) 0x00,
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60 (byte) 0x00, (byte) 0x08, (byte) 0x74, (byte) 0x45, (byte) 0x58,
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61 (byte) 0x74, (byte) 0x43, (byte) 0x6f, (byte) 0x6d, (byte) 0x6d,
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62 (byte) 0x65, (byte) 0x6e, (byte) 0x74, (byte) 0x00, (byte) 0xf6,
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63 (byte) 0xcc, (byte) 0x96, (byte) 0xbf, (byte) 0x00, (byte) 0x00,
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64 (byte) 0x00, (byte) 0x0a, (byte) 0x49, (byte) 0x44, (byte) 0x41,
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65 (byte) 0x54, (byte) 0x08, (byte) 0xd7, (byte) 0x63, (byte) 0xf8,
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66 (byte) 0x0f, (byte) 0x00, (byte) 0x01, (byte) 0x01, (byte) 0x01,
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67 (byte) 0x00, (byte) 0x1b, (byte) 0xb6, (byte) 0xee, (byte) 0x56,
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68 (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x49,
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69 (byte) 0x45, (byte) 0x4e, (byte) 0x44, (byte) 0xae, (byte) 0x42,
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70 (byte) 0x60, (byte) 0x82 };
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71
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72 private static final Output empty() {
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73 return new Output(EMPTY, "image/png");
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74 }
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75
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76 protected abstract JFreeChart createChart(Document data,
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77 GlobalContext globalContext, CallMeta callMeta);
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78
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79 protected abstract void init();
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80
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81 protected abstract void finish();
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82
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83 @Override
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84 public Service.Output process(Document data, GlobalContext globalContext,
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85 CallMeta callMeta) {
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86 log.debug("process");
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87
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88 init();
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89 try {
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90 JFreeChart chart = createChart(data, globalContext, callMeta);
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91
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92 if (chart == null) {
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93 return empty();
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94 }
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95
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96 Dimension extent = getExtent(data);
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97 String format = getFormat(data);
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98
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99 return encode(chart, extent, format);
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100 }
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101 finally {
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102 finish();
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103 }
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104 }
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105
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106 protected static Output encode(JFreeChart chart, Dimension extent,
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107 String format) {
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108 BufferedImage image = chart.createBufferedImage(extent.width,
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109 extent.height, Transparency.BITMASK, null);
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110
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111 ByteArrayOutputStream out = new ByteArrayOutputStream();
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112
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113 try {
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114 ImageIO.write(image, format, out);
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115 }
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116 catch (IOException ioe) {
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117 log.warn("writing image failed", ioe);
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118 return empty();
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119 }
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120
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121 return new Output(out.toByteArray(), "image/" + format);
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122 }
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123
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124 protected static Dimension getExtent(Document input) {
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125
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126 int width = DEFAULT_WIDTH;
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127 int height = DEFAULT_HEIGHT;
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128
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129 NodeList extents = input.getElementsByTagName("extent");
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130
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131 if (extents.getLength() > 0) {
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132 Element element = (Element) extents.item(0);
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133 String w = element.getAttribute("width");
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134 String h = element.getAttribute("height");
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135
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136 try {
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137 width = Math.max(1, Integer.parseInt(w));
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138 }
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139 catch (NumberFormatException nfe) {
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140 log.warn("width '" + w + "' is not a valid.");
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141 }
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142
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143 try {
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144 height = Math.max(1, Integer.parseInt(h));
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145 }
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146 catch (NumberFormatException nfe) {
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147 log.warn("height '" + h + "' is not a valid");
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148 }
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149 }
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150
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151 return new Dimension(width, height);
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152 }
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153
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154 protected static String getFormat(Document input) {
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155 String format = DEFAULT_FORMAT;
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156
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157 NodeList formats = input.getElementsByTagName("format");
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158
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159 if (formats.getLength() > 0) {
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160 String type = ((Element) formats.item(0)).getAttribute("type");
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161 if (type.length() > 0) {
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162 format = type;
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163 }
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164 }
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165
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166 return format;
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167 }
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168 }
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