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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/FunctionResolver.java @ 4903:5ab87837622f

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Sort the locations array in new datacage templating language functions.
author Raimund Renkert <rrenkert@intevation.de>
date Tue, 29 Jan 2013 17:42:04 +0100
parents e1566938d04c
children 1e379598c47a
rev   line source
998
b81626b10cb7 Datacage: Moved templating in a better suited package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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1 package de.intevation.flys.artifacts.datacage.templating;
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2
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3 import java.util.Arrays;
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4 import java.util.List;
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5 import java.util.Collection;
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6 import java.util.Map;
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7 import java.util.ArrayList;
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8
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9 import javax.xml.xpath.XPathFunctionResolver;
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10 import javax.xml.xpath.XPathFunction;
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11 import javax.xml.xpath.XPathFunctionException;
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12
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13 import javax.xml.namespace.QName;
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14
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15 import org.apache.log4j.Logger;
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17
Felix Wolfsteller <felix.wolfsteller@intevation.de>
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18 /** Resolves functions (e.g. dc:contains) in Datacage/Meta-Data system. */
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19 public class FunctionResolver
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20 implements XPathFunctionResolver
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21 {
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22 /** Home logger. */
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23 private static Logger log = Logger.getLogger(FunctionResolver.class);
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24
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25 public static final String FUNCTION_NAMESPACE_URI = "dc";
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26
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27 public static final class Entry {
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28
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29 String name;
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30 XPathFunction function;
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31 int arity;
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32
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33 public Entry() {
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34 }
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35
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36 public Entry(String name, XPathFunction function, int arity) {
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37 this.name = name;
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38 this.function = function;
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39 this.arity = arity;
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40 }
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41 } // class Entry
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42
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43 public static final FunctionResolver FUNCTIONS = new FunctionResolver();
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44
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45 static {
1930
de0c2bbb27f9 Cosmetics, docs.
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46 /** Implementation of case-ignoring dc:contains. */
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47 FUNCTIONS.addFunction("contains", 2, new XPathFunction() {
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48 @Override
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49 public Object evaluate(List args) throws XPathFunctionException {
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50 Object haystack = args.get(0);
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51 Object needle = args.get(1);
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52
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53 if (needle instanceof String) {
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54 needle = ((String)needle).toUpperCase();
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55 }
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56
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57 try {
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58 if (haystack instanceof Collection) {
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59 return Boolean.valueOf(
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60 ((Collection)haystack).contains(needle));
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61 }
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62
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63 if (haystack instanceof Map) {
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64 return Boolean.valueOf(
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65 ((Map)haystack).containsKey(needle));
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66 }
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67
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68 if (haystack instanceof Object []) {
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69 for (Object straw: (Object [])haystack) {
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70 if (straw.equals(needle)) {
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71 return Boolean.TRUE;
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72 }
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73 }
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74 }
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75
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76 return Boolean.FALSE;
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77 }
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78 catch (Exception e) {
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79 log.error(e);
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80 throw new XPathFunctionException(e);
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81 }
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82 }
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83 });
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84 }
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85
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86 static {
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87 /** Implementation for getting the minimum value of location or distance
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88 * dc:fromValue. */
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89 FUNCTIONS.addFunction("fromValue", 3, new XPathFunction() {
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90 @Override
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91 public Object evaluate(List args) throws XPathFunctionException {
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92 Object mode = args.get(0);
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93 Object locations = args.get(1);
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94 Object from = args.get(2);
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95
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96 if (!(mode instanceof String)){
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97 return -Double.MAX_VALUE;
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98 }
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99
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100 if (mode.equals("locations")) {
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101 if (!(locations instanceof String)) {
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102 return -Double.MAX_VALUE;
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103 }
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104 else {
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105 String loc = ((String)locations).replace(" ", "");
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106 String[] split = loc.split(",");
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107 Arrays.sort(split);
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108 return split[0];
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109 }
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110 }
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111 else if (mode.equals("distance")) {
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112 if (!(from instanceof String)) {
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113 return -Double.MAX_VALUE;
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114 }
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115 String f = (String)from;
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116 try {
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117 return Double.parseDouble(f);
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118 }
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119 catch(NumberFormatException nfe) {
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120 return -Double.MAX_VALUE;
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121 }
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122 }
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123 else {
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124 return -Double.MAX_VALUE;
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125 }
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126 }
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127 });
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128 }
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129
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130 static {
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131 /** Implementation for getting the maximum value of location or distance
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132 * dc:toValue. */
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133 FUNCTIONS.addFunction("toValue", 3, new XPathFunction() {
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134 @Override
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135 public Object evaluate(List args) throws XPathFunctionException {
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136 Object mode = args.get(0);
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137 Object locations = args.get(1);
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138 Object to = args.get(2);
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139
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140 if (!(mode instanceof String)){
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141 return Double.MAX_VALUE;
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142 }
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143
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144 if (mode.equals("locations")) {
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145 if (!(locations instanceof String)) {
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146 return Double.MAX_VALUE;
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147 }
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148 else {
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149 String loc = ((String)locations).replace(" ", "");
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150 String[] split = loc.split(",");
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5ab87837622f Sort the locations array in new datacage templating language functions.
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151 Arrays.sort(split);
4902
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152 return split[split.length - 1];
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153 }
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154 }
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155 else if (mode.equals("distance")) {
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156 if (!(to instanceof String)) {
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157 return Double.MAX_VALUE;
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158 }
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159 else {
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160 String t = (String)to;
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161 try {
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162 return Double.parseDouble(t);
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163 }
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164 catch(NumberFormatException nfe) {
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165 return Double.MAX_VALUE;
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166 }
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167 }
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168 }
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169 else {
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170 return Double.MAX_VALUE;
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171 }
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172 }
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173 });
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174 }
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175
4594
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176 /** List of functions. */
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177 protected List<Entry> functions;
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178
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179 public FunctionResolver() {
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180 functions = new ArrayList<Entry>();
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181 }
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182
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183 /**
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184 * Create a new function.
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185 * @param name Name of the function.
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186 * @param arity Number of arguments for function.
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187 * @param function the function itself.
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188 */
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189 public void addFunction(String name, int arity, XPathFunction function) {
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190 functions.add(new Entry(name, function, arity));
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191 }
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192
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193 @Override
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194 public XPathFunction resolveFunction(QName functionName, int arity) {
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195
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196 if (!functionName.getNamespaceURI().equals(FUNCTION_NAMESPACE_URI)) {
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197 return null;
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198 }
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199
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200 String name = functionName.getLocalPart();
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201 for (Entry entry: functions) {
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parents:
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202 if (entry.arity == arity && entry.name.equals(name)) {
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diff changeset
203 return entry.function;
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204 }
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parents:
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205 }
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206
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207 return null;
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208 }
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209 }
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210 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org