Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/datacage/templating/StackFrames.java @ 8491:7bc675e4e6e0 3.1.9
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author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Tue, 02 Dec 2014 17:54:15 +0100 |
parents | 42acdab9803a |
children | 0a5239a1e46e |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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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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7 */ |
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8 |
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9 package org.dive4elements.river.artifacts.datacage.templating; |
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10 |
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11 import java.util.ArrayList; |
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12 import java.util.Map; |
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13 import java.util.List; |
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14 import java.util.HashMap; |
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15 import java.util.HashSet; |
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16 import java.util.Set; |
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17 |
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18 import javax.xml.xpath.XPathVariableResolver; |
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19 |
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20 import javax.xml.namespace.QName; |
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21 |
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22 import org.apache.log4j.Logger; |
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23 |
4594 | 24 |
25 /** | |
26 * Maintains stack of 'frames' which are maps from string to object. | |
27 * Used for variables in datacage/meta-data system. | |
28 */ | |
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29 public class StackFrames |
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30 implements XPathVariableResolver |
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31 { |
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32 private static Logger log = Logger.getLogger(StackFrames.class); |
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33 |
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34 public static final Object NULL = new Object() { |
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35 @Override |
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36 public String toString() { |
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37 return ""; |
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38 } |
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39 }; |
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40 |
4594 | 41 /** The frames (used like a stack). */ |
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42 protected List<Map<String, Object>> frames; |
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43 |
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44 public StackFrames() { |
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45 frames = new ArrayList<Map<String, Object>>(); |
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46 } |
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47 |
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48 public StackFrames(Map<String, Object> initialFrame) { |
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49 this(); |
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50 if (initialFrame != null) { |
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51 frames.add(new HashMap<String, Object>(initialFrame)); |
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52 } |
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53 } |
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54 |
4594 | 55 /** Push a new String->Object map. */ |
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56 public void enter() { |
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57 frames.add(new HashMap<String, Object>()); |
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58 } |
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59 |
4594 | 60 /** Pop/Remove last String->Object map. */ |
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61 public void leave() { |
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62 frames.remove(frames.size()-1); |
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63 } |
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64 |
4594 | 65 /** Put Key/Value in last String->Object map. */ |
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66 public void put(String key, Object value) { |
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67 int N = frames.size(); |
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68 if (N > 0) { |
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69 frames.get(N-1).put(key, value); |
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70 } |
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71 } |
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72 |
4594 | 73 /** Put multiple Key/Values in last String->Object map. */ |
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74 public void put(String [] keys, Object [] values) { |
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75 Map<String, Object> top = frames.get(frames.size()-1); |
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76 for (int i = 0; i < keys.length; ++i) { |
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77 top.put(keys[i], values[i]); |
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78 } |
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79 } |
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80 |
4594 | 81 /** Check last frame (string->object map) for key. */ |
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82 public boolean containsKey(String key) { |
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83 key = key.toUpperCase(); |
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84 for (int i = frames.size()-1; i >= 0; --i) { |
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85 if (frames.get(i).containsKey(key)) { |
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86 return true; |
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87 } |
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88 } |
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89 return false; |
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90 } |
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91 |
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92 /** |
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93 * Get element (variable) key. |
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94 * Returns null if not found. |
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95 * @param key name to resolve |
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96 * @return resolution, null if not found. |
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97 */ |
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98 public Object get(String key) { |
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99 return get(key, null); |
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100 } |
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101 |
4594 | 102 /** result[0] is modified with value when true returned. |
103 * @return false if key not found in any frame. */ | |
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104 public boolean getStore(String key, Object [] result) { |
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105 |
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106 key = key.toUpperCase(); |
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107 |
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108 for (int i = frames.size()-1; i >= 0; --i) { |
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109 Map<String, Object> frame = frames.get(i); |
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110 if (frame.containsKey(key)) { |
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111 result[0] = frame.get(key); |
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112 return true; |
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113 } |
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114 } |
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115 |
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116 return false; |
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117 } |
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118 |
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119 public Object get(String key, Object def) { |
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120 |
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121 key = key.toUpperCase(); |
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122 |
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123 for (int i = frames.size()-1; i >= 0; --i) { |
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124 Map<String, Object> frame = frames.get(i); |
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125 if (frame.containsKey(key)) { |
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126 return frame.get(key); |
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127 } |
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128 } |
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129 |
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130 return def; |
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131 } |
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132 |
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133 public Object getNull(String key) { |
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134 return getNull(key, null); |
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135 } |
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136 |
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137 public Object getNull(String key, Object def) { |
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138 |
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139 key = key.toUpperCase(); |
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140 |
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141 for (int i = frames.size()-1; i >= 0; --i) { |
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142 Map<String, Object> frame = frames.get(i); |
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143 if (frame.containsKey(key)) { |
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144 Object value = frame.get(key); |
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145 return value != null ? value : NULL; |
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146 } |
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147 } |
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148 |
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149 return def; |
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150 } |
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151 |
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152 @Override |
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153 public Object resolveVariable(QName variableName) { |
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154 /* |
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155 if (log.isDebugEnabled()) { |
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156 log.debug("resolve var: " + variableName); |
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157 } |
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158 */ |
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159 |
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160 return getNull(variableName.getLocalPart()); |
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161 } |
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162 |
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163 public String dump() { |
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164 StringBuilder sb = new StringBuilder("["); |
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165 Set<String> already = new HashSet<String>(); |
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166 |
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167 boolean first = true; |
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168 |
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169 for (int i = frames.size()-1; i >= 0; --i) { |
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170 Map<String, Object> frame = frames.get(i); |
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171 for (Map.Entry<String, Object> entry: frame.entrySet()) { |
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172 if (already.add(entry.getKey())) { |
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173 if (first) { first = false; } |
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174 else { sb.append(", "); } |
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175 if (sb.length() - sb.lastIndexOf("\n") > 80) { |
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176 sb.append("\n"); |
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177 } |
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178 sb.append('\'').append(entry.getKey()) |
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179 .append("'='").append(entry.getValue()).append('\''); |
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180 } |
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181 } |
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182 } |
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183 return sb.append(']').toString(); |
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184 } |
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185 } |
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186 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |