Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/datacage/templating/StackFrames.java @ 5994:af13ceeba52a
Removed trailing whitespace.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Sun, 12 May 2013 18:13:50 +0200 |
parents | 4897a58c8746 |
children | a596ddb42fb3 |
rev | line source |
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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 |
4594 | 36 /** The frames (used like a stack). */ |
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37 protected List<Map<String, Object>> frames; |
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38 |
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39 public StackFrames() { |
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40 frames = new ArrayList<Map<String, Object>>(); |
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41 } |
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42 |
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43 public StackFrames(Map<String, Object> initialFrame) { |
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44 this(); |
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45 if (initialFrame != null) { |
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46 frames.add(new HashMap<String, Object>(initialFrame)); |
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47 } |
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48 } |
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49 |
4594 | 50 /** Push a new String->Object map. */ |
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51 public void enter() { |
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52 frames.add(new HashMap<String, Object>()); |
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53 } |
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54 |
4594 | 55 /** Pop/Remove last String->Object map. */ |
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56 public void leave() { |
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57 frames.remove(frames.size()-1); |
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58 } |
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59 |
4594 | 60 /** Put Key/Value in last String->Object map. */ |
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61 public void put(String key, Object value) { |
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62 int N = frames.size(); |
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63 if (N > 0) { |
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64 frames.get(N-1).put(key, value); |
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65 } |
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66 } |
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67 |
4594 | 68 /** Put multiple Key/Values in last String->Object map. */ |
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69 public void put(String [] keys, Object [] values) { |
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70 Map<String, Object> top = frames.get(frames.size()-1); |
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71 for (int i = 0; i < keys.length; ++i) { |
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72 top.put(keys[i], values[i]); |
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73 } |
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74 } |
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75 |
4594 | 76 /** Check last frame (string->object map) for key. */ |
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77 public boolean containsKey(String key) { |
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78 key = key.toUpperCase(); |
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79 for (int i = frames.size()-1; i >= 0; --i) { |
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80 if (frames.get(i).containsKey(key)) { |
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81 return true; |
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82 } |
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83 } |
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84 return false; |
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85 } |
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86 |
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87 /** |
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88 * Get element (variable) key. |
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89 * Returns null if not found. |
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90 * @param key name to resolve |
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91 * @return resolution, null if not found. |
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92 */ |
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93 public Object get(String key) { |
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94 return get(key, null); |
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95 } |
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96 |
4594 | 97 /** result[0] is modified with value when true returned. |
98 * @return false if key not found in any frame. */ | |
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99 public boolean getStore(String key, Object [] result) { |
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100 |
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101 key = key.toUpperCase(); |
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102 |
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103 for (int i = frames.size()-1; i >= 0; --i) { |
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104 Map<String, Object> frame = frames.get(i); |
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105 if (frame.containsKey(key)) { |
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106 result[0] = frame.get(key); |
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107 return true; |
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108 } |
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109 } |
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110 |
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111 return false; |
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112 } |
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113 |
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114 public Object get(String key, Object def) { |
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115 |
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116 key = key.toUpperCase(); |
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117 |
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118 for (int i = frames.size()-1; i >= 0; --i) { |
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119 Map<String, Object> frame = frames.get(i); |
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120 if (frame.containsKey(key)) { |
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121 return frame.get(key); |
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122 } |
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123 } |
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124 |
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125 return def; |
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126 } |
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127 |
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128 public Object getNull(String key) { |
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129 return getNull(key, null); |
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130 } |
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131 |
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132 public Object getNull(String key, Object def) { |
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133 |
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134 key = key.toUpperCase(); |
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135 |
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136 for (int i = frames.size()-1; i >= 0; --i) { |
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137 Map<String, Object> frame = frames.get(i); |
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138 if (frame.containsKey(key)) { |
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139 Object value = frame.get(key); |
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140 return value != null ? value : NULL; |
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141 } |
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142 } |
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143 |
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144 return def; |
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145 } |
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146 |
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147 @Override |
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148 public Object resolveVariable(QName variableName) { |
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149 if (log.isDebugEnabled()) { |
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150 log.debug("resolve var: " + variableName); |
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151 } |
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152 |
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153 return getNull(variableName.getLocalPart()); |
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154 } |
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155 |
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156 public String dump() { |
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157 StringBuilder sb = new StringBuilder("["); |
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158 Set<String> already = new HashSet<String>(); |
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159 |
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160 boolean first = true; |
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161 |
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162 for (int i = frames.size()-1; i >= 0; --i) { |
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163 Map<String, Object> frame = frames.get(i); |
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164 for (Map.Entry<String, Object> entry: frame.entrySet()) { |
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165 if (already.add(entry.getKey())) { |
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166 if (first) { first = false; } |
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167 else { sb.append(", "); } |
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168 sb.append('\'').append(entry.getKey()) |
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169 .append("'='").append(entry.getValue()).append('\''); |
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170 } |
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171 } |
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172 } |
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173 return sb.append(']').toString(); |
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174 } |
998
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175 } |
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176 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |