Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/StackFrames.java @ 5703:3ff4f772bcac
Added configuration for online help in conf.xml
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Mon, 15 Apr 2013 12:35:26 +0200 |
parents | 142ed3c62765 |
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rev | line source |
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Datacage: Moved templating in a better suited package.
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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.ArrayList; |
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4 import java.util.Map; |
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5 import java.util.List; |
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6 import java.util.HashMap; |
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7 import java.util.HashSet; |
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8 import java.util.Set; |
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9 |
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10 import javax.xml.xpath.XPathVariableResolver; |
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11 |
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12 import javax.xml.namespace.QName; |
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13 |
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14 import org.apache.log4j.Logger; |
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15 |
4594 | 16 |
17 /** | |
18 * Maintains stack of 'frames' which are maps from string to object. | |
19 * Used for variables in datacage/meta-data system. | |
20 */ | |
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21 public class StackFrames |
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22 implements XPathVariableResolver |
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23 { |
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24 private static Logger log = Logger.getLogger(StackFrames.class); |
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25 |
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26 public static final Object NULL = new Object(); |
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27 |
4594 | 28 /** The frames (used like a stack). */ |
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29 protected List<Map<String, Object>> frames; |
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30 |
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31 public StackFrames() { |
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32 frames = new ArrayList<Map<String, Object>>(); |
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33 } |
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34 |
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35 public StackFrames(Map<String, Object> initialFrame) { |
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36 this(); |
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37 if (initialFrame != null) { |
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38 frames.add(new HashMap<String, Object>(initialFrame)); |
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39 } |
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40 } |
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41 |
4594 | 42 /** Push a new String->Object map. */ |
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43 public void enter() { |
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44 frames.add(new HashMap<String, Object>()); |
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45 } |
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46 |
4594 | 47 /** Pop/Remove last String->Object map. */ |
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48 public void leave() { |
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49 frames.remove(frames.size()-1); |
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50 } |
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51 |
4594 | 52 /** Put Key/Value in last String->Object map. */ |
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53 public void put(String key, Object value) { |
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54 int N = frames.size(); |
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55 if (N > 0) { |
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56 frames.get(N-1).put(key, value); |
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57 } |
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58 } |
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59 |
4594 | 60 /** Put multiple Key/Values in last String->Object map. */ |
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61 public void put(String [] keys, Object [] values) { |
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62 Map<String, Object> top = frames.get(frames.size()-1); |
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63 for (int i = 0; i < keys.length; ++i) { |
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64 top.put(keys[i], values[i]); |
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65 } |
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66 } |
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67 |
4594 | 68 /** Check last frame (string->object map) for key. */ |
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69 public boolean containsKey(String key) { |
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70 key = key.toUpperCase(); |
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71 for (int i = frames.size()-1; i >= 0; --i) { |
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72 if (frames.get(i).containsKey(key)) { |
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73 return true; |
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74 } |
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75 } |
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76 return false; |
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77 } |
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78 |
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79 /** |
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80 * Get element (variable) key. |
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81 * Returns null if not found. |
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82 * @param key name to resolve |
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83 * @return resolution, null if not found. |
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84 */ |
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85 public Object get(String key) { |
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86 return get(key, null); |
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87 } |
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88 |
4594 | 89 /** result[0] is modified with value when true returned. |
90 * @return false if key not found in any frame. */ | |
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91 public boolean getStore(String key, Object [] result) { |
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92 |
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93 key = key.toUpperCase(); |
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94 |
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95 for (int i = frames.size()-1; i >= 0; --i) { |
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96 Map<String, Object> frame = frames.get(i); |
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97 if (frame.containsKey(key)) { |
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98 result[0] = frame.get(key); |
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99 return true; |
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100 } |
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101 } |
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102 |
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103 return false; |
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104 } |
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105 |
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106 public Object get(String key, Object def) { |
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107 |
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108 key = key.toUpperCase(); |
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109 |
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110 for (int i = frames.size()-1; i >= 0; --i) { |
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111 Map<String, Object> frame = frames.get(i); |
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112 if (frame.containsKey(key)) { |
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113 return frame.get(key); |
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114 } |
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115 } |
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116 |
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117 return def; |
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118 } |
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119 |
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120 public Object getNull(String key) { |
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121 return getNull(key, null); |
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122 } |
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123 |
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124 public Object getNull(String key, Object def) { |
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125 |
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126 key = key.toUpperCase(); |
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127 |
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128 for (int i = frames.size()-1; i >= 0; --i) { |
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129 Map<String, Object> frame = frames.get(i); |
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130 if (frame.containsKey(key)) { |
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131 Object value = frame.get(key); |
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132 return value != null ? value : NULL; |
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133 } |
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134 } |
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135 |
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136 return def; |
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137 } |
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138 |
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139 @Override |
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140 public Object resolveVariable(QName variableName) { |
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141 if (log.isDebugEnabled()) { |
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142 log.debug("resolve var: " + variableName); |
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143 } |
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144 |
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145 return getNull(variableName.getLocalPart()); |
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146 } |
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147 |
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148 public String dump() { |
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149 StringBuilder sb = new StringBuilder("["); |
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150 Set<String> already = new HashSet<String>(); |
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151 |
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152 boolean first = true; |
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153 |
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154 for (int i = frames.size()-1; i >= 0; --i) { |
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155 Map<String, Object> frame = frames.get(i); |
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156 for (Map.Entry<String, Object> entry: frame.entrySet()) { |
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157 if (already.add(entry.getKey())) { |
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158 if (first) { first = false; } |
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159 else { sb.append(", "); } |
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160 sb.append('\'').append(entry.getKey()) |
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161 .append("'='").append(entry.getValue()).append('\''); |
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162 } |
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163 } |
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164 } |
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165 return sb.append(']').toString(); |
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166 } |
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167 } |
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168 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |