Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/StackFrames.java @ 4915:bbedd9af069e dc-km-filter
[branch dc-km-filter] StackFrames: New putGlobal to add variable to bottom of stack.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Wed, 30 Jan 2013 15:52:05 +0100 |
parents | 4d1e2a0c283a |
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rev | line source |
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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. | |
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19 * Used for variables in datacage/meta-data system and acts |
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20 * as a XPathVariablResolver in xpath evaluation, e.g. by own |
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21 * dc: - methods. |
4594 | 22 */ |
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23 public class StackFrames |
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24 implements XPathVariableResolver |
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25 { |
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26 private static Logger log = Logger.getLogger(StackFrames.class); |
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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 |
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60 public void putGlobal(String key, Object value) { |
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61 if (!frames.isEmpty()) { |
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62 frames.get(0).put(key, value); |
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63 } |
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64 else { |
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65 log.warn("Try to register global variable, but no frames!"); |
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66 } |
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67 } |
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68 |
4594 | 69 /** Put multiple Key/Values in last String->Object map. */ |
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70 public void put(String [] keys, Object [] values) { |
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71 Map<String, Object> top = frames.get(frames.size()-1); |
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72 for (int i = 0; i < keys.length; ++i) { |
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73 top.put(keys[i], values[i]); |
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74 } |
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75 } |
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76 |
4594 | 77 /** Check last frame (string->object map) for key. */ |
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78 public boolean containsKey(String key) { |
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79 key = key.toUpperCase(); |
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80 for (int i = frames.size()-1; i >= 0; --i) { |
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81 if (frames.get(i).containsKey(key)) { |
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82 return true; |
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83 } |
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84 } |
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85 return false; |
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86 } |
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87 |
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88 /** |
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89 * Get element (variable) key. |
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90 * Returns null if not found. |
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91 * @param key name to resolve |
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92 * @return resolution, null if not found. |
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93 */ |
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94 public Object get(String key) { |
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95 return get(key, null); |
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96 } |
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97 |
4594 | 98 /** result[0] is modified with value when true returned. |
99 * @return false if key not found in any frame. */ | |
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100 public boolean getStore(String key, Object [] result) { |
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101 |
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102 key = key.toUpperCase(); |
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103 |
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104 for (int i = frames.size()-1; i >= 0; --i) { |
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105 Map<String, Object> frame = frames.get(i); |
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106 if (frame.containsKey(key)) { |
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107 result[0] = frame.get(key); |
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108 return true; |
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109 } |
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110 } |
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111 |
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112 return false; |
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113 } |
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114 |
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115 /** |
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116 * Returns Object stored for as key, parameter def |
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StackFrames: Doc.
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117 * if not found. |
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118 */ |
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119 private 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 @Override |
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134 public Object resolveVariable(QName variableName) { |
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135 if (log.isDebugEnabled()) { |
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136 log.debug("resolve var: " + variableName); |
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137 } |
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138 return get(variableName.getLocalPart()); |
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139 } |
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140 |
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141 public String dump() { |
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142 StringBuilder sb = new StringBuilder("["); |
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143 Set<String> already = new HashSet<String>(); |
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144 |
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145 boolean first = true; |
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146 |
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147 for (int i = frames.size()-1; i >= 0; --i) { |
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148 Map<String, Object> frame = frames.get(i); |
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149 for (Map.Entry<String, Object> entry: frame.entrySet()) { |
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150 if (already.add(entry.getKey())) { |
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151 if (first) { first = false; } |
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152 else { sb.append(", "); } |
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153 sb.append('\'').append(entry.getKey()) |
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154 .append("'='").append(entry.getValue()).append('\''); |
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155 } |
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156 } |
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157 } |
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158 return sb.append(']').toString(); |
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159 } |
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160 } |
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161 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |