Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/datacage/templating/StackFrames.java @ 9801:1d7a72a50183 3.2.x tip

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Assume Compose V2, consistently
author Tom Gottfried <tom@intevation.de>
date Thu, 23 Nov 2023 10:14:13 +0100
parents 0a5239a1e46e
children
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.logging.log4j.Logger;
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23 import org.apache.logging.log4j.LogManager;
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24
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25
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26 /**
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27 * Maintains stack of 'frames' which are maps from string to object.
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28 * Used for variables in datacage/meta-data system.
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29 */
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30 public class StackFrames
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31 implements XPathVariableResolver
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32 {
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33 private static Logger log = LogManager.getLogger(StackFrames.class);
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34
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35 public static final Object NULL = new Object() {
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36 @Override
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37 public String toString() {
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38 return "";
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39 }
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40 };
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41
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42 /** The frames (used like a stack). */
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43 protected List<Map<String, Object>> frames;
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44
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45 public StackFrames() {
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46 frames = new ArrayList<Map<String, Object>>();
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47 }
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48
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49 public StackFrames(Map<String, Object> initialFrame) {
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50 this();
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51 if (initialFrame != null) {
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52 frames.add(new HashMap<String, Object>(initialFrame));
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53 }
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54 }
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55
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56 /** Push a new String->Object map. */
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57 public void enter() {
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58 frames.add(new HashMap<String, Object>());
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59 }
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60
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61 /** Pop/Remove last String->Object map. */
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62 public void leave() {
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63 frames.remove(frames.size()-1);
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64 }
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65
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66 /** Put Key/Value in last String->Object map. */
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67 public void put(String key, Object value) {
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68 int N = frames.size();
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69 if (N > 0) {
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70 frames.get(N-1).put(key, value);
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71 }
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72 }
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73
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74 /** Put multiple Key/Values in last String->Object map. */
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75 public void put(String [] keys, Object [] values) {
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76 Map<String, Object> top = frames.get(frames.size()-1);
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77 for (int i = 0; i < keys.length; ++i) {
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78 top.put(keys[i], values[i]);
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79 }
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80 }
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81
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82 /** Check last frame (string->object map) for key. */
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83 public boolean containsKey(String key) {
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84 key = key.toUpperCase();
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85 for (int i = frames.size()-1; i >= 0; --i) {
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86 if (frames.get(i).containsKey(key)) {
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87 return true;
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88 }
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89 }
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90 return false;
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91 }
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92
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93 /**
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94 * Get element (variable) key.
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95 * Returns null if not found.
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96 * @param key name to resolve
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97 * @return resolution, null if not found.
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98 */
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99 public Object get(String key) {
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100 return get(key, null);
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101 }
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102
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103 /** result[0] is modified with value when true returned.
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104 * @return false if key not found in any frame. */
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105 public boolean getStore(String key, Object [] result) {
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106
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107 key = key.toUpperCase();
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108
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109 for (int i = frames.size()-1; i >= 0; --i) {
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110 Map<String, Object> frame = frames.get(i);
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111 if (frame.containsKey(key)) {
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112 result[0] = frame.get(key);
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113 return true;
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114 }
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115 }
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116
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117 return false;
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118 }
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119
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120 public Object get(String key, Object def) {
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121
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122 key = key.toUpperCase();
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123
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124 for (int i = frames.size()-1; i >= 0; --i) {
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125 Map<String, Object> frame = frames.get(i);
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126 if (frame.containsKey(key)) {
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127 return frame.get(key);
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128 }
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129 }
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130
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131 return def;
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132 }
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133
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134 public Object getNull(String key) {
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135 return getNull(key, null);
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136 }
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137
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138 public Object getNull(String key, Object def) {
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139
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140 key = key.toUpperCase();
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141
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142 for (int i = frames.size()-1; i >= 0; --i) {
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143 Map<String, Object> frame = frames.get(i);
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144 if (frame.containsKey(key)) {
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145 Object value = frame.get(key);
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146 return value != null ? value : NULL;
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147 }
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148 }
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149
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150 return def;
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151 }
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152
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153 @Override
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154 public Object resolveVariable(QName variableName) {
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155 /*
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156 if (log.isDebugEnabled()) {
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157 log.debug("resolve var: " + variableName);
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158 }
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159 */
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160
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161 return getNull(variableName.getLocalPart());
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162 }
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163
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164 public String dump() {
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165 StringBuilder sb = new StringBuilder("[");
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166 Set<String> already = new HashSet<String>();
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167
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168 boolean first = true;
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169
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170 for (int i = frames.size()-1; i >= 0; --i) {
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171 Map<String, Object> frame = frames.get(i);
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172 for (Map.Entry<String, Object> entry: frame.entrySet()) {
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173 if (already.add(entry.getKey())) {
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174 if (first) { first = false; }
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175 else { sb.append(", "); }
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176 if (sb.length() - sb.lastIndexOf("\n") > 80) {
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177 sb.append("\n");
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178 }
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179 sb.append('\'').append(entry.getKey())
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180 .append("'='").append(entry.getValue()).append('\'');
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181 }
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182 }
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183 }
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184 return sb.append(']').toString();
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185 }
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186 }
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187 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org