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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/StackFrames.java @ 4914:4d1e2a0c283a dc-km-filter

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StackFrames: Doc.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 30 Jan 2013 14:32:46 +0100
parents 2970046fcdca
children bbedd9af069e
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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16
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17 /**
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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.
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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
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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
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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
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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
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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 /** 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
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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
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89 /** result[0] is modified with value when true returned.
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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 /**
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107 * Returns Object stored for as key, parameter def
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108 * if not found.
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109 */
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110 private Object get(String key, Object def) {
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111
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112 key = key.toUpperCase();
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113
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114 for (int i = frames.size()-1; i >= 0; --i) {
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115 Map<String, Object> frame = frames.get(i);
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116 if (frame.containsKey(key)) {
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117 return frame.get(key);
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118 }
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119 }
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120
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121 return def;
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122 }
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123
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124 @Override
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125 public Object resolveVariable(QName variableName) {
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126 if (log.isDebugEnabled()) {
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127 log.debug("resolve var: " + variableName);
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128 }
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129 return get(variableName.getLocalPart());
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130 }
1023
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131
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132 public String dump() {
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133 StringBuilder sb = new StringBuilder("[");
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134 Set<String> already = new HashSet<String>();
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135
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136 boolean first = true;
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137
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138 for (int i = frames.size()-1; i >= 0; --i) {
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139 Map<String, Object> frame = frames.get(i);
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140 for (Map.Entry<String, Object> entry: frame.entrySet()) {
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141 if (already.add(entry.getKey())) {
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142 if (first) { first = false; }
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143 else { sb.append(", "); }
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144 sb.append('\'').append(entry.getKey())
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145 .append("'='").append(entry.getValue()).append('\'');
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146 }
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147 }
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148 }
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149 return sb.append(']').toString();
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150 }
998
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151 }
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152 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org