Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/CompiledStatement.java @ 1023:5cb84ceee2a0

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Datacage: Templates now can nest <dc:elements> into other elements in the body of <dc:context> flys-artifacts/trunk@2481 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 10 Aug 2011 10:08:01 +0000
parents aca3b46160cb
children 94df49614d92
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.regex.Pattern;
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4 import java.util.regex.Matcher;
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5
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6 import java.util.List;
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7 import java.util.Map;
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8 import java.util.TreeMap;
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9 import java.util.ArrayList;
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10
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11 import java.sql.PreparedStatement;
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12 import java.sql.SQLException;
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13 import java.sql.Connection;
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14 import java.sql.ResultSet;
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15
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16 import net.sf.ehcache.Cache;
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17 import net.sf.ehcache.Element;
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18
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19 import de.intevation.flys.artifacts.cache.CacheFactory;
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20
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21 import org.apache.log4j.Logger;
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22
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23 public class CompiledStatement
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24 {
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25 private static Logger log = Logger.getLogger(CompiledStatement.class);
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26
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27 public static final String DATACAGE_DB_CACHE =
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28 "datacage.db";
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29
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30 public static final Pattern VAR =
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31 Pattern.compile("\\$\\{([a-zA-Z0-9_-]+)\\}");
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32
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33 protected String original;
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34 protected String statement;
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35
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36 protected Map<String, List<Integer>> positions;
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37
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38 protected int numVars;
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39
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40 public class Instance {
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41
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42 protected PreparedStatement preparedStatement;
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43
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44 public Instance() {
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45 }
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46
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47 protected ResultData executeCached(
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48 Cache cache,
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49 Connection connection,
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50 StackFrames frames
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51 )
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52 throws SQLException
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53 {
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54 log.debug("executeCached");
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55 Object [] values = new Object[numVars];
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56
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57 StringBuilder sb = new StringBuilder(original);
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58
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59 for (Map.Entry<String, List<Integer>> entry: positions.entrySet()) {
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60 String key = entry.getKey();
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61 Object value = frames.get(key);
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62 sb.append(';').append(key).append(':').append(value);
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63 for (Integer index: entry.getValue()) {
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64 values[index] = value;
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65 }
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66 }
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67
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68 // XXX: Maybe too many collisions?
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69 // String key = original + Arrays.hashCode(values);
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70 String key = sb.toString();
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71
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72 Element element = cache.get(key);
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73
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74 if (element != null) {
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75 return (ResultData)element.getValue();
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76 }
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77
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78 if (preparedStatement == null) {
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79 preparedStatement = connection.prepareStatement(statement);
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80 }
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81
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82 for (int i = 0; i < values.length; ++i) {
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83 preparedStatement.setObject(i+1, values[i]);
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84 }
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85
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86 ResultData data;
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87
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88 ResultSet result = preparedStatement.executeQuery();
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89 try {
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90 data = new ResultData(preparedStatement.getMetaData())
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91 .addAll(result);
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92 }
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93 finally {
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94 result.close();
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95 }
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96
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97 element = new Element(key, data);
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98 cache.put(element);
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99
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100 return data;
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101 }
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102
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103 protected ResultData executeUncached(
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104 Connection connection,
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105 StackFrames frames
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106 )
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107 throws SQLException
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108 {
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109 log.debug("executeUncached");
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110 if (preparedStatement == null) {
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111 if (log.isDebugEnabled()) {
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112 log.debug("preparing statement: " + statement);
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113 }
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114 preparedStatement = connection.prepareStatement(statement);
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115 }
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116
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117 for (Map.Entry<String, List<Integer>> entry: positions.entrySet()) {
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118 Object value = frames.get(entry.getKey());
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119 for (Integer index: entry.getValue()) {
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120 preparedStatement.setObject(index+1, value);
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121 }
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122 }
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123
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124 ResultSet result = preparedStatement.executeQuery();
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125 try {
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126 return new ResultData(preparedStatement.getMetaData())
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127 .addAll(result);
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128 }
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129 finally {
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130 result.close();
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131 }
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132 }
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133
1011
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134 public ResultData execute(
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135 Connection connection,
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136 StackFrames frames,
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137 boolean cached
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138 )
998
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139 throws SQLException
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140 {
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141 if (!cached) {
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142 return executeUncached(connection, frames);
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143 }
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144
998
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145 Cache cache = CacheFactory.getCache(DATACAGE_DB_CACHE);
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146
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147 return cache != null
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148 ? executeCached(cache, connection, frames)
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149 : executeUncached(connection, frames);
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150 }
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151
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152 public void close() {
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153 if (preparedStatement != null) {
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154 try {
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155 preparedStatement.close();
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156 }
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157 catch (SQLException sqle) {
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158 }
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159 preparedStatement = null;
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160 }
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161 }
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162 } // class Instance
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163
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164 public CompiledStatement() {
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165 }
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166
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167 public CompiledStatement(String original) {
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168 this.original = original;
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169 // TreeMap to ensure order
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170 positions = new TreeMap<String, List<Integer>>();
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171 compile();
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172 }
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173
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174 protected void compile() {
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175
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176 StringBuffer sb = new StringBuffer();
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177
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178 Matcher m = VAR.matcher(original);
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179
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180 int index = 0;
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181
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182 while (m.find()) {
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183 String key = m.group(1);
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184 List<Integer> indices = positions.get(key);
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185 if (indices == null) {
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186 indices = new ArrayList<Integer>();
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187 positions.put(key, indices);
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188 }
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189 indices.add(index);
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190 m.appendReplacement(sb, "?");
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191 ++index;
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192 }
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193
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194 m.appendTail(sb);
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195
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196 numVars = index;
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197
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198 statement = sb.toString();
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199 }
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200
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201 public String getStatement() {
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202 return statement;
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203 }
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204 }
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205 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org