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annotate artifacts/src/main/java/org/dive4elements/river/artifacts/datacage/templating/CompiledStatement.java @ 5838:5aa05a7a34b7

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Rename modules to more fitting names.
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 15:23:37 +0200
parents flys-artifacts/src/main/java/org/dive4elements/river/artifacts/datacage/templating/CompiledStatement.java@bd047b71ab37
children 4897a58c8746
rev   line source
5831
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1 package org.dive4elements.river.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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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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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 org.dive4elements.river.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 /** SQL Statement, create PreparedStatement. */
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24 public class CompiledStatement
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25 {
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26 private static Logger log = Logger.getLogger(CompiledStatement.class);
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27
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28 public static final String DATACAGE_DB_CACHE =
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29 "datacage.db";
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30
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31 public static final Pattern VAR =
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32 Pattern.compile("\\$\\{([a-zA-Z0-9_-]+)\\}");
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33
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34 protected String original;
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35 protected String statement;
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36
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37 protected Map<String, List<Integer>> positions;
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38
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39 protected int numVars;
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40
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41 public class Instance {
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42
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43 protected PreparedStatement preparedStatement;
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44
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45 public Instance() {
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46 }
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47
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48 /** Executes a Statement. */
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49 protected ResultData executeCached(
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50 Cache cache,
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51 Connection connection,
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52 StackFrames frames
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53 )
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54 throws SQLException
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55 {
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56 log.debug("executeCached");
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57 Object [] values = new Object[numVars];
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58
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59 StringBuilder sb = new StringBuilder(original);
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60
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61 for (Map.Entry<String, List<Integer>> entry: positions.entrySet()) {
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62 String key = entry.getKey();
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63 Object value = frames.get(key);
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64 sb.append(';').append(key).append(':').append(value);
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65 for (Integer index: entry.getValue()) {
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66 values[index] = value;
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67 }
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68 }
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69
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70 // XXX: Maybe too many collisions?
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71 // String key = original + Arrays.hashCode(values);
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72 String key = sb.toString();
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73
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74 Element element = cache.get(key);
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75
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76 if (element != null) {
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77 return (ResultData)element.getValue();
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78 }
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79
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80 if (preparedStatement == null) {
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81 preparedStatement = connection.prepareStatement(statement);
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82 }
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83
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84 for (int i = 0; i < values.length; ++i) {
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85 preparedStatement.setObject(i+1, values[i]);
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86 }
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87
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88 ResultData data;
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89
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90 if (log.isDebugEnabled()) {
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91 log.debug("executing: " + statement);
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92 }
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93
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94 ResultSet result = preparedStatement.executeQuery();
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95 try {
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96 data = new ResultData(preparedStatement.getMetaData())
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97 .addAll(result);
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98 }
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99 finally {
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100 result.close();
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101 }
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102
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103 element = new Element(key, data);
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104 cache.put(element);
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105
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106 return data;
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107 }
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108
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109 protected ResultData executeUncached(
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110 Connection connection,
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111 StackFrames frames
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112 )
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113 throws SQLException
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114 {
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115 log.debug("executeUncached");
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116 if (preparedStatement == null) {
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117 if (log.isDebugEnabled()) {
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118 log.debug("preparing statement: " + statement);
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119 }
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120 preparedStatement = connection.prepareStatement(statement);
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121 }
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122
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123 for (Map.Entry<String, List<Integer>> entry: positions.entrySet()) {
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124 Object value = frames.get(entry.getKey());
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125 for (Integer index: entry.getValue()) {
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126 preparedStatement.setObject(index+1, value);
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127 }
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128 }
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129
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130 if (log.isDebugEnabled()) {
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131 log.debug("executing: " + statement);
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132 }
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133
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134 ResultSet result = preparedStatement.executeQuery();
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135 try {
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136 return new ResultData(preparedStatement.getMetaData())
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137 .addAll(result);
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138 }
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139 finally {
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140 result.close();
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141 }
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142 }
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143
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144 public ResultData execute(
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145 Connection connection,
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146 StackFrames frames,
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147 boolean cached
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148 )
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149 throws SQLException
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150 {
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151 if (!cached) {
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152 return executeUncached(connection, frames);
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153 }
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154
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155 Cache cache = CacheFactory.getCache(DATACAGE_DB_CACHE);
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156
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157 return cache != null
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158 ? executeCached(cache, connection, frames)
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159 : executeUncached(connection, frames);
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160 }
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161
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162 public void close() {
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163 if (preparedStatement != null) {
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164 try {
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165 preparedStatement.close();
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166 }
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167 catch (SQLException sqle) {
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168 }
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169 preparedStatement = null;
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170 }
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171 }
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172 } // class Instance
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173
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174 public CompiledStatement() {
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175 }
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176
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177 public CompiledStatement(String original) {
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178 this.original = original;
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179 // TreeMap to ensure order
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180 positions = new TreeMap<String, List<Integer>>();
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181 compile();
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182 }
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183
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184 protected void compile() {
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185
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186 StringBuffer sb = new StringBuffer();
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187
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188 Matcher m = VAR.matcher(original);
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189
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190 int index = 0;
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191
4805
722b4962e30e Comment/doc.
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192 // Find variables like ${varname}.
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193 while (m.find()) {
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3ca999f507b7 flys/issue314: Variables in datacage are now case insensitive.
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194 String key = m.group(1).toUpperCase();
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195 List<Integer> indices = positions.get(key);
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196 if (indices == null) {
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197 indices = new ArrayList<Integer>();
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198 positions.put(key, indices);
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199 }
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200 indices.add(index);
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201 m.appendReplacement(sb, "?");
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202 ++index;
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203 }
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204
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205 m.appendTail(sb);
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206
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207 numVars = index;
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208
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209 statement = sb.toString();
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210 }
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211
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212 public String getStatement() {
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213 return statement;
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214 }
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215 }
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216 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org