Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/CompiledStatement.java @ 4615:c1df0dac140b

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author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Mon, 03 Dec 2012 10:51:49 +0100
parents 5642a83420f2
children 722b4962e30e
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 /** 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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48 protected ResultData executeCached(
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49 Cache cache,
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50 Connection connection,
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51 StackFrames frames
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52 )
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53 throws SQLException
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54 {
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55 log.debug("executeCached");
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56 Object [] values = new Object[numVars];
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57
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58 StringBuilder sb = new StringBuilder(original);
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59
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60 for (Map.Entry<String, List<Integer>> entry: positions.entrySet()) {
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61 String key = entry.getKey();
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62 Object value = frames.get(key);
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63 sb.append(';').append(key).append(':').append(value);
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64 for (Integer index: entry.getValue()) {
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65 values[index] = value;
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66 }
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67 }
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68
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69 // XXX: Maybe too many collisions?
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70 // String key = original + Arrays.hashCode(values);
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71 String key = sb.toString();
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72
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73 Element element = cache.get(key);
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74
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75 if (element != null) {
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76 return (ResultData)element.getValue();
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77 }
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78
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79 if (preparedStatement == null) {
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80 preparedStatement = connection.prepareStatement(statement);
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81 }
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82
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83 for (int i = 0; i < values.length; ++i) {
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84 preparedStatement.setObject(i+1, values[i]);
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85 }
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86
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87 ResultData data;
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88
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89 if (log.isDebugEnabled()) {
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90 log.debug("executing: " + statement);
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91 }
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92
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93 ResultSet result = preparedStatement.executeQuery();
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94 try {
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95 data = new ResultData(preparedStatement.getMetaData())
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96 .addAll(result);
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97 }
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98 finally {
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99 result.close();
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100 }
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101
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102 element = new Element(key, data);
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103 cache.put(element);
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104
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105 return data;
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106 }
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107
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108 protected ResultData executeUncached(
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109 Connection connection,
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110 StackFrames frames
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111 )
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112 throws SQLException
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113 {
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114 log.debug("executeUncached");
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115 if (preparedStatement == null) {
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116 if (log.isDebugEnabled()) {
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117 log.debug("preparing statement: " + statement);
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118 }
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119 preparedStatement = connection.prepareStatement(statement);
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120 }
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121
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122 for (Map.Entry<String, List<Integer>> entry: positions.entrySet()) {
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123 Object value = frames.get(entry.getKey());
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124 for (Integer index: entry.getValue()) {
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125 preparedStatement.setObject(index+1, value);
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126 }
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127 }
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128
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129 if (log.isDebugEnabled()) {
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130 log.debug("executing: " + statement);
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131 }
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132
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133 ResultSet result = preparedStatement.executeQuery();
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134 try {
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135 return new ResultData(preparedStatement.getMetaData())
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136 .addAll(result);
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137 }
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138 finally {
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139 result.close();
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140 }
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141 }
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142
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143 public ResultData execute(
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144 Connection connection,
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145 StackFrames frames,
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146 boolean cached
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147 )
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148 throws SQLException
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149 {
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150 if (!cached) {
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151 return executeUncached(connection, frames);
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152 }
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153
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154 Cache cache = CacheFactory.getCache(DATACAGE_DB_CACHE);
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155
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156 return cache != null
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157 ? executeCached(cache, connection, frames)
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158 : executeUncached(connection, frames);
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159 }
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160
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161 public void close() {
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162 if (preparedStatement != null) {
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163 try {
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164 preparedStatement.close();
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165 }
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166 catch (SQLException sqle) {
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167 }
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168 preparedStatement = null;
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169 }
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170 }
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171 } // class Instance
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172
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173 public CompiledStatement() {
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174 }
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175
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176 public CompiledStatement(String original) {
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177 this.original = original;
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178 // TreeMap to ensure order
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179 positions = new TreeMap<String, List<Integer>>();
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180 compile();
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181 }
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182
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183 protected void compile() {
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184
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185 StringBuffer sb = new StringBuffer();
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186
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187 Matcher m = VAR.matcher(original);
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188
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189 int index = 0;
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190
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191 while (m.find()) {
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3ca999f507b7 flys/issue314: Variables in datacage are now case insensitive.
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192 String key = m.group(1).toUpperCase();
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193 List<Integer> indices = positions.get(key);
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194 if (indices == null) {
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195 indices = new ArrayList<Integer>();
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196 positions.put(key, indices);
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197 }
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198 indices.add(index);
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199 m.appendReplacement(sb, "?");
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diff changeset
200 ++index;
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201 }
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202
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203 m.appendTail(sb);
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204
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205 numVars = index;
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206
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207 statement = sb.toString();
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208 }
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209
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210 public String getStatement() {
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211 return statement;
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212 }
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213 }
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214 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org