Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/CompiledStatement.java @ 4496:d8992459b408

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Add method to return the facets of an artifact This methos should be used to get the facets of an artifact instead of accessing the facets member variable directly.
author Björn Ricks <bjoern.ricks@intevation.de>
date Wed, 14 Nov 2012 11:11:04 +0100
parents 5642a83420f2
children c1df0dac140b
rev   line source
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b81626b10cb7 Datacage: Moved templating in a better suited package.
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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 if (log.isDebugEnabled()) {
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89 log.debug("executing: " + statement);
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90 }
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91
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92 ResultSet result = preparedStatement.executeQuery();
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93 try {
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94 data = new ResultData(preparedStatement.getMetaData())
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95 .addAll(result);
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96 }
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97 finally {
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98 result.close();
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99 }
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100
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101 element = new Element(key, data);
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102 cache.put(element);
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103
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104 return data;
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105 }
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106
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107 protected ResultData executeUncached(
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108 Connection connection,
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109 StackFrames frames
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110 )
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111 throws SQLException
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112 {
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113 log.debug("executeUncached");
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114 if (preparedStatement == null) {
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115 if (log.isDebugEnabled()) {
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116 log.debug("preparing statement: " + statement);
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117 }
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118 preparedStatement = connection.prepareStatement(statement);
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119 }
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120
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121 for (Map.Entry<String, List<Integer>> entry: positions.entrySet()) {
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122 Object value = frames.get(entry.getKey());
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123 for (Integer index: entry.getValue()) {
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124 preparedStatement.setObject(index+1, value);
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125 }
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126 }
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127
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128 if (log.isDebugEnabled()) {
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129 log.debug("executing: " + statement);
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130 }
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131
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132 ResultSet result = preparedStatement.executeQuery();
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133 try {
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134 return new ResultData(preparedStatement.getMetaData())
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135 .addAll(result);
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136 }
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137 finally {
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138 result.close();
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139 }
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140 }
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141
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142 public ResultData execute(
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143 Connection connection,
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144 StackFrames frames,
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145 boolean cached
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146 )
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147 throws SQLException
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148 {
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149 if (!cached) {
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150 return executeUncached(connection, frames);
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151 }
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152
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153 Cache cache = CacheFactory.getCache(DATACAGE_DB_CACHE);
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154
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155 return cache != null
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156 ? executeCached(cache, connection, frames)
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157 : executeUncached(connection, frames);
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158 }
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159
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160 public void close() {
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161 if (preparedStatement != null) {
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162 try {
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163 preparedStatement.close();
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164 }
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165 catch (SQLException sqle) {
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166 }
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167 preparedStatement = null;
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168 }
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169 }
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170 } // class Instance
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171
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172 public CompiledStatement() {
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173 }
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174
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175 public CompiledStatement(String original) {
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176 this.original = original;
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177 // TreeMap to ensure order
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178 positions = new TreeMap<String, List<Integer>>();
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179 compile();
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180 }
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181
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182 protected void compile() {
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183
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184 StringBuffer sb = new StringBuffer();
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185
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186 Matcher m = VAR.matcher(original);
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187
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188 int index = 0;
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189
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190 while (m.find()) {
1716
3ca999f507b7 flys/issue314: Variables in datacage are now case insensitive.
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parents: 1097
diff changeset
191 String key = m.group(1).toUpperCase();
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192 List<Integer> indices = positions.get(key);
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193 if (indices == null) {
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194 indices = new ArrayList<Integer>();
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diff changeset
195 positions.put(key, indices);
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196 }
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197 indices.add(index);
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diff changeset
198 m.appendReplacement(sb, "?");
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diff changeset
199 ++index;
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diff changeset
200 }
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201
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202 m.appendTail(sb);
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203
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204 numVars = index;
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205
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diff changeset
206 statement = sb.toString();
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diff changeset
207 }
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208
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diff changeset
209 public String getStatement() {
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210 return statement;
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diff changeset
211 }
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212 }
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diff changeset
213 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org