1 | package com.framsticks.parsers; |
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2 | |
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3 | import com.framsticks.params.*; |
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4 | import org.apache.log4j.Logger; |
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5 | |
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6 | import java.io.FileNotFoundException; |
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7 | import java.io.IOException; |
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8 | import java.util.*; |
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9 | |
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10 | public class MultiParamLoader { |
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11 | private final static Logger log = Logger.getLogger(MultiParamLoader.class); |
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12 | |
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13 | /** |
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14 | * The class which name was recently found in the file, to which execution |
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15 | * should be passed. |
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16 | */ |
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17 | public AccessInterface getLastAccessInterface() { |
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18 | return lastAccessInterface; |
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19 | } |
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20 | |
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21 | /** TODO does it support multilines? */ |
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22 | /** |
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23 | * Specifies the condition to break execution. |
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24 | */ |
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25 | public enum Status { |
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26 | None, Finished, BeforeObject, AfterObject, BeforeUnknown, OnComment, OnError, Loading |
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27 | } |
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28 | |
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29 | /** |
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30 | * Specifies the action that should be taken inside loops. |
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31 | */ |
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32 | private enum LoopAction { |
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33 | Nothing, Break, Continue |
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34 | } |
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35 | |
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36 | protected AccessInterface lastAccessInterface; |
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37 | |
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38 | /** |
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39 | * Empty Param representing unknown classes - used to omit unknown |
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40 | * objects in the file. |
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41 | */ |
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42 | protected AccessInterface emptyParam = new PropertiesAccess(new FramsClass()); |
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43 | |
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44 | /** |
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45 | * Last comment found in the file. |
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46 | */ |
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47 | protected String lastComment; |
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48 | |
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49 | /** |
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50 | * Set of break conditions. |
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51 | */ |
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52 | private EnumSet<Status> breakConditions = EnumSet.of(Status.None); |
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53 | |
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54 | /** |
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55 | * Status of current execution. |
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56 | */ |
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57 | private Status status = Status.None; |
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58 | |
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59 | private void setStatus(Status status) { |
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60 | log.trace("changing status: " + this.status.toString() + " -> " + status.toString()); |
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61 | this.status = status; |
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62 | } |
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63 | |
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64 | /** |
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65 | * File from which data should be read. |
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66 | */ |
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67 | private SourceInterface currentSource; |
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68 | |
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69 | protected String currentLine; |
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70 | |
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71 | |
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72 | /** |
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73 | * All the files read by the loader (there could be many of them because of |
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74 | * '#|include'). |
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75 | */ |
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76 | private Stack<String> fileStack = new Stack<String>(); |
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77 | |
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78 | /** |
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79 | * A map that specifies connection between the getName of the file and the |
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80 | * actual reader. |
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81 | */ |
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82 | private Map<String, SourceInterface> fileMap = new HashMap<String, SourceInterface>(); |
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83 | |
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84 | /** |
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85 | * List of known classes. |
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86 | */ |
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87 | private Map<String, AccessInterface> knownParamInterfaces = new HashMap<String, AccessInterface>(); |
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88 | |
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89 | /** |
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90 | * Last unknown object found in the file. |
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91 | */ |
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92 | private String lastUnknownObjectName; |
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93 | |
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94 | /** |
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95 | * @return the currentLine |
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96 | */ |
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97 | public String getCurrentLine() { |
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98 | return currentLine; |
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99 | } |
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100 | |
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101 | public MultiParamLoader() { |
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102 | |
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103 | } |
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104 | |
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105 | /** |
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106 | * Starts reading the file. |
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107 | */ |
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108 | public Status go() throws Exception { |
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109 | log.trace("go"); |
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110 | |
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111 | while (!isFinished()) { |
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112 | // check if we are before some known or unknown object |
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113 | LoopAction loopAction = tryReadObject(); |
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114 | if (loopAction == LoopAction.Break) { |
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115 | break; |
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116 | } else if (loopAction == LoopAction.Continue) { |
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117 | continue; |
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118 | } |
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119 | |
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120 | // read data |
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121 | currentLine = currentSource.readLine(); |
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122 | |
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123 | // end of file |
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124 | if (currentLine == null) { |
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125 | if (!returnFromIncluded()) { |
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126 | finish(); |
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127 | break; |
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128 | } else { |
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129 | continue; |
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130 | } |
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131 | } |
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132 | log.trace("read line: " + currentLine); |
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133 | |
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134 | // empty line |
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135 | if (currentLine.length() == 0) { |
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136 | continue; |
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137 | } |
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138 | |
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139 | // check if some file should be included |
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140 | if (isIncludeLine(currentLine) == LoopAction.Continue) { |
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141 | continue; |
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142 | } |
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143 | |
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144 | // check if should break on comment |
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145 | if (isCommentLine(currentLine) == LoopAction.Break) { |
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146 | break; |
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147 | } |
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148 | |
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149 | // get class getName |
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150 | LoopAction action = changeCurrentParamInterface(currentLine); |
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151 | if (action == LoopAction.Break) { |
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152 | break; |
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153 | } |
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154 | if (action == LoopAction.Continue) { |
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155 | continue; |
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156 | } |
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157 | log.warn("unknown line: " + currentLine); |
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158 | } |
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159 | |
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160 | return status; |
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161 | } |
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162 | |
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163 | /** |
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164 | * Checks whether the reader found a known or unknown object and execution |
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165 | * should be passed to it. |
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166 | * @throws Exception |
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167 | */ |
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168 | private LoopAction tryReadObject() throws Exception { |
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169 | if (status == Status.BeforeObject |
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170 | || (status == Status.BeforeUnknown && lastAccessInterface != null)) { |
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171 | // found object - let it load data |
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172 | if (lastAccessInterface.getSelected() == null) { |
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173 | lastAccessInterface.select(lastAccessInterface.createAccessee()); |
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174 | } |
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175 | log.trace("loading into " + lastAccessInterface); |
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176 | lastAccessInterface.load(currentSource); |
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177 | |
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178 | if (isBreakCondition(Status.AfterObject)) { |
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179 | // break after object creation |
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180 | return LoopAction.Break; |
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181 | } |
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182 | |
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183 | return LoopAction.Continue; |
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184 | } else if (status == Status.BeforeUnknown) { |
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185 | log.warn("omitting unknown object: " + lastUnknownObjectName); |
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186 | |
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187 | // found unknown object |
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188 | emptyParam.load(currentSource); |
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189 | setStatus(Status.AfterObject); |
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190 | |
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191 | return LoopAction.Continue; |
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192 | } |
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193 | |
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194 | return LoopAction.Nothing; |
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195 | } |
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196 | |
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197 | /** |
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198 | * Checks whether some additional file shouldn't be included. |
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199 | */ |
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200 | private LoopAction isIncludeLine(String line) throws FileNotFoundException { |
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201 | try { |
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202 | // found comment |
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203 | if (line.charAt(0) == '#') { |
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204 | // maybe we should include something |
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205 | if (line.substring(1, 8).equals("include")) { |
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206 | int beg = line.indexOf('\"'); |
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207 | if (beg == -1) { |
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208 | log.info("Wanted to include some file, but the format is incorrect"); |
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209 | return LoopAction.Continue; |
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210 | } |
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211 | |
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212 | String includeFileName = line.substring(beg + 1); |
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213 | int end = includeFileName.indexOf('\"'); |
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214 | if (end == -1) { |
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215 | log.info("Wanted to include some file, but the format is incorrect"); |
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216 | return LoopAction.Continue; |
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217 | } |
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218 | |
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219 | includeFileName = includeFileName.substring(0, end); |
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220 | |
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221 | include(includeFileName); |
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222 | |
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223 | return LoopAction.Continue; |
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224 | } |
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225 | } |
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226 | } catch (IndexOutOfBoundsException ex) { |
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227 | // value after # sign is shorter than expected 7 characters - do |
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228 | // nothing |
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229 | } |
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230 | |
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231 | return LoopAction.Nothing; |
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232 | } |
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233 | |
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234 | /** |
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235 | * Checks whether execution shouldn't break on comment. |
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236 | */ |
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237 | private LoopAction isCommentLine(String line) { |
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238 | if (line.charAt(0) == '#' && isBreakCondition(Status.OnComment)) { |
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239 | // it's a simple comment - maybe we should break? |
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240 | lastComment = line; |
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241 | return LoopAction.Break; |
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242 | } |
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243 | |
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244 | return LoopAction.Nothing; |
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245 | } |
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246 | |
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247 | /** |
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248 | * Gets the getName of the class from line read from file. |
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249 | */ |
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250 | private LoopAction changeCurrentParamInterface(String line) { |
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251 | // found key - value line |
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252 | if (line.charAt(line.length() - 1) == ':') { |
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253 | String typeName = line.substring(0, line.length() - 1); |
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254 | lastAccessInterface = knownParamInterfaces.get(typeName); |
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255 | |
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256 | if (lastAccessInterface != null) { |
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257 | if (isBreakCondition(Status.BeforeObject)) { |
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258 | log.debug("breaking before object"); |
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259 | return LoopAction.Break; |
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260 | } else { |
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261 | return LoopAction.Continue; |
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262 | } |
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263 | } else { |
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264 | lastUnknownObjectName = typeName; |
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265 | if (isBreakCondition(Status.BeforeUnknown)) { |
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266 | log.debug("breaking before unknown"); |
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267 | return LoopAction.Break; |
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268 | } else { |
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269 | return LoopAction.Continue; |
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270 | } |
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271 | } |
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272 | } |
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273 | return LoopAction.Nothing; |
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274 | } |
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275 | |
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276 | /** |
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277 | * Adds another break condition. |
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278 | */ |
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279 | public void addBreakCondition(Status condition) { |
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280 | breakConditions.add(condition); |
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281 | } |
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282 | |
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283 | /** |
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284 | * Removes break condition. |
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285 | */ |
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286 | public void removeBreakCondition(Status condition) { |
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287 | breakConditions.remove(condition); |
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288 | } |
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289 | |
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290 | /** |
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291 | * Adds another class. |
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292 | */ |
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293 | public void addAccessInterface(AccessInterface accessInterface) { |
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294 | /**TODO: by id or by name? rather by id, because from file is always lowercase*/ |
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295 | knownParamInterfaces.put(accessInterface.getId(), accessInterface); |
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296 | } |
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297 | |
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298 | /** |
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299 | * Checks whether execution is finished. |
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300 | */ |
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301 | private boolean isFinished() { |
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302 | return (status == Status.Finished); |
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303 | } |
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304 | |
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305 | private void finish() { |
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306 | log.trace("finishing"); |
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307 | if (currentSource != null) { |
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308 | currentSource.close(); |
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309 | } |
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310 | |
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311 | setStatus(Status.Finished); |
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312 | } |
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313 | |
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314 | /** |
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315 | * Opens selected file. |
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316 | */ |
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317 | |
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318 | public boolean setNewSource(SourceInterface source) { |
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319 | log.debug("switching current source to " + source.getFilename() + "..."); |
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320 | |
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321 | currentSource = source; |
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322 | setStatus(Status.Loading); |
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323 | |
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324 | return true; |
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325 | } |
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326 | |
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327 | /** |
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328 | * Includes specified file. |
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329 | */ |
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330 | private void include(String includeFilename) { |
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331 | |
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332 | includeFilename = currentSource.demangleInclude(includeFilename); |
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333 | |
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334 | if (includeFilename == null) { |
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335 | return; |
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336 | } |
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337 | // check if it is already included and break if it is |
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338 | if (isAlreadyIncluded(includeFilename)) { |
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339 | log.debug("circular reference ignored (" + includeFilename |
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340 | + ")"); |
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341 | return; |
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342 | } |
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343 | |
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344 | log.info("including file " + includeFilename + "..."); |
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345 | |
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346 | SourceInterface newSource = currentSource.openInclude(includeFilename); |
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347 | if (newSource == null) { |
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348 | return; |
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349 | } |
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350 | |
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351 | fileStack.add(currentSource.getFilename()); |
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352 | fileMap.put(currentSource.getFilename(), currentSource); |
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353 | setNewSource(newSource); |
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354 | |
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355 | } |
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356 | |
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357 | /** |
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358 | * Checks whether selected file was already included. |
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359 | */ |
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360 | private boolean isAlreadyIncluded(String filename) { |
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361 | for (String file : fileStack) { |
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362 | if (filename.equals(file)) { |
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363 | log.warn("file " + filename + " was already included"); |
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364 | return true; |
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365 | } |
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366 | } |
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367 | |
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368 | return false; |
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369 | } |
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370 | |
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371 | /** |
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372 | * Returns from included file. |
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373 | */ |
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374 | private boolean returnFromIncluded() throws IOException { |
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375 | if (fileStack.size() == 0) { |
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376 | return false; |
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377 | } |
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378 | |
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379 | if (currentSource != null) { |
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380 | currentSource.close(); |
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381 | } |
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382 | |
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383 | String filename = fileStack.pop(); |
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384 | currentSource = fileMap.get(filename); |
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385 | fileMap.remove(filename); |
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386 | |
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387 | return true; |
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388 | } |
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389 | |
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390 | /** |
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391 | * Checks whether execution should break on selected condition. |
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392 | */ |
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393 | private boolean isBreakCondition(Status condition) { |
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394 | setStatus(condition); |
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395 | return breakConditions.contains(condition); |
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396 | } |
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397 | |
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398 | public Object returnObject() { |
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399 | assert lastAccessInterface != null; |
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400 | Object result = lastAccessInterface.getSelected(); |
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401 | if (result == null) { |
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402 | return null; |
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403 | } |
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404 | lastAccessInterface.select(null); |
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405 | return result; |
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406 | } |
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407 | } |
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