1 | /*
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2 | * Licensed under the Apache License, Version 2.0 (the "License");
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3 | * you may not use this file except in compliance with the License.
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4 | * You may obtain a copy of the License at
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5 | *
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6 | * http://www.apache.org/licenses/LICENSE-2.0
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7 | *
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8 | * Unless required by applicable law or agreed to in writing, software
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9 | * distributed under the License is distributed on an "AS IS" BASIS,
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10 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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11 | * See the License for the specific language governing permissions and
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12 | * limitations under the License.
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13 | */
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14 | package org.tp23.antinstaller.runtime.logic;
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15 |
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16 | import java.util.Arrays;
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17 | import java.util.Comparator;
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18 | import java.util.HashMap;
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19 | import java.util.Map;
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20 |
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21 | import org.tp23.antinstaller.input.ResultContainer;
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22 | import org.tp23.antinstaller.runtime.ConfigurationException;
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23 |
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24 | /**
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25 | * @author mwilson
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26 | * @version $Id: ExpressionBuilder.java,v 1.2 2006/12/21 00:03:18 teknopaul Exp $
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27 | * @since 0.7.4 patch 2
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28 | */
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29 | public class ExpressionBuilder {
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30 | private static final int GROUPING_START_OPERATOR = '(';
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31 |
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32 | private static final int GROUPING_END_OPERATOR = ')';
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33 |
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34 | private static final ValuesTest[] testValueConditions = {
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35 | new EndsWithTest(),
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36 | new EqualsTest(),
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37 | new GreaterThanOrEqualsTest(),
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38 | new LessThanOrEqualsTest(),
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39 | new NotEqualsTest(),
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40 | new StartsWithTest()
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41 | };
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42 |
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43 | private static final LogicalTest[] testLogicalConditions = {
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44 | new LogicalAndTest(),
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45 | new LogicalOrTest()
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46 | };
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47 |
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48 | private static final SingleExpressionTest SINGLE_EXPRESSION_TEST = new SingleExpressionTest();
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49 |
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50 | private static Map tokenMap = new HashMap();
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51 |
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52 | private static String[] valueTokens;
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53 |
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54 | private static String[] logicalTokens;
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55 |
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56 | static {
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57 | for (int i = 0; i < testValueConditions.length; i++) {
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58 | String[] tmpTokens = testValueConditions[i].getTestTokens();
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59 | for (int j = 0; j < tmpTokens.length; j++) {
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60 | tokenMap.put(tmpTokens[j], testValueConditions[i]);
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61 | }
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62 | }
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63 |
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64 | valueTokens = new String[tokenMap.size()];
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65 | int index = 0;
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66 | for (int i = 0; i < testValueConditions.length; i++) {
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67 | String[] tmpTokens = testValueConditions[i].getTestTokens();
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68 | for (int j = 0; j < tmpTokens.length; j++) {
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69 | valueTokens[index++] = tmpTokens[j];
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70 | }
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71 | }
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72 |
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73 | Comparator lengthComparator = new StringLengthComparator();
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74 |
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75 | //Have to sort so that longest test operator is checked for first
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76 | Arrays.sort(valueTokens, lengthComparator);
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77 |
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78 | index = 0;
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79 | final int mapInitialSize = tokenMap.size();
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80 |
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81 | for (int i = 0; i < testLogicalConditions.length; i++) {
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82 | String[] tmpTokens = testLogicalConditions[i].getTestTokens();
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83 | for (int j = 0; j < tmpTokens.length; j++) {
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84 | tokenMap.put(tmpTokens[j], testLogicalConditions[i]);
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85 | }
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86 | }
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87 |
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88 | logicalTokens = new String[tokenMap.size() - mapInitialSize];
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89 | for (int i = 0; i < testLogicalConditions.length; i++) {
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90 | String[] tmpTokens = testLogicalConditions[i].getTestTokens();
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91 | for (int j = 0; j < tmpTokens.length; j++) {
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92 | logicalTokens[index++] = tmpTokens[j];
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93 | }
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94 | }
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95 |
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96 | Arrays.sort(logicalTokens, lengthComparator);
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97 |
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98 | }
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99 |
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100 | public static Expression parseLogicalExpressions(ResultContainer container, String exprStr) throws ConfigurationException {
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101 | int startIndex = skipWhiteSpace(exprStr, 0);
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102 | int index = exprStr.indexOf(GROUPING_START_OPERATOR, startIndex);
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103 |
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104 | if (index == -1) {
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105 | return getSimpleExpression(container, exprStr.substring(startIndex));
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106 | }
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107 |
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108 | if (index != 0) {
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109 | throw new ConfigurationException("Illegal ifProperty value: If present, grouping operator " + GROUPING_START_OPERATOR
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110 | + " must be at start of property string");
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111 | }
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112 |
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113 | ++startIndex; //Skip over grouping operator
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114 |
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115 | int endIndex = exprStr.indexOf(GROUPING_END_OPERATOR, startIndex);
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116 |
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117 | if (endIndex == -1) {
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118 | throw new ConfigurationException("Missing closing grouping bracket " + GROUPING_END_OPERATOR + " in expression " + exprStr);
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119 | }
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120 |
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121 | //Check that this isn't an attempt tu use nested logical tests - not supported
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122 | int tstIndex = exprStr.indexOf(GROUPING_START_OPERATOR, startIndex);
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123 | if ((tstIndex != -1) && (tstIndex < endIndex)) {
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124 | throw new ConfigurationException("Nesting of logical operations is not supported: " + exprStr);
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125 | }
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126 |
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127 | try {
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128 | Expression expr1 = parseLogicalExpressions(container, exprStr.substring(startIndex, endIndex));
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129 |
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130 | LogicalTest test = null;
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131 |
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132 | startIndex = endIndex + 1;
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133 |
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134 | //Look for logical operator token
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135 | String logicalToken = getLogicalToken(exprStr, startIndex);
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136 |
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137 | for (int i = 0; i < logicalTokens.length; i++) {
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138 |
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139 | if (logicalTokens[i].compareTo(logicalToken) == 0) {
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140 | test = (LogicalTest) tokenMap.get(logicalTokens[i]);
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141 | index = exprStr.indexOf(logicalTokens[i], startIndex);
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142 | startIndex = index + logicalTokens[i].length();
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143 | break;
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144 | }
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145 | }
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146 |
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147 | if (test == null) {
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148 | return new CompoundExpression(expr1, SINGLE_EXPRESSION_TEST, null);
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149 | } else {
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150 | startIndex = skipWhiteSpace(exprStr, startIndex);
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151 | String expr2Str = exprStr.substring(startIndex, exprStr.length());
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152 | return new CompoundExpression(expr1, test, parseLogicalExpressions(container, expr2Str));
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153 |
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154 | }
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155 | } catch (Exception e) {
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156 | throw new ConfigurationException("Invalid ifProperty expression");
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157 | }
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158 | }
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159 |
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160 | private static Expression getSimpleExpression(ResultContainer resultContainer, String exprStr) throws ConfigurationException {
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161 | try {
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162 | int index = -1;
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163 | int i;
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164 |
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165 | for (i = 0; i < valueTokens.length; i++) {
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166 | index = exprStr.indexOf(valueTokens[i]);
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167 |
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168 | if (index != -1) {
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169 | break;
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170 | }
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171 | }
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172 |
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173 | return new SimpleExpression(resultContainer, exprStr.substring(0, index), (ValuesTest) tokenMap.get(valueTokens[i]), exprStr
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174 | .substring(index + valueTokens[i].length()));
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175 | } catch (Exception e) { // can be StringIndexOutOfBoundsException - PH
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176 | throw new ConfigurationException("Invalid ifProperty expression");
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177 | }
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178 | }
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179 |
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180 | private static int skipWhiteSpace(final String str, final int startIndex) {
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181 | final int strLen = str.length();
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182 | int index = startIndex;
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183 |
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184 | while (index < strLen) {
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185 | if ((str.charAt(index) != ' ') && (str.charAt(index) != '\t')) {
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186 | break;
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187 | }
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188 |
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189 | ++index;
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190 | }
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191 |
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192 | return index;
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193 | }
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194 |
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195 | private static String getLogicalToken(final String str, final int startIndex) {
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196 | final int strLen = str.length();
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197 | int tokenStart = skipWhiteSpace(str, startIndex);
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198 | int endIndex = tokenStart;
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199 |
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200 | while (endIndex < strLen) {
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201 | int chr = str.charAt(endIndex);
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202 | if ((chr == ' ') || (chr == '\t') || (chr == GROUPING_START_OPERATOR)) {
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203 | break;
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204 | }
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205 |
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206 | ++endIndex;
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207 | }
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208 |
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209 | return str.substring(tokenStart, endIndex);
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210 | }
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211 | }
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