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annotate org.eclipse.core.jobs/src/org/eclipse/core/runtime/jobs/MultiRule.d @ 12:bc29606a740c

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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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1 /*******************************************************************************
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2 * Copyright (c) 2003, 2008 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM - Initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module org.eclipse.core.runtime.jobs.MultiRule;
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14
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15 import java.lang.all;
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16 import java.util.ArrayList;
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17 import java.util.Set;
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18
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19 import org.eclipse.core.runtime.jobs.ISchedulingRule;
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20
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21 /**
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22 * A MultiRule is a compound scheduling rule that represents a fixed group of child
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23 * scheduling rules. A MultiRule conflicts with another rule if any of its children conflict
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24 * with that rule. More formally, a compound rule represents a logical intersection
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25 * of its child rules with respect to the <code>isConflicting</code> equivalence
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26 * relation.
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27 * <p>
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28 * A MultiRule will never contain other MultiRules as children. If a MultiRule is provided
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29 * as a child, its children will be added instead.
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30 * </p>
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31 *
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32 * @since 3.0
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33 * @noextend This class is not intended to be subclassed by clients.
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34 */
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35 public class MultiRule : ISchedulingRule {
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36 private ISchedulingRule[] rules;
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37
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38 /**
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39 * Returns a scheduling rule that encompasses all provided rules. The resulting
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40 * rule may or may not be an instance of <code>MultiRule</code>. If all
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41 * provided rules are <code>null</code> then the result will be
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42 * <code>null</code>.
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43 *
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44 * @param ruleArray An array of scheduling rules, some of which may be <code>null</code>
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45 * @return a combined scheduling rule, or <code>null</code>
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46 * @since 3.1
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47 */
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48 public static ISchedulingRule combine(ISchedulingRule[] ruleArray) {
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49 ISchedulingRule result = null;
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50 for (int i = 0; i < ruleArray.length; i++) {
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51 if (ruleArray[i] is null)
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52 continue;
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53 if (result is null) {
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54 result = ruleArray[i];
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55 continue;
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56 }
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57 result = combine(result, ruleArray[i]);
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58 }
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59 return result;
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60 }
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61
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62 /**
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63 * Returns a scheduling rule that encompasses both provided rules. The resulting
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64 * rule may or may not be an instance of <code>MultiRule</code>. If both
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65 * provided rules are <code>null</code> then the result will be
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66 * <code>null</code>.
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67 *
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68 * @param rule1 a scheduling rule, or <code>null</code>
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69 * @param rule2 another scheduling rule, or <code>null</code>
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70 * @return a combined scheduling rule, or <code>null</code>
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71 */
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72 public static ISchedulingRule combine(ISchedulingRule rule1, ISchedulingRule rule2) {
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73 if (rule1 is rule2)
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74 return rule1;
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75 if (rule1 is null)
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76 return rule2;
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77 if (rule2 is null)
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78 return rule1;
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79 if (rule1.contains(rule2))
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80 return rule1;
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81 if (rule2.contains(rule1))
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82 return rule2;
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83 MultiRule result = new MultiRule();
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84 result.rules = [rule1, rule2];
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85 //make sure we don't end up with nested multi-rules
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86 if (cast(MultiRule)rule1 || cast(MultiRule)rule2 )
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87 result.rules = flatten(result.rules);
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88 return result;
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89 }
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90
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91 /*
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92 * Collapses an array of rules that may contain MultiRules into an
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93 * array in which no rules are MultiRules.
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94 */
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95 private static ISchedulingRule[] flatten(ISchedulingRule[] nestedRules) {
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96 ArrayList myRules = new ArrayList(nestedRules.length);
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97 for (int i = 0; i < nestedRules.length; i++) {
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98 if (cast(MultiRule)nestedRules[i] ) {
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99 ISchedulingRule[] children = (cast(MultiRule) nestedRules[i]).getChildren();
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100 for (int j = 0; j < children.length; j++)
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101 myRules.add(cast(Object)children[j]);
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102 } else {
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103 myRules.add(cast(Object)nestedRules[i]);
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104 }
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105 }
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106 return arraycast!(ISchedulingRule)( myRules.toArray() );
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107 }
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108
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109 /**
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110 * Creates a new scheduling rule that composes a set of nested rules.
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111 *
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112 * @param nestedRules the nested rules for this compound rule.
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113 */
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114 public this(ISchedulingRule[] nestedRules) {
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115 this.rules = flatten(nestedRules);
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116 }
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117
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118 /**
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119 * Creates a new scheduling rule with no nested rules. For
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120 * internal use only.
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121 */
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122 private this() {
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123 //to be invoked only by factory methods
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124 }
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125
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126 /**
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127 * Returns the child rules within this rule.
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128 * @return the child rules
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129 */
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130 public ISchedulingRule[] getChildren() {
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131 return rules.dup;
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132 }
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133
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134 /* (non-Javadoc)
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135 * @see org.eclipse.core.runtime.jobs.ISchedulingRule#contains(org.eclipse.core.runtime.jobs.ISchedulingRule)
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136 */
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137 public bool contains(ISchedulingRule rule) {
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138 if (this is rule)
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139 return true;
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140 if (cast(MultiRule)rule ) {
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141 ISchedulingRule[] otherRules = (cast(MultiRule) rule).getChildren();
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142 //for each child of the target, there must be some child in this rule that contains it.
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143 for (int other = 0; other < otherRules.length; other++) {
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144 bool found = false;
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145 for (int mine = 0; !found && mine < rules.length; mine++)
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146 found = rules[mine].contains(otherRules[other]);
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147 if (!found)
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148 return false;
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149 }
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150 return true;
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151 }
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152 for (int i = 0; i < rules.length; i++)
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153 if (rules[i].contains(rule))
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154 return true;
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155 return false;
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156 }
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157
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158 /* (non-Javadoc)
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159 * @see org.eclipse.core.runtime.jobs.ISchedulingRule#isConflicting(org.eclipse.core.runtime.jobs.ISchedulingRule)
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160 */
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161 public bool isConflicting(ISchedulingRule rule) {
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162 if (this is rule)
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163 return true;
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164 if (cast(MultiRule)rule ) {
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165 ISchedulingRule[] otherRules = (cast(MultiRule) rule).getChildren();
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166 for (int j = 0; j < otherRules.length; j++)
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167 for (int i = 0; i < rules.length; i++)
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168 if (rules[i].isConflicting(otherRules[j]))
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169 return true;
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170 } else {
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171 for (int i = 0; i < rules.length; i++)
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172 if (rules[i].isConflicting(rule))
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173 return true;
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174 }
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175 return false;
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176 }
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177
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178 /*
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179 * For debugging purposes only.
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180 */
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181 public String toString() {
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182 StringBuffer buffer = new StringBuffer();
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183 buffer.append("MultiRule["); //$NON-NLS-1$
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184 int last = rules.length - 1;
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185 for (int i = 0; i < rules.length; i++) {
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186 buffer.append(rules[i] ? (cast(Object)rules[i]).toString() : "null" );
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187 if (i !is last)
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188 buffer.append(',');
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189 }
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190 buffer.append(']');
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191 return buffer.toString();
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192 }
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193 }