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annotate dwt/custom/StyleRange.d @ 0:380af2bdd8e5

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Upload of whole dwt tree
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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children 1a8b3cb347e0
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2007 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 Corporation - initial API and implementation
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10 *******************************************************************************/
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11 module dwt.custom;
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12
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13 import dwt.*;
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14 import dwt.graphics.*;
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15 import dwt.internal.CloneableCompatibility;
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16
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17 public class StyleRange : TextStyle : CloneableCompatibility {
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18
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19 /**
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20 * the start offset of the range, zero-based from the document start
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21 */
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22 public int start;
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23
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24 /**
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25 * the length of the range
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26 */
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27 public int length;
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28
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29 /**
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30 * the font style of the range. It may be a combination of
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31 * DWT.NORMAL, DWT.ITALIC or DWT.BOLD
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32 *
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33 * Note: the font style is not used if the <code>font</code> attribute
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34 * is set
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35 */
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36 public int fontStyle = DWT.NORMAL;
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37
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38 /**
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39 * Create a new style range with no styles
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40 *
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41 * @since 3.2
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42 */
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43 public StyleRange() {
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44 }
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45
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46 /**
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47 * Create a new style range from an existing text style.
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48 *
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49 *@param style the text style to copy
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50 *
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51 *@since 3.4
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52 */
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53 public StyleRange(TextStyle style) {
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54 super(style);
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55 }
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56
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57 /**
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58 * Create a new style range.
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59 *
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60 * @param start start offset of the style
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61 * @param length length of the style
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62 * @param foreground foreground color of the style, null if none
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63 * @param background background color of the style, null if none
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64 */
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65 public StyleRange(int start, int length, Color foreground, Color background) {
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66 super(null, foreground, background);
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67 this.start = start;
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68 this.length = length;
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69 }
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70
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71 /**
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72 * Create a new style range.
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73 *
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74 * @param start start offset of the style
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75 * @param length length of the style
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76 * @param foreground foreground color of the style, null if none
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77 * @param background background color of the style, null if none
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78 * @param fontStyle font style of the style, may be DWT.NORMAL, DWT.ITALIC or DWT.BOLD
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79 */
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80 public StyleRange(int start, int length, Color foreground, Color background, int fontStyle) {
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81 this(start, length, foreground, background);
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82 this.fontStyle = fontStyle;
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83 }
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84
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85 /**
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86 * Compares the argument to the receiver, and returns true
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87 * if they represent the <em>same</em> object using a class
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88 * specific comparison.
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89 *
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90 * @param object the object to compare with this object
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91 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
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92 *
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93 * @see #toHash()
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94 */
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95 public bool opEquals(Object object) {
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96 if (object is this) return true;
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97 if (object instanceof StyleRange) {
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98 StyleRange style = (StyleRange)object;
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99 if (start !is style.start) return false;
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100 if (length !is style.length) return false;
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101 return similarTo(style);
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102 }
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103 return false;
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104 }
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105
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106 /**
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107 * Returns an integer hash code for the receiver. Any two
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108 * objects that return <code>true</code> when passed to
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109 * <code>opEquals</code> must return the same value for this
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110 * method.
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111 *
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112 * @return the receiver's hash
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113 *
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114 * @see #opEquals(Object)
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115 */
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116 public int toHash() {
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117 return super.toHash() ^ fontStyle;
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118 }
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119 bool isVariableHeight() {
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120 return font !is null || metrics !is null || rise !is 0;
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121 }
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122 /**
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123 * Returns whether or not the receiver is unstyled (i.e., does not have any
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124 * style attributes specified).
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125 *
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126 * @return true if the receiver is unstyled, false otherwise.
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127 */
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128 public bool isUnstyled() {
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129 if (font !is null) return false;
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130 if (rise !is 0) return false;
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131 if (metrics !is null) return false;
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132 if (foreground !is null) return false;
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133 if (background !is null) return false;
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134 if (fontStyle !is DWT.NORMAL) return false;
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135 if (underline) return false;
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136 if (strikeout) return false;
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137 if (borderStyle !is DWT.NONE) return false;
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138 return true;
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139 }
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140
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141 /**
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142 * Compares the specified object to this StyleRange and answer if the two
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143 * are similar. The object must be an instance of StyleRange and have the
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144 * same field values for except for start and length.
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145 *
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146 * @param style the object to compare with this object
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147 * @return true if the objects are similar, false otherwise
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148 */
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149 public bool similarTo(StyleRange style) {
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150 if (!super.opEquals(style)) return false;
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151 if (fontStyle !is style.fontStyle) return false;
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152 return true;
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153 }
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154
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155 /**
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156 * Returns a new StyleRange with the same values as this StyleRange.
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157 *
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158 * @return a shallow copy of this StyleRange
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159 */
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160 public Object clone() {
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161 try {
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162 return super.clone();
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163 } catch (CloneNotSupportedException e) {
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164 return null;
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165 }
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166 }
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167
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168 /**
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169 * Returns a String containing a concise, human-readable
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170 * description of the receiver.
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171 *
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172 * @return a String representation of the StyleRange
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173 */
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174 public String toString() {
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175 StringBuffer buffer = new StringBuffer();
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176 buffer.append("StyleRange {");
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177 buffer.append(start);
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178 buffer.append(", ");
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179 buffer.append(length);
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180 buffer.append(", fontStyle=");
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181 switch (fontStyle) {
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182 case DWT.BOLD:
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183 buffer.append("bold");
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184 break;
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185 case DWT.ITALIC:
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186 buffer.append("italic");
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187 break;
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188 case DWT.BOLD | DWT.ITALIC:
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189 buffer.append("bold-italic");
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190 break;
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191 default:
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192 buffer.append("normal");
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193 }
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194 String str = super.toString();
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195 int index = str.indexOf('{');
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196 str = str.substring(index + 1);
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197 if (str.length() > 1) buffer.append(", ");
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198 buffer.append(str);
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199 return buffer.toString();
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200 }
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201 }