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annotate dwtx/draw2d/DefaultRangeModel.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 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 * 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 dwtx.draw2d.DefaultRangeModel;
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14
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15 import dwt.dwthelper.utils;
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16 import dwtx.dwtxhelper.Bean;
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17 import tango.text.convert.Format;
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18
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19 import dwtx.draw2d.RangeModel;
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20
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21 /**
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22 * Generic implementation for a RangeModel.
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23 *
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24 *
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25 *<pre>
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26 * |<----extent--->|
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27 * ----|-----------|---------------|---------------|----
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28 * min | max
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29 * value
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30 * </pre>
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31 */
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32 public class DefaultRangeModel
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33 : RangeModel
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34 {
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35
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36 /**
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37 * Listeners interested in the range model's property changes.
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38 */
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39 protected PropertyChangeSupport propertyListeners;
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40 private int minimum = 0;
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41 private int maximum = 100;
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42 private int extent = 20;
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43 private int value = 0;
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44
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45 public this(){
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46 propertyListeners = new PropertyChangeSupport(this);
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47 }
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48
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49 /**
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50 * Registers the given listener as a PropertyChangeListener.
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51 *
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52 * @param listener the listener to be added
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53 * @since 2.0
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54 */
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55 public void addPropertyChangeListener(PropertyChangeListener listener) {
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56 propertyListeners.addPropertyChangeListener(listener);
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57 }
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58
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59 /**
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60 * Notifies any listening PropertyChangeListeners that the property with the given id has
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61 * changed.
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62 *
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63 * @param string the property name
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64 * @param oldValue the old value
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65 * @param newValue the new value
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66 * @since 2.0
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67 */
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68 protected void firePropertyChange(String string, int oldValue, int newValue) {
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69 propertyListeners.firePropertyChange(string, oldValue, newValue);
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70 }
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71
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72 /**
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73 * @return the extent
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74 */
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75 public int getExtent() {
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76 return extent;
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77 }
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78
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79 /**
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80 * @return the maximum value
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81 */
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82 public int getMaximum() {
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83 return maximum;
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84 }
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85
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86 /**
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87 * @return the minimum value
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88 */
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89 public int getMinimum() {
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90 return minimum;
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91 }
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92
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93 /**
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94 * @return the current value
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95 */
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96 public int getValue() {
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97 return value;
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98 }
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99
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100 /**
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101 * @return whether the extent is between the minimum and maximum values
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102 */
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103 public bool isEnabled() {
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104 return (getMaximum() - getMinimum()) > getExtent();
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105 }
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106
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107 /**
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108 * Removes the given PropertyChangeListener from the list of listeners.
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109 *
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110 * @param listener the listener to be removed
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111 */
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112 public void removePropertyChangeListener(PropertyChangeListener listener) {
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113 propertyListeners.removePropertyChangeListener(listener);
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114 }
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115
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116 /**
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117 * @see dwtx.draw2d.RangeModel#setAll(int, int, int)
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118 */
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119 public void setAll(int min, int ext, int max) {
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120 int oldMin = minimum;
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121 int oldExtent = extent;
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122 int oldMax = maximum;
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123 maximum = max;
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124 minimum = min;
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125 extent = ext;
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126 if (oldMax !is max)
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127 firePropertyChange(PROPERTY_MAXIMUM, oldMax, max);
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128 if (oldExtent !is ext)
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129 firePropertyChange(PROPERTY_EXTENT, oldExtent, ext);
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130 if (oldMin !is min)
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131 firePropertyChange(PROPERTY_MINIMUM, oldMin, min);
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132 setValue(getValue());
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133 }
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134
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135 /**
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136 * Sets this RangeModel's extent and fires a property change if the given value is
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137 * different from the current extent.
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138 *
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139 * @param extent the new extent value
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140 */
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141 public void setExtent(int extent) {
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142 if (this.extent is extent)
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143 return;
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144 int oldValue = this.extent;
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145 this.extent = extent;
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146 firePropertyChange(PROPERTY_EXTENT, oldValue, extent);
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147 setValue(getValue());
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148 }
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149
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150 /**
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151 * Sets this RangeModel's maximum value and fires a property change if the given value is
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152 * different from the current maximum value.
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153 *
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154 * @param maximum the new maximum value
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155 */
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156 public void setMaximum(int maximum) {
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157 if (this.maximum is maximum)
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158 return;
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159 int oldValue = this.maximum;
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160 this.maximum = maximum;
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161 firePropertyChange(PROPERTY_MAXIMUM, oldValue, maximum);
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162 setValue(getValue());
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163 }
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164
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165 /**
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166 * Sets this RangeModel's minimum value and fires a property change if the given value is
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167 * different from the current minimum value.
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168 *
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169 * @param minimum the new minumum value
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170 */
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171 public void setMinimum(int minimum) {
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172 if (this.minimum is minimum)
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173 return;
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174 int oldValue = this.minimum;
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175 this.minimum = minimum;
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176 firePropertyChange(PROPERTY_MINIMUM, oldValue, minimum);
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177 setValue(getValue());
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178 }
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179
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180 /**
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181 * Sets this RangeModel's current value. If the given value is greater than the maximum,
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182 * the maximum value is used. If the given value is less than the minimum, the minimum
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183 * value is used. If the adjusted value is different from the current value, a property
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184 * change is fired.
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185 *
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186 * @param value the new value
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187 */
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188 public void setValue(int value) {
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189 value = Math.max(getMinimum(), Math.min(getMaximum() - getExtent(), value));
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190 if (this.value is value)
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191 return;
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192 int oldValue = this.value;
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193 this.value = value;
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194 firePropertyChange(PROPERTY_VALUE, oldValue, value);
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195 }
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196
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197 /**
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198 * @see java.lang.Object#toString()
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199 */
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200 public String toString() {
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201 return Format( "{} ({}, {}, {}, {})", super.toString(), minimum, maximum //$NON-NLS-2$ //$NON-NLS-1$
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202 , extent, value ); //$NON-NLS-3$ //$NON-NLS-2$ //$NON-NLS-1$
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203 }
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204
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205 }