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annotate dwt/internal/Callback.d @ 13:f565d3a95c0a

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Ported dwt.internal
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Fri, 22 Aug 2008 16:46:34 +0200
parents a329f9c3d66d
children 2952d5604c0a
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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 * Port to the D programming language:
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12 * Jacob Carlborg <jacob.carlborg@gmail.com>
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13 *******************************************************************************/
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14 module dwt.internal.Callback;
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15
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16 import dwt.dwthelper.utils;
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17 import dwt.internal.C;
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18 import c = dwt.internal.c.callback;
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19
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20 /**
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21 * Instances of this class represent entry points into Java
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22 * which can be invoked from operating system level callback
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23 * routines.
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24 * <p>
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25 * IMPORTANT: A callback is only valid when invoked on the
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26 * thread which created it. The results are undefined (and
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27 * typically bad) when a callback is passed out to the
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28 * operating system (or other code) in such a way that the
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29 * callback is called from a different thread.
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30 */
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31
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32 public class Callback {
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33
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34 Object object;
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35 String method, signature;
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36 int argCount;
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37 int /*long*/ address, errorResult;
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38 boolean isStatic, isArrayBased;
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39
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40 static final String PTR_SIGNATURE = C.PTR_SIZEOF == 4 ? "I" : "J"; //$NON-NLS-1$ //$NON-NLS-2$
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41 static final String SIGNATURE_0 = getSignature(0);
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42 static final String SIGNATURE_1 = getSignature(1);
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43 static final String SIGNATURE_2 = getSignature(2);
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44 static final String SIGNATURE_3 = getSignature(3);
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45 static final String SIGNATURE_4 = getSignature(4);
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46 static final String SIGNATURE_N = "(["+PTR_SIGNATURE+")"+PTR_SIGNATURE; //$NON-NLS-1$ //$NON-NLS-2$
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48 /**
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49 * Constructs a new instance of this class given an object
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50 * to send the message to, a string naming the method to
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51 * invoke and an argument count. Note that, if the object
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52 * is an instance of <code>Class</code> it is assumed that
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53 * the method is a static method on that class.
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54 *
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55 * @param object the object to send the message to
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56 * @param method the name of the method to invoke
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57 * @param argCount the number of arguments that the method takes
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58 */
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59 public this (Object object, String method, int argCount) {
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60 this (object, method, argCount, false);
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61 }
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62
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63 /**
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64 * Constructs a new instance of this class given an object
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65 * to send the message to, a string naming the method to
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66 * invoke, an argument count and a flag indicating whether
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67 * or not the arguments will be passed in an array. Note
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68 * that, if the object is an instance of <code>Class</code>
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69 * it is assumed that the method is a static method on that
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70 * class.
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71 *
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72 * @param object the object to send the message to
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73 * @param method the name of the method to invoke
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74 * @param argCount the number of arguments that the method takes
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75 * @param isArrayBased <code>true</code> if the arguments should be passed in an array and false otherwise
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76 */
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77 public this (Object object, String method, int argCount, boolean isArrayBased) {
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78 this (object, method, argCount, isArrayBased, 0);
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79 }
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81 /**
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82 * Constructs a new instance of this class given an object
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83 * to send the message to, a string naming the method to
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84 * invoke, an argument count, a flag indicating whether
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85 * or not the arguments will be passed in an array and a value
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86 * to return when an exception happens. Note that, if
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87 * the object is an instance of <code>Class</code>
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88 * it is assumed that the method is a static method on that
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89 * class.
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90 *
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91 * @param object the object to send the message to
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92 * @param method the name of the method to invoke
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93 * @param argCount the number of arguments that the method takes
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94 * @param isArrayBased <code>true</code> if the arguments should be passed in an array and false otherwise
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95 * @param errorResult the return value if the java code throws an exception
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96 */
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97 public this (Object object, String method, int argCount, boolean isArrayBased, int /*long*/ errorResult) {
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98
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99 /* Set the callback fields */
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100 this.object = object;
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101 this.method = method;
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102 this.argCount = argCount;
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103 this.isStatic = cast(ClassInfo) object;
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104 this.isArrayBased = isArrayBased;
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105 this.errorResult = errorResult;
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106
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107 /* Inline the common cases */
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108 if (isArrayBased) {
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109 signature = SIGNATURE_N;
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110 } else {
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111 switch (argCount) {
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112 case 0: signature = SIGNATURE_0; break; //$NON-NLS-1$
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113 case 1: signature = SIGNATURE_1; break; //$NON-NLS-1$
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114 case 2: signature = SIGNATURE_2; break; //$NON-NLS-1$
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115 case 3: signature = SIGNATURE_3; break; //$NON-NLS-1$
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116 case 4: signature = SIGNATURE_4; break; //$NON-NLS-1$
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117 default:
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118 signature = getSignature(argCount);
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119 }
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120 }
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121
1
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122 /* Bind the address */
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123 address = bind (this, object, method, signature, argCount, isStatic, isArrayBased, errorResult);
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124 }
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125
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126 /**
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127 * Allocates the native level resources associated with the
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128 * callback. This method is only invoked from within the
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129 * constructor for the argument.
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130 *
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131 * @param callback the callback to bind
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132 * @param object the callback's object
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133 * @param method the callback's method
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134 * @param signature the callback's method signature
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135 * @param argCount the callback's method argument count
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136 * @param isStatic whether the callback's method is static
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137 * @param isArrayBased whether the callback's method is array based
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138 * @param errorResult the callback's error result
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139 */
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140 static synchronized int /*long*/ bind (Callback callback, Object object, String method, String signature, int argCount, boolean isStatic, boolean isArrayBased, int /*long*/ errorResult)
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141 {
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142 return c.bind(callback, object, method, signature, argCount, isStatic, isArrayBased, errorResult);
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143 }
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144
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145 /**
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146 * Releases the native level resources associated with the callback,
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147 * and removes all references between the callback and
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148 * other objects. This helps to prevent (bad) application code
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149 * from accidentally holding onto extraneous garbage.
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150 */
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151 public void dispose () {
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152 if (object is null) return;
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153 unbind (this);
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154 object = method = signature = null;
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155 address = 0;
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156 }
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157
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158 /**
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159 * Returns the address of a block of machine code which will
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160 * invoke the callback represented by the receiver.
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161 *
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162 * @return the callback address
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163 */
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164 public int /*long*/ getAddress () {
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165 return address;
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166 }
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167
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168 /**
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169 * Returns the SWT platform name.
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170 *
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171 * @return the platform name of the currently running SWT
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172 */
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173 public static String getPlatform ();
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174
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175 /**
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176 * Returns the number of times the system has been recursively entered
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177 * through a callback.
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178 * <p>
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179 * Note: This should not be called by application code.
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180 * </p>
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181 *
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182 * @return the entry count
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183 *
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184 * @since 2.1
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185 */
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186 public static int getEntryCount ()
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187 {
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188 return c.getEntryCount;
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189 }
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190
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191 static String getSignature(int argCount) {
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192 String signature = "("; //$NON-NLS-1$
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193 for (int i = 0; i < argCount; i++) signature = PTR_SIGNATURE;
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194 signature += ")" ~ PTR_SIGNATURE; //$NON-NLS-1$
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195 return signature;
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196 }
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197
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198 /**
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199 * Indicates whether or not callbacks which are triggered at the
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200 * native level should cause the messages described by the matching
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201 * <code>Callback</code> objects to be invoked. This method is used
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202 * to safely shut down SWT when it is run within environments
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203 * which can generate spurious events.
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204 * <p>
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205 * Note: This should not be called by application code.
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206 * </p>
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207 *
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208 * @param enable true if callbacks should be invoked
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209 */
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210 public static final synchronized void setEnabled (boolean enable)
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211 {
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212 return c.setEnabled(enable);
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213 }
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214
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215 /**
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216 * Returns whether or not callbacks which are triggered at the
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217 * native level should cause the messages described by the matching
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218 * <code>Callback</code> objects to be invoked. This method is used
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219 * to safely shut down SWT when it is run within environments
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220 * which can generate spurious events.
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221 * <p>
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222 * Note: This should not be called by application code.
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223 * </p>
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224 *
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225 * @return true if callbacks should not be invoked
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226 */
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227 public static final synchronized boolean getEnabled ()
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228 {
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229 return c.getEnabled;
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230 }
1
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231
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232 /**
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233 * This might be called directly from native code in environments
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234 * which can generate spurious events. Check before removing it.
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235 *
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236 * @deprecated
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237 *
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238 * @param ignore true if callbacks should not be invoked
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239 */
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240 static final void ignoreCallbacks (boolean ignore) {
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241 setEnabled (!ignore);
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242 }
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243
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244 /**
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245 * Immediately wipes out all native level state associated
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246 * with <em>all</em> callbacks.
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247 * <p>
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248 * <b>WARNING:</b> This operation is <em>extremely</em> dangerous,
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249 * and should never be performed by application code.
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250 * </p>
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251 */
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252 public static final synchronized void reset ();
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253
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254 /**
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255 * Releases the native level resources associated with the callback.
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256 *
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257 * @see #dispose
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258 */
11
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259 static final synchronized void unbind (Callback callback)
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260 {
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261 c.unbind(callback);
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262 }
1
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263
0
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264 }