author | Jan Vrany <jan.vrany@fit.cvut.cz> |
Wed, 28 Sep 2011 20:07:49 +0100 | |
branch | jv |
changeset 17865 | 598963c6ff8e |
parent 17846 | 24edc476ac18 |
child 17869 | 9610c6c94e71 |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1999 by eXept Software AG |
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All Rights Reserved |
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|
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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"{ Package: 'stx:libbasic' }" |
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IdentityDictionary subclass:#ExceptionHandlerSet |
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instanceVariableNames:'' |
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classVariableNames:'' |
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poolDictionaries:'' |
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category:'Kernel-Exceptions' |
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! |
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!ExceptionHandlerSet class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1999 by eXept Software AG |
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All Rights Reserved |
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|
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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|
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! |
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documentation |
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" |
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A ExceptionHandlerSet allows a group of unrelated signals to be handled |
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by individual handlers - their evaluation is equivalent to a corresponding |
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number of nested signal handlers, but more efficient and |
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somwehat easier to program. |
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|
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[author:] |
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Stefan Vogel |
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[see also:] |
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Exception Signal SignalSet |
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" |
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! |
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examples |
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" |
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[exBegin] |
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|h num| |
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h := ExceptionHandlerSet new. |
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h on:ZeroDivide |
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do:[:ex | 'division by zero' printCR. ex proceed]. |
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h on:HaltInterrupt |
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do:[:ex | 'halt encountered ' printCR. ex proceed]. |
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h on:DomainError |
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do:[:ex | 'domain error ' printCR. ex proceed]. |
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h handleDo:[ |
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num := 0. |
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'now dividing' printCR. |
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1 // num. |
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'now doing bad arcSin' printCR. |
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num := 50. |
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num arcSin. |
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'now halting' printCR. |
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self halt. |
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] |
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[exEnd] |
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[exBegin] |
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|h num| |
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h := ExceptionHandlerSet new. |
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h on:ZeroDivide |
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do:[:ex | 'division by zero' printCR. ex proceed]. |
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h on:HaltInterrupt |
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do:[:ex | 'halt encountered ' printCR. ex proceed]. |
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h on:DomainError |
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do:[:ex | 'domain error ' printCR. ex proceed]. |
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[ |
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num := 0. |
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'now dividing' printCR. |
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1 // num. |
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'now doing bad arcSin' printCR. |
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num := 50. |
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num arcSin. |
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'now halting' printCR. |
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self halt. |
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] valueWithExceptionHandler:h |
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[exEnd] |
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" |
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! ! |
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!ExceptionHandlerSet methodsFor:'Compatibility-VW5.4'! |
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on:aSignalOrException handle:aHandler |
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"add a handler for aSignal to the set" |
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self on:aSignalOrException do:aHandler |
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"Created: / 26.7.1999 / 09:51:37 / stefan" |
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! ! |
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!ExceptionHandlerSet methodsFor:'adding'! |
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on:aSignalOrException do:aHandler |
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"add a handler for aSignal to the set" |
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aSignalOrException isBehavior ifTrue:[ |
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"load class, if not yet loaded" |
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aSignalOrException autoload. |
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]. |
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self at:aSignalOrException put:aHandler |
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! ! |
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!ExceptionHandlerSet methodsFor:'queries'! |
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accepts:anExceptionHandler |
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"return true, if the receiver accepts the argument, aSignal. |
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(i.e. if any of the receivers elements is aSignal or a parent of it)." |
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self keysDo:[:eachExceptionHandler | |
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(eachExceptionHandler==anExceptionHandler |
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or:[eachExceptionHandler accepts:anExceptionHandler]) ifTrue:[^ true]. |
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]. |
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^ false |
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"Created: / 26.7.1999 / 09:53:09 / stefan" |
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! |
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exceptionHandlerFor:anException in:aContext |
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"answer the exceptionHandler for anException from aContext." |
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152 |
|
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153 |
^ self |
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154 |
! |
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155 |
|
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156 |
handlerForSignal:signal |
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"answer the handler block for signal" |
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158 |
|
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159 |
self keysAndValuesDo:[:sig :handler| |
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(sig == signal or:[sig accepts:signal]) ifTrue:[ |
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161 |
^ handler. |
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162 |
]. |
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163 |
]. |
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164 |
|
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165 |
^ nil |
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166 |
|
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167 |
"Modified: / 26.7.1999 / 09:59:43 / stefan" |
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168 |
"Created: / 26.7.1999 / 11:29:29 / stefan" |
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169 |
! |
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170 |
|
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171 |
handlerForSignal:signal context:theContext originator:originator |
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172 |
"answer the handler block for the signal from originator. |
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173 |
The block is retrieved from aContext. |
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174 |
Answer nil if the signal is not handled" |
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175 |
|
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176 |
|
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177 |
(theContext selector ~~ #'handleDo:from:' |
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178 |
or:[(theContext argAt:2) == originator]) ifTrue:[ |
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179 |
self keysAndValuesDo:[:sig :handler| |
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(sig == signal or:[sig accepts:signal]) ifTrue:[ |
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181 |
^ handler ? [nil]. |
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182 |
]. |
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183 |
]. |
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184 |
]. |
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185 |
|
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186 |
^ nil |
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187 |
|
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188 |
"Created: / 26.7.1999 / 09:53:28 / stefan" |
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189 |
"Modified: / 26.7.1999 / 09:59:43 / stefan" |
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190 |
! |
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191 |
|
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192 |
handlerProtectedBlock:doBlock inContext:context |
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193 |
"set the handlerProtectedBlock in context" |
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194 |
|
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195 |
context argAt:1 put:doBlock. |
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196 |
|
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197 |
" |
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198 |
|s| |
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199 |
|
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200 |
s := ExceptionHandlerSet new. |
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201 |
s at:Error put:[:ex| ex restartDo:[55]]. |
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202 |
|
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203 |
s handleDo:[1 // 0] |
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204 |
" |
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205 |
|
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206 |
! |
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207 |
|
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208 |
handles:anException |
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209 |
"return true, if the receiver handles the argument, anException. |
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210 |
(i.e. if any of the receivers elements handles anException)." |
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211 |
|
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212 |
self keysDo:[:eachExceptionHandler| |
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213 |
(eachExceptionHandler handles:anException) ifTrue:[^ true] |
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214 |
]. |
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215 |
^ false |
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216 |
! ! |
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|
217 |
|
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218 |
!ExceptionHandlerSet methodsFor:'save evaluation'! |
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|
219 |
|
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220 |
handleDo:aBlock |
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221 |
"evaluate the argument, aBlock. |
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|
222 |
If any of the signals in the receiver is raised during evaluation, |
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|
223 |
evaluate the handleBlock passing it an Exception argument. |
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|
224 |
The handler may decide how to react to the signal by sending |
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|
225 |
a corresponding message to the exception (see there). |
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|
226 |
If the signal is not raised, return the value of evaluating |
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227 |
aBlock." |
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|
228 |
|
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229 |
<context: #return> |
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230 |
<exception: #handle> |
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|
231 |
|
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232 |
"/ thisContext markForHandle. -- same as above pragma |
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233 |
^ aBlock value "the real logic is in Exception>>doRaise" |
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234 |
|
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235 |
" |
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236 |
|h num| |
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237 |
|
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238 |
h := ExceptionHandlerSet new. |
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239 |
h on:(Number divisionByZeroSignal) |
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240 |
handle:[:ex | 'division by zero' printNL. ex proceed]. |
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241 |
|
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242 |
h on:(Object haltSignal) |
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243 |
handle:[:ex | 'halt encountered ' printNL. ex proceed]. |
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244 |
|
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245 |
h on:(Float domainErrorSignal) |
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246 |
handle:[:ex | 'domain error ' printNL. ex proceed]. |
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|
247 |
|
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248 |
h handleDo:[ |
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249 |
num := 0. |
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250 |
|
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251 |
'now dividing' printNL. |
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252 |
1 // num. |
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253 |
|
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254 |
'now doing bad arcSin' printNL. |
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|
255 |
num := 50. |
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|
256 |
num arcSin. |
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|
257 |
|
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|
258 |
'now halting' printNL. |
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|
259 |
self halt. |
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260 |
] |
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261 |
" |
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|
262 |
|
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|
263 |
"Created: / 26.7.1999 / 09:56:44 / stefan" |
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|
264 |
"Modified: / 26.7.1999 / 11:01:53 / stefan" |
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|
265 |
! |
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|
266 |
|
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|
267 |
handleDo:aBlock from:originator |
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|
268 |
"evaluate the argument, aBlock. |
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|
269 |
If any of the signals in the receiver is raised during evaluation, |
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|
270 |
evaluate the handleBlock passing it an Exception argument. |
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|
271 |
The handler may decide how to react to the signal by sending |
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|
272 |
a corresponding message to the exception (see there). |
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|
273 |
If the signal is not raised, return the value of evaluating |
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|
274 |
aBlock." |
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275 |
|
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|
276 |
<context: #return> |
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<exception: #handle> |
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"/ thisContext markForHandle. -- same as above pragma |
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^ aBlock value "the real logic is in Exception>>doRaise" |
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" |
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|h num| |
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h := ExceptionHandlerSet new. |
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h on:(Number divisionByZeroSignal) |
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handle:[:ex | 'division by zero' printNL. ex proceed]. |
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h on:(Object haltSignal) |
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handle:[:ex | 'halt encountered ' printNL. ex proceed]. |
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h on:(Float domainErrorSignal) |
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handle:[:ex | 'domain error ' printNL. ex proceed]. |
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h handleDo:[ |
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'now halting' printNL. |
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self halt. |
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'the following exceptions are not handled. |
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A debugger is opened' printNL. |
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'now dividing' printNL. |
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num := 0. |
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1 // num. |
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|
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'now doing bad arcSin' printNL. |
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num := 50. |
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num arcSin. |
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] from:self |
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" |
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|
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"Created: / 26.7.1999 / 09:56:44 / stefan" |
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"Modified: / 26.7.1999 / 11:36:47 / stefan" |
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! ! |
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8700 | 316 |
!ExceptionHandlerSet methodsFor:'testing'! |
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||
318 |
isExceptionHandler |
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"return true, if the receiver responds to the exception handler protocol, |
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especially to the #accepts: and #handles: messages" |
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||
322 |
^ true |
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323 |
! ! |
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324 |
||
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!ExceptionHandlerSet class methodsFor:'documentation'! |
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version |
17865 | 328 |
^ '$Id: ExceptionHandlerSet.st 10695 2011-09-28 19:07:49Z vranyj1 $' |
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! |
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||
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version_SVN |
|
332 |
^ '$Id: ExceptionHandlerSet.st 10695 2011-09-28 19:07:49Z vranyj1 $' |
|
17846 | 333 |
! ! |