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Download the preprocessor The <eclipsetoolspreprocessor> task mentioned above is not part of Ant or Eclipse, but an Ant extension that we wrote We needed it to build our products, and we make it freely available for anyone to use: http://wwwqualityeclipsecom/ant/preprocessor
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Figure 19-12 Preprocessor approach
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Code to be translated by the preprocessor involves structured Java comments The preprocessor statements embedded in comments expose the API call for only one version of Eclipse while hiding the different API calls for the other versions During the build process, the source is parsed and some sections are commented while others are uncommented, all before the source is sent to the Java compiler (see Figure 19-13) For example, the code below is developed against the Eclipse 30 environment, and thus the Eclipse 30 specific code is uncommented, while the Eclipse 20 and 21 specific code is commented
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TT 19 Building a product
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Figure 19-13 Preprocessor translating code
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In addition, differences in the pluginxml can be handled in a similar manner For example, the orgeclipseuiide plug-in only exists in Eclipse 30, not in Eclipse 21
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< xml version="10" encoding="UTF-8" > <plugin id="commycompanymyapp" name="%pluginName" version="100" provider-name="My Company" class=" commycompanymyappMyPlugin"> <requires>
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<import plugin="orgapachexerces"/> <import plugin="orgeclipsecoreruntime"/> <import plugin="orgeclipsecoreresources"/> <import plugin="orgeclipseui"/> <!-- $if version >= 30 $ --> <import plugin="orgeclipseuiide" optional="true"/> <!--$endif $ --> </requires> etc </plugin>
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Since we want to support Eclipse 21, the next step is to modify the Favorites project so that the source correctly compiles against Eclipse 21 First modify the ECLIPSE30_HOME classpath variable so that it points to the Eclipse 21 installation and adjust the Favorites project classpath Then modify the code so that it properly compiles against Eclipse 21, placing any Eclipse 30 specific code in comments Finally, revert the classpath variable so that it again points to the Eclipse 30 installation, and adjust the preprocessor comments accordingly
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Tip: A tool for automatically adjusting the classpath of a project between versions of Eclipse is available on the QualityEclipse website http://wwwqualityeclipsecom/tools/classpath
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When preparing the Favorites view for Eclipse 21, one of the issues encountered is the addHelpButtonToToolBar() method In this case the Eclipse 30 Help public API differs from the Eclipse 21 Help public API Because of this, we must adjust the addHelpButtonToToolBar() method in FavoritesView
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to wrapper the Eclipse 30 specific code in preprocessor state-
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private void addHelpButtonToToolBar() { Action helpAction = new Action() { public void run() { /* $if version >= 30 $ */ WorkbenchHelpdisplayHelpResource( "/comqualityeclipsefavoriteshelp" + "/html/tochtml"); /* $elseif version < 30 $ IHelp helpSupport = WorkbenchHelpgetHelpSupport(); if (helpSupport != null) helpSupportdisplayHelp( "/comqualityeclipsefavoriteshelp/tocxml", "/comqualityeclipsefavoriteshelp" + "/html/tochtml"); $endif $ */ } }; etc }
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Another different we encounter is in the Favorites plug-in manifest The manifest references the orgeclipseuiide plug-in, which exists in
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Eclipse 30 but not in Eclipse 21 Preprocessor statements are added to the plug-in manifest as follows suppress that requirement in Eclipse 21:
< xml version="10" encoding="UTF-8" > < eclipse version="30" > <plugin id="comqualityeclipsefavorites" name="Favorites Plug-in" version="100" provider-name="QualityEclipse" class="comqualityeclipsefavoritesFavoritesPlugin"> <runtime> <library name="favoritesjar"> <export name="*"/> <packages prefixes="comqualityeclipsefavorites"/> </library> </runtime> <requires> <!-- $if version >= 30 $ --> <import plugin="orgeclipseuiide"/> <!-- $endif $ --> <import plugin="orgeclipseuiviews"/> <import plugin="orgeclipsejfacetext"/> <import plugin="orgeclipseuiworkbenchtexteditor"/> <import plugin="orgeclipseuieditors"/> <import plugin="orgeclipsecoreresources"/> <import plugin="orgeclipseui"/> <import plugin="orgeclipsejdtcore"/> <import plugin="orgeclipsejdtui"/> <import plugin="orgeclipsehelp"/> </requires> etc </plugin>
This process of switching the classpath variable need only be performed once per project to get the code to compile against a different version of
TT 19 Building a product
Eclipse To support multiple versions of Eclipse in an ongoing manner, simply code against one version of Eclipse, and then build the product to make sure that it compiles against the others, adding preprocessor statements only as necessary In practice, this is not a big deal as only a fraction of your code base will include any preprocessor statements (typically less than 1% of the files) The final step is to run the code through the preprocessor before it is compiled First we must add the following declaration to the init target so that the preprocessor knows which for version of Eclipse the source is coded and at which versions of Eclipse the source can be targeted
<!-- Preprocessor information --> <property name="preprocessorversionsource" value="30"/> <property name="preprocessorversionvalid" value="21,30"/>