Developing the Color Modeling Diagram in Java

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46 Developing the Color Modeling Diagram
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The rest of the template definition appears here It s a straightforward templating of our handcrafted code, with the only other noteworthy aspect being the use of toPreferenceConstant() again in the getPreferenceColor definition block
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DEFINE addNotationalListeners FOR gmfgen::GenNode- EXPAND xpt::Common::generatedMemberComment- @Override protected void addNotationalListeners() { superaddNotationalListeners(); initPreferenceStoreListener(); } ENDDEFINE DEFINE initPreferenceStoreListener FOR gmfgen::GenNode- EXPAND xpt::Common::generatedMemberComment- private void initPreferenceStoreListener() { preferenceListener = new PreferencePropertyChangeListener(); orgeclipsejfacepreferenceIPreferenceStore preferenceStore = (orgeclipsejfacepreferenceIPreferenceStore) getDiagramPreferencesHint()getPreferenceStore(); preferenceStoreaddPropertyChangeListener(preferenceListener); } ENDDEFINE DEFINE updateArchetypeColor FOR gmfgen::GenNode- EXPAND xpt::Common::generatedMemberComment- protected void updateArchetypeColor() { getFigure()setForegroundColor(getPreferenceColor()); getFigure()repaint(); } ENDDEFINE DEFINE getPreferenceColor FOR gmfgen::GenNode- EXPAND xpt::Common::generatedMemberComment- private orgeclipseswtgraphicsColor getPreferenceColor() { orgeclipsejfacepreferenceIPreferenceStore preferenceStore = (orgeclipsejfacepreferenceIPreferenceStore) getDiagramPreferencesHint()getPreferenceStore(); orgeclipseswtgraphicsRGB archetypeColorPreference = orgeclipsejfacepreferencePreferenceConvertergetColor( preferenceStore, EXPAND xpt::diagram::preferences::AppearancePreferencePage::qualifiedClassName FOR diagram modelFacetmetaClassecoreClasstoPreferenceConstant() ); return new orgeclipseswtgraphicsColor(null, archetypeColorPreference); } ENDDEFINE DEFINE setForegroundColorMethod FOR gmfgen::GenNode- EXPAND xpt::Common::generatedMemberComment-
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@Override protected void setForegroundColor(orgeclipseswtgraphicsColor color) { supersetForegroundColor(getPreferenceColor()); } ENDDEFINE
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Moving on to the preference page templates, we find the original
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AppearancePreferencePagexpt template in /templates/xpt/diagram/ preferences We need to override this template, along with PreferenceInitializerxpt, because they were apparently not created with extensibility in mind, as was the case with the NodeEditPartxpt
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template This means that we simply copy these two templates into our own /templates-diagram/xpt/diagram/preferences folder and modify them to suit our needs Most of the changes required for the preference page code is straightforward copy and paste from our earlier handcrafted code, so we don t repeat it here However, we do need to explore how GMF deals with globalization because we need to add referenced elements to our generated Messages class and messagesproperties file Looking at the template files, we find an Externalizerxpt template in the /templates/xpt folder in the generator plug-in The Externalizer template provides a centralized means by which to generate the Messages class and properties file The template is organized in two main definition blocks, as shown here Basically, GMF convention is to declare an i18nAccessors and i18nValues definition in templates that require localization and invoke them from the Fields and Values definitions, respectively
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DEFINE Fields FOR gmfgen::GenEditorGenerator EXPAND xpt::editor::CreateShortcutAction::i18nAccessors FOR diagram- EXPAND xpt::editor::CreationWizard::i18nAccessors FOR diagram- EXPAND xpt::editor::CreationWizardPage::i18nAccessors FOR diagram- ENDDEFINE DEFINE Values FOR gmfgen::GenEditorGenerator EXPAND xpt::editor::CreateShortcutAction::i18nValues FOR diagram- EXPAND xpt::editor::CreationWizard::i18nValues FOR diagram- EXPAND xpt::editor::CreationWizardPage::i18nValues FOR diagram- ENDDEFINE
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We follow suit with our properties preference page by defining similar blocks for invocation by our overridden Externalizerxpt template First, we take a look at the externalizer, which is placed in our /templates-diagram/ aspects/xpt directory
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46 Developing the Color Modeling Diagram
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IMPORT "http://wwweclipseorg/gmf/2006/GenModel" IMPORT "http://wwweclipseorg/emf/2002/Ecore" EXTENSION xpt::ExternalizerUtils AROUND Fields FOR gmfgen::GenEditorGenerator EXPAND xpt::diagram::preferences::AppearancePreferencePage::i18nAccessors FOR diagram- targetDefproceed()- ENDAROUND AROUND Values FOR gmfgen::GenEditorGenerator EXPAND xpt::diagram::preferences::AppearancePreferencePage::i18nValues FOR diagram- targetDefproceed()- ENDAROUND
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Here, we create AROUND aspects for both the Fields and Values definitions, expand our custom template definitions, and then continue execution of the original template using targetDefproceed() This is a common approach to extensibility using Xpand Back in our AppearancePreference Pagexpt template, we find the definitions
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DEFINE i18nValues FOR gmfgen::GenDiagram- EXPAND xpt::Externalizer::messageEntry( "AppearancePreferencePage_archetypeColorGroup_label", "Archetype colors")- EXPAND xpt::Externalizer::messageEntry( "AppearancePreferencePage_pinkArchetypeColor_label", "Pinks (moment-interval, mi-detail):")- EXPAND xpt::Externalizer::messageEntry( "AppearancePreferencePage_yellowArchetypeColor_label", "Yellows (role):")- EXPAND xpt::Externalizer::messageEntry( "AppearancePreferencePage_greenArchetypeColor_label", "Greens (party, place, thing):")- EXPAND xpt::Externalizer::messageEntry( "AppearancePreferencePage_blueArchetypeColor_label", "Blues (description):")- EXPAND xpt::Externalizer::messageEntry( "AppearancePreferencePage_grayArchetypeColor_label", "Plug-in point:")- ENDDEFINE
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DEFINE i18nAccessors FOR gmfgen::GenDiagram- EXPAND xpt::Externalizer::accessorField( "AppearancePreferencePage_archetypeColorGroup_label")- EXPAND xpt::Externalizer::accessorField( "AppearancePreferencePage_pinkArchetypeColor_label")- EXPAND xpt::Externalizer::accessorField( "AppearancePreferencePage_yellowArchetypeColor_label")- EXPAND xpt::Externalizer::accessorField( "AppearancePreferencePage_greenArchetypeColor_label")- EXPAND xpt::Externalizer::accessorField( "AppearancePreferencePage_blueArchetypeColor_label")- EXPAND xpt::Externalizer::accessorField( "AppearancePreferencePage_grayArchetypeColor_label")- ENDDEFINE
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When the Messages class and messagesproperties files are being generated, each template that requires messages is invoked and the strings are added to these files You need to go to the i18nValues blocks for declaring the default localized string values when using GMF Xpand templates Two callback expansions are made from the template to messageEntry and accessorField in the Externalizerxpt template, as shown here The first creates a public static String entry in the generated Messages class file; the second creates a key=value entry in the messagesproperties file
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DEFINE accessorField(String key) FOR Object EXPAND xpt::Common::generatedMemberComment public static String escapeIllegalKeySymbols(key) ; ENDDEFINE DEFINE messageEntry(String key, String message) FOR Object- escapeIllegalKeySymbols(key) = escapeIllegalMessageSymbols(message) ENDDEFINE
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Having provided a means by which to produce messages, we now need to access them in our generated code; this means examining another aspect of GMF s Externalizerxpt template When a message is accessed in the code generated, it needs to resolve the Messages class, which means calling back again to the Externalizerxpt template so that the fully qualified path can be provided Following is the accessorCall definition, used for just this purpose
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