Examples of javax.lang.model.util.Types

javax.lang.model.util.Types
Utility methods for operating on types.
Compatibility Note: Methods may be added to this interface in future releases of the platform. @author Joseph D. Darcy @author Scott Seligman @author Peter von der Ahé @see javax.annotation.processing.ProcessingEnvironment#getTypeUtils @since 1.6

    public TypeElement asDecl(Class c) {
        return env.getElementUtils().getTypeElement(getSourceClassName(c));
    }


    public TypeMirror erasure(TypeMirror t) {
        Types tu = env.getTypeUtils();
        t = tu.erasure(t);
        if (t.getKind().equals(TypeKind.DECLARED)) {
            DeclaredType dt = (DeclaredType)t;
            if (!dt.getTypeArguments().isEmpty())
                return tu.getDeclaredType((TypeElement) dt.asElement());
        }
        return t;
    }

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    // parameters.
    @SuppressWarnings({ "rawtypes", "unchecked" })
    private static String getToolBarMethodName( final TypeElement classElement,
                                                final ProcessingEnvironment processingEnvironment,
                                                final Class annotation ) throws GenerationException {
        final Types typeUtils = processingEnvironment.getTypeUtils();
        final Elements elementUtils = processingEnvironment.getElementUtils();
        final TypeMirror requiredReturnType = elementUtils.getTypeElement( "org.uberfire.workbench.model.toolbar.ToolBar" ).asType();
        final List<ExecutableElement> methods = ElementFilter.methodsIn( classElement.getEnclosedElements() );


        ExecutableElement match = null;
        for ( ExecutableElement e : methods ) {


            final TypeMirror actualReturnType = e.getReturnType();


            //Check method
            if ( e.getAnnotation( annotation ) == null ) {
                continue;
            }
            if ( !typeUtils.isAssignable( actualReturnType,
                                          requiredReturnType ) ) {
                continue;
            }
            if ( e.getParameters().size() != 0 ) {
                continue;

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    @SuppressWarnings({ "rawtypes", "unchecked" })
    private static String getMethodName( final TypeElement classElement,
                                         final ProcessingEnvironment processingEnvironment,
                                         final String expectedReturnType,
                                         final Class annotation ) throws GenerationException {
        final Types typeUtils = processingEnvironment.getTypeUtils();
        final Elements elementUtils = processingEnvironment.getElementUtils();
        final TypeMirror requiredReturnType = elementUtils.getTypeElement( expectedReturnType ).asType();
        final List<ExecutableElement> methods = ElementFilter.methodsIn( classElement.getEnclosedElements() );


        ExecutableElement match = null;
        for ( ExecutableElement e : methods ) {


            final TypeMirror actualReturnType = e.getReturnType();


            //Check method
            if ( e.getAnnotation( annotation ) == null ) {
                continue;
            }
            if ( !typeUtils.isAssignable( actualReturnType,
                                          requiredReturnType ) ) {
                continue;
            }
            if ( e.getParameters().size() != 0 ) {
                continue;

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     * @param processingEnvironment
     * @return
     */
    public static boolean getIsWidget( final TypeElement classElement,
                                       final ProcessingEnvironment processingEnvironment ) {
        final Types typeUtils = processingEnvironment.getTypeUtils();
        final Elements elementUtils = processingEnvironment.getElementUtils();
        final TypeMirror requiredReturnType = elementUtils.getTypeElement( "com.google.gwt.user.client.ui.IsWidget" ).asType();
        return typeUtils.isAssignable( classElement.asType(),
                                       requiredReturnType );
    }

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                                                final ProcessingEnvironment processingEnvironment,
                                                final ExecutableElement getWidgetMethod ) {
        if ( getWidgetMethod == null ) {
            return false;
        }
        final Types typeUtils = processingEnvironment.getTypeUtils();
        final Elements elementUtils = processingEnvironment.getElementUtils();
        final TypeMirror requiredReturnType = elementUtils.getTypeElement( "org.uberfire.client.mvp.UberView" ).asType();


        return typeUtils.isAssignable( typeUtils.erasure( getWidgetMethod.getReturnType() ),
                                       requiredReturnType );
    }

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     * @param processingEnvironment
     * @return
     */
    public static boolean getIsPopup( final TypeElement classElement,
                                      final ProcessingEnvironment processingEnvironment ) {
        final Types typeUtils = processingEnvironment.getTypeUtils();
        final Elements elementUtils = processingEnvironment.getElementUtils();
        final TypeMirror requiredReturnType = elementUtils.getTypeElement( "com.google.gwt.user.client.ui.PopupPanel" ).asType();
        return typeUtils.isAssignable( classElement.asType(),
                                       requiredReturnType );
    }

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    @SuppressWarnings({ "rawtypes", "unchecked" })
    private static String getVoidMethodName( final TypeElement classElement,
                                             final ProcessingEnvironment processingEnvironment,
                                             final Class annotation ) throws GenerationException {


        final Types typeUtils = processingEnvironment.getTypeUtils();
        final TypeMirror requiredReturnType = typeUtils.getNoType( TypeKind.VOID );
        final List<ExecutableElement> methods = ElementFilter.methodsIn( classElement.getEnclosedElements() );


        ExecutableElement match = null;
        for ( ExecutableElement e : methods ) {


            final TypeMirror actualReturnType = e.getReturnType();


            //Check method
            if ( e.getAnnotation( annotation ) == null ) {
                continue;
            }
            if ( !typeUtils.isSameType( actualReturnType,
                                        requiredReturnType ) ) {
                continue;
            }
            if ( e.getParameters().size() != 0 ) {
                continue;

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    private static String getVoidMethodName( final TypeElement classElement,
                                             final ProcessingEnvironment processingEnvironment,
                                             final String[] parameterTypes,
                                             final Class annotation ) throws GenerationException {


        final Types typeUtils = processingEnvironment.getTypeUtils();
        final Elements elementUtils = processingEnvironment.getElementUtils();
        final TypeMirror requiredReturnType = typeUtils.getNoType( TypeKind.VOID );
        final List<ExecutableElement> methods = ElementFilter.methodsIn( classElement.getEnclosedElements() );


        ExecutableElement match = null;
        for ( ExecutableElement e : methods ) {


            final TypeMirror actualReturnType = e.getReturnType();


            //Check method
            if ( e.getAnnotation( annotation ) == null ) {
                continue;
            }
            if ( !typeUtils.isSameType( actualReturnType,
                                        requiredReturnType ) ) {
                continue;
            }
            if ( !doParametersMatch( typeUtils,
                                     elementUtils,

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    // parameters.
    @SuppressWarnings({ "rawtypes", "unchecked" })
    private static String getBooleanMethodName( final TypeElement classElement,
                                                final ProcessingEnvironment processingEnvironment,
                                                final Class annotation ) throws GenerationException {
        final Types typeUtils = processingEnvironment.getTypeUtils();
        final Elements elementUtils = processingEnvironment.getElementUtils();
        final TypeMirror requiredReturnType = elementUtils.getTypeElement( Boolean.class.getName() ).asType();
        final List<ExecutableElement> methods = ElementFilter.methodsIn( classElement.getEnclosedElements() );


        ExecutableElement match = null;
        for ( ExecutableElement e : methods ) {


            final TypeMirror actualReturnType = e.getReturnType();


            //Check method
            if ( e.getAnnotation( annotation ) == null ) {
                continue;
            }
            if ( !typeUtils.isAssignable( actualReturnType,
                                          requiredReturnType ) ) {
                continue;
            }
            if ( e.getParameters().size() != 0 ) {
                continue;

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    // parameters.
    @SuppressWarnings({ "rawtypes", "unchecked" })
    private static String getStringMethodName( final TypeElement classElement,
                                               final ProcessingEnvironment processingEnvironment,
                                               final Class annotation ) throws GenerationException {
        final Types typeUtils = processingEnvironment.getTypeUtils();
        final Elements elementUtils = processingEnvironment.getElementUtils();
        final TypeMirror requiredReturnType = elementUtils.getTypeElement( String.class.getName() ).asType();
        final List<ExecutableElement> methods = ElementFilter.methodsIn( classElement.getEnclosedElements() );


        ExecutableElement match = null;
        for ( ExecutableElement e : methods ) {


            final TypeMirror actualReturnType = e.getReturnType();


            //Check method
            if ( e.getAnnotation( annotation ) == null ) {
                continue;
            }
            if ( !typeUtils.isAssignable( actualReturnType,
                                          requiredReturnType ) ) {
                continue;
            }
            if ( e.getParameters().size() != 0 ) {
                continue;

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