Examples of org.teavm.platform.metadata.MetadataGenerator

org.teavm.platform.metadata.MetadataGenerator

Represents a generator, that produces resources during compilation phase. User must implement this interface and bind this implementation to a method that would read resources at runtime.

Here is the full workflow:

Compiler finds a method that is marked with the {@link MetadataProvider} annotation.This method must be declared as native, otherwise compiler should throw an exception.
Compiler instantiates the {@link MetadataGenerator} instance with the no-arg constructorIf no such constructor exists, compiler throws exception.
Compiler runs the {@link #generateMetadata(MetadataGeneratorContext,MethodReference)} methodands gets the produced resource.
Compiler generates implementation of the method marked with {@link MetadataProvider}, that will return the generated resource in run time.

Therefore, the type of the value, returned by the {@link #generateMetadata(MetadataGeneratorContext,MethodReference)}method must match the returning type of the appropriate method, marked with {@link MetadataProvider}.

The valid resource types are the following:

Valid interfaces, extending the {@link Resource} annotation. Read the description of this interfacefor detailed description about valid resources interfaces.
{@link ResourceArray} of valid resources.
{@link ResourceMap} of valid resources.
The null value.

All other types are not considered to be resources and therefore are not accepted.

@author Alexey Andreev

            cons = generatorClass.getConstructor();
        } catch (NoSuchMethodException e) {
            throw new RuntimeException("Metadata generator " + generatorClassName + " does not have a public " +
                    "no-arg constructor", e);
        }
        MetadataGenerator generator;
        try {
            generator = (MetadataGenerator)cons.newInstance();
        } catch (IllegalAccessException | InstantiationException e) {
            throw new RuntimeException("Error instantiating metadata generator " + generatorClassName, e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException("Error instantiating metadata generator " + generatorClassName,
                    e.getTargetException());
        }
        DefaultMetadataGeneratorContext metadataContext = new DefaultMetadataGeneratorContext(context.getClassSource(),
                context.getClassLoader(), context.getProperties(), context);


        // Generate resource loader
        Resource resource = generator.generateMetadata(metadataContext, methodRef);
        writer.append("if (!window.hasOwnProperty(\"").appendMethodBody(methodRef).append("$$resource\")) {")
                .indent().softNewLine();
        writer.append("window.").appendMethodBody(methodRef).append("$$resource = ");
        ResourceWriterHelper.write(writer, resource);
        writer.append(';').softNewLine();

Examples of org.teavm.platform.metadata.MetadataGenerator

Related Classes of org.teavm.platform.metadata.MetadataGenerator