com.flipboard.goldengate.Processor Maven / Gradle / Ivy

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Generate type safe java bridge into webview javascript code
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package com.flipboard.goldengate;

import java.util.HashSet;
import java.util.Set;

import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.Filer;
import javax.annotation.processing.Messager;
import javax.annotation.processing.ProcessingEnvironment;
import javax.annotation.processing.RoundEnvironment;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.TypeElement;
import javax.lang.model.util.Elements;
import javax.lang.model.util.Types;
import javax.tools.Diagnostic;

public class Processor extends AbstractProcessor {

    public static Processor instance;

    public Types typeUtils;
    public Elements elementUtils;
    public Filer filer;
    public Messager messager;

    @Override
    public Set getSupportedAnnotationTypes() {
        return new HashSet() {{
            add(Bridge.class.getCanonicalName());
        }};
    }

    @Override
    public SourceVersion getSupportedSourceVersion() {
        return SourceVersion.latestSupported();
    }

    @Override
    public synchronized void init(ProcessingEnvironment processingEnv) {
        super.init(processingEnv);
        instance = this;
        typeUtils = processingEnv.getTypeUtils();
        elementUtils = processingEnv.getElementUtils();
        filer = processingEnv.getFiler();
        messager = processingEnv.getMessager();
    }

    @Override
    public boolean process(Set annotations, RoundEnvironment roundEnv) {
        for (Element annotatedElement : roundEnv.getElementsAnnotatedWith(Bridge.class)) {
            // Make sure element is an interface declaration
            if (annotatedElement.getKind() != ElementKind.INTERFACE) {
                error(annotatedElement, "Only interfaces can be annotated with @%s", Bridge.class.getSimpleName());
                return true;
            }

            try {
                new BridgeInterface(annotatedElement).writeToFiler(filer);
            } catch (Exception e) {
                error(annotatedElement, "%s", e.getMessage());
            }
        }
        return true;
    }

    private void error(Element e, String msg, Object... args) {
        messager.printMessage(Diagnostic.Kind.ERROR, String.format(msg, args), e);
    }

}