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package org.apidesign.anagram.impl.annotations;

import java.util.Set;

import javax.annotation.processing.Processor;

import javax.annotation.processing.RoundEnvironment;

import javax.annotation.processing.SupportedAnnotationTypes;

import javax.annotation.processing.SupportedSourceVersion;

import javax.lang.model.SourceVersion;

import javax.lang.model.element.Element;

import javax.lang.model.element.TypeElement;

import javax.lang.model.util.Elements;

import org.apidesign.anagram.api.annotations.Words;

import org.openide.filesystems.annotations.LayerBuilder.File;

import org.openide.filesystems.annotations.LayerGeneratingProcessor;

import org.openide.filesystems.annotations.LayerGenerationException;

import org.openide.util.lookup.ServiceProvider;

/** Compile time caches example. Processor that is triggered

 * during compilation when a <code>@Words</code> annotations is found.

 * It generates some declarative registrations, so the annotated object

 * is found later during runtime, but not instantiated before it is really

 * needed.

 *

 * @author Jaroslav Tulach <jtulach@netbeans.org>

 */

// BEGIN: anagram.api.WordsProcessor

@ServiceProvider(service=Processor.class)

@SupportedAnnotationTypes("org.apidesign.anagram.api.annotations.Words")

@SupportedSourceVersion(SourceVersion.RELEASE_5)

public class WordsProcessor extends LayerGeneratingProcessor {

    @Override

    protected boolean handleProcess(

        Set<? extends TypeElement> set, RoundEnvironment env

    ) throws LayerGenerationException {

        Elements elements = processingEnv.getElementUtils();

        for (Element e : env.getElementsAnnotatedWith(Words.class)) {

            Words w = e.getAnnotation(Words.class);

            TypeElement te = (TypeElement)e.getEnclosingElement();

            String teName = elements.getBinaryName(te).toString();

// FINISH: anagram.api.WordsProcessor

// BEGIN: anagram.api.WordsProcessorLayer

            File f = layer(e).file(

                "Services/" + teName.replace('.', '-') + ".instance"

            );

            f.methodvalue(

                "instanceCreate",

                "org.apidesign.anagram.impl.annotations.WordsImpl",

                "create"

            );

            f.stringvalue(

                "instanceClass",

                "org.apidesign.anagram.impl.annotations.WordsImpl"

            );

            f.stringvalue(

                "instanceOf",

                "org.apidesign.anagram.api.WordLibrary"

            );

            f.methodvalue(

                "words",

                teName,

                e.getSimpleName().toString()

            );

            f.write();

// END: anagram.api.WordsProcessorLayer

        }

        return true;

    }

}