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    • com.jzallas.lifecycleaware.compiler.Utils Maven / Gradle / Ivy

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    Annotation based triggers that automatically hook observers into the Android lifecycle.

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    package com.jzallas.lifecycleaware.compiler;

import com.squareup.javapoet.CodeBlock;

import java.util.HashSet;
import java.util.Set;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collector;

import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.Elements;
import javax.lang.model.util.Types;

public class Utils {
    /**
     * Convenience method to help filtering distinct items in a {@link java.util.stream.Stream} by the provided {@link Predicate}
     *
     * @param keyExtractor function that generates a key from {@link T}
     * @param 
     * @return {@link Predicate} to be used with {@link java.util.stream.Stream#filter(Predicate)}
     */
    public static  Predicate distinctByKey(Function keyExtractor) {
        Set seen = new HashSet<>();
        return t -> seen.add(keyExtractor.apply(t));
    }

    /**
     * {@link Collector} used combine a {@link java.util.stream.Stream} of {@link CodeBlock}s into a single {@link CodeBlock}.
     *
     * @return
     */
    public static Collector toCodeBlockBuilder() {
        return Collector.of(
                CodeBlock::builder,
                CodeBlock.Builder::add,
                (builder, builder2) -> builder.add(builder2.build())
        );
    }

    public static boolean implementsInterface(Elements elementUtils, Types typeUtils, Element element, Class clazz) {
        TypeMirror classType = elementUtils.getTypeElement(clazz.getName()).asType();
        return typeUtils.isAssignable(element.asType(), classType);
    }

    public static String tryToExtractClassName(Types typeUtils, Element element) {
        TypeElement typeElement = (TypeElement) typeUtils.asElement(element.asType());
        // TODO - consider consequences if annotated field is a generic
        return typeElement == null
                ? element.getSimpleName().toString()
                : typeElement.getSimpleName().toString();
    }
}
    
    
    
    

    




    
    
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