com.shapesecurity.bandolier.es2018.loader.FallbackLoader Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of es2018 Show documentation

Bundles es2015+ modules

The newest version!

package com.shapesecurity.bandolier.es2018.loader;

import com.shapesecurity.shift.es2018.ast.Module;
import com.shapesecurity.shift.es2018.parser.JsError;

import javax.annotation.Nonnull;
import java.io.IOException;
import java.nio.file.Path;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class FallbackLoader implements IResourceLoader {
    @Nonnull
    private final Iterable loaders;

    public FallbackLoader(@Nonnull IResourceLoader primary, @Nonnull IResourceLoader fallback, @Nonnull IResourceLoader ...fallbacks) {
        this.loaders = Stream.concat(Stream.of(primary, fallback), Stream.of(fallbacks)).collect(Collectors.toList());
    }

    public FallbackLoader(@Nonnull Iterable loaders) {
        this.loaders = loaders;
    }

    @Override
    @Nonnull
    public Boolean exists(@Nonnull Path path) {
        for (IResourceLoader loader : this.loaders) {
            if (loader.exists(path)) {
                return true;
            }
        }
        return false;
    }

    @Override
    @Nonnull
    public String loadResource(@Nonnull Path path) throws IOException {
        for (IResourceLoader loader : this.loaders) {
            if (loader.exists(path)) {
                return loader.loadResource(path);
            }
        }
        throw new IOException("Failed to load resource at path " + path);
    }

    @Override
    @Nonnull
    public Module loadModule(@Nonnull Path path) throws IOException, JsError {
        for (IResourceLoader loader : this.loaders) {
            if (loader.exists(path)) {
                return loader.loadModule(path);
            }
        }
        throw new IOException("Failed to load resource at path " + path);
    }
}