MakeDirObservable.java

package me.devsaki.hentoid.dirpicker.observable;

import java.io.File;
import java.io.IOException;

import me.devsaki.hentoid.dirpicker.exceptions.DirExistsException;
import me.devsaki.hentoid.dirpicker.exceptions.PermissionDeniedException;
import rx.Observable;
import rx.Subscriber;

/**
 * Created by avluis on 06/12/2016.
 * Make (create) Directory Observable
 */
public class MakeDirObservable {

    public Observable<File> create(final File rootDir, final String dirName) {
        return Observable.create(new Observable.OnSubscribe<File>() {
            @Override
            public void call(Subscriber<? super File> subscriber) {
                if (!rootDir.canWrite()) {
                    subscriber.onError(new PermissionDeniedException());
                }

                File newDir = new File(rootDir, dirName);
                if (newDir.exists()) {
                    subscriber.onError(new DirExistsException());
                } else {
                    boolean isDirCreated = newDir.mkdir();
                    if (isDirCreated) {
                        subscriber.onNext(newDir);
                        subscriber.onCompleted();
                    } else {
                        subscriber.onError(new IOException());
                    }
                }
            }
        });
    }
}