com.nytimes.android.external.fs.FSWriter Maven / Gradle / Ivy

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package com.nytimes.android.external.fs;

import com.nytimes.android.external.fs.filesystem.FileSystem;
import com.nytimes.android.external.store.base.DiskWrite;

import java.util.concurrent.Callable;

import javax.annotation.Nonnull;

import okio.BufferedSource;
import rx.Observable;
/**
 * FSReader is used when persisting to file system
 * PathResolver will be used in creating file system paths based on cache keys.
 * Make sure to have keys containing same data resolve to same "path"
 * @param  key type
 */
public class FSWriter implements DiskWrite {
    final FileSystem fileSystem;
    final PathResolver pathResolver;

    public FSWriter(FileSystem fileSystem, PathResolver pathResolver) {
        this.fileSystem = fileSystem;
        this.pathResolver = pathResolver;
    }

    @Nonnull
    @Override
    public Observable write(@Nonnull final T key, @Nonnull final BufferedSource data) {
        return Observable.fromCallable(new Callable() {
            @Nonnull
            @Override
            @SuppressWarnings("PMD.SignatureDeclareThrowsException")
            public Boolean call() throws Exception {
                fileSystem.write(pathResolver.resolve(key), data);
                return true;
            }
        });
    }
}