public class

FileUtil

extends java.lang.Object

 java.lang.Object

↳androidx.room.util.FileUtil

Gradle dependencies

compile group: 'androidx.room', name: 'room-runtime', version: '2.5.0-alpha01'

  • groupId: androidx.room
  • artifactId: room-runtime
  • version: 2.5.0-alpha01

Artifact androidx.room:room-runtime:2.5.0-alpha01 it located at Google repository (https://maven.google.com/)

Androidx artifact mapping:

androidx.room:room-runtime android.arch.persistence.room:runtime

Overview

File utilities for Room

Summary

Methods
public static voidcopy(java.nio.channels.ReadableByteChannel input, java.nio.channels.FileChannel output)

Copies data from the input channel to the output file channel.

from java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods

public static void copy(java.nio.channels.ReadableByteChannel input, java.nio.channels.FileChannel output)

Copies data from the input channel to the output file channel.

Parameters:

input: the input channel to copy.
output: the output channel to copy.

Source

/*
 * Copyright 2019 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package androidx.room.util;

import android.annotation.SuppressLint;
import android.os.Build;

import androidx.annotation.NonNull;
import androidx.annotation.RestrictTo;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.ReadableByteChannel;

/**
 * File utilities for Room
 *
 * @hide
 */
@RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
public class FileUtil {

    /**
     * Copies data from the input channel to the output file channel.
     *
     * @param input  the input channel to copy.
     * @param output the output channel to copy.
     * @throws IOException if there is an I/O error.
     */
    @SuppressLint("LambdaLast")
    public static void copy(@NonNull ReadableByteChannel input, @NonNull FileChannel output)
            throws IOException {
        try {
            if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
                output.transferFrom(input, 0, Long.MAX_VALUE);
            } else {
                InputStream inputStream = Channels.newInputStream(input);
                OutputStream outputStream = Channels.newOutputStream(output);
                int length;
                byte[] buffer = new byte[1024 * 4];
                while ((length = inputStream.read(buffer)) > 0) {
                    outputStream.write(buffer, 0, length);
                }
            }
            output.force(false);
        } finally {
            input.close();
            output.close();
        }
    }

    private FileUtil() {
    }
}