com.yandex.disk.rest.RequestBodyProgress Maven / Gradle / Ivy

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/*
* Copyright (c) 2015 Yandex
*
* 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 com.yandex.disk.rest;

import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.internal.Util;
import com.yandex.disk.rest.exceptions.CancelledUploadingException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import okio.Buffer;
import okio.BufferedSink;
import okio.Okio;
import okio.Source;

/* package */ abstract class RequestBodyProgress {

    private static final Logger logger = LoggerFactory.getLogger(RequestBodyProgress.class);

    private static final int SIZE = 2048;

    /**
     * Returns a new request body that transmits the content of {@code file}.
     * 

     * Based on {@link RequestBody#create(com.squareup.okhttp.MediaType, java.io.File)}
     *
     * @see RequestBody#create(com.squareup.okhttp.MediaType, java.io.File)
     */
    /* package */ static RequestBody create(final MediaType contentType, final File file, final long startOffset,
                              final ProgressListener listener) {
        if (file == null) {
            throw new NullPointerException("content == null");
        }

        if (listener == null && startOffset == 0) {
            return RequestBody.create(contentType, file);
        }

        return new RequestBody() {

            private void updateProgress(long loaded)
                    throws CancelledUploadingException {
                if (listener != null) {
                    if (listener.hasCancelled()) {
                        throw new CancelledUploadingException();
                    }
                    listener.updateProgress(loaded + startOffset, file.length());
                }
            }

            @Override
            public MediaType contentType() {
                return contentType;
            }

            @Override
            public long contentLength() {
                return file.length() - startOffset;
            }

            @Override
            public void writeTo(BufferedSink sink) throws IOException {
                Source source = null;
                InputStream inputStream = new FileInputStream(file);
                try {
                    if (startOffset > 0) {
                        long skipped = inputStream.skip(startOffset);
                        if (skipped != startOffset) {
                            throw new IOException("RequestBodyProgress: inputStream.skip() failed");
                        }
                    }
                    long loaded = 0;
                    updateProgress(loaded);
                    source = Okio.source(inputStream);
                    Buffer buffer = new Buffer();
                    for (long readCount; (readCount = source.read(buffer, SIZE)) != -1; ) {
                        sink.write(buffer, readCount);
                        loaded += readCount;
                        updateProgress(loaded);
                    }
                    logger.debug("loaded: " + loaded);
                } finally {
                    Util.closeQuietly(source);
                    Util.closeQuietly(inputStream);
                }
            }
        };
    }
}