cn.com.crcement.oa.base.download.progress.ProgressRequestBody.java Source code

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Here is the source code for cn.com.crcement.oa.base.download.progress.ProgressRequestBody.java

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/**
 * Copyright 2015 ZhangQu Li
 * <p/>
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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 cn.com.crcement.oa.base.download.progress;

import java.io.IOException;

import cn.com.crcement.oa.base.download.listener.ProgressListener;
import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.RequestBody;

import okio.Buffer;
import okio.BufferedSink;
import okio.ForwardingSink;
import okio.Okio;
import okio.Sink;

/**
 * ? User:lizhangqu(513163535@qq.com) Date:2015-09-02 Time: 17:15
 */
public class ProgressRequestBody extends RequestBody {
    // 
    private final RequestBody requestBody;
    // ?
    private final ProgressListener progressListener;
    // ?BufferedSink
    private BufferedSink bufferedSink;

    /**
     * 
     * 
     * @param requestBody
     *            
     * @param progressListener
     *            ?
     */
    public ProgressRequestBody(RequestBody requestBody, ProgressListener progressListener) {
        this.requestBody = requestBody;
        this.progressListener = progressListener;
    }

    /**
     * ??contentType
     * 
     * @return MediaType
     */
    @Override
    public MediaType contentType() {
        return requestBody.contentType();
    }

    /**
     * ??contentLength
     * 
     * @return contentLength
     * @throws IOException
     *             
     */
    @Override
    public long contentLength() throws IOException {
        return requestBody.contentLength();
    }

    /**
     * ?
     * 
     * @param sink
     *            BufferedSink
     * @throws IOException
     *             
     */
    @Override
    public void writeTo(BufferedSink sink) throws IOException {
        if (bufferedSink == null) {
            // 
            bufferedSink = Okio.buffer(sink(sink));
        }
        // 
        requestBody.writeTo(bufferedSink);
        // flush?????
        bufferedSink.flush();

    }

    /**
     * ?
     * 
     * @param sink
     *            Sink
     * @return Sink
     */
    private Sink sink(Sink sink) {
        return new ForwardingSink(sink) {
            // ?
            long bytesWritten = 0L;
            // ??contentLength()
            long contentLength = 0L;

            @Override
            public void write(Buffer source, long byteCount) throws IOException {
                super.write(source, byteCount);
                if (contentLength == 0) {
                    // contentLength???
                    contentLength = contentLength();
                }
                // ?
                bytesWritten += byteCount;
                // 
                if (progressListener != null) {
                    progressListener.onProgress(bytesWritten, contentLength, bytesWritten == contentLength);
                }
            }
        };
    }
}