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

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Here is the source code for cn.com.crcement.oa.base.download.progress.ProgressResponseBody.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.ResponseBody;

import okio.Buffer;
import okio.BufferedSource;
import okio.ForwardingSource;
import okio.Okio;
import okio.Source;

/**
 * ?? User:lizhangqu(513163535@qq.com) Date:2015-09-02 Time: 17:18
 */
public class ProgressResponseBody extends ResponseBody {
    // ?
    private final ResponseBody responseBody;
    // ?
    private final ProgressListener progressListener;
    // ?BufferedSource
    private BufferedSource bufferedSource;

    /**
     * 
     * 
     * @param responseBody
     *            ?
     * @param progressListener
     *            ?
     */
    public ProgressResponseBody(ResponseBody responseBody, ProgressListener progressListener) {
        this.responseBody = responseBody;
        this.progressListener = progressListener;
    }

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

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

    /**
     * ?source
     * 
     * @return BufferedSource
     * @throws IOException
     *             
     */
    @Override
    public BufferedSource source() throws IOException {
        if (bufferedSource == null) {
            // 
            bufferedSource = Okio.buffer(source(responseBody.source()));
        }
        return bufferedSource;
    }

    /**
     * ??
     * 
     * @param source
     *            Source
     * @return Source
     */
    private Source source(Source source) {

        return new ForwardingSource(source) {
            // ??
            long totalBytesRead = 0L;

            @Override
            public long read(Buffer sink, long byteCount) throws IOException {
                long bytesRead = super.read(sink, byteCount);
                // ????bytesRead-1
                totalBytesRead += bytesRead != -1 ? bytesRead : 0;
                // contentLength()??-1
                if (progressListener != null) {
                    progressListener.onProgress(totalBytesRead, responseBody.contentLength(), bytesRead == -1);
                }
                return bytesRead;
            }
        };
    }
}