com.rogiel.httpchannel.service.AbstractHttpDownloader.java Source code

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Here is the source code for com.rogiel.httpchannel.service.AbstractHttpDownloader.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.rogiel.httpchannel.service;

import java.io.IOException;
import java.net.URI;

import org.apache.commons.io.FilenameUtils;
import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.rogiel.httpchannel.http.Request;
import com.rogiel.httpchannel.service.DownloadListener;
import com.rogiel.httpchannel.service.DownloadService;
import com.rogiel.httpchannel.service.Downloader;
import com.rogiel.httpchannel.service.Downloader.DownloaderConfiguration;
import com.rogiel.httpchannel.service.channel.InputStreamDownloadChannel;
import com.rogiel.httpchannel.service.exception.DownloadLinkNotFoundException;
import com.rogiel.httpchannel.util.ThreadUtils;

/**
 * @author <a href="http://www.rogiel.com">Rogiel</a>
 */
public abstract class AbstractHttpDownloader<C extends DownloaderConfiguration> extends AbstractDownloader<C>
        implements Downloader<C> {
    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    protected AbstractHttpDownloader(DownloadService<?> service, URI uri, C configuration) {
        super(service, uri, configuration);
    }

    protected long getContentLength(HttpResponse response) {
        final Header contentLengthHeader = response.getFirstHeader("Content-Length");
        long contentLength = -1;
        if (contentLengthHeader != null) {
            contentLength = Long.valueOf(contentLengthHeader.getValue());
        }
        return contentLength;
    }

    protected void timer(DownloadListener listener, long timer) {
        if (listener != null) {
            if (!listener.timer(timer))
                return;
        }
        logger.debug("Download timer waiting {}", timer);
        ThreadUtils.sleep(timer);
    }

    protected InputStreamDownloadChannel download(Request request) throws IOException {
        final HttpResponse response = request.request();
        if (!(response.getStatusLine().getStatusCode() == HttpStatus.SC_OK
                || response.getStatusLine().getStatusCode() == HttpStatus.SC_NOT_MODIFIED
                || response.getStatusLine().getStatusCode() == HttpStatus.SC_PARTIAL_CONTENT))
            throw new DownloadLinkNotFoundException();

        final String filename = FilenameUtils.getName(request.getURI());
        final long contentLength = getContentLength(response);
        return createInputStreamChannel(response.getEntity().getContent(), contentLength, filename);
    }
}