/
LastfmMetaTask.java
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/
LastfmMetaTask.java
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/*
* Copyright (C) 2009 Josh Guilfoyle <jasta@devtcg.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
package org.devtcg.five.meta;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.devtcg.five.util.HttpUtils;
import org.devtcg.five.util.IOUtils;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.XMLReaderFactory;
public abstract class LastfmMetaTask implements Callable<Object>
{
protected static final Log LOG = LogFactory.getLog(LastfmMetaTask.class);
private static final String API_KEY = "3edc5156fb5dc2d185c1f00ba0282ea5";
protected static final String LASTFM_CALL_URL = "http://ws.audioscrobbler.com/2.0/?api_key=" + API_KEY;
protected static final HttpClient mClient = HttpUtils.newHttpClient();
protected static final int THUMB_WIDTH = 64;
protected static final int THUMB_HEIGHT = 64;
protected final MetaProvider mProvider;
private final FutureTask<?> mTask;
protected final long mId;
protected DefaultHandler mXmlHandler;
public LastfmMetaTask(MetaProvider provider, long id)
{
mProvider = provider;
mTask = new FutureTask<Object>(this);
mId = id;
}
public FutureTask<?> getTask()
{
return mTask;
}
public Object call() throws Exception
{
try {
run();
} catch (Exception e) {
if (LOG.isWarnEnabled())
LOG.warn("Error accessing Last.fm", e);
}
return null;
}
protected abstract String getMethodUrl();
protected abstract DefaultHandler getContentHandler();
protected abstract void onPostParse();
public void run() throws Exception
{
System.out.println("Accessing " + getMethodUrl());
HttpGet request = new HttpGet(getMethodUrl());
HttpResponse response = mClient.execute(request);
if (mTask.isCancelled())
return;
if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK)
{
if (LOG.isWarnEnabled())
LOG.warn(getMethodUrl() + " replied " + response.getStatusLine());
response.getEntity().consumeContent();
return;
}
HttpEntity entity = response.getEntity();
InputStream in = entity.getContent();
try {
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setContentHandler(getContentHandler());
reader.parse(new InputSource(in));
} finally {
IOUtils.closeQuietlyNullSafe(in);
}
if (mTask.isCancelled())
return;
onPostParse();
}
protected byte[] downloadImage(String url) throws IOException
{
System.out.println("Fetching " + url);
HttpGet request = new HttpGet(url);
HttpResponse response = mClient.execute(request);
if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK)
{
if (LOG.isWarnEnabled())
LOG.warn(url + " replied " + response.getStatusLine());
response.getEntity().consumeContent();
return null;
}
HttpEntity entity = response.getEntity();
ByteArrayOutputStream out =
new ByteArrayOutputStream((int)entity.getContentLength());
InputStream in = entity.getContent();
try {
IOUtils.copyStream(in, out);
return out.toByteArray();
} finally {
IOUtils.closeQuietlyNullSafe(in);
}
}
}