nz.net.kallisti.emusicj.network.http.proxy.HttpClientProvider.java Source code

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Here is the source code for nz.net.kallisti.emusicj.network.http.proxy.HttpClientProvider.java

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/*
eMusic/J - a Free software download manager for emusic.com
http://www.kallisti.net.nz/emusicj
    
Copyright (C) 2005-2009 Robin Sheat
    
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 of the License, 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.
    
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    
 */
package nz.net.kallisti.emusicj.network.http.proxy;

import nz.net.kallisti.emusicj.controller.IPreferences;

import org.apache.commons.httpclient.HostConfiguration;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpState;
import org.apache.commons.httpclient.auth.CredentialsProvider;

import com.google.inject.Inject;

/**
 * <p>
 * This is the default HttpClient provider for the system. It will create and
 * initialise the state as needed, including all the proxy-related information.
 * </p>
 * 
 * @author robin
 */
public class HttpClientProvider implements IHttpClientProvider {

    // volatile makes double-checked locking OK
    private volatile HttpState globalState;
    private final CredentialsProvider proxyCredsProvider;
    private final IPreferences prefs;

    @Inject
    public HttpClientProvider(CredentialsProvider proxyCredsProvider, IPreferences prefs) {
        this.proxyCredsProvider = proxyCredsProvider;
        this.prefs = prefs;
    }

    public HttpClient getHttpClient() {
        HttpState state = getState();
        HttpClient client = new HttpClient();
        client.setState(state);
        if (!prefs.getProxyHost().equals("") && prefs.usingProxy()) {
            HostConfiguration hostConf = new HostConfiguration();
            hostConf.setProxy(prefs.getProxyHost(), prefs.getProxyPort());
            client.setHostConfiguration(hostConf);
            client.getParams().setParameter(CredentialsProvider.PROVIDER, proxyCredsProvider);
        }
        return client;
    }

    HttpState getState() {
        if (globalState != null)
            return globalState;
        synchronized (this) {
            if (globalState != null)
                return globalState;
            HttpState state = new HttpState();
            // Any state configuration needed will occur here
            globalState = state;
        }
        return globalState;
    }

}