ManualProxySelectorProvider.java

/*******************************************************************************
 * Copyright (c) 2007, 2008 compeople AG and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * 	compeople AG (Stefan Liebig) - initial API and implementation
 *******************************************************************************/
package de.compeople.commons.net.proxy;

import java.net.Proxy;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Strings;

/**
 * Provide the manual proxy settings if given.
 */
public final class ManualProxySelectorProvider {

    /**
     * If the value of manual proxy settings property is DIRECT than the manual
     * proxy selector will select no proxy!
     */
    public static final String DIRECT = "DIRECT";

    /**
     * The system property for defining a manual proxy setting.
     */
    public final static String MANUAL_PROXY_SETTINGS_PROPERTY = "commons.proxy";

    private static final Logger log = LoggerFactory.getLogger(ManualProxySelectorProvider.class);

    /**
     * Append a manual proxy selector to the CompoundProxySelector
     * 
     * @param compoundProxySelector
     */
    public static void appendTo(CompoundProxySelector compoundProxySelector) {
        String proxyList = System.getProperty(MANUAL_PROXY_SETTINGS_PROPERTY);
        if (!Strings.isNullOrEmpty(proxyList)) {
            List<Proxy> universalProxies = new ArrayList<Proxy>();
            Map<String, List<Proxy>> protocolSpecificProxies = new HashMap<String, List<Proxy>>();

            if (!proxyList.equalsIgnoreCase(DIRECT)) {
                // if not �direct� requested fill the list from the spec.
                ProxySelectorUtils.fillProxyLists(proxyList, universalProxies, protocolSpecificProxies);
            }

            ManualProxySelector manualProxySelector = new ManualProxySelector(universalProxies, protocolSpecificProxies);

            compoundProxySelector.addOrReplace(100, manualProxySelector);
        } else {
            log.debug("No manual proxy (-D{}=... )selector requested.", MANUAL_PROXY_SETTINGS_PROPERTY);
        }
    }
}