Proxy support about postgresql-embedded HOT 4 OPEN

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.UnknownHostException;
import java.util.Objects;

import de.flapdoodle.embed.process.config.store.IProxyFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HttpProxyFactory implements IProxyFactory {

	private static final Logger LOGGER = LoggerFactory.getLogger(HttpProxyFactory.class);

	@Override
	public Proxy createProxy() {
		ProxyConfiguration httpConfig = createProxyConfig("http");
		ProxyConfiguration httpsConfig = createProxyConfig("https");
		if (!httpConfig.isValid() && !httpsConfig.isValid()) {
			return Proxy.NO_PROXY;
		}
		if (httpsConfig.isValid()) {
			return configureProxy(httpsConfig);
		}
		return configureProxy(httpConfig);
	}

	private ProxyConfiguration createProxyConfig(String protocol) {
		return new ProxyConfiguration(System.getProperty(protocol + ".proxyHost"),
				System.getProperty(protocol + ".proxyPort"));
	}

	private Proxy configureProxy(ProxyConfiguration config) {
		try {
			Proxy proxy = new Proxy(Proxy.Type.HTTP,
					new InetSocketAddress(InetAddress.getByName(config.getHost()), config.getPort()));
			LOGGER.info("Using proxy " + config.getHost() + ":" + config.getPort());
			return proxy;
		} catch (UnknownHostException e) {
			LOGGER.error("Creating proxy failed, falling back to no proxy", e);
			return Proxy.NO_PROXY;
		}
	}

	private static class ProxyConfiguration {
		private final String host;

		private final String port;

		private ProxyConfiguration(String host, String port) {
			this.host = host;
			this.port = port;
		}

		private String getHost() {
			return host;
		}

		private Integer getPort() {
			return Integer.valueOf(port);
		}

		private boolean isValid() {
			return Objects.nonNull(host) && Objects.nonNull(port) && port.matches("[0-9]{4,5}");
		}
	}
}