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SilverTunnel-NG Netlib is a free library for the Java programming language that implements and encapsulates all the complex network protocol stuff needed for anonymous communication over the Tor anonymity network. Netlib can be easily integrated in almost every existing and new Java application. The library requires Java 1.6/Java SE 6 or a newer version. The original silvertunnel Netlib can be found here : silvertunnel.org

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/*
 * silvertunnel.org Netlib - Java library to easily access anonymity networks
 * Copyright (c) 2009-2012 silvertunnel.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 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, see .
 */

package org.silvertunnel_ng.netlib.util;

import java.util.Map;

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

/**
 * Support for handling (local)properties.
 * 
 * @author hapke
 */
public class PropertiesUtil
{
	/** */
	private static final Logger LOG = LoggerFactory.getLogger(PropertiesUtil.class);
	private static final String LIST_SEPARATOR = ",";

	/**
	 * Try to return an Object.
	 * 
	 * @param properties
	 *            can be null
	 * @param key
	 *            not null
	 * @param defaultValue
	 *            can be null
	 * @return
	 */
	public static Object getAsObject(Map properties,
			String key, Object defaultValue)
	{
		if (properties == null)
		{
			return defaultValue;
		}

		return properties.get(key);
	}

	/**
	 * Try to return a String[]. If the value is of a different type then try to
	 * parse it as comma separated String.
	 * 
	 * @param properties
	 *            can be null
	 * @param key
	 *            not null
	 * @param defaultValue
	 *            can be null
	 * @return
	 */
	public static String[] getAsStringArray(Map properties,
			final String key, final String[] defaultValue)
	{
		if (properties == null)
		{
			return defaultValue;
		}

		final Object value = properties.get(key);

		// process property value
		if (value == null)
		{
			return defaultValue;
		}
		if (value instanceof String[])
		{
			return (String[]) value;
		}
		return value.toString().split(LIST_SEPARATOR);
	}

	/**
	 * Try to return a String.
	 * 
	 * @param properties
	 *            can be null
	 * @param key
	 *            not null
	 * @param defaultValue
	 *            can be null
	 * @return
	 */
	public static String getAsString(Map properties,
			String key, String defaultValue)
	{
		if (properties == null)
		{
			return defaultValue;
		}

		final Object value = properties.get(key);

		// process property value
		if (value == null)
		{
			return defaultValue;
		}
		return value.toString();
	}

	/**
	 * Try to return a Long.
	 * 
	 * @param properties
	 *            can be null
	 * @param key
	 *            not null
	 * @param defaultValue
	 *            can be null
	 * @return
	 */
	public static Long getAsLong(Map properties, final String key,
			final Long defaultValue)
	{
		if (properties == null)
		{
			return defaultValue;
		}

		final Object obj = properties.get(key);
		if (obj instanceof Long)
		{
			return (Long) obj;
		}
		else if (obj instanceof Integer)
		{
			return ((Integer) obj).longValue();
		}
		else if (obj instanceof Short)
		{
			return ((Short) obj).longValue();
		}
		else if (obj instanceof Byte)
		{
			return ((Byte) obj).longValue();
		}
		else if (obj instanceof String)
		{
			try
			{
				final String s = (String) obj;
				return Long.valueOf(s);
			}
			catch (final Exception e)
			{
				// ignore it
				LOG.debug("got Exception : {}", e.getMessage(), e);
			}
		}

		return defaultValue;
	}

	/**
	 * Try to return a Integer.
	 * 
	 * @param properties
	 *            can be null
	 * @param key
	 *            not null
	 * @param defaultValue
	 *            can be null
	 * @return
	 */
	public static Integer getAsInteger(Map properties,
			String key, final Integer defaultValue)
	{
		if (properties == null)
		{
			return defaultValue;
		}

		final Object obj = properties.get(key);
		if (obj instanceof Integer)
		{
			return (Integer) obj;
		}
		else if (obj instanceof Long)
		{
			return ((Long) obj).intValue();
		}
		else if (obj instanceof Short)
		{
			return ((Short) obj).intValue();
		}
		else if (obj instanceof Byte)
		{
			return ((Byte) obj).intValue();
		}
		else if (obj instanceof String)
		{
			try
			{
				final String s = (String) obj;
				return Integer.valueOf(s);
			}
			catch (final Exception e)
			{
				// ignore it
				LOG.debug("got Exception : {}", e.getMessage(), e);
			}
		}

		return defaultValue;
	}

	/*
	 * TODO: check how to implement this correctly public static  T
	 * getAsType(Map properties, String key, T defaultValue) {
	 * Object value = properties.get(key);
	 * 
	 * if (value==null) { return defaultValue; }
	 * 
	 * try { return (T)value; } }
	 */
}