ipv4networkinterface.java

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//
// This file is part of the OpenNMS(R) Application.
//
// OpenNMS(R) is Copyright (C) 2002-2003 The OpenNMS Group, Inc.  All rights reserved.
// OpenNMS(R) is a derivative work, containing both original code, included code and modified
// code that was published under the GNU General Public License. Copyrights for modified 
// and included code are below.
//
// OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.
//
// Modifications:
//
// 2003 Jan 31: Cleaned up some unused imports.
//
// Original code base Copyright (C) 1999-2001 Oculan Corp.  All rights reserved.
//
// 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// For more information contact:
//      OpenNMS Licensing       <[e-mail]>
//      http://www.opennms.org/
//      http://www.opennms.com/
//

package org.opennms.netmgt.poller.monitors;

import java.net.InetAddress;
import java.util.HashMap;
import java.util.Map;

/**
 * <P>
 * The NetworkInterface class is designed to be a well defined front for passing
 * interfaces to a service monitor. There are many different types of network in
 * use today including IPv4, IPv6, IPX, and others. To accomidate the possible
 * differences this class provides the basic information that a monitor can use
 * to determine the type of interface and its expected address type.
 * </P>
 * 
 * <P>
 * In addition to providing typing and address information, the interface allows
 * for the monitor to associate key-value pairs with an interface. This can be
 * used to save state information between the various invocations if neccessary.
 * The attributes may be shared with other monitors concurrently, so a monitor
 * must be careful to choose unique keys to prevent namespace collisions.
 * </P>
 * 
 * @author <A HREF="mailto:[e-mail]">Mike Davidson </A>
 * @author <A HREF="mailto:[e-mail]">Weave </A>
 * @author <A HREF="http://www.opennms.org/">OpenNMS </A>
 * 
 */
public class IPv4NetworkInterface implements NetworkInterface {
    /**
     * The map of attributes for this interface.
     */
    private Map m_properties;

    /**
     * Interface address
     */
    protected InetAddress m_address;
    
    public IPv4NetworkInterface(InetAddress address) {
        m_address = address;
    }

    /**
     * <P>
     * Returns the interface type for the network interface.
     * </P>
     */
    public int getType() {
        return TYPE_IPV4;
    }

    /**
     * <P>
     * Returns the address information for the interface. If the interface then
     * this should be either an InetAddress or an object for specialized address
     * types.
     * </p>
     */
    public Object getAddress() {
        return m_address;
    }

    /**
     * <P>
     * This method is used to return the object that is associated with the
     * property name. This is very similar to the java.util.Map get() method,
     * but requires that the lookup be performed using a String name. The object
     * may be of any instance that the monitor previous stored.
     * </P>
     * 
     * <P>
     * If there is no matching object for the property key, then a null pointer
     * is returned to the application.
     * </P>
     * 
     * @param property
     *            The key for the lookup.
     * 
     * @return The resulting value for the key, null if no value exist.
     * 
     * @exception java.lang.IllegalArgumentException
     *                Thrown if the passed key is empty or null.
     * 
     * @see java.util.Map#get(java.lang.Object)
     */
    public synchronized Object getAttribute(String property) {
        Object rc = null;
        if (m_properties != null)
            rc = m_properties.get(property);

        return rc;
    }

    /**
     * <P>
     * This method is used to associate an object value with a textual key. If a
     * previous value was associated with the key then the old value is returned
     * to the caller. This is identical to the behavior defined by the
     * java.util.Map put() method. The only restriction is that the key must be
     * a java string instance.
     * </P>
     * 
     * @param property
     *            The key
     * @param value
     *            The value to associate with the key
     * 
     * @return The object that was previously associated with the key. Null is
     *         returned if there was no previous value associated.
     * 
     * @exception java.lang.IllegalArgumentException
     *                Thrown if the property name is empty or null.
     * 
     * @see java.util.Map#put(java.lang.Object, java.lang.Object)
     * 
     */
    public synchronized Object setAttribute(String property, Object value) {
        if (m_properties == null)
            m_properties = new HashMap();

        return m_properties.put(property, value);
    }
}