/*
 * Copyright (c) 2012 Big Switch Networks, Inc.
 *
 * Licensed under the Eclipse Public License, Version 1.0 (the
 * "License"); you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at
 *
 *      http://www.eclipse.org/legal/epl-v10.html
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 *    Originally created by David Erickson, Stanford University
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the
 *    License. You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing,
 *    software distributed under the License is distributed on an "AS
 *    IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 *    express or implied. See the License for the specific language
 *    governing permissions and limitations under the License.
 */

package org.opendaylight.controller.hosttracker.internal;

import java.util.Arrays;
import java.util.Iterator;

import org.opendaylight.controller.hosttracker.IEntityClass;
import org.opendaylight.controller.hosttracker.SwitchPort;
import org.opendaylight.controller.sal.core.NodeConnector;
import org.opendaylight.controller.sal.utils.FilterIterator;

/**
 * An iterator for handling device queries
 */
public class DeviceIterator extends FilterIterator<Device> {
    private IEntityClass[] entityClasses;

    private Long macAddress;
    private Short vlan;
    private Integer ipv4Address;
    private NodeConnector port;

    /**
     * Construct a new device iterator over the key fields
     *
     * @param subIterator
     *            an iterator over the full data structure to scan
     * @param entityClasses
     *            the entity classes to search for
     * @param macAddress
     *            The MAC address
     * @param vlan
     *            the VLAN
     * @param ipv4Address
     *            the ipv4 address
     * @param switchDPID
     *            the switch DPID
     * @param switchPort
     *            the switch port
     */
    public DeviceIterator(Iterator<Device> subIterator,
            IEntityClass[] entityClasses, Long macAddress, Short vlan,
            Integer ipv4Address, NodeConnector port) {
        super(subIterator);
        this.entityClasses = entityClasses;
        this.subIterator = subIterator;
        this.macAddress = macAddress;
        this.vlan = vlan;
        this.ipv4Address = ipv4Address;
        this.port = port;
    }

    @Override
    protected boolean matches(Device value) {
        boolean match;
        if (entityClasses != null) {
            IEntityClass clazz = value.getEntityClass();
            if (clazz == null)
                return false;

            match = false;
            for (IEntityClass entityClass : entityClasses) {
                if (clazz.equals(entityClass)) {
                    match = true;
                    break;
                }
            }
            if (!match)
                return false;
        }
        if (macAddress != null) {
            if (macAddress.longValue() != value.getMACAddress())
                return false;
        }
        if (vlan != null) {
            Short[] vlans = value.getVlanId();
            if (Arrays.binarySearch(vlans, vlan) < 0)
                return false;
        }
        if (ipv4Address != null) {
            Integer[] ipv4Addresses = value.getIPv4Addresses();
            if (Arrays.binarySearch(ipv4Addresses, ipv4Address) < 0)
                return false;
        }
        if (port != null) {
            SwitchPort[] sps = value.getAttachmentPoints();
            if (sps == null)
                return false;

            match = false;
            for (SwitchPort sp : sps) {
                if (sp.getPort().equals(sp.getPort())) {
                    match = true;
                    break;
                }
            }
            if (!match)
                return false;
        }
        return true;
    }
}