/*

 * Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.nio.ch.sctp;

import java.lang.annotation.Native;

/**

 * Wraps the actual message or notification so that it can be

 * set and returned from the native receive implementation.

 */

public class ResultContainer {

    /* static final ints so that they can be referenced from native */

    @Native static final int NOTHING = 0;

    @Native static final int MESSAGE = 1;

    @Native static final int SEND_FAILED = 2;

    @Native static final int ASSOCIATION_CHANGED = 3;

    @Native static final int PEER_ADDRESS_CHANGED = 4;

    @Native static final int SHUTDOWN = 5;

    private Object value;

    private int type;

    int type() {

        return type;

    }

    boolean hasSomething() {

        return type() != NOTHING;

    }

    boolean isNotification() {

        return type() != MESSAGE && type() != NOTHING ? true : false;

    }

    void clear() {

        type = NOTHING;

        value = null;

    }

    SctpNotification notification() {

        assert type() != MESSAGE && type() != NOTHING;

        return (SctpNotification) value;

    }

    MessageInfoImpl getMessageInfo() {

        assert type() == MESSAGE;

        if (value instanceof MessageInfoImpl)

            return (MessageInfoImpl) value;

        return null;

    }

    SendFailed getSendFailed() {

        assert type() == SEND_FAILED;

        if (value instanceof SendFailed)

            return (SendFailed) value;

        return null;

    }

    AssociationChange getAssociationChanged() {

        assert type() == ASSOCIATION_CHANGED;

        if (value instanceof AssociationChange)

            return (AssociationChange) value;

        return null;

    }

    PeerAddrChange getPeerAddressChanged() {

        assert type() == PEER_ADDRESS_CHANGED;

        if (value instanceof PeerAddrChange)

            return (PeerAddrChange) value;

        return null;

    }

    Shutdown getShutdown() {

        assert type() == SHUTDOWN;

        if (value instanceof Shutdown)

            return (Shutdown) value;

        return null;

    }

    @Override

    public String toString() {

        StringBuilder sb = new StringBuilder();

        sb.append("Type: ");

        switch (type) {

            case NOTHING:              sb.append("NOTHING");             break;

            case MESSAGE:              sb.append("MESSAGE");             break;

            case SEND_FAILED:          sb.append("SEND FAILED");         break;

            case ASSOCIATION_CHANGED:  sb.append("ASSOCIATION CHANGE");  break;

            case PEER_ADDRESS_CHANGED: sb.append("PEER ADDRESS CHANGE"); break;

            case SHUTDOWN:             sb.append("SHUTDOWN");            break;

            default :                  sb.append("Unknown result type");

        }

        sb.append(", Value: ");

        sb.append((value == null) ? "null" : value.toString());

        return sb.toString();

    }

}