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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2015 The Netty Project
 *
 * The Netty Project licenses this file to you 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:
 *
 *   https://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 io.netty.handler.codec;

import static io.netty.util.internal.ObjectUtil.checkNotNull;

/**
 * Result of detecting a protocol.
 *
 * @param  the type of the protocol
 */
public final class ProtocolDetectionResult {

    @SuppressWarnings({ "rawtypes", "unchecked" })
    private static final ProtocolDetectionResult NEEDS_MORE_DATA =
            new ProtocolDetectionResult(ProtocolDetectionState.NEEDS_MORE_DATA, null);
    @SuppressWarnings({ "rawtypes", "unchecked" })
    private static final ProtocolDetectionResult INVALID =
            new ProtocolDetectionResult(ProtocolDetectionState.INVALID, null);

    private final ProtocolDetectionState state;
    private final T result;

    /**
     * Returns a {@link ProtocolDetectionResult} that signals that more data is needed to detect the protocol.
     */
    @SuppressWarnings("unchecked")
    public static  ProtocolDetectionResult needsMoreData() {
        return NEEDS_MORE_DATA;
    }

    /**
     * Returns a {@link ProtocolDetectionResult} that signals the data was invalid for the protocol.
     */
    @SuppressWarnings("unchecked")
    public static  ProtocolDetectionResult invalid() {
        return INVALID;
    }

    /**
     * Returns a {@link ProtocolDetectionResult} which holds the detected protocol.
     */
    @SuppressWarnings("unchecked")
    public static  ProtocolDetectionResult detected(T protocol) {
        return new ProtocolDetectionResult(ProtocolDetectionState.DETECTED, checkNotNull(protocol, "protocol"));
    }

    private ProtocolDetectionResult(ProtocolDetectionState state, T result) {
        this.state = state;
        this.result = result;
    }

    /**
     * Return the {@link ProtocolDetectionState}. If the state is {@link ProtocolDetectionState#DETECTED} you
     * can retrieve the protocol via {@link #detectedProtocol()}.
     */
    public ProtocolDetectionState state() {
        return state;
    }

    /**
     * Returns the protocol if {@link #state()} returns {@link ProtocolDetectionState#DETECTED}, otherwise {@code null}.
     */
    public T detectedProtocol() {
        return result;
    }
}