ch.rasc.wampspring.message.WelcomeMessage.java Source code

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Here is the source code for ch.rasc.wampspring.message.WelcomeMessage.java

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/**
 * Copyright 2014-2015 Ralph Schaer <ralphschaer@gmail.com>
 *
 * 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 ch.rasc.wampspring.message;

import java.io.IOException;
import java.io.StringWriter;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;

/**
 * When a WAMP client connects to a WAMP server, the very first message sent by the server
 * back to the client is this WELCOME message.
 *
 * <p>
 * Server-to-Client message
 *
 * @see <a href="http://wamp.ws/spec/wamp1/#welcome_message">WAMP specification</a>
 */
public class WelcomeMessage extends WampMessage {
    public static final int PROTOCOL_VERSION = 1;

    private final String sessionId;

    private final int protocolVersion;

    private final String serverIdent;

    public WelcomeMessage(String sessionId, String serverIdent) {
        super(WampMessageType.WELCOME);
        this.sessionId = sessionId;
        this.serverIdent = serverIdent;
        this.protocolVersion = PROTOCOL_VERSION;
    }

    public WelcomeMessage(JsonParser jp) throws IOException {
        super(WampMessageType.WELCOME);

        if (jp.nextToken() != JsonToken.VALUE_STRING) {
            throw new IOException();
        }
        this.sessionId = jp.getValueAsString();

        if (jp.nextToken() != JsonToken.VALUE_NUMBER_INT) {
            throw new IOException();
        }
        this.protocolVersion = jp.getValueAsInt();

        if (jp.nextToken() != JsonToken.VALUE_STRING) {
            throw new IOException();
        }
        this.serverIdent = jp.getValueAsString();

    }

    @Override
    public String getWebSocketSessionId() {
        return this.sessionId;
    }

    public int getProtocolVersion() {
        return this.protocolVersion;
    }

    public String getServerIdent() {
        return this.serverIdent;
    }

    @Override
    public String toJson(JsonFactory jsonFactory) throws IOException {
        try (StringWriter sw = new StringWriter(); JsonGenerator jg = jsonFactory.createGenerator(sw)) {
            jg.writeStartArray();
            jg.writeNumber(getTypeId());
            jg.writeString(this.sessionId);
            jg.writeNumber(this.protocolVersion);
            jg.writeString(this.serverIdent);
            jg.writeEndArray();
            jg.close();
            return sw.toString();
        }
    }

    @Override
    public String toString() {
        return "WelcomeMessage [sessionId=" + this.sessionId + ", protocolVersion=" + this.protocolVersion
                + ", serverIdent=" + this.serverIdent + "]";
    }

}