jnidzwetzki/bitfinex-v2-wss-api-java

/*******************************************************************************
 *
 *    Copyright (C) 2015-2018 Jan Kristof Nidzwetzki
 *
 *    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 com.github.jnidzwetzki.bitfinex.v2.command;

import java.util.Objects;
import java.util.function.Function;

import org.json.JSONObject;

import com.github.jnidzwetzki.bitfinex.v2.BitfinexWebsocketClient;
import com.github.jnidzwetzki.bitfinex.v2.symbol.BitfinexStreamSymbol;
import com.github.jnidzwetzki.bitfinex.v2.util.BitfinexStreamSymbolToChannelIdResolverAware;

public class UnsubscribeChannelCommand implements BitfinexCommand, BitfinexStreamSymbolToChannelIdResolverAware {

    /**
     * The channel to unsubscribe
     */
    private final BitfinexStreamSymbol symbol;
    private Function<BitfinexStreamSymbol, Integer> channelIdResolver = s -> {
        throw new IllegalStateException("Resolver is not set");
    };

    public UnsubscribeChannelCommand(final BitfinexStreamSymbol symbol) {
        this.symbol = symbol;
    }

    @Override
    public String getCommand(final BitfinexWebsocketClient client) {
        final JSONObject subscribeJson = new JSONObject();
        subscribeJson.put("event", "unsubscribe");
        subscribeJson.put("chanId", channelIdResolver.apply(symbol));

        return subscribeJson.toString();
    }

    public BitfinexStreamSymbol getSymbol() {
        return symbol;
    }

    @Override
    public void setResolver(Function<BitfinexStreamSymbol, Integer> channelIdResolver) {
        this.channelIdResolver = Objects.requireNonNull(channelIdResolver);
    }
}