KeyValueStreamingOutput.java

/*
 * Copyright 2011-2016 the original author or authors.
 *
 * 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.lambdaworks.redis.output;

import java.nio.ByteBuffer;

import com.lambdaworks.redis.codec.RedisCodec;

/**
 * Streaming-Output of Key Value Pairs. Returns the count of all Key-Value pairs (including null).
 * 
 * @param <K> Key type.
 * @param <V> Value type.
 * 
 * @author Mark Paluch
 */
public class KeyValueStreamingOutput<K, V> extends CommandOutput<K, V, Long> {
    private K key;
    private KeyValueStreamingChannel<K, V> channel;

    public KeyValueStreamingOutput(RedisCodec<K, V> codec, KeyValueStreamingChannel<K, V> channel) {
        super(codec, Long.valueOf(0));
        this.channel = channel;
    }

    @Override
    public void set(ByteBuffer bytes) {
        if (key == null) {
            key = codec.decodeKey(bytes);
            return;
        }

        V value = (bytes == null) ? null : codec.decodeValue(bytes);
        channel.onKeyValue(key, value);
        output = output.longValue() + 1;
        key = null;
    }
}