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Aerospike v3 Scala Client
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/*******************************************************************************
 * Copyright 2012-2014 by Aerospike.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 ******************************************************************************/
package com.aerospike.client.command;

import java.io.IOException;

import com.aerospike.client.AerospikeException;
import com.aerospike.client.Key;
import com.aerospike.client.Record;
import com.aerospike.client.ResultCode;
import com.aerospike.client.cluster.Cluster;
import com.aerospike.client.cluster.Connection;
import com.aerospike.client.policy.Policy;

public class ReadHeaderCommand extends SingleCommand {
	private final Policy policy;
	private Record record;

	public ReadHeaderCommand(Cluster cluster, Policy policy, Key key) {
		super(cluster, key);
		this.policy = (policy == null) ? new Policy() : policy;
	}
	
	@Override
	protected Policy getPolicy() {
		return policy;
	}

	@Override
	protected void writeBuffer() throws AerospikeException {
		setReadHeader(key);
	}

	protected void parseResult(Connection conn) throws AerospikeException, IOException {
		// Read header.		
		conn.readFully(dataBuffer, MSG_TOTAL_HEADER_SIZE);

		int resultCode = dataBuffer[13] & 0xFF;

        if (resultCode == 0) {
    		int generation = Buffer.bytesToInt(dataBuffer, 14);
    		int expiration = Buffer.bytesToInt(dataBuffer, 18);
        	record = new Record(null, null, generation, expiration);       	
        }
        else {
			if (resultCode == ResultCode.KEY_NOT_FOUND_ERROR) {
				record = null;
			}
			else {
				throw new AerospikeException(resultCode);
			}
		}
		emptySocket(conn);
	}
	
	public Record getRecord() {
		return record;
	}
}