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Java client for Arcus memcached

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package net.spy.memcached.protocol.binary;

import java.util.Collection;
import java.util.Collections;

import net.spy.memcached.ops.GetOperation;
import net.spy.memcached.ops.GetsOperation;
import net.spy.memcached.ops.OperationStatus;

class GetOperationImpl extends OperationImpl
        implements GetOperation, GetsOperation {

  static final int CMD = 0;

  /**
   * Length of the extra header stuff for a GET response.
   */
  static final int EXTRA_HDR_LEN = 4;

  private final String key;

  public GetOperationImpl(String k, GetOperation.Callback cb) {
    super(CMD, generateOpaque(), cb);
    key = k;
  }

  public GetOperationImpl(String k, GetsOperation.Callback cb) {
    super(CMD, generateOpaque(), cb);
    key = k;
  }

  @Override
  public void initialize() {
    prepareBuffer(key, 0, EMPTY_BYTES);
  }

  @Override
  protected void decodePayload(byte[] pl) {
    final int flags = decodeInt(pl, 0);
    final byte[] data = new byte[pl.length - EXTRA_HDR_LEN];
    System.arraycopy(pl, EXTRA_HDR_LEN, data, 0, pl.length - EXTRA_HDR_LEN);
    // Assume we're processing a get unless the cast fails.
    try {
      GetOperation.Callback cb = (GetOperation.Callback) getCallback();
      cb.gotData(key, flags, data);
    } catch (ClassCastException e) {
      GetsOperation.Callback cb = (GetsOperation.Callback) getCallback();
      cb.gotData(key, flags, responseCas, data);
    }
    getCallback().receivedStatus(STATUS_OK);
  }

  @Override
  protected OperationStatus getStatusForErrorCode(int errCode, byte[] errPl) {
    return errCode == ERR_NOT_FOUND ? NOT_FOUND_STATUS : null;
  }

  public Collection getKeys() {
    return Collections.singleton(key);
  }

  @Override
  public boolean isBulkOperation() {
    return false;
  }

  @Override
  public boolean isPipeOperation() {
    return false;
  }
}