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Java client for Arcus memcached

There is a newer version: 1.13.2

/*
 * arcus-java-client : Arcus Java client
 * Copyright 2010-2014 NAVER Corp.
 *
 * 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 net.spy.memcached.collection;

import net.spy.memcached.ops.Mutator;
import net.spy.memcached.util.BTreeUtil;

public class BTreeMutate extends CollectionMutate {

	private final String command;
	
	protected final Mutator m;

	protected final int by;

	protected long initial = -1;

	protected byte[] elementFlag;

	public BTreeMutate(Mutator m, int by) {
		if (by <= 0) {
			throw new IllegalArgumentException("by must be positive value.");
		}

		if (Mutator.incr == m) {
			command = "bop incr";
		} else {
			command = "bop decr";
		}

		this.m = m;
		this.by = by;
	}

	public BTreeMutate(Mutator m, int by, long initial, byte[] eFlag) {
		if (by <= 0) {
			throw new IllegalArgumentException("by must be positive value.");
		}
		if (initial < 0) {
			throw new IllegalArgumentException("initial must be 0 or positive value.");
		}
		if (eFlag != null && (eFlag.length < 1 || eFlag.length > ElementFlagFilter.MAX_EFLAG_LENGTH)) {
			throw new IllegalArgumentException(
					"length of eFlag must be between 1 and " + ElementFlagFilter.MAX_EFLAG_LENGTH + "." );
		}

		if (Mutator.incr == m) {
			command = "bop incr";
		} else {
			command = "bop decr";
		}

		this.m = m;
		this.by = by;
		this.initial = initial;
		this.elementFlag = eFlag;
	}
	
	public String stringify() {
		if (str != null)
			return str;

		StringBuilder b = new StringBuilder();
		b.append(by);

		if (initial > 0) b.append(" ").append(initial);
		if (elementFlag != null) b.append(" ").append(getElementFlagByHex());

		str = b.toString();
		return str;
	}

	public String getCommand() {
		return command;
	}
	
	public Mutator getMutator() {
		return this.m;
	}

	public String getElementFlagByHex() {
		return BTreeUtil.toHex(elementFlag);
	}
}