io.netty.handler.codec.redis.ArrayHeaderRedisMessage Maven / Gradle / Ivy
/*
* Copyright 2016 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.handler.codec.redis;
import io.netty.util.internal.StringUtil;
import io.netty.util.internal.UnstableApi;
/**
* Header of Redis Array Message.
*/
@UnstableApi
public class ArrayHeaderRedisMessage implements RedisMessage {
private final long length;
/**
* Creates a {@link ArrayHeaderRedisMessage} for the given {@code length}.
*/
public ArrayHeaderRedisMessage(long length) {
if (length < RedisConstants.NULL_VALUE) {
throw new RedisCodecException("length: " + length + " (expected: >= " + RedisConstants.NULL_VALUE + ")");
}
this.length = length;
}
/**
* Get length of this array object.
*/
public final long length() {
return length;
}
/**
* Returns whether the content of this message is {@code null}.
*
* @return indicates whether the content of this message is {@code null}.
*/
public boolean isNull() {
return length == RedisConstants.NULL_VALUE;
}
@Override
public String toString() {
return new StringBuilder(StringUtil.simpleClassName(this))
.append('[')
.append("length=")
.append(length)
.append(']').toString();
}
}