com.moilioncircle.redis.replicator.cmd.parser.XTrimParser Maven / Gradle / Ivy

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/*
 * Copyright 2016-2018 Leon Chen
 *
 * 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.moilioncircle.redis.replicator.cmd.parser;

import com.moilioncircle.redis.replicator.cmd.CommandParser;
import com.moilioncircle.redis.replicator.cmd.impl.Limit;
import com.moilioncircle.redis.replicator.cmd.impl.MaxLen;
import com.moilioncircle.redis.replicator.cmd.impl.MinId;
import com.moilioncircle.redis.replicator.cmd.impl.XTrimCommand;

import java.util.Objects;

import static com.moilioncircle.redis.replicator.cmd.CommandParsers.toBytes;
import static com.moilioncircle.redis.replicator.cmd.CommandParsers.toLong;
import static com.moilioncircle.redis.replicator.cmd.CommandParsers.toRune;
import static com.moilioncircle.redis.replicator.util.Strings.isEquals;

/**
 * @author Leon Chen
 * @since 2.6.0
 */
public class XTrimParser implements CommandParser {
    @Override
    public XTrimCommand parse(Object[] command) {
        int idx = 1;
        byte[] key = toBytes(command[idx]);
        idx++;
        MaxLen maxLen = null;
        MinId minId = null;
        Limit limit = null;
        for (; idx < command.length; idx++) {
            String token = toRune(command[idx]);
            if (isEquals(token, "MAXLEN")) {
                idx++;
                boolean approximation = false;
                if (Objects.equals(toRune(command[idx]), "~")) {
                    approximation = true;
                    idx++;
                } else if (Objects.equals(toRune(command[idx]), "=")) {
                    idx++;
                }
                long count = toLong(command[idx]);
                maxLen = new MaxLen(approximation, count);
            } else if (isEquals(token, "MINID")) {
                idx++;
                boolean approximation = false;
                if (Objects.equals(toRune(command[idx]), "~")) {
                    approximation = true;
                    idx++;
                } else if (Objects.equals(toRune(command[idx]), "=")) {
                    idx++;
                }
                byte[] mid = toBytes(command[idx]);
                minId = new MinId(approximation, mid);
            } else if (isEquals(token, "LIMIT")) {
                idx++;
                long count = toLong(command[idx]);
                limit = new Limit(0, count);
            }
        }
        
        return new XTrimCommand(key, maxLen, minId, limit);
    }
}