/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF 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 org.apache.geode.redis.internal.executor;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import org.apache.geode.redis.internal.Coder;
import org.apache.geode.redis.internal.Command;
import org.apache.geode.redis.internal.ExecutionHandlerContext;
import org.apache.geode.redis.internal.RedisConstants;
import org.apache.geode.redis.internal.RedisConstants.ArityDef;
import org.apache.geode.redis.GeodeRedisServer;
public class ScanExecutor extends AbstractScanExecutor {
@Override
public void executeCommand(Command command, ExecutionHandlerContext context) {
List<byte[]> commandElems = command.getProcessedCommand();
if (commandElems.size() < 2) {
command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ArityDef.SCAN));
return;
}
String cursorString = command.getStringKey();
int cursor = 0;
Pattern matchPattern = null;
String globMatchString = null;
int count = DEFUALT_COUNT;
try {
cursor = Integer.parseInt(cursorString);
} catch (NumberFormatException e) {
command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ERROR_CURSOR));
return;
}
if (cursor < 0) {
command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ERROR_CURSOR));
return;
}
if (commandElems.size() > 3) {
try {
byte[] bytes = commandElems.get(2);
String tmp = Coder.bytesToString(bytes);
if (tmp.equalsIgnoreCase("MATCH")) {
bytes = commandElems.get(3);
globMatchString = Coder.bytesToString(bytes);
} else if (tmp.equalsIgnoreCase("COUNT")) {
bytes = commandElems.get(3);
count = Coder.bytesToInt(bytes);
}
} catch (NumberFormatException e) {
command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ERROR_COUNT));
return;
}
}
if (commandElems.size() > 5) {
try {
byte[] bytes = commandElems.get(4);
String tmp = Coder.bytesToString(bytes);
if (tmp.equalsIgnoreCase("COUNT")) {
bytes = commandElems.get(5);
count = Coder.bytesToInt(bytes);
}
} catch (NumberFormatException e) {
command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ERROR_COUNT));
return;
}
}
if (count < 0) {
command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ERROR_COUNT));
return;
}
try {
matchPattern = convertGlobToRegex(globMatchString);
} catch (PatternSyntaxException e) {
command.setResponse(
Coder.getErrorResponse(context.getByteBufAllocator(), RedisConstants.ERROR_ILLEGAL_GLOB));
return;
}
@SuppressWarnings("unchecked")
List<String> returnList = (List<String>) getIteration(context.getRegionProvider().metaKeySet(),
matchPattern, count, cursor);
command.setResponse(Coder.getScanResponse(context.getByteBufAllocator(), returnList));
}
@SuppressWarnings("unchecked")
@Override
protected List<?> getIteration(Collection<?> list, Pattern matchPattern, int count, int cursor) {
List<String> returnList = new ArrayList<String>();
int size = list.size();
int beforeCursor = 0;
int numElements = 0;
int i = -1;
for (String key : (Collection<String>) list) {
if (key.equals(GeodeRedisServer.REDIS_META_DATA_REGION)
|| key.equals(GeodeRedisServer.STRING_REGION) || key.equals(GeodeRedisServer.HLL_REGION))
continue;
i++;
if (beforeCursor < cursor) {
beforeCursor++;
continue;
} else if (numElements < count) {
if (matchPattern != null) {
if (matchPattern.matcher(key).matches()) {
returnList.add(key);
numElements++;
}
} else {
returnList.add(key);
numElements++;
}
} else
break;
}
if (i == size - (NUM_DEFAULT_REGIONS + 1))
returnList.add(0, String.valueOf(0));
else
returnList.add(0, String.valueOf(i));
return returnList;
}
}