| /* |
| * 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.ignite.internal.processors.rest.handlers.redis.string; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Collection; |
| import java.util.List; |
| import org.apache.ignite.IgniteCheckedException; |
| import org.apache.ignite.IgniteLogger; |
| import org.apache.ignite.internal.processors.rest.GridRestProtocolHandler; |
| import org.apache.ignite.internal.processors.rest.GridRestResponse; |
| import org.apache.ignite.internal.processors.rest.handlers.redis.GridRedisRestCommandHandler; |
| import org.apache.ignite.internal.processors.rest.handlers.redis.exception.GridRedisGenericException; |
| import org.apache.ignite.internal.processors.rest.protocols.tcp.redis.GridRedisCommand; |
| import org.apache.ignite.internal.processors.rest.protocols.tcp.redis.GridRedisMessage; |
| import org.apache.ignite.internal.processors.rest.protocols.tcp.redis.GridRedisProtocolParser; |
| import org.apache.ignite.internal.processors.rest.request.GridRestCacheRequest; |
| import org.apache.ignite.internal.processors.rest.request.GridRestRequest; |
| import org.apache.ignite.internal.util.typedef.internal.U; |
| |
| import static org.apache.ignite.internal.processors.rest.GridRestCommand.CACHE_GET; |
| import static org.apache.ignite.internal.processors.rest.protocols.tcp.redis.GridRedisCommand.GETRANGE; |
| |
| /** |
| * Redis SETRANGE command handler. |
| */ |
| public class GridRedisGetRangeCommandHandler extends GridRedisRestCommandHandler { |
| /** Supported commands. */ |
| private static final Collection<GridRedisCommand> SUPPORTED_COMMANDS = U.sealList( |
| GETRANGE |
| ); |
| |
| /** Start offset position in Redis message parameters. */ |
| private static final int START_OFFSET_POS = 1; |
| |
| /** End offset position in Redis message parameters. */ |
| private static final int END_OFFSET_POS = 2; |
| |
| /** {@inheritDoc} */ |
| public GridRedisGetRangeCommandHandler(final IgniteLogger log, final GridRestProtocolHandler hnd) { |
| super(log, hnd); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public Collection<GridRedisCommand> supportedCommands() { |
| return SUPPORTED_COMMANDS; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public GridRestRequest asRestRequest(GridRedisMessage msg) throws IgniteCheckedException { |
| assert msg != null; |
| |
| if (msg.messageSize() < 4) |
| throw new GridRedisGenericException("Wrong number of arguments"); |
| |
| GridRestCacheRequest getReq = new GridRestCacheRequest(); |
| |
| getReq.clientId(msg.clientId()); |
| getReq.key(msg.key()); |
| getReq.command(CACHE_GET); |
| |
| return getReq; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public ByteBuffer makeResponse(final GridRestResponse restRes, List<String> params) { |
| if (restRes.getResponse() == null) |
| return GridRedisProtocolParser.toBulkString(""); |
| else { |
| String res = String.valueOf(restRes.getResponse()); |
| int startOffset; |
| int endOffset; |
| |
| try { |
| startOffset = boundedStartOffset(Integer.parseInt(params.get(START_OFFSET_POS)), res.length()); |
| endOffset = boundedEndOffset(Integer.parseInt(params.get(END_OFFSET_POS)), res.length()); |
| } |
| catch (NumberFormatException e) { |
| U.error(log, "Erroneous offset", e); |
| return GridRedisProtocolParser.toGenericError("Offset is not an integer"); |
| } |
| |
| return GridRedisProtocolParser.toBulkString(res.substring(startOffset, endOffset)); |
| } |
| } |
| |
| /** |
| * @param idx Index. |
| * @param size Bounds. |
| * @return Offset within the bounds. |
| */ |
| private int boundedStartOffset(int idx, int size) { |
| return idx >= 0 ? Math.min(idx, size) : size + idx; |
| } |
| |
| /** |
| * @param idx Index. |
| * @param size Bounds. |
| * @return Offset within the bounds. |
| */ |
| private int boundedEndOffset(int idx, int size) { |
| return idx >= 0 ? Math.min(idx + 1, size) : size + idx + 1; |
| } |
| } |