maedhroz commented on code in PR #3095: URL: https://github.com/apache/cassandra/pull/3095#discussion_r1588588292
########## src/java/org/apache/cassandra/cql3/restrictions/LikePattern.java: ########## @@ -0,0 +1,117 @@ +/* + * 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.cassandra.cql3.restrictions; + +import java.nio.ByteBuffer; + +import org.apache.cassandra.cql3.Operator; +import org.apache.cassandra.utils.ByteBufferUtil; + +import static org.apache.cassandra.cql3.statements.RequestValidations.invalidRequest; + +public final class LikePattern +{ + public enum Kind + { + PREFIX(Operator.LIKE_PREFIX), + SUFFIX(Operator.LIKE_SUFFIX), + CONTAINS(Operator.LIKE_CONTAINS), + MATCHES(Operator.LIKE_MATCHES); + + private final Operator operator; + + Kind(Operator operator) + { + this.operator = operator; + } + + public Operator operator() + { + return operator; + } + } + + private static final ByteBuffer WILDCARD = ByteBufferUtil.bytes("%"); + + private final Kind kind; + + private final ByteBuffer value; + + private LikePattern(Kind kind, ByteBuffer value) + { + this.kind = kind; + this.value = value; + } + + public Kind kind() + { + return kind; + } + + public ByteBuffer value() + { + return value; + } + + /** + * As the specific subtype of LIKE (LIKE_PREFIX, LIKE_SUFFIX, LIKE_CONTAINS, LIKE_MATCHES) can only be + * determined by examining the value, which in turn can only be known after binding, all LIKE restrictions + * are initially created with the generic LIKE operator. This function takes the bound value, trims the + * wildcard '%' chars from it and returns a tuple of the inferred operator subtype and the final value + * @param value the bound value for the LIKE operation + * @return Pair containing the inferred LIKE subtype and the value with wildcards removed + */ + public static LikePattern parse(ByteBuffer value) Review Comment: This is mostly the old `makeSpecific()` method? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
