timoninmaxim commented on a change in pull request #9118: URL: https://github.com/apache/ignite/pull/9118#discussion_r684673395
########## File path: modules/core/src/main/java/org/apache/ignite/cache/query/IndexQuery.java ########## @@ -0,0 +1,133 @@ +/* + * 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.cache.query; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collections; +import java.util.HashSet; +import java.util.List; +import java.util.Set; +import javax.cache.Cache; +import org.apache.ignite.internal.util.typedef.internal.A; +import org.apache.ignite.lang.IgniteExperimental; +import org.jetbrains.annotations.Nullable; + +/** + * Index query runs over internal index structure and returns cache entries for index rows that match specified criteria. + */ +@IgniteExperimental +public final class IndexQuery<K, V> extends Query<Cache.Entry<K, V>> { + /** */ + private static final long serialVersionUID = 0L; + + /** Index query criteria. */ + private List<IndexQueryCriterion> criteria; + + /** Cache Value class. Describes a table within a cache that runs a query. */ + private final String valCls; + + /** Optional index name. */ + private final @Nullable String idxName; + + /** + * Specify index with cache value class. + * + * @param valCls Cache value class. + */ + public IndexQuery(Class<V> valCls) { + this(valCls, null); + } + + /** + * Specify index with cache value class and index name. If {@code idxName} is {@code null} then Ignite checks + * all indexes to find best match by {@link #valCls} and {@link #criteria} fields. + * + * @param valCls Cache value class. + * @param idxName Optional Index name. + */ + public IndexQuery(Class<V> valCls, @Nullable String idxName) { + A.notNull(valCls, "valCls"); + + if (idxName != null) + A.notNullOrEmpty(idxName, "idxName"); + + this.valCls = valCls.getName(); + this.idxName = idxName; + } + + /** + * Provide multiple index query criterion joint with AND. + */ + public IndexQuery<K, V> setCriteria(IndexQueryCriterion criterion, IndexQueryCriterion... criteria) { Review comment: This is done to force user to specify at least one criteria. `setCriteria()` without params is useless. -- 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]
