[GitHub] [ignite] AMashenkov commented on a change in pull request #9118: IGNITE-14699 Add IndexQuery API.

[GitBox <gi...@apache.org>]

AMashenkov commented on a change in pull request #9118:
URL: https://github.com/apache/ignite/pull/9118#discussion_r640646154



##########
File path: modules/core/src/main/java/org/apache/ignite/cache/query/IndexQuery.java
##########
@@ -0,0 +1,263 @@
+/*
+ * 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 javax.cache.Cache;
+import org.apache.ignite.internal.cache.query.IndexCondition;
+import org.apache.ignite.internal.cache.query.RangeIndexCondition;
+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 condition.
+ */
+@IgniteExperimental
+public class IndexQuery<K, V> extends Query<Cache.Entry<K, V>> {
+    /** */
+    private static final long serialVersionUID = 0L;
+
+    /** Object to mark a boundary if {@code null} is specified. */
+    private static final Object NULL = new Null();
+
+    /** Index condition describes index query clause. */
+    private IndexCondition idxCond;
+
+    /** Cache Value class. Describes a table within a cache that runs a query. */
+    private final String valCls;
+
+    /** Optional index name. Find index by fields in condition. */
+    private final @Nullable String idxName;
+
+    /** Optional schema name. User has to specify schema to run query over an index created with SQL. */
+    private final @Nullable String schema;
+
+    /** */
+    private IndexQuery(String valCls, @Nullable String idxName, @Nullable String schema) {
+        this.valCls = valCls;
+        this.idxName = idxName;
+        this.schema = schema;
+    }
+
+    /**
+     * Specify index with cache value class. Ignite checks all indexes to find best match by
+     * {@link #valCls} and {@link IndexCondition#fields()}.
+     */
+    public static <K, V> IndexQuery<K, V> forType(Class<V> valCls) {
+        A.notNull(valCls, "valCls");
+
+        return new IndexQuery<>(valCls.getName(), null, null);
+    }
+
+    /**
+     * Specify index with cache value class and index name.
+     */
+    public static <K, V> IndexQuery<K, V> forIndex(Class<V> valCls, String idxName) {
+        A.notNull(valCls, "valCls");
+
+        return new IndexQuery<>(valCls.getName(), idxName, null);
+    }
+
+    /**
+     * Specify index with cache value class, index name and schema name.
+     * Note that schema is required parameter for indexes created with the "CREATE INDEX" SQL-clause.
+     */
+    public static <K, V> IndexQuery<K, V> forIndex(Class<V> valCls, String idxName, String schema) {
+        A.notNull(valCls, "valCls");
+
+        return new IndexQuery<>(valCls.getName(), idxName, schema);
+    }
+
+    /** Less Then. */
+    public IndexQuery<K, V> lt(String field, Object val) {

Review comment:
       Would you mind introducing a ConditionBuilder as a separate class?




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