Add ShardingConditionEngine (#7690)

shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-route/src/main/java/org/apache/shardingsphere/sharding/route/engine/ShardingSQLRouter.java

@@ -26,8 +26,9 @@ import org.apache.shardingsphere.infra.sql.LogicSQL;
 import org.apache.shardingsphere.sharding.constant.ShardingOrder;
 import org.apache.shardingsphere.sharding.route.engine.condition.ShardingCondition;
 import org.apache.shardingsphere.sharding.route.engine.condition.ShardingConditions;
-import org.apache.shardingsphere.sharding.route.engine.condition.engine.InsertClauseShardingConditionEngine;
-import org.apache.shardingsphere.sharding.route.engine.condition.engine.WhereClauseShardingConditionEngine;
+import org.apache.shardingsphere.sharding.route.engine.condition.engine.ShardingConditionEngine;
+import org.apache.shardingsphere.sharding.route.engine.condition.engine.impl.InsertClauseShardingConditionEngine;
+import org.apache.shardingsphere.sharding.route.engine.condition.engine.impl.WhereClauseShardingConditionEngine;
 import org.apache.shardingsphere.sharding.route.engine.type.ShardingRouteEngineFactory;
 import org.apache.shardingsphere.sharding.route.engine.validator.ShardingStatementValidator;
 import org.apache.shardingsphere.sharding.route.engine.validator.ShardingStatementValidatorFactory;
@@ -61,8 +62,7 @@ public final class ShardingSQLRouter implements SQLRouter<ShardingRule> {
         SQLStatement sqlStatement = logicSQL.getSqlStatementContext().getSqlStatement();
         Optional<ShardingStatementValidator> validator = ShardingStatementValidatorFactory.newInstance(sqlStatement);
         validator.ifPresent(v -> v.preValidate(rule, logicSQL.getSqlStatementContext(), logicSQL.getParameters(), logicSQL.getSchema().getMetaData()));
-        ShardingConditions shardingConditions = getShardingConditions(
-                logicSQL.getParameters(), logicSQL.getSqlStatementContext(), logicSQL.getSchema().getMetaData().getRuleSchemaMetaData().getConfiguredSchemaMetaData(), rule);
+        ShardingConditions shardingConditions = getShardingConditions(logicSQL, rule);
         boolean needMergeShardingValues = isNeedMergeShardingValues(logicSQL.getSqlStatementContext(), rule);
         if (sqlStatement instanceof DMLStatement && needMergeShardingValues) {
             checkSubqueryShardingValues(logicSQL.getSqlStatementContext(), rule, shardingConditions);
@@ -73,15 +73,22 @@ public final class ShardingSQLRouter implements SQLRouter<ShardingRule> {
         return result;
     }
     
-    private ShardingConditions getShardingConditions(final List<Object> parameters, 
-                                                     final SQLStatementContext<?> sqlStatementContext, final SchemaMetaData schemaMetaData, final ShardingRule rule) {
-        if (sqlStatementContext.getSqlStatement() instanceof DMLStatement) {
-            if (sqlStatementContext instanceof InsertStatementContext) {
-                return new ShardingConditions(new InsertClauseShardingConditionEngine(rule, schemaMetaData).createShardingConditions((InsertStatementContext) sqlStatementContext, parameters));
-            }
-            return new ShardingConditions(new WhereClauseShardingConditionEngine(rule, schemaMetaData).createShardingConditions(sqlStatementContext, parameters));
+    @SuppressWarnings({"rawtypes", "unchecked"})
+    private ShardingConditions getShardingConditions(final LogicSQL logicSQL, final ShardingRule rule) {
+        List<ShardingCondition> shardingConditions;
+        if (logicSQL.getSqlStatementContext().getSqlStatement() instanceof DMLStatement) {
+            ShardingConditionEngine shardingConditionEngine = createShardingConditionEngine(logicSQL, rule);
+            shardingConditions = shardingConditionEngine.createShardingConditions(logicSQL.getSqlStatementContext(), logicSQL.getParameters());
+        } else {
+            shardingConditions = Collections.emptyList();
         }
-        return new ShardingConditions(Collections.emptyList());
+        return new ShardingConditions(shardingConditions);
+    }
+    
+    private ShardingConditionEngine<?> createShardingConditionEngine(final LogicSQL logicSQL, final ShardingRule rule) {
+        SchemaMetaData schemaMetaData = logicSQL.getSchema().getMetaData().getRuleSchemaMetaData().getConfiguredSchemaMetaData();
+        return logicSQL.getSqlStatementContext() instanceof InsertStatementContext 
+                ? new InsertClauseShardingConditionEngine(rule, schemaMetaData) : new WhereClauseShardingConditionEngine(rule, schemaMetaData);
     }
     
     private boolean isNeedMergeShardingValues(final SQLStatementContext<?> sqlStatementContext, final ShardingRule rule) {

shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-route/src/main/java/org/apache/shardingsphere/sharding/route/engine/condition/engine/ShardingConditionEngine.java

+/*
+ * 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.shardingsphere.sharding.route.engine.condition.engine;
+
+import org.apache.shardingsphere.sharding.route.engine.condition.ShardingCondition;
+import org.apache.shardingsphere.sql.parser.binder.statement.SQLStatementContext;
+
+import java.util.List;
+
+/**
+ * Sharding condition engine.
+ */
+public interface ShardingConditionEngine<T extends SQLStatementContext<?>> {
+    
+    /**
+     * Create sharding conditions.
+     *
+     * @param sqlStatementContext SQL statement context
+     * @param parameters SQL parameters
+     * @return sharding conditions
+     */
+    List<ShardingCondition> createShardingConditions(T sqlStatementContext, List<Object> parameters);
+}

shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-route/src/main/java/org/apache/shardingsphere/sharding/route/engine/condition/engine/InsertClauseShardingConditionEngine.java → shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-route/src/main/java/org/apache/shardingsphere/sharding/route/engine/condition/engine/impl/InsertClauseShardingConditionEngine.java

@@ -15,13 +15,14 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.sharding.route.engine.condition.engine;
+package org.apache.shardingsphere.sharding.route.engine.condition.engine.impl;
 
 import com.google.common.base.Preconditions;
 import lombok.RequiredArgsConstructor;
 import org.apache.shardingsphere.infra.exception.ShardingSphereException;
 import org.apache.shardingsphere.sharding.route.engine.condition.ExpressionConditionUtils;
 import org.apache.shardingsphere.sharding.route.engine.condition.ShardingCondition;
+import org.apache.shardingsphere.sharding.route.engine.condition.engine.ShardingConditionEngine;
 import org.apache.shardingsphere.sharding.route.spi.SPITimeService;
 import org.apache.shardingsphere.sharding.rule.ShardingRule;
 import org.apache.shardingsphere.sharding.strategy.value.ListRouteValue;
@@ -48,19 +49,13 @@ import java.util.stream.IntStream;
  * Sharding condition engine for insert clause.
  */
 @RequiredArgsConstructor
-public final class InsertClauseShardingConditionEngine {
+public final class InsertClauseShardingConditionEngine implements ShardingConditionEngine<InsertStatementContext> {
     
     private final ShardingRule shardingRule;
     
     private final SchemaMetaData schemaMetaData;
     
-    /**
-     * Create sharding conditions.
-     * 
-     * @param insertStatementContext insert statement context
-     * @param parameters SQL parameters
-     * @return sharding conditions
-     */
+    @Override
     public List<ShardingCondition> createShardingConditions(final InsertStatementContext insertStatementContext, final List<Object> parameters) {
         List<ShardingCondition> result = new LinkedList<>();
         String tableName = insertStatementContext.getSqlStatement().getTable().getTableName().getIdentifier().getValue();

shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-route/src/main/java/org/apache/shardingsphere/sharding/route/engine/condition/engine/WhereClauseShardingConditionEngine.java → shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-route/src/main/java/org/apache/shardingsphere/sharding/route/engine/condition/engine/impl/WhereClauseShardingConditionEngine.java

@@ -15,7 +15,7 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.sharding.route.engine.condition.engine;
+package org.apache.shardingsphere.sharding.route.engine.condition.engine.impl;
 
 import com.google.common.collect.Range;
 import lombok.RequiredArgsConstructor;
@@ -24,6 +24,7 @@ import org.apache.shardingsphere.sharding.route.engine.condition.AlwaysFalseRout
 import org.apache.shardingsphere.sharding.route.engine.condition.AlwaysFalseShardingCondition;
 import org.apache.shardingsphere.sharding.route.engine.condition.Column;
 import org.apache.shardingsphere.sharding.route.engine.condition.ShardingCondition;
+import org.apache.shardingsphere.sharding.route.engine.condition.engine.ShardingConditionEngine;
 import org.apache.shardingsphere.sharding.route.engine.condition.generator.ConditionValueGeneratorFactory;
 import org.apache.shardingsphere.sharding.rule.ShardingRule;
 import org.apache.shardingsphere.sharding.strategy.value.ListRouteValue;
@@ -56,19 +57,13 @@ import java.util.Optional;
  * Sharding condition engine for where clause.
  */
 @RequiredArgsConstructor
-public final class WhereClauseShardingConditionEngine {
+public final class WhereClauseShardingConditionEngine implements ShardingConditionEngine<SQLStatementContext<?>> {
     
     private final ShardingRule shardingRule;
     
     private final SchemaMetaData schemaMetaData;
     
-    /**
-     * Create sharding conditions.
-     * 
-     * @param sqlStatementContext SQL statement context
-     * @param parameters SQL parameters
-     * @return sharding conditions
-     */
+    @Override
     public List<ShardingCondition> createShardingConditions(final SQLStatementContext<?> sqlStatementContext, final List<Object> parameters) {
         if (!(sqlStatementContext instanceof WhereAvailable)) {
             return Collections.emptyList();