org.apache.shardingsphere.sharding.rewrite.token.generator.impl.ShardingInsertValuesTokenGenerator Maven / Gradle / Ivy
/*
* 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.rewrite.token.generator.impl;
import lombok.Setter;
import org.apache.shardingsphere.underlying.rewrite.sql.token.generator.aware.RouteContextAware;
import org.apache.shardingsphere.sharding.rewrite.token.pojo.ShardingInsertValue;
import org.apache.shardingsphere.sharding.rewrite.token.pojo.ShardingInsertValuesToken;
import org.apache.shardingsphere.sql.parser.binder.segment.insert.values.InsertValueContext;
import org.apache.shardingsphere.sql.parser.binder.statement.SQLStatementContext;
import org.apache.shardingsphere.sql.parser.binder.statement.dml.InsertStatementContext;
import org.apache.shardingsphere.sql.parser.sql.segment.dml.assignment.InsertValuesSegment;
import org.apache.shardingsphere.sql.parser.sql.segment.dml.expr.ExpressionSegment;
import org.apache.shardingsphere.underlying.common.rule.DataNode;
import org.apache.shardingsphere.underlying.rewrite.sql.token.generator.OptionalSQLTokenGenerator;
import org.apache.shardingsphere.underlying.rewrite.sql.token.pojo.generic.InsertValuesToken;
import org.apache.shardingsphere.underlying.route.context.RouteContext;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
/**
* Insert values token generator for sharding.
*/
@Setter
public final class ShardingInsertValuesTokenGenerator implements OptionalSQLTokenGenerator, RouteContextAware {
private RouteContext routeContext;
@Override
public boolean isGenerateSQLToken(final SQLStatementContext sqlStatementContext) {
return sqlStatementContext instanceof InsertStatementContext && !(((InsertStatementContext) sqlStatementContext).getSqlStatement()).getValues().isEmpty();
}
@Override
public InsertValuesToken generateSQLToken(final InsertStatementContext insertStatementContext) {
Collection insertValuesSegments = (insertStatementContext.getSqlStatement()).getValues();
InsertValuesToken result = new ShardingInsertValuesToken(getStartIndex(insertValuesSegments), getStopIndex(insertValuesSegments));
Iterator> originalDataNodesIterator = null == routeContext || routeContext.getRouteResult().getOriginalDataNodes().isEmpty()
? null : routeContext.getRouteResult().getOriginalDataNodes().iterator();
for (InsertValueContext each : insertStatementContext.getInsertValueContexts()) {
List expressionSegments = each.getValueExpressions();
Collection dataNodes = null == originalDataNodesIterator ? Collections.emptyList() : originalDataNodesIterator.next();
result.getInsertValues().add(new ShardingInsertValue(expressionSegments, dataNodes));
}
return result;
}
private int getStartIndex(final Collection segments) {
int result = segments.iterator().next().getStartIndex();
for (InsertValuesSegment each : segments) {
result = result > each.getStartIndex() ? each.getStartIndex() : result;
}
return result;
}
private int getStopIndex(final Collection segments) {
int result = segments.iterator().next().getStopIndex();
for (InsertValuesSegment each : segments) {
result = result < each.getStopIndex() ? each.getStopIndex() : result;
}
return result;
}
}