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AssistQueryAndPlainInsertColumnsTokenGenerator.java
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AssistQueryAndPlainInsertColumnsTokenGenerator.java
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/*
* 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.encrypt.rewrite.token.generator.impl;
import com.google.common.base.Preconditions;
import org.apache.shardingsphere.encrypt.rewrite.token.generator.BaseEncryptSQLTokenGenerator;
import org.apache.shardingsphere.encrypt.rule.EncryptTable;
import org.apache.shardingsphere.infra.rewrite.sql.token.generator.CollectionSQLTokenGenerator;
import org.apache.shardingsphere.infra.rewrite.sql.token.pojo.generic.InsertColumnsToken;
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.common.segment.dml.column.ColumnSegment;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.Optional;
/**
* Assist query and plain insert columns token generator.
*/
public final class AssistQueryAndPlainInsertColumnsTokenGenerator extends BaseEncryptSQLTokenGenerator implements CollectionSQLTokenGenerator<InsertStatementContext> {
@Override
protected boolean isGenerateSQLTokenForEncrypt(final SQLStatementContext sqlStatementContext) {
if (sqlStatementContext instanceof InsertStatementContext) {
return (((InsertStatementContext) sqlStatementContext).getSqlStatement()).getInsertColumns().isPresent() && !(((InsertStatementContext) sqlStatementContext)).useDefaultColumns();
}
return false;
}
@Override
public Collection<InsertColumnsToken> generateSQLTokens(final InsertStatementContext insertStatementContext) {
Collection<InsertColumnsToken> result = new LinkedList<>();
Optional<EncryptTable> encryptTable = getEncryptRule().findEncryptTable(insertStatementContext.getSqlStatement().getTable().getTableName().getIdentifier().getValue());
Preconditions.checkState(encryptTable.isPresent());
for (ColumnSegment each : insertStatementContext.getSqlStatement().getColumns()) {
List<String> columns = getColumns(encryptTable.get(), each);
if (!columns.isEmpty()) {
result.add(new InsertColumnsToken(each.getStopIndex() + 1, columns));
}
}
return result;
}
private List<String> getColumns(final EncryptTable encryptTable, final ColumnSegment columnSegment) {
List<String> result = new LinkedList<>();
encryptTable.findAssistedQueryColumn(columnSegment.getIdentifier().getValue()).ifPresent(result::add);
encryptTable.findPlainColumn(columnSegment.getIdentifier().getValue()).ifPresent(result::add);
return result;
}
}