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OnDuplicateKeyColumnsExtractor.java
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OnDuplicateKeyColumnsExtractor.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.core.parse.antlr.extractor.impl.dml.insert;
import com.google.common.base.Optional;
import org.antlr.v4.runtime.ParserRuleContext;
import org.apache.shardingsphere.core.parse.antlr.extractor.api.OptionalSQLSegmentExtractor;
import org.apache.shardingsphere.core.parse.antlr.extractor.impl.common.column.ColumnExtractor;
import org.apache.shardingsphere.core.parse.antlr.extractor.util.ExtractorUtils;
import org.apache.shardingsphere.core.parse.antlr.extractor.util.RuleName;
import org.apache.shardingsphere.core.parse.antlr.sql.segment.dml.column.ColumnSegment;
import org.apache.shardingsphere.core.parse.antlr.sql.segment.dml.column.OnDuplicateKeyColumnsSegment;
import java.util.Collection;
import java.util.LinkedList;
/**
* On duplicate key columns extractor.
*
* @author zhangliang
*/
public final class OnDuplicateKeyColumnsExtractor implements OptionalSQLSegmentExtractor {
private final ColumnExtractor columnExtractor = new ColumnExtractor();
@Override
public Optional<OnDuplicateKeyColumnsSegment> extract(final ParserRuleContext ancestorNode) {
Optional<ParserRuleContext> onDuplicateKeyClauseNode = ExtractorUtils.findFirstChildNode(ancestorNode, RuleName.ON_DUPLICATE_KEY_CLAUSE);
if (!onDuplicateKeyClauseNode.isPresent()) {
return Optional.absent();
}
return Optional.of(new OnDuplicateKeyColumnsSegment(extractColumnSegments(onDuplicateKeyClauseNode.get())));
}
private Collection<ColumnSegment> extractColumnSegments(final ParserRuleContext onDuplicateKeyClauseNode) {
Collection<ColumnSegment> result = new LinkedList<>();
for (ParserRuleContext each : ExtractorUtils.getAllDescendantNodes(onDuplicateKeyClauseNode, RuleName.COLUMN_NAME)) {
Optional<ColumnSegment> columnSegment = columnExtractor.extract(each);
if (columnSegment.isPresent()) {
result.add(columnSegment.get());
}
}
return result;
}
}