/
SetAssignmentsExtractor.java
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/
SetAssignmentsExtractor.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;
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.util.ExtractorUtils;
import org.apache.shardingsphere.core.parse.antlr.extractor.util.RuleName;
import org.apache.shardingsphere.core.parse.antlr.sql.segment.dml.assignment.AssignmentSegment;
import org.apache.shardingsphere.core.parse.antlr.sql.segment.dml.assignment.SetAssignmentsSegment;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
/**
* Set assignments extractor.
*
* @author zhangliang
*/
public final class SetAssignmentsExtractor implements OptionalSQLSegmentExtractor {
private AssignmentExtractor assignmentExtractor;
@Override
public Optional<SetAssignmentsSegment> extract(final ParserRuleContext ancestorNode) {
Optional<ParserRuleContext> setAssignmentsClauseNode = ExtractorUtils.findFirstChildNode(ancestorNode, RuleName.SET_ASSIGNMENTS_CLAUSE);
if (!setAssignmentsClauseNode.isPresent()) {
return Optional.absent();
}
Collection<AssignmentSegment> assignmentSegments = new LinkedList<>();
assignmentExtractor = new AssignmentExtractor(getPlaceholderIndexes(ancestorNode));
for (ParserRuleContext each : ExtractorUtils.getAllDescendantNodes(ancestorNode, RuleName.ASSIGNMENT)) {
Optional<AssignmentSegment> assignmentSegment = assignmentExtractor.extract(each);
if (assignmentSegment.isPresent()) {
assignmentSegments.add(assignmentSegment.get());
}
}
return Optional.of(new SetAssignmentsSegment(setAssignmentsClauseNode.get().getStart().getStartIndex(), assignmentSegments));
}
private Map<ParserRuleContext, Integer> getPlaceholderIndexes(final ParserRuleContext rootNode) {
Collection<ParserRuleContext> placeholderNodes = ExtractorUtils.getAllDescendantNodes(rootNode, RuleName.QUESTION);
Map<ParserRuleContext, Integer> result = new HashMap<>(placeholderNodes.size(), 1);
int index = 0;
for (ParserRuleContext each : placeholderNodes) {
result.put(each, index++);
}
return result;
}
}