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18 package org.apache.shardingsphere.sql.parser.sql.common.segment.dml.item;
19
20 import lombok.Getter;
21 import lombok.RequiredArgsConstructor;
22 import lombok.Setter;
23 import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.subquery.SubquerySegment;
24 import org.apache.shardingsphere.sql.parser.sql.common.segment.generic.AliasAvailable;
25 import org.apache.shardingsphere.sql.parser.sql.common.segment.generic.AliasSegment;
26 import org.apache.shardingsphere.sql.parser.sql.common.value.identifier.IdentifierValue;
27
28 import java.util.Optional;
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33 @RequiredArgsConstructor
34 @Getter
35 public final class SubqueryProjectionSegment implements ProjectionSegment, AliasAvailable {
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37 private final SubquerySegment subquery;
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39 private final String text;
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41 @Setter
42 private AliasSegment alias;
43
44 @Override
45 public String getColumnLabel() {
46 return getAliasName().orElse(text);
47 }
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49 @Override
50 public Optional<String> getAliasName() {
51 return null == alias ? Optional.empty() : Optional.ofNullable(alias.getIdentifier().getValue());
52 }
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54 @Override
55 public Optional<IdentifierValue> getAlias() {
56 return Optional.ofNullable(alias).map(AliasSegment::getIdentifier);
57 }
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64 public Optional<AliasSegment> getAliasSegment() {
65 return Optional.ofNullable(alias);
66 }
67
68 @Override
69 public int getStartIndex() {
70 return subquery.getStartIndex();
71 }
72
73 @Override
74 public int getStopIndex() {
75 return subquery.getStopIndex();
76 }
77 }