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Spring Data Relational support
/*
* Copyright 2019-2022 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.data.relational.core.sql;
/**
* {@link Segment} for a {@code JOIN} declaration.
*
* Renders to: {@code JOIN
*
* ON }.
*
* @author Mark Paluch
* @since 1.1
*/
public class Join extends AbstractSegment {
private final JoinType type;
private final TableLike joinTable;
private final Condition on;
Join(JoinType type, TableLike joinTable, Condition on) {
super(joinTable, on);
this.joinTable = joinTable;
this.type = type;
this.on = on;
}
/**
* @return join type.
*/
public JoinType getType() {
return type;
}
/**
* @return the joined {@link Table}.
*/
public TableLike getJoinTable() {
return joinTable;
}
/**
* @return join condition (the ON or USING part).
*/
public Condition getOn() {
return on;
}
/*
* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return type + " " + joinTable + " ON " + on;
}
public enum JoinType {
/**
* {@code INNER JOIN} for two tables.
*/
JOIN("JOIN"),
/**
* {@code CROSS JOIN} for two tables.
*/
CROSS_JOIN("CROSS JOIN"),
/**
* {@code LEFT OUTER JOIN} two tables.
*/
LEFT_OUTER_JOIN("LEFT OUTER JOIN"),
/**
* {@code RIGHT OUTER JOIN} two tables.
*/
RIGHT_OUTER_JOIN("RIGHT OUTER JOIN"),
/**
* {@code FULL OUTER JOIN} two tables.
*/
FULL_OUTER_JOIN("FULL OUTER JOIN");
private final String sql;
JoinType(String sql) {
this.sql = sql;
}
public String getSql() {
return sql;
}
}
}
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