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Spring Data Relational support
/*
* Copyright 2019-2023 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.render;
import org.springframework.data.relational.core.sql.Column;
import org.springframework.data.relational.core.sql.SqlIdentifier;
import org.springframework.data.relational.core.sql.TableLike;
import org.springframework.data.relational.core.sql.Visitable;
import org.springframework.lang.Nullable;
/**
* Renderer for {@link Column}s. Renders a column as {@literal >table<.>column<} or
* {@literal >column<}.
*
* @author Mark Paluch
* @since 1.1
*/
class ColumnVisitor extends TypedSubtreeVisitor {
private final RenderContext context;
private final RenderTarget target;
private final boolean considerTablePrefix;
private @Nullable SqlIdentifier tableName;
ColumnVisitor(RenderContext context, boolean considerTablePrefix, RenderTarget target) {
this.context = context;
this.target = target;
this.considerTablePrefix = considerTablePrefix;
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.sql.render.TypedSubtreeVisitor#leaveMatched(org.springframework.data.relational.core.sql.Visitable)
*/
@Override
Delegation leaveMatched(Column segment) {
SqlIdentifier column = context.getNamingStrategy().getName(segment);
CharSequence name = considerTablePrefix && tableName != null
? NameRenderer.render(context, SqlIdentifier.from(tableName, column))
: NameRenderer.render(context, segment);
target.onRendered(name);
return super.leaveMatched(segment);
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.sql.render.TypedSubtreeVisitor#leaveNested(org.springframework.data.relational.core.sql.Visitable)
*/
@Override
Delegation leaveNested(Visitable segment) {
if (segment instanceof TableLike) {
tableName = context.getNamingStrategy().getReferenceName((TableLike) segment);
}
return super.leaveNested(segment);
}
}