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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.render;
import org.springframework.data.relational.core.sql.In;
import org.springframework.data.relational.core.sql.Visitable;
/**
* Renderer for {@link In}. Uses a {@link RenderTarget} to call back for render results.
*
* @author Mark Paluch
* @author Jens Schauder
* @since 1.1
*/
class InVisitor extends TypedSingleConditionRenderSupport {
private final RenderTarget target;
private final StringBuilder part = new StringBuilder();
private boolean needsComma = false;
private boolean notIn = false;
InVisitor(RenderContext context, RenderTarget target) {
super(context);
this.target = target;
}
/*
* (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 (hasDelegatedRendering()) {
CharSequence renderedPart = consumeRenderedPart();
if (needsComma) {
part.append(", ");
}
if (part.length() == 0) {
part.append(renderedPart);
if (notIn) {
part.append(" NOT");
}
part.append(" IN (");
} else {
part.append(renderedPart);
needsComma = true;
}
}
return super.leaveNested(segment);
}
@Override
Delegation enterMatched(In segment) {
notIn = segment.isNotIn();
return super.enterMatched(segment);
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.sql.render.TypedSubtreeVisitor#leaveMatched(org.springframework.data.relational.core.sql.Visitable)
*/
@Override
Delegation leaveMatched(In segment) {
part.append(")");
target.onRendered(part);
return super.leaveMatched(segment);
}
}