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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.Condition;
import org.springframework.data.relational.core.sql.NestedCondition;
import org.springframework.data.relational.core.sql.Visitable;
import org.springframework.lang.Nullable;
/**
* Renderer for {@link NestedCondition}. Uses a {@link RenderTarget} to call back for render results.
*
* @author Mark Paluch
* @since 2.0
*/
class NestedConditionVisitor extends TypedSubtreeVisitor {
private final RenderContext context;
private final RenderTarget target;
private @Nullable ConditionVisitor conditionVisitor;
NestedConditionVisitor(RenderContext context, RenderTarget target) {
this.context = context;
this.target = target;
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.sql.render.TypedSubtreeVisitor#enterNested(org.springframework.data.relational.core.sql.Visitable)
*/
@Override
Delegation enterNested(Visitable segment) {
DelegatingVisitor visitor = getDelegation(segment);
return visitor != null ? Delegation.delegateTo(visitor) : Delegation.retain();
}
@Nullable
private DelegatingVisitor getDelegation(Visitable segment) {
if (segment instanceof Condition) {
return conditionVisitor = new ConditionVisitor(context);
}
return null;
}
/*
* (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 (conditionVisitor != null) {
target.onRendered("(" + conditionVisitor.getRenderedPart() + ")");
conditionVisitor = null;
}
return super.leaveNested(segment);
}
}