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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.Insert;
import org.springframework.data.relational.core.sql.Into;
import org.springframework.data.relational.core.sql.Values;
import org.springframework.data.relational.core.sql.Visitable;
import org.springframework.util.Assert;
/**
* {@link PartRenderer} for {@link Insert} statements.
*
* @author Mark Paluch
* @author Jens Schauder
* @author Mikhail Polivakha
* @since 1.1
*/
class InsertStatementVisitor extends DelegatingVisitor implements PartRenderer {
private final StringBuilder builder = new StringBuilder();
private final StringBuilder into = new StringBuilder();
private final StringBuilder columns = new StringBuilder();
private final StringBuilder values = new StringBuilder();
private final IntoClauseVisitor intoClauseVisitor;
private final ColumnVisitor columnVisitor;
private final ValuesVisitor valuesVisitor;
private final RenderContext renderContext;
InsertStatementVisitor(RenderContext renderContext) {
Assert.notNull(renderContext, "renderContext must not be null");
this.renderContext = renderContext;
this.intoClauseVisitor = createIntoClauseVisitor(renderContext);
this.columnVisitor = createColumnVisitor(renderContext);
this.valuesVisitor = new ValuesVisitor(renderContext, values::append);
}
@Override
public Delegation doEnter(Visitable segment) {
if (segment instanceof Into) {
return Delegation.delegateTo(this.intoClauseVisitor);
}
if (segment instanceof Column) {
return Delegation.delegateTo(this.columnVisitor);
}
if (segment instanceof Values) {
return Delegation.delegateTo(this.valuesVisitor);
}
return Delegation.retain();
}
@Override
public Delegation doLeave(Visitable segment) {
if (segment instanceof Insert) {
builder.append("INSERT");
builder.append(" INTO ").append(into);
addInsertColumnsIfPresent();
addInsertValuesIfPresentElseDefault();
return Delegation.leave();
}
return Delegation.retain();
}
@Override
public CharSequence getRenderedPart() {
return builder;
}
private void addInsertValuesIfPresentElseDefault() {
if (values.length() != 0) {
builder.append(" VALUES (").append(values).append(")");
} else {
addInsertWithDefaultValuesToBuilder();
}
}
private void addInsertColumnsIfPresent() {
if (columns.length() != 0) {
builder.append(" (").append(columns).append(")");
}
}
private void addInsertWithDefaultValuesToBuilder() {
builder.append(renderContext.getInsertRenderContext().getDefaultValuesInsertPart());
}
private ColumnVisitor createColumnVisitor(RenderContext context) {
return new ColumnVisitor(context, false, it -> {
if (columns.length() != 0) {
columns.append(", ");
}
columns.append(it);
});
}
private IntoClauseVisitor createIntoClauseVisitor(RenderContext context) {
return new IntoClauseVisitor(context, it -> {
if (into.length() != 0) {
into.append(", ");
}
into.append(it);
});
}
}