MultiSelectRenderer.java
/*
* Copyright 2016-2024 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.mybatis.dynamic.sql.select.render;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Collectors;
import org.mybatis.dynamic.sql.common.OrderByModel;
import org.mybatis.dynamic.sql.common.OrderByRenderer;
import org.mybatis.dynamic.sql.configuration.StatementConfiguration;
import org.mybatis.dynamic.sql.render.RenderingContext;
import org.mybatis.dynamic.sql.render.RenderingStrategy;
import org.mybatis.dynamic.sql.select.MultiSelectModel;
import org.mybatis.dynamic.sql.select.PagingModel;
import org.mybatis.dynamic.sql.select.SelectModel;
import org.mybatis.dynamic.sql.select.UnionQuery;
import org.mybatis.dynamic.sql.util.FragmentAndParameters;
import org.mybatis.dynamic.sql.util.FragmentCollector;
public class MultiSelectRenderer {
private final MultiSelectModel multiSelectModel;
private final RenderingContext renderingContext;
private MultiSelectRenderer(Builder builder) {
renderingContext = RenderingContext
.withRenderingStrategy(builder.renderingStrategy)
.withStatementConfiguration(builder.statementConfiguration)
.build();
multiSelectModel = Objects.requireNonNull(builder.multiSelectModel);
}
public SelectStatementProvider render() {
FragmentAndParameters initialSelect = renderSelect(multiSelectModel.initialSelect());
FragmentCollector fragmentCollector = multiSelectModel
.unionQueries()
.map(this::renderSelect)
.collect(FragmentCollector.collect(initialSelect));
renderOrderBy().ifPresent(fragmentCollector::add);
renderPagingModel().ifPresent(fragmentCollector::add);
return toSelectStatementProvider(fragmentCollector);
}
private SelectStatementProvider toSelectStatementProvider(FragmentCollector fragmentCollector) {
return DefaultSelectStatementProvider
.withSelectStatement(fragmentCollector.collectFragments(Collectors.joining(" "))) //$NON-NLS-1$
.withParameters(fragmentCollector.parameters())
.build();
}
private FragmentAndParameters renderSelect(SelectModel selectModel) {
SelectStatementProvider selectStatement = selectModel.render(renderingContext);
return FragmentAndParameters
.withFragment("(" + selectStatement.getSelectStatement() + ")") //$NON-NLS-1$ //$NON-NLS-2$
.withParameters(selectStatement.getParameters())
.build();
}
private FragmentAndParameters renderSelect(UnionQuery unionQuery) {
SelectStatementProvider selectStatement = unionQuery.selectModel().render(renderingContext);
return FragmentAndParameters.withFragment(
unionQuery.connector() + " (" + selectStatement.getSelectStatement() + ")") //$NON-NLS-1$ //$NON-NLS-2$
.withParameters(selectStatement.getParameters())
.build();
}
private Optional<FragmentAndParameters> renderOrderBy() {
return multiSelectModel.orderByModel().map(this::renderOrderBy);
}
private FragmentAndParameters renderOrderBy(OrderByModel orderByModel) {
return new OrderByRenderer().render(orderByModel);
}
private Optional<FragmentAndParameters> renderPagingModel() {
return multiSelectModel.pagingModel().map(this::renderPagingModel);
}
private FragmentAndParameters renderPagingModel(PagingModel pagingModel) {
return new PagingModelRenderer.Builder()
.withPagingModel(pagingModel)
.withRenderingContext(renderingContext)
.build()
.render();
}
public static class Builder {
private RenderingStrategy renderingStrategy;
private MultiSelectModel multiSelectModel;
private StatementConfiguration statementConfiguration;
public Builder withRenderingStrategy(RenderingStrategy renderingStrategy) {
this.renderingStrategy = renderingStrategy;
return this;
}
public Builder withMultiSelectModel(MultiSelectModel multiSelectModel) {
this.multiSelectModel = multiSelectModel;
return this;
}
public Builder withStatementConfiguration(StatementConfiguration statementConfiguration) {
this.statementConfiguration = statementConfiguration;
return this;
}
public MultiSelectRenderer build() {
return new MultiSelectRenderer(this);
}
}
}