org.mybatis.dynamic.sql.select.render.PagingModelRenderer Maven / Gradle / Ivy
/**
* Copyright 2016-2019 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
*
* http://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.concurrent.atomic.AtomicInteger;
import org.mybatis.dynamic.sql.render.RenderingStrategy;
import org.mybatis.dynamic.sql.select.PagingModel;
import org.mybatis.dynamic.sql.util.FragmentAndParameters;
public class PagingModelRenderer {
private RenderingStrategy renderingStrategy;
private PagingModel pagingModel;
private AtomicInteger sequence;
private PagingModelRenderer(Builder builder) {
renderingStrategy = Objects.requireNonNull(builder.renderingStrategy);
pagingModel = Objects.requireNonNull(builder.pagingModel);
sequence = Objects.requireNonNull(builder.sequence);
}
public Optional render() {
return pagingModel.limit().map(this::limitAndOffsetRender)
.orElseGet(this::fetchFirstRender);
}
private Optional limitAndOffsetRender(Long limit) {
return new LimitAndOffsetPagingModelRenderer(renderingStrategy, limit,
pagingModel, sequence).render();
}
private Optional fetchFirstRender() {
return new FetchFirstPagingModelRenderer(renderingStrategy, pagingModel, sequence).render();
}
public static class Builder {
private RenderingStrategy renderingStrategy;
private PagingModel pagingModel;
private AtomicInteger sequence;
public Builder withRenderingStrategy(RenderingStrategy renderingStrategy) {
this.renderingStrategy = renderingStrategy;
return this;
}
public Builder withPagingModel(PagingModel pagingModel) {
this.pagingModel = pagingModel;
return this;
}
public Builder withSequence(AtomicInteger sequence) {
this.sequence = sequence;
return this;
}
public PagingModelRenderer build() {
return new PagingModelRenderer(this);
}
}
}