spring-data-jpa PageableUtils 源码
spring-data-jpa PageableUtils 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/support/PageableUtils.java
/*
* Copyright 2008-2022 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.jpa.support;
import org.springframework.dao.InvalidDataAccessApiUsageException;
import org.springframework.data.domain.Pageable;
/**
* Provide a set of utility methods to support {@link Pageable}s.
*
* @author Greg Turnquist
* @since 3.0
*/
public final class PageableUtils {
private PageableUtils() {
throw new IllegalStateException("Cannot instantiate a utility class!");
}
/**
* Convert a {@link Pageable}'s offset value from {@link Long} to {@link Integer} to support JPA spec methods.
*
* @param pageable
* @return integer
*/
public static int getOffsetAsInteger(Pageable pageable) {
if (pageable.getOffset() > Integer.MAX_VALUE) {
throw new InvalidDataAccessApiUsageException("Page offset exceeds Integer.MAX_VALUE (" + Integer.MAX_VALUE + ")");
}
return Math.toIntExact(pageable.getOffset());
}
}
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