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/*
* SonarQube
* Copyright (C) 2009-2023 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.db;
import javax.annotation.concurrent.Immutable;
import static com.google.common.base.Preconditions.checkArgument;
@Immutable
public final class Pagination {
private static final Pagination ALL = new Builder(1).andSize(Integer.MAX_VALUE);
private final int page;
private final int pageSize;
private Pagination(Builder builder) {
this.page = builder.page;
this.pageSize = builder.pageSize;
}
public static Pagination all() {
return ALL;
}
public static Builder forPage(int page) {
return new Builder(page);
}
public int getPage() {
return page;
}
public int getPageSize() {
return pageSize;
}
public int getOffset() {
return (page - 1) * pageSize;
}
public int getStartRowNumber() {
return getOffset() + 1;
}
public int getEndRowNumber() {
return page * pageSize;
}
public static final class Builder {
private final int page;
private int pageSize = 0;
public Builder(int page) {
checkArgument(page >= 1, "page index must be >= 1");
this.page = page;
}
public Pagination andSize(int pageSize) {
checkArgument(pageSize >= 1, "page size must be >= 1");
this.pageSize = pageSize;
return new Pagination(this);
}
}
}
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