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DefaultPagination.java
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DefaultPagination.java
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/*
*
* Copyright (c) 2019 Otávio Santana and others
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Apache License v2.0 which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Apache License v2.0 is available at http://www.opensource.org/licenses/apache2.0.php.
*
* You may elect to redistribute this code under either of these licenses.
*
* Contributors:
*
* Otavio Santana
*
*/
package org.jnosql.artemis;
import java.util.Objects;
/**
* The default implementation of {@link Pagination}
*/
final class DefaultPagination implements Pagination {
private final long page;
private final long size;
private final boolean readOnly;
DefaultPagination(long page, long size) {
this(page, size, false);
}
DefaultPagination(long page, long size, boolean readOnly) {
this.page = page;
this.size = size;
this.readOnly = readOnly;
}
@Override
public long getPageNumber() {
return page;
}
@Override
public long getPageSize() {
return size;
}
@Override
public long getLimit() {
return size;
}
@Override
public long getSkip() {
return size * (page - 1);
}
@Override
public Pagination next() {
if (readOnly) {
throw new UnsupportedOperationException("the next method is not authorized when the pagination is read-only.");
} else {
return new DefaultPagination(page + 1, size);
}
}
@Override
public Pagination unmodifiable() {
if (readOnly) {
return this;
}
return new DefaultPagination(page, size, true);
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
DefaultPagination that = (DefaultPagination) o;
return page == that.page &&
size == that.size;
}
@Override
public int hashCode() {
return Objects.hash(page, size);
}
@Override
public String toString() {
return "page " + page + " of " + size;
}
}