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/*
 * Copyright 2017-2023 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.domain;

/**
 * {@link Pageable} implementation to represent the absence of pagination information.
 *
 * @author Oliver Gierke
 */
enum Unpaged implements Pageable {

	INSTANCE;

	@Override
	public boolean isPaged() {
		return false;
	}

	@Override
	public Pageable previousOrFirst() {
		return this;
	}

	@Override
	public Pageable next() {
		return this;
	}

	@Override
	public boolean hasPrevious() {
		return false;
	}

	@Override
	public Sort getSort() {
		return Sort.unsorted();
	}

	@Override
	public int getPageSize() {
		throw new UnsupportedOperationException();
	}

	@Override
	public int getPageNumber() {
		throw new UnsupportedOperationException();
	}

	@Override
	public long getOffset() {
		throw new UnsupportedOperationException();
	}

	@Override
	public Pageable first() {
		return this;
	}

	@Override
	public Pageable withPage(int pageNumber) {

		if (pageNumber == 0) {
			return this;
		}

		throw new UnsupportedOperationException();
	}

}