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/*
* Copyright (c) 2022,2023 Contributors to the Eclipse Foundation
*
* 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.
*
* SPDX-License-Identifier: Apache-2.0
*/
package jakarta.data.page;
import java.util.Arrays;
import java.util.List;
/**
* Built-in implementation of Cursor for cursor-based pagination.
*/
class PageRequestCursor implements PageRequest.Cursor {
/**
* Key values.
*/
private final Object[] key;
/**
* Constructs a cursor with the specified key values.
*
* @param key key values.
* @throws IllegalArgumentException if no key values are provided.
*/
PageRequestCursor(Object... key) {
this.key = key;
if (key == null || key.length == 0)
throw new IllegalArgumentException("No values were provided.");
}
@Override
public boolean equals(Object o) {
return this == o || o != null
&& o.getClass() == getClass()
&& Arrays.equals(key, ((PageRequestCursor) o).key);
}
public Object get(int index) {
return key[index];
}
@Override
public int hashCode() {
return Arrays.hashCode(key);
}
public int size() {
return key.length;
}
@Override
public List elements() {
return List.of(key);
}
@Override
public String toString() {
return "Cursor@" + Integer.toHexString(hashCode()) +
" with " + key.length + " values";
}
}