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- /*
- * Copyright 2000-2016 Vaadin Ltd.
- *
- * 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.
- */
- package com.vaadin.data.provider;
-
- import java.util.Comparator;
- import java.util.List;
- import java.util.Optional;
-
- /**
- * Immutable hierarchical query object used to request data from a backend.
- * Contains the parent node, index limits, sorting and filtering information.
- *
- * @param <T>
- * bean type
- * @param <F>
- * filter type
- *
- * @since 8.0
- */
- public class HierarchicalQuery<T, F> extends Query<T, F> {
-
- private final T parent;
-
- /**
- * Constructs a new hierarchical query object with given filter and parent
- * node.
- *
- * @param filter
- * filtering for fetching; can be <code>null</code>
- * @param parent
- * the hierarchical parent object, can be <code>null</code>
- */
- public HierarchicalQuery(F filter, T parent) {
- super(filter);
- this.parent = parent;
- }
-
- /**
- * Constructs a new hierarchical query object with given offset, limit,
- * sorting and filtering.
- *
- * @param offset
- * first index to fetch
- * @param limit
- * fetched item count
- * @param sortOrders
- * sorting order for fetching; used for sorting backends
- * @param inMemorySorting
- * comparator for sorting in-memory data
- * @param filter
- * filtering for fetching; can be <code>null</code>
- * @param parent
- * the hierarchical parent object, can be <code>null</code>
- */
- public HierarchicalQuery(int offset, int limit,
- List<QuerySortOrder> sortOrders, Comparator<T> inMemorySorting,
- F filter, T parent) {
- super(offset, limit, sortOrders, inMemorySorting, filter);
- this.parent = parent;
- }
-
- /**
- * Get the hierarchical parent object, can be <code>null</code>.
- *
- * @return the hierarchical parent object, can be <code>null</code>
- */
- public T getParent() {
- return parent;
- }
-
- /**
- * Get an Optional of the hierarchical parent object.
- *
- * @see #getParent()
- * @return the result of {@link #getParent()} wrapped by an Optional
- */
- public Optional<T> getParentOptional() {
- return Optional.ofNullable(parent);
- }
- }
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