Method: computeNeededResults()

1: /*
2: * *************************************************************************************************************************************************************
3: *
4: * TheseFoolishThings: Miscellaneous utilities
5: * http://tidalwave.it/projects/thesefoolishthings
6: *
7: * Copyright (C) 2009 - 2024 by Tidalwave s.a.s. (http://tidalwave.it)
8: *
9: * *************************************************************************************************************************************************************
10: *
11: * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
12: * You may obtain a copy of the License at
13: *
14: * http://www.apache.org/licenses/LICENSE-2.0
15: *
16: * 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
17: * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
18: *
19: * *************************************************************************************************************************************************************
20: *
21: * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
22: * git clone https://github.com/tidalwave-it/thesefoolishthings-src
23: *
24: * *************************************************************************************************************************************************************
25: */
26: package it.tidalwave.util.impl.finder;
27:
28: import javax.annotation.Nonnull;
29: import javax.annotation.concurrent.Immutable;
30: import java.util.Collection;
31: import java.util.List;
32: import java.util.concurrent.CopyOnWriteArrayList;
33: import java.util.function.BiFunction;
34: import java.util.function.Supplier;
35: import it.tidalwave.util.Finder;
36: import it.tidalwave.util.spi.SimpleFinderSupport;
37:
38: /***************************************************************************************************************************************************************
39: *
40: * A {@link Finder} which retrieve results from a {@link Supplier}.
41: *
42: * @author Fabrizio Giudici
43: *
44: **************************************************************************************************************************************************************/
45: @Immutable
46: public class ProviderFinder<T> extends SimpleFinderSupport<T>
47: {
48: private static final long serialVersionUID = 1344191036948400804L;
49:
50: @Nonnull
51: private final BiFunction<Integer, Integer, ? extends Collection<? extends T>> supplier;
52:
53: @SuppressWarnings("BoundedWildcard")
54: public ProviderFinder (@Nonnull final BiFunction<Integer, Integer, ? extends Collection<? extends T>> supplier)
55: {
56: this.supplier = supplier;
57: }
58:
59: public ProviderFinder (@Nonnull final ProviderFinder<T> other, @Nonnull final Object override)
60: {
61: super(other, override);
62: final ProviderFinder<T> source = getSource(ProviderFinder.class, other, override);
63: this.supplier = source.supplier;
64: }
65:
66: @Override @Nonnull
67: protected List<T> computeNeededResults()
68: {
69: return new CopyOnWriteArrayList<>(supplier.apply(firstResult, maxResults));
70: }
71: }