1 /*
2 * Licensed to the Hipparchus project under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The Hipparchus project licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * https://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.hipparchus.analysis.integration.gauss;
18
19 import org.hipparchus.exception.MathIllegalArgumentException;
20 import org.hipparchus.util.Pair;
21
22 /** Interface for rules that determines the integration nodes and their weights.
23 * @since 2.0
24 */
25 public interface RuleFactory {
26
27 /**
28 * Gets a copy of the quadrature rule with the given number of integration
29 * points.
30 * The number of points is arbitrarily limited to 1000. It prevents resources
31 * exhaustion. In practice the number of points is often much lower.
32 *
33 * @param numberOfPoints Number of integration points.
34 * @return a copy of the integration rule.
35 * @throws MathIllegalArgumentException if {@code numberOfPoints < 1}.
36 * @throws MathIllegalArgumentException if {@code numberOfPoints > 1000}.
37 * @throws MathIllegalArgumentException if the elements of the rule pair do not
38 * have the same length.
39 */
40 Pair<double[], double[]> getRule(int numberOfPoints) throws MathIllegalArgumentException;
41
42 }