1 /*
2 * Licensed to the Apache Software Foundation (ASF) 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 ASF 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 * http://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.apache.commons.numbers.rootfinder;
18
19 import java.util.function.DoubleUnaryOperator;
20
21 /**
22 * Wrapper class for counting functions calls.
23 */
24 class MonitoredFunction implements DoubleUnaryOperator {
25 private final int maxCount;
26 private int callsCount;
27 private final DoubleUnaryOperator f;
28
29 MonitoredFunction(DoubleUnaryOperator f) {
30 this(f, Integer.MAX_VALUE);
31 }
32
33 MonitoredFunction(DoubleUnaryOperator f,
34 int maxCount) {
35 callsCount = 0;
36 this.f = f;
37 this.maxCount = maxCount;
38 }
39
40 int getCallsCount() {
41 return callsCount;
42 }
43
44 @Override
45 public double applyAsDouble(double x) {
46 if (++callsCount > maxCount) {
47 throw new IllegalStateException(callsCount + " > " + maxCount +
48 ": too many calls");
49 }
50 return f.applyAsDouble(x);
51 }
52 }