| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.commons.numbers.rootfinder; |
| |
| import java.util.function.DoubleUnaryOperator; |
| |
| /** |
| * Wrapper class for counting functions calls. |
| */ |
| class MonitoredFunction implements DoubleUnaryOperator { |
| private final int maxCount; |
| private int callsCount; |
| private final DoubleUnaryOperator f; |
| |
| MonitoredFunction(DoubleUnaryOperator f) { |
| this(f, Integer.MAX_VALUE); |
| } |
| |
| MonitoredFunction(DoubleUnaryOperator f, |
| int maxCount) { |
| callsCount = 0; |
| this.f = f; |
| this.maxCount = maxCount; |
| } |
| |
| int getCallsCount() { |
| return callsCount; |
| } |
| |
| @Override |
| public double applyAsDouble(double x) { |
| if (++callsCount > maxCount) { |
| throw new IllegalStateException(callsCount + " > " + maxCount + |
| ": too many calls"); |
| } |
| return f.applyAsDouble(x); |
| } |
| } |