001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     * 
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     * 
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.commons.math.analysis;
018    
019    import org.apache.commons.math.FunctionEvaluationException;
020    
021    /**
022     * Wrapper class for counting functions calls.
023     *
024     * @version $Revision: 786927 $ $Date: 2009-06-20 19:37:47 -0400 (Sat, 20 Jun 2009) $ 
025     */
026    public class MonitoredFunction implements UnivariateRealFunction {
027    
028        public MonitoredFunction(UnivariateRealFunction f) {
029            callsCount = 0;
030            this.f = f;
031        }
032    
033        public void setCallsCount(int callsCount) {
034            this.callsCount = callsCount;
035        }
036    
037        public int getCallsCount() {
038            return callsCount;
039        }
040    
041        public double value(double x) throws FunctionEvaluationException {
042            ++callsCount;
043            return f.value(x);
044        }
045    
046        private int callsCount;
047        private UnivariateRealFunction f;
048    
049    }