/*
 * 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.
 * 
 *  Copyright (c) 2009 by Vinnie Falco
 *  Copyright (c) 2016 by Bernd Porr
 */


package uk.me.berndporr.iirj;

import org.apache.commons.math3.complex.Complex;

/**
 * 
 * A complex pair
 *
 */
public class ComplexPair {

        public Complex first;
        public Complex second;

        ComplexPair (Complex c1,
                     Complex c2) {
            first = c1;
            second = c2;
        }

        ComplexPair (Complex c1) {
            first = c1;
            second = new Complex(0,0);
        }

        boolean isConjugate () {
            return second.equals(first.conjugate());
        }

        boolean isReal () {
            return first.getImaginary() == 0 && second.getImaginary() == 0;
        }

        // Returns true if this is either a conjugate pair,
        // or a pair of reals where neither is zero.
        boolean isMatchedPair () {
            if (first.getImaginary() != 0)
                return second.equals(first.conjugate());
            else
            return second.getImaginary() == 0 &&
                    second.getReal() != 0 &&
                    first.getReal() != 0;
        }

        boolean is_nan()
        {
            return first.isNaN() || second.isNaN();
        }
    };
