PointValuePair.java
- /*
- * 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.math4.legacy.optim;
- import java.util.Arrays;
- import org.apache.commons.math4.legacy.core.Pair;
- /**
- * This class holds a point and the value of an objective function at
- * that point.
- *
- * @see PointVectorValuePair
- * @see org.apache.commons.math4.legacy.analysis.MultivariateFunction
- * @since 3.0
- */
- public final class PointValuePair extends Pair<double[], Double> {
- /**
- * Builds a point/objective function value pair.
- *
- * @param point Point coordinates. This instance will store
- * a copy of the array, not the array passed as argument.
- * @param value Value of the objective function at the point.
- */
- public PointValuePair(final double[] point,
- final double value) {
- this(point, value, true);
- }
- /**
- * Builds a point/objective function value pair.
- *
- * @param point Point coordinates.
- * @param value Value of the objective function at the point.
- * @param copyArray if {@code true}, the input array will be copied,
- * otherwise it will be referenced.
- */
- public PointValuePair(final double[] point,
- final double value,
- final boolean copyArray) {
- super(copyArray ? ((point == null) ? null :
- point.clone()) :
- point,
- value);
- }
- /**
- * Gets the point.
- *
- * @return a copy of the stored point.
- */
- public double[] getPoint() {
- final double[] p = getKey();
- return p == null ? null : p.clone();
- }
- /**
- * Gets a reference to the point.
- *
- * @return a reference to the internal array storing the point.
- */
- public double[] getPointRef() {
- return getKey();
- }
- @Override
- public boolean equals(Object o) {
- if (o instanceof PointValuePair) {
- final PointValuePair other = (PointValuePair) o;
- return getValue().equals(other.getValue()) &&
- Arrays.equals(getPointRef(),
- other.getPointRef());
- }
- return false;
- }
- @Override
- public int hashCode() {
- return Arrays.hashCode(getKey()) + 31 * Double.hashCode(getValue());
- }
- @Override
- public String toString() {
- return "[" + Arrays.toString(getPointRef()) + ", " + getValue() + "]";
- }
- }