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Java example source code file (DefaultIterativeLinearSolverEvent.java)

This example Java source code file (DefaultIterativeLinearSolverEvent.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

defaultiterativelinearsolverevent, mathunsupportedoperationexception, object, override, realvector

The DefaultIterativeLinearSolverEvent.java Java example source code

/*
 * 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.math3.linear;

import org.apache.commons.math3.exception.MathUnsupportedOperationException;

/**
 * A default concrete implementation of the abstract class
 * {@link IterativeLinearSolverEvent}.
 *
 */
public class DefaultIterativeLinearSolverEvent extends IterativeLinearSolverEvent {

    /** */
    private static final long serialVersionUID = 20120129L;

    /** The right-hand side vector. */
    private final RealVector b;

    /** The current estimate of the residual. */
    private final RealVector r;

    /** The current estimate of the norm of the residual. */
    private final double rnorm;

    /** The current estimate of the solution. */
    private final RealVector x;

    /**
     * Creates a new instance of this class. This implementation does
     * <em>not deep copy the specified vectors {@code x}, {@code b},
     * {@code r}. Therefore the user must make sure that these vectors are
     * either unmodifiable views or deep copies of the same vectors actually
     * used by the {@code source}. Failure to do so may compromise subsequent
     * iterations of the {@code source}. If the residual vector {@code r} is
     * {@code null}, then {@link #getResidual()} throws a
     * {@link MathUnsupportedOperationException}, and
     * {@link #providesResidual()} returns {@code false}.
     *
     * @param source the iterative solver which fired this event
     * @param iterations the number of iterations performed at the time
     * {@code this} event is created
     * @param x the current estimate of the solution
     * @param b the right-hand side vector
     * @param r the current estimate of the residual (can be {@code null})
     * @param rnorm the norm of the current estimate of the residual
     */
    public DefaultIterativeLinearSolverEvent(final Object source, final int iterations,
        final RealVector x, final RealVector b, final RealVector r,
        final double rnorm) {
        super(source, iterations);
        this.x = x;
        this.b = b;
        this.r = r;
        this.rnorm = rnorm;
    }

    /**
     * Creates a new instance of this class. This implementation does
     * <em>not deep copy the specified vectors {@code x}, {@code b}.
     * Therefore the user must make sure that these vectors are either
     * unmodifiable views or deep copies of the same vectors actually used by
     * the {@code source}. Failure to do so may compromise subsequent iterations
     * of the {@code source}. Callling {@link #getResidual()} on instances
     * returned by this constructor throws a
     * {@link MathUnsupportedOperationException}, while
     * {@link #providesResidual()} returns {@code false}.
     *
     * @param source the iterative solver which fired this event
     * @param iterations the number of iterations performed at the time
     * {@code this} event is created
     * @param x the current estimate of the solution
     * @param b the right-hand side vector
     * @param rnorm the norm of the current estimate of the residual
     */
    public DefaultIterativeLinearSolverEvent(final Object source, final int iterations,
        final RealVector x, final RealVector b, final double rnorm) {
        super(source, iterations);
        this.x = x;
        this.b = b;
        this.r = null;
        this.rnorm = rnorm;
    }

    /** {@inheritDoc} */
    @Override
    public double getNormOfResidual() {
        return rnorm;
    }

    /**
     * {@inheritDoc}
     *
     * This implementation throws an {@link MathUnsupportedOperationException}
     * if no residual vector {@code r} was provided at construction time.
     */
    @Override
    public RealVector getResidual() {
        if (r != null) {
            return r;
        }
        throw new MathUnsupportedOperationException();
    }

    /** {@inheritDoc} */
    @Override
    public RealVector getRightHandSideVector() {
        return b;
    }

    /** {@inheritDoc} */
    @Override
    public RealVector getSolution() {
        return x;
    }

    /**
     * {@inheritDoc}
     *
     * This implementation returns {@code true} if a non-{@code null} value was
     * specified for the residual vector {@code r} at construction time.
     *
     * @return {@code true} if {@code r != null}
     */
    @Override
    public boolean providesResidual() {
        return r != null;
    }
}

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