/* * Copyright 2011-2013, by Vladimir Kostyukov and Contributors. * * This file is part of la4j project (http://la4j.org) * * Licensed 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. * * Contributor(s): - * */ package org.la4j.linear; import org.la4j.Matrix; import org.la4j.Vector; public abstract class AbstractSolver implements LinearSystemSolver { // TODO: rename a to matrix protected Matrix a; protected int unknowns; protected int equations; protected AbstractSolver(Matrix a) { if (!applicableTo(a)) { fail("Given coefficient matrix can not be used with this solver."); } this.a = a; this.unknowns = a.columns(); this.equations = a.rows(); } @Override public Matrix self() { return a; } @Override public int unknowns() { return unknowns; } @Override public int equations() { return equations; } protected void ensureRHSIsCorrect(Vector vector) { if (vector.length() != equations) { fail("Wrong length of RHS vector: " + vector.length() + "."); } } protected void fail(String message) { throw new IllegalArgumentException(message); } }