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.nabla.algorithmic.forward.analysis; 018 019 import org.apache.commons.nabla.core.DifferentiationException; 020 021 /** Class used for delayed error reporting. 022 */ 023 public class ErrorReporter { 024 025 /** Error report. */ 026 private DifferentiationException reportedError; 027 028 /** Register an exception to be reported later. 029 * @param exception exception to be reported 030 */ 031 public void register(final DifferentiationException exception) { 032 reportedError = exception; 033 } 034 035 /** Check if an error has already been registered. 036 * @return true if an error has already been registered 037 */ 038 public boolean hasError() { 039 return reportedError != null; 040 } 041 042 /** Report the error if any. 043 * <p>If not error has been reported (i.e. if {@link #hasError()} returns 044 * <code>false</code>), this method does nothing. Otherwise, it rethrows 045 * the original exception.</p> 046 * @exception DifferentiationException if some error occurred 047 * during differentiation 048 */ 049 public void reportErrors() throws DifferentiationException { 050 if (reportedError != null) { 051 throw reportedError; 052 } 053 } 054 055 }