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    }