    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.logging.log4j.core.appender.db.jpa.converter;
    018
    019    import javax.persistence.AttributeConverter;
    020    import javax.persistence.Converter;
    021
    022    import org.apache.logging.log4j.util.Strings;
    023
    024    /**
    025     * A JPA 2.1 attribute converter for {@link StackTraceElement}s in {@link org.apache.logging.log4j.core.LogEvent}s. This
    026     * converter is capable of converting both to and from {@link String}s.
    027     */
    028    @Converter(autoApply = false)
    029    public class StackTraceElementAttributeConverter implements AttributeConverter<StackTraceElement, String> {
    030        private static final int UNKNOWN_SOURCE = -1;
    031
    032        private static final int NATIVE_METHOD = -2;
    033
    034        @Override
    035        public String convertToDatabaseColumn(final StackTraceElement element) {
    036            if (element == null) {
    037                return null;
    038            }
    039
    040            return element.toString();
    041        }
    042
    043        @Override
    044        public StackTraceElement convertToEntityAttribute(final String s) {
    045            if (Strings.isEmpty(s)) {
    046                return null;
    047            }
    048
    049            return StackTraceElementAttributeConverter.convertString(s);
    050        }
    051
    052        static StackTraceElement convertString(final String s) {
    053            final int open = s.indexOf("(");
    054
    055            final String classMethod = s.substring(0, open);
    056            final String className = classMethod.substring(0, classMethod.lastIndexOf("."));
    057            final String methodName = classMethod.substring(classMethod.lastIndexOf(".") + 1);
    058
    059            final String parenthesisContents = s.substring(open + 1, s.indexOf(")"));
    060
    061            String fileName = null;
    062            int lineNumber = UNKNOWN_SOURCE;
    063            if ("Native Method".equals(parenthesisContents)) {
    064                lineNumber = NATIVE_METHOD;
    065            } else if (!"Unknown Source".equals(parenthesisContents)) {
    066                final int colon = parenthesisContents.indexOf(":");
    067                if (colon > UNKNOWN_SOURCE) {
    068                    fileName = parenthesisContents.substring(0, colon);
    069                    try {
    070                        lineNumber = Integer.parseInt(parenthesisContents.substring(colon + 1));
    071                    } catch (final NumberFormatException ignore) {
    072                        // we don't care
    073                    }
    074                } else {
    075                    fileName = parenthesisContents.substring(0);
    076                }
    077            }
    078
    079            return new StackTraceElement(className, methodName, fileName, lineNumber);
    080        }
    081    }