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