| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| package org.apache.tika.eval.app.io; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.charset.StandardCharsets; |
| import java.sql.SQLException; |
| import javax.xml.stream.XMLInputFactory; |
| import javax.xml.stream.XMLStreamConstants; |
| import javax.xml.stream.XMLStreamException; |
| import javax.xml.stream.XMLStreamReader; |
| |
| import org.apache.commons.io.IOUtils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.slf4j.event.Level; |
| |
| import org.apache.tika.utils.XMLReaderUtils; |
| |
| |
| public class XMLLogReader { |
| private static final Logger LOG = LoggerFactory.getLogger(XMLLogReader.class); |
| //class that wraps a logger's xml output |
| //into a single xml parseable input stream. |
| |
| public void read(InputStream xmlLogFileIs, XMLLogMsgHandler handler) throws XMLStreamException { |
| InputStream is = new LogXMLWrappingInputStream(xmlLogFileIs); |
| XMLInputFactory factory = XMLReaderUtils.getXMLInputFactory(); |
| XMLStreamReader reader = factory.createXMLStreamReader(is); |
| |
| Level level = null; |
| while (reader.hasNext()) { |
| reader.next(); |
| switch (reader.getEventType()) { |
| case XMLStreamConstants.START_ELEMENT: |
| if ("event".equals(reader.getLocalName())) { |
| String levelString = reader.getAttributeValue("", "level"); |
| if (levelString != null) { |
| level = Level.valueOf(levelString); |
| } else { |
| level = Level.DEBUG; |
| } |
| } else if ("message".equals(reader.getLocalName())) { |
| try { |
| handler.handleMsg(level, reader.getElementText()); |
| } catch (IOException e) { |
| LOG.warn("Error parsing: {}", reader.getElementText()); |
| } catch (SQLException e) { |
| LOG.warn("SQLException: {}", e.getMessage()); |
| } |
| } |
| break; |
| case XMLStreamConstants.END_ELEMENT: |
| if ("event".equals(reader.getLocalName())) { |
| level = null; |
| } else if ("message".equals(reader.getLocalName())) { |
| //do we care any more? |
| } |
| break; |
| } |
| ; |
| } |
| } |
| |
| |
| static class LogXMLWrappingInputStream extends InputStream { |
| //plagiarized from log4j's chainsaw |
| private final static String HEADER = |
| "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>" + "<log4j:eventSet version=\"1.2\" " + |
| "xmlns:log4j=\"http://jakarta.apache.org/log4j/\">"; |
| private static final String FOOTER = "</log4j:eventSet>"; |
| int currentStreamIndex = 0; |
| private InputStream[] streams; |
| |
| private LogXMLWrappingInputStream(InputStream xmlLogFileIs) { |
| streams = new InputStream[3]; |
| streams[0] = new ByteArrayInputStream(HEADER.getBytes(StandardCharsets.UTF_8)); |
| streams[1] = xmlLogFileIs; |
| streams[2] = new ByteArrayInputStream(FOOTER.getBytes(StandardCharsets.UTF_8)); |
| |
| } |
| |
| @Override |
| public int read() throws IOException { |
| int c = streams[currentStreamIndex].read(); |
| if (c < 0) { |
| IOUtils.closeQuietly(streams[currentStreamIndex]); |
| while (currentStreamIndex < streams.length - 1) { |
| currentStreamIndex++; |
| int tmpC = streams[currentStreamIndex].read(); |
| if (tmpC < 0) { |
| IOUtils.closeQuietly(streams[currentStreamIndex]); |
| } else { |
| return tmpC; |
| } |
| } |
| return -1; |
| } |
| return c; |
| } |
| } |
| } |