StackTraceElementReader.java

/*
 * Lilith - a log event viewer.
 * Copyright (C) 2007-2017 Joern Huxhorn
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * Copyright 2007-2017 Joern Huxhorn
 *
 * Licensed 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 de.huxhorn.lilith.data.logging.xml;

import de.huxhorn.lilith.data.logging.ExtendedStackTraceElement;
import de.huxhorn.sulky.stax.GenericStreamReader;
import de.huxhorn.sulky.stax.StaxUtilities;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;

public class StackTraceElementReader
	implements GenericStreamReader<ExtendedStackTraceElement>, LoggingEventSchemaConstants
{
	public ExtendedStackTraceElement read(XMLStreamReader reader)
		throws XMLStreamException
	{
		String rootNamespace = NAMESPACE_URI;
		int type = reader.getEventType();

		if(XMLStreamConstants.START_DOCUMENT == type)
		{
			reader.nextTag();
			type = reader.getEventType();
			rootNamespace = null;
		}

		if(XMLStreamConstants.START_ELEMENT == type
			&& STACK_TRACE_ELEMENT_NODE.equals(reader.getLocalName()))
		{
			String classLoaderName = StaxUtilities.readAttributeValue(reader, NAMESPACE_URI, ST_CLASS_LOADER_NAME_ATTRIBUTE);
			String moduleName = StaxUtilities.readAttributeValue(reader, NAMESPACE_URI, ST_MODULE_NAME_ATTRIBUTE);
			String moduleVersion = StaxUtilities.readAttributeValue(reader, NAMESPACE_URI, ST_MODULE_VERSION_ATTRIBUTE);
			String className = StaxUtilities.readAttributeValue(reader, NAMESPACE_URI, ST_CLASS_NAME_ATTRIBUTE);
			String methodName = StaxUtilities.readAttributeValue(reader, NAMESPACE_URI, ST_METHOD_NAME_ATTRIBUTE);
			String fileName = StaxUtilities.readAttributeValue(reader, NAMESPACE_URI, ST_FILE_NAME_ATTRIBUTE);
			reader.nextTag();
			int lineNumber = -1;
			String str = StaxUtilities.readSimpleTextNodeIfAvailable(reader, null, ST_LINE_NUMBER_NODE);
			if(str != null)
			{
				lineNumber = Integer.valueOf(str);
			}
			type = reader.getEventType();
			if(XMLStreamConstants.START_ELEMENT == type && ST_NATIVE_NODE.equals(reader.getLocalName()))
			{
				lineNumber = ExtendedStackTraceElement.NATIVE_METHOD_LINE_NUMBER;
				reader.nextTag(); // close native
				reader.nextTag();
			}
			String codeLocation = StaxUtilities.readSimpleTextNodeIfAvailable(reader, null, ST_CODE_LOCATION_NODE);
			String version = StaxUtilities.readSimpleTextNodeIfAvailable(reader, null, ST_VERSION_NODE);
			type = reader.getEventType();
			boolean exact = false;
			if(XMLStreamConstants.START_ELEMENT == type && ST_EXACT_NODE.equals(reader.getLocalName()))
			{
				exact = true;
				reader.nextTag(); // close exact
				reader.nextTag();
			}

			reader.require(XMLStreamConstants.END_ELEMENT, null, STACK_TRACE_ELEMENT_NODE);
			ExtendedStackTraceElement result=new ExtendedStackTraceElement(className, methodName, fileName, lineNumber, codeLocation, version, exact);
			result.setClassLoaderName(classLoaderName);
			result.setModuleName(moduleName);
			result.setModuleVersion(moduleVersion);
			return result;
		}
		return null;
	}
}