java解析xml文档的性能测试

/* * Copyright (c) 2000-2001 Sosnoski Software Solutions, Inc. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ package com.sosnoski.xmlbench; import java.io.*; import java.util.*; import javax.xml.parsers.*; import org.xml.sax.*; import org.xml.sax.helpers.*; /** * Benchmark program for comparing performance of Java XML parsers and * document representations. Performance is measured in terms of both * speed and memory requirement for constructing the document representation * from a SAX parse, and in terms of speed for walking the representation and * generating text output. * * @author Dennis M. Sosnoski * @version 1.2 */ public class XMLBench { /** Wait time between test documents (ms). */ public static final int DELAY_BETWEEN_DOCUMENTS = 400; /** Output line length for brief format. */ public static final int BRIEF_LINE_LENGTH = 80; /** Width of each item field in brief format. */ public static final int BRIEF_ITEM_WIDTH = 16; /** Number of brief format items per output line. */ public static final int BRIEF_PER_LINE = BRIEF_LINE_LENGTH/BRIEF_ITEM_WIDTH; /** * Get test object. Constructs and returns an instance of the appropriate * test class. * * @param name document model name to be tested * @return document model test class instance (null if name not recognized) */ private static BenchBase getTestInstance(String name) { if (name.equalsIgnoreCase("SAX")) { return new BenchSAX(); } else if (name.equalsIgnoreCase("Crimson")) { return new BenchCrimson(); } else if (name.equalsIgnoreCase("JDOM")) { return new BenchJDOM(); } else if (name.equalsIgnoreCase("dom4j")) { return new BenchDOM4J(); } else if (name.equalsIgnoreCase("Xerces")) { return new BenchXercesBase(); } else if (name.equalsIgnoreCase("XercesD")) { return new BenchXercesDeferred(); } else if (name.equalsIgnoreCase("Xerces2")) { return new BenchXerces2Base(); } else if (name.equalsIgnoreCase("Xerces2D")) { return new BenchXerces2Deferred(); } else if (name.equalsIgnoreCase("EXML")) { return new BenchElectric(); } else if (name.equalsIgnoreCase("XPP")) { return new BenchXPPBase(); } else if (name.equalsIgnoreCase("XPPp")) { return new BenchXPPPull(); } return null; } /** * Read contents of file into byte array. * * @param file file to be read * @return array of bytes containing all data from file * @throws IOException on file access error */ private static byte[] getFileBytes(File file) throws IOException { int length = (int)file.length(); byte[]data = new byte[length]; FileInputStream in = new FileInputStream(file); int offset = 0; do { offset += in.read(data, offset, length-offset); } while (offset < data.length); return data; } /** * Load data for file or directory argument. If the supplied path is a * file, the returned array of arrays consists of a single byte array * containing the date from that file. If the path is a directory, the * returned array contains one value array for each file in the * target directory. * * @param path file or directory path * @return array of arrays of bytes containing all data from file(s) * @throws IOException on file access error */ private static byte[][] getPathData(String path) throws IOException { // check type of path supplied File file = new File(path); Vector data = new Vector(); if (file.isDirectory()) { // get array of files in this directory File[] files = file.listFiles(); byte[][] arrays = new byte[files.length][]; long[] stamps = new long[files.length]; // String[] names = new String[files.length]; int count = 0; for (int i = 0; i < files.length; i++) { if (files[i].isFile()) { arrays[count] = getFileBytes(files[i]); // names[count] = files[i].getName(); stamps[count++] = files[i].lastModified(); } } // (bubble) sort results by modify date of file for (int i = 0; i < count; i++) { for (int j = i+1; j < count; j++) { if (stamps[j] < stamps[i]) { long stamp = stamps[j]; stamps[j] = stamps[i]; stamps[i] = stamp; byte[] array = arrays[j]; arrays[j] = arrays[i]; arrays[i] = array; // String name = names[j]; // names[j] = names[i]; // names[i] = name; } } // System.out.println(" sorted " + names[i]); } // convert results to sized array byte[][] results = new byte[count][]; System.arraycopy(arrays, 0, results, 0, count); return results; } else { byte[][] results = new byte[1][]; results[0] = getFileBytes(file); return results; } } /** * Show test file results in brief format. This prints the results with * multiple values per line, using the abbreviated value descriptions. * * @param values test result values (unreported values ignored) * @param descripts value description texts */ private static void showBrief(int[] values, String[] descripts) { StringBuffer line = new StringBuffer(BRIEF_LINE_LENGTH); int position = 0; for (int j = 0; j < values.length; j++) { if (values[j] != Integer.MIN_VALUE) { if (position == 0) { if (j > 0) { System.out.println(line); line.setLength(0); } } else { int end = position*BRIEF_ITEM_WIDTH; while (line.length() < end) { line.append(' '); } } line.append(' '); line.append(descripts[j]); line.append('='); line.append(values[j]); position = (position+1) % BRIEF_PER_LINE; } } System.out.println(line); } /** * Show test file results in full format. This prints the results with * a single value per line, using the detailed value descriptions. * * @param values test result values (unreported values ignored) * @param descripts value description texts */ private static void showFull(int[] values, String[] descripts) { for (int j = 0; j < values.length; j++) { if (values[j] != Integer.MIN_VALUE) { System.out.println(' ' + descripts[j] + " = " + values[j]); } } } /** * Build text for showing results in compressed format. This uses an * abbreviated value description followed by the corresponding result * values for all test files in sequence, with comma separators. * * @param values array of test result value arrays * @param descripts value description texts * @param line buffer for output text accumulation */ private static void buildCompressed(int[][] values, String[] descripts, StringBuffer line) { int fcnt = values.length; int vcnt = values[0].length; for (int i = 0; i < vcnt; i++) { line.append(','); line.append(descripts[i]); for (int j = 0; j < fcnt; j++) { line.append(','); if (values[j][i] != Integer.MIN_VALUE) { line.append(values[j][i]); } } } } /** * Test driver, just reads the input parameters and executes the test. * * @param argv command line arguments */