BenchCrimson.java :  » XML » tclib » com » sosnoski » xmlbench » Java Open Source

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package com.sosnoski.xmlbench;

import java.io.*;
import java.util.*;

import javax.xml.parsers.*;

import org.apache.crimson.jaxp.*;
import org.apache.crimson.tree.*;

/**
 * Benchmark for measuring performance of the Apache Crimson DOM document
 * representation. Since we may have several parsers and document models in
 * the classpath, this creates the Crimson parser directly in order to avoid
 * any confusion in going through JAXP.
 *
 * @author Dennis M. Sosnoski
 * @version 1.2
 */

public class BenchCrimson extends BenchDOM
{
  /** Document builder used within a test run. */
  private DocumentBuilder m_builder;

  /**
   * Constructor.
   */

  public BenchCrimson() {
    super("Crimson DOM");
  }

  /**
   * Build document representation by parsing XML. This implementation
   * creates a document builder if one does not already exist, then reuses
   * that builder for the duration of a test run..
   *
   * @param in XML document input stream
   * @return document representation
   */

  protected Object build(InputStream in) {
    if (m_builder == null) {
      DocumentBuilderFactory dbf =
        DocumentBuilderFactoryImpl.newInstance();
      try {
        dbf.setValidating(false);
        dbf.setNamespaceAware(true);
        m_builder = dbf.newDocumentBuilder();
      } catch (Exception ex) {
        ex.printStackTrace(System.err);
        System.exit(0);
      }
    }
    Object doc = null;
    try {
      doc = m_builder.parse(in);
    } catch (Exception ex) {
      ex.printStackTrace(System.err);
      System.exit(0);
    }
    return doc;
  }

  /**
   * Output a document as XML text. This method uses the method defined
   * by the Crimson DOM to output a text representation of the document.
   *
   * @param doc document representation to be output
   * @param out XML document output stream
   */

  protected void output(Object doc, OutputStream out) {
    XmlDocument cdoc = (XmlDocument)doc;
    try {
      cdoc.write(out);
    } catch (Exception ex) {
      ex.printStackTrace(System.err);
      System.exit(0);
    }
  }

  /**
   * Reset test class instance. This discards the document builder used
   * within a test pass.
   */

  protected void reset() {
    m_builder = null;
  }
}