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Jing is a validator for RELAX NG and other schema languages. This project was taken from http://code.google.com/p/jing-trang and mavenized for inclusion in the Wicket Stuff HTML Validator. The code was taken from the 20091111 release.

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package com.thaiopensource.relaxng.util;

import com.thaiopensource.util.OptionParser;
import com.thaiopensource.util.PropertyMapBuilder;
import com.thaiopensource.util.Localizer;
import com.thaiopensource.validate.ValidateProperty;
import com.thaiopensource.validate.ValidationDriver;
import com.thaiopensource.validate.prop.rng.RngProperty;
import com.thaiopensource.xml.sax.ErrorHandlerImpl;
import com.thaiopensource.datatype.DatatypeLibraryLoader;
import org.xml.sax.SAXException;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;

class TestDriver {
  static public void main(String[] args) throws IOException {
    System.exit(new TestDriver().doMain(args));
  }

  private ValidationDriver driver;
  private ErrorHandlerImpl eh;
  private Localizer localizer = new Localizer(TestDriver.class);
  private int nTests = 0;

  public int doMain(String[] args) throws IOException {
    long startTime = System.currentTimeMillis();
    eh = new ErrorHandlerImpl(System.out);
    OptionParser op = new OptionParser("i", args);
    PropertyMapBuilder properties = new PropertyMapBuilder();
    // This is an optimization.  It ensures that all SchemaReaders share a
    // single DatatypeLibraryLoader.
    properties.put(RngProperty.DATATYPE_LIBRARY_FACTORY, new DatatypeLibraryLoader());
    try {
      while (op.moveToNextOption()) {
        switch (op.getOptionChar()) {
        case 'i':
          RngProperty.CHECK_ID_IDREF.add(properties);
          break;
        }
      }
    }
    catch (OptionParser.InvalidOptionException e) {
      eh.print(localizer.message("invalid_option", op.getOptionCharString()));
      return 2;
    }
    catch (OptionParser.MissingArgumentException e) {
      eh.print(localizer.message("option_missing_argument", op.getOptionCharString()));
      return 2;
    }
    args = op.getRemainingArgs();
    eh = new ErrorHandlerImpl(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(args[0]))));
    properties.put(ValidateProperty.ERROR_HANDLER, eh);
    driver = new ValidationDriver(properties.toPropertyMap());
    int result = 0;
    for (int i = 1; i < args.length; i++) {
      int n = runTestSuite(new File(args[i]));
      if (n > result)
	result = n;
    }
    System.err.println("Number of tests: " + nTests);
    System.err.println("Elapsed time: " + (System.currentTimeMillis() - startTime));
    eh.close();
    return result;
  }

  private static final String CORRECT_SCHEMA_NAME = "c.rng";
  private static final String INCORRECT_SCHEMA_NAME = "i.rng";
  private static final String VALID_INSTANCE_SUFFIX = ".v.xml";
  private static final String INVALID_INSTANCE_SUFFIX = ".i.xml";
  
  public int runTestSuite(File dir) throws IOException {
    int result = 0;
    String[] subdirs = dir.list();
    for (int i = 0; i < subdirs.length; i++) {
      File subdir = new File(dir, subdirs[i]);
      if (subdir.isDirectory()) {
	int n = runTestCase(subdir);
	if (n > result)
	  result = n;
      }
    }
    return result;
  }

  private int runTestCase(File dir) throws IOException {
    File f = new File(dir, INCORRECT_SCHEMA_NAME);
    if (f.exists()) {
      if (loadSchema(f)) {
	failed(f);
	return 1;
      }
      return 0;
    }
    f = new File(dir, CORRECT_SCHEMA_NAME);
    if (!f.exists())
      return 0;
    if (!loadSchema(f)) {
      failed(f);
      return 1;
    }
    String[] files = dir.list();
    int result = 0;
    for (int i = 0; i < files.length; i++) {
      if (files[i].endsWith(VALID_INSTANCE_SUFFIX)) {
	f = new File(dir, files[i]);
	if (!validateInstance(f)) {
	  failed(f);
	  result = 1;
	}
      }
      else if (files[i].endsWith(INVALID_INSTANCE_SUFFIX)) {
	f = new File(dir, files[i]);
	if (validateInstance(f)) {
	  failed(f);
	  result = 1;
	}
      }
    }
    return result;
  }

  private static void failed(File f) {
    System.err.println("Failed: " + f.toString());
  }

  private boolean loadSchema(File schema) throws IOException {
    nTests++;
    try {
      if (driver.loadSchema(ValidationDriver.fileInputSource(schema)))
	return true;
    }
    catch (SAXException e) {
      eh.printException(e);
    }
    return false;
  }

  private boolean validateInstance(File instance) throws IOException {
    nTests++;
    try {
      if (driver.validate(ValidationDriver.fileInputSource(instance)))
	return true;
    }
    catch (SAXException e) {
      eh.printException(e);
    }
    return false;
  }
}