package org.apache.xerces.parsers;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;

class SecuritySupport {
  private static final Object securitySupport;
  
  static {
    SecuritySupport ss = null;
    try {
      Class c = Class.forName("java.security.AccessController");
      ss = new SecuritySupport12();
    } catch (Exception ex) {
    
    } finally {
      if (ss == null)
        ss = new SecuritySupport(); 
      securitySupport = ss;
    } 
  }
  
  static SecuritySupport getInstance() {
    return (SecuritySupport)securitySupport;
  }
  
  ClassLoader getContextClassLoader() {
    return null;
  }
  
  String getSystemProperty(String propName) {
    return System.getProperty(propName);
  }
  
  FileInputStream getFileInputStream(File file) throws FileNotFoundException {
    return new FileInputStream(file);
  }
  
  InputStream getResourceAsStream(ClassLoader cl, String name) {
    InputStream ris;
    if (cl == null) {
      ris = ClassLoader.getSystemResourceAsStream(name);
    } else {
      ris = cl.getResourceAsStream(name);
    } 
    return ris;
  }
  
  boolean getFileExists(File f) {
    return f.exists();
  }
  
  long getLastModified(File f) {
    return f.lastModified();
  }
}