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NekoDTD is a configuration that parses Document Type Definition (DTD) files and converts the information into an XML document. This representation can then be processed using standard XML processors and applications to perform grammar analysis, convert the DTD into other grammar formats, etc. For example, using an XSLT stylesheet, the XML representation of the DTD can be converted to an equivalent XML Schema or Relax NG grammar. The NekoDTD parser configuration is written using the Xerces Native Interface (XNI) that is the foundation of the Xerces2 implementation. This enables you to use NekoDTD with existing XNI tools without modification or rewriting code.

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/*
 * Copyright 2002,2004 The Apache Software Foundation.
 * 
 * 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 org.cyberneko.dtd;

import java.io.*;

/**
 * This class is duplicated for each JAXP subpackage so keep it in sync.
 * It is package private and therefore is not exposed as part of the JAXP
 * API.
 *
 * Base class with security related methods that work on JDK 1.1.
 */
class SecuritySupport {

    /*
     * Make this of type Object so that the verifier won't try to
     * prove its type, thus possibly trying to load the SecuritySupport12
     * class.
     */
    private static final Object securitySupport;

    static {
	SecuritySupport ss = null;
	try {
	    Class c = Class.forName("java.security.AccessController");
	    // if that worked, we're on 1.2.
	    /*
	    // don't reference the class explicitly so it doesn't
	    // get dragged in accidentally.
	    c = Class.forName("javax.mail.SecuritySupport12");
	    Constructor cons = c.getConstructor(new Class[] { });
	    ss = (SecuritySupport)cons.newInstance(new Object[] { });
	    */
	    /*
	     * Unfortunately, we can't load the class using reflection
	     * because the class is package private.  And the class has
	     * to be package private so the APIs aren't exposed to other
	     * code that could use them to circumvent security.  Thus,
	     * we accept the risk that the direct reference might fail
	     * on some JDK 1.1 JVMs, even though we would never execute
	     * this code in such a case.  Sigh...
	     */
	    ss = new SecuritySupport12();
	} catch (Exception ex) {
	    // ignore it
	} finally {
	    if (ss == null)
		ss = new SecuritySupport();
	    securitySupport = ss;
	}
    }

    /**
     * Return an appropriate instance of this class, depending on whether
     * we're on a JDK 1.1 or J2SE 1.2 (or later) system.
     */
    static SecuritySupport getInstance() {
	return (SecuritySupport)securitySupport;
    }

    ClassLoader getContextClassLoader() {
	return null;
    }

    ClassLoader getSystemClassLoader() {
        return null;
    }

    ClassLoader getParentClassLoader(ClassLoader cl) {
        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();
    }
}