/*
 * Copyright (c) 2004, 2016, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * questions.
 */

package org.xml.sax.helpers;

import java.io.*;
import java.security.*;

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.
Security related methods that only work on J2SE 1.2 and newer.
/**
 * 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.
 *
 * Security related methods that only work on J2SE 1.2 and newer.
 */
class SecuritySupport  {

    
Returns the current thread's context class loader, or the system class loader
if the context class loader is null.
Throws:
SecurityException – 
Returns:
the current thread's context class loader, or the system class loader/**
     * Returns the current thread's context class loader, or the system class loader
     * if the context class loader is null.
     * @return the current thread's context class loader, or the system class loader
     * @throws SecurityException
     */
    ClassLoader getClassLoader() throws SecurityException{
        return AccessController.doPrivileged((PrivilegedAction<ClassLoader>)() -> {
            ClassLoader cl = Thread.currentThread().getContextClassLoader();
            if (cl == null) {
                cl = ClassLoader.getSystemClassLoader();
            }

            return cl;
        });
    }

    String getSystemProperty(final String propName) {
        return AccessController.doPrivileged((PrivilegedAction<String>)()
                -> System.getProperty(propName));
    }

    FileInputStream getFileInputStream(final File file)
        throws FileNotFoundException
    {
        try {
            return AccessController.doPrivileged((PrivilegedExceptionAction<FileInputStream>)() ->
                    new FileInputStream(file));
        } catch (PrivilegedActionException e) {
            throw (FileNotFoundException)e.getException();
        }
    }


    InputStream getResourceAsStream(final ClassLoader cl, final String name)
    {
        return AccessController.doPrivileged((PrivilegedAction<InputStream>) () -> {
            InputStream ris;
            if (cl == null) {
                ris = SecuritySupport.class.getResourceAsStream(name);
            } else {
                ris = cl.getResourceAsStream(name);
            }
            return ris;
        });
    }

    boolean doesFileExist(final File f) {
        return (AccessController.doPrivileged((PrivilegedAction<Boolean>)() ->
                new Boolean(f.exists())));
    }

}