Package com.sun.org.apache.xml.internal.dtm

Source Code of com.sun.org.apache.xml.internal.dtm.SecuritySupport12

/*
* 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.
*/
/*
* $Id: SecuritySupport12.java,v 1.2.4.1 2005/09/15 08:14:56 suresh_emailid Exp $
*/

package com.sun.org.apache.xml.internal.dtm;

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

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;

import java.util.Properties;

/**
* This class is duplicated for each Xalan-Java subpackage so keep it in sync.
* It is package private and therefore is not exposed as part of the Xalan-Java
* API.
*
* Security related methods that only work on J2SE 1.2 and newer.
*/
class SecuritySupport12 extends SecuritySupport {

    ClassLoader getContextClassLoader() {
        return (ClassLoader)
                AccessController.doPrivileged(new PrivilegedAction() {
            public Object run() {
                ClassLoader cl = null;
                try {
                    cl = Thread.currentThread().getContextClassLoader();
                } catch (SecurityException ex) { }
                return cl;
            }
        });
    }

    ClassLoader getSystemClassLoader() {
        return (ClassLoader)
            AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    ClassLoader cl = null;
                    try {
                        cl = ClassLoader.getSystemClassLoader();
                    } catch (SecurityException ex) {}
                    return cl;
                }
            });
    }

    ClassLoader getParentClassLoader(final ClassLoader cl) {
        return (ClassLoader)
            AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    ClassLoader parent = null;
                    try {
                        parent = cl.getParent();
                    } catch (SecurityException ex) {}

                    // eliminate loops in case of the boot
                    // ClassLoader returning itself as a parent
                    return (parent == cl) ? null : parent;
                }
            });
    }

    String getSystemProperty(final String propName) {
        return (String)
            AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    return System.getProperty(propName);
                }
            });
    }

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

    InputStream getResourceAsStream(final ClassLoader cl,
                                           final String name)
    {
        return (InputStream)
            AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    InputStream ris;
                    if (cl == null) {
                        ris = ClassLoader.getSystemResourceAsStream(name);
                    } else {
                        ris = cl.getResourceAsStream(name);
                    }
                    return ris;
                }
            });
    }
   
    boolean getFileExists(final File f) {
    return ((Boolean)
            AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    return new Boolean(f.exists());
                }
            })).booleanValue();
    }
   
    long getLastModified(final File f) {
    return ((Long)
            AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    return new Long(f.lastModified());
                }
            })).longValue();
    }
       
}
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