ilene 2003/01/14 13:32:33
Modified: java/src/org/apache/xml/dtm DTMManager.java
Added: java/src/org/apache/xml/dtm SecuritySupport.java
FactoryFinder.java SecuritySupport12.java
Log:
Committing changes in response to bugzilla #12481.
Before this commit, DTMManager.newInstance cached the found class
in the cases where the class was identified in jaxp.properties or the class
path.
There were some problems with this:
1. It was not thread-safe because access to the static field foundFactory was
not synchronized.
2. We weren't caching the class when we defaulted to the fallback class (this
was the original issue in the bug report.)
3. We weren't using the AccessController class available in JDK1.2 to control
acess to priviliged resources (eg. system properties, files).
4. DTMManager would never be specified in jaxp.properties because it's
not part of the JAXP specification.
5. We aren't using context class loaders.
So, I have made the following changes:
1. Taken the FactoryFinder, SecuritySupport and SecuritySupport12 classes
from the JAXP subdirectories (in xml-commons) and used them as the basis
for the lookup of the DTMManager class. This gives us the AccessController
code.
2. Removed the context class loader support and added a cache for
the found class (which gets used if the system property is not set.)
If we want context class loader support in the future (which we probably)
do, then we will need to revisit this to see if caching the class loader
and the
class would work.
3. Synchronized access to the found class.
4. Instead of looking in jaxp.properties, look in xalan.properties (a xalan
specific configuration file) which can be placed in <$JAVA_HOME>/jre/lib.
Possible issues:
1. In general, using a cache means that the class will not change,
regardless of changes to xalan.properties or the class loader.
Revision Changes Path
1.11 +14 -174 xml-xalan/java/src/org/apache/xml/dtm/DTMManager.java
Index: DTMManager.java
===================================================================
RCS file: /home/cvs/xml-xalan/java/src/org/apache/xml/dtm/DTMManager.java,v
retrieving revision 1.10
retrieving revision 1.11
diff -u -r1.10 -r1.11
--- DTMManager.java 13 May 2002 22:17:42 -0000 1.10
+++ DTMManager.java 14 Jan 2003 21:32:33 -0000 1.11
@@ -56,22 +56,10 @@
*/
package org.apache.xml.dtm;
-import java.io.IOException;
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.io.BufferedReader;
-
-import java.util.Properties;
-import java.util.Enumeration;
-
-import org.apache.xml.utils.PrefixResolver;
-import org.apache.xml.utils.XMLString;
-import org.apache.xml.utils.XMLStringFactory;
-
import org.apache.xalan.res.XSLMessages;
import org.apache.xalan.res.XSLTErrorResources;
+import org.apache.xml.utils.PrefixResolver;
+import org.apache.xml.utils.XMLStringFactory;
/**
* A DTMManager instance can be used to create DTM and
@@ -176,34 +164,22 @@
throws DTMConfigurationException
{
- String classname = findFactory(defaultPropName,
-
"org.apache.xml.dtm.ref.DTMManagerDefault");
+
+ DTMManager factoryImpl = null;
+ try {
+ factoryImpl = (DTMManager) FactoryFinder.find(defaultPropName,
+ /* The fallback implementation class name */
+ "org.apache.xml.dtm.ref.DTMManagerDefault");
+ } catch (FactoryFinder.ConfigurationError e) {
+ throw new
DTMConfigurationException(XSLMessages.createMessage(XSLTErrorResources.ER_NO_DEFAULT_IMPL,
null)); //"No default implementation found");
+ }
- if (classname == null)
+
+ if (factoryImpl == null)
{
throw new
DTMConfigurationException(XSLMessages.createMessage(XSLTErrorResources.ER_NO_DEFAULT_IMPL,
null)); //"No default implementation found");
}
- DTMManager factoryImpl;
-
- try
- {
- Class clazz = Class.forName(classname);
-
- factoryImpl = (DTMManager) clazz.newInstance();
- }
- catch (ClassNotFoundException cnfe)
- {
- throw new DTMConfigurationException(cnfe);
- }
- catch (IllegalAccessException iae)
- {
- throw new DTMConfigurationException(iae);
- }
- catch (InstantiationException ie)
- {
- throw new DTMConfigurationException(ie);
- }
factoryImpl.setXMLStringFactory(xsf);
return factoryImpl;
@@ -365,14 +341,7 @@
// -------------------- private methods --------------------
- /**
- * Avoid reading all the files when the findFactory
- * method is called the second time (cache the result of
- * finding the default impl).
- */
- private static String foundFactory = null;
-
- /**
+ /**
* Temp debug code - this will be removed after we test everything
*/
private static boolean debug;
@@ -385,135 +354,6 @@
}
catch (SecurityException ex){}
}
-
- /**
- * Private implementation method - will find the implementation
- * class in the specified order.
- *
- * @param factoryId Name of the factory interface.
- * @param xmlProperties Name of the properties file based on JAVA/lib.
- * @param defaultFactory Default implementation, if nothing else is found.
- *
- * @return The factory class name.
- */
- private static String findFactory(String factoryId, String defaultFactory)
- {
-
- // Use the system property first
- try
- {
- String systemProp = null;
-
- try
- {
- systemProp = System.getProperty(factoryId);
- }
- catch (SecurityException se){}
-
- if (systemProp != null)
- {
- if (debug)
- {
- System.err.println("DTM: found system property" + systemProp);
- }
-
- return systemProp;
- }
- }
- catch (SecurityException se){}
-
- if (foundFactory != null)
- {
- return foundFactory;
- }
-
- // try to read from $java.home/lib/jaxp.properties
- try
- {
- String javah = System.getProperty("java.home");
- String configFile = javah + File.separator + "lib" + File.separator
- + "jaxp.properties";
- File f = new File(configFile);
-
- if (f.exists())
- {
- Properties props = new Properties();
-
- props.load(new FileInputStream(f));
-
- foundFactory = props.getProperty(factoryId);
-
- if (debug)
- {
- System.err.println("DTM: found java.home property " +
foundFactory);
- }
-
- if (foundFactory != null)
- {
- return foundFactory;
- }
- }
- }
- catch (Exception ex)
- {
- if (debug)
- {
- ex.printStackTrace();
- }
- }
-
- String serviceId = "META-INF/services/" + factoryId;
-
- // try to find services in CLASSPATH
- try
- {
- ClassLoader cl = DTMManager.class.getClassLoader();
- InputStream is = null;
-
- if (cl == null)
- {
- is = ClassLoader.getSystemResourceAsStream(serviceId);
- }
- else
- {
- is = cl.getResourceAsStream(serviceId);
- }
-
- if (is != null)
- {
- if (debug)
- {
- System.err.println("DTM: found " + serviceId);
- }
-
- BufferedReader rd = new BufferedReader(new InputStreamReader(is,
"UTF-8"));
-
- foundFactory = rd.readLine();
-
- rd.close();
-
- if (debug)
- {
- System.err.println("DTM: loaded from services: " + foundFactory);
- }
-
- if ((foundFactory != null) &&!"".equals(foundFactory))
- {
- return foundFactory;
- }
- }
- }
- catch (Exception ex)
- {
- if (debug)
- {
- ex.printStackTrace();
- }
- }
-
- return defaultFactory;
- }
-
/** This value, set at compile time, controls how many bits of the
* DTM node identifier numbers are used to identify a node within a
1.1
xml-xalan/java/src/org/apache/xml/dtm/SecuritySupport.java
Index: SecuritySupport.java
===================================================================
/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The name "Apache Software Foundation" must not be used to endorse or
* promote products derived from this software without prior written
* permission. For written permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999-2002, Sun Microsystems,
* Inc., http://www.sun.com. For more information on the Apache Software
* Foundation, please see <http://www.apache.org/>.
*/
package org.apache.xml.dtm;
import java.lang.reflect.*;
import java.net.*;
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.
*/
public static SecuritySupport getInstance() {
return (SecuritySupport)securitySupport;
}
public ClassLoader getContextClassLoader() {
return null;
}
public String getSystemProperty(String propName) {
return System.getProperty(propName);
}
public FileInputStream getFileInputStream(File file)
throws FileNotFoundException
{
return new FileInputStream(file);
}
public InputStream getResourceAsStream(ClassLoader cl, String name) {
InputStream ris;
if (cl == null) {
ris = ClassLoader.getSystemResourceAsStream(name);
} else {
ris = cl.getResourceAsStream(name);
}
return ris;
}
}
1.1 xml-xalan/java/src/org/apache/xml/dtm/FactoryFinder.java
Index: FactoryFinder.java
===================================================================
/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The name "Apache Software Foundation" must not be used to endorse or
* promote products derived from this software without prior written
* permission. For written permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999-2001, Sun Microsystems,
* Inc., http://www.sun.com. For more information on the Apache Software
* Foundation, please see <http://www.apache.org/>.
*/
package org.apache.xml.dtm;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Properties;
/**
* This class is based on the FactoryFinder classes in the JAXP subpackages
* in the xml-commons project (xml-apis.jar)
*
* This copy of FactoryFinder is for the DTMManager. It caches the class
* name after it is found the first time, if the System.property is not set.
* If the System.property is set, then it is always used.
*
* It does not use context class loaders, but we will probably need to add
* this support in the future. Question: If we use context class loaders, can
* we still cache the class (do we need to also cache the class loader for
* comparison purposes)?
*
* @author Edwin Goei, Ilene Seelemann
*/
class FactoryFinder {
/** Controls debugging output to stderr */
private static boolean debug;
/**
* Avoid reading all the files when the findFactory
* method is called the second time (cache the result of
* finding the default impl).
*/
private static String foundFactory = null;
// Define system property "jaxp.debug" to get output
static {
try {
String val =
SecuritySupport.getInstance().getSystemProperty("jaxp.debug");
// Allow simply setting the prop to turn on debug
debug = val != null && (! "false".equals(val));
} catch (SecurityException se) {
debug = false;
}
}
/**
* Main entry point. Finds and creates a new instance of a concrete
* factory implementation in the specified order as stated in the JAXP
* spec. This code attempts to find a factory implementation in
* serveral locations. If one fails, the next one is tried. To be
* more robust, this occurs even if a SecurityException is thrown, but
* perhaps it may be better to propogate the SecurityException instead,
* so SecurityException-s are not masked.
*
* @return A new instance of the concrete factory class, never null
*
* @param factoryId
* Name of the factory to find, same as a property name
*
* @param fallbackClassName
* Implementation class name, if nothing else is found. Use
* null to mean not to use a fallback.
*
* @throws FactoryFinder.ConfigurationError
* If a factory instance cannot be returned
*
* Package private so this code can be shared.
*/
static Object find(String factoryId, String fallbackClassName)
throws ConfigurationError
{
SecuritySupport ss = SecuritySupport.getInstance();
ClassLoader cl = FactoryFinder.class.getClassLoader();
dPrint("find factoryId=" + factoryId);
// Use the system property first
try {
String systemProp = ss.getSystemProperty(factoryId);
if (systemProp != null) {
dPrint("found system property, value=" + systemProp);
return newInstance(systemProp, cl, true);
}
} catch (SecurityException se) {
// Ignore and continue w/ next location
}
synchronized (FactoryFinder.class) {
// This block will only run once, and then foundFactory will
// be set and immutable. Currently there is no support in this
// class for context class loaders. If the contents of the
// xalan.properties file changes, or the class loader changes,
// this will *not* affect the cached class.
if (foundFactory == null) {
// Try to read from $java.home/lib/xalan.properties
Properties xalanProperties = null;
try {
String javah = ss.getSystemProperty("java.home");
String configFile = javah + File.separator +
"lib" + File.separator + "xalan.properties";
File f = new File(configFile);
FileInputStream fis = ss.getFileInputStream(f);
xalanProperties = new Properties();
xalanProperties.load(fis);
fis.close();
} catch (Exception x) {
// assert(x instanceof FileNotFoundException
// || x instanceof SecurityException)
// In both cases, ignore and continue w/ next location
}
if (xalanProperties != null) {
foundFactory = xalanProperties.getProperty(factoryId);
if (foundFactory != null) {
dPrint("found in xalan.properties, value=" +
foundFactory);
}
} else {
// Try Jar Service Provider Mechanism
// (foundFactory gets set in findJarServiceProvider
method)
findJarServiceProvider(factoryId);
if (foundFactory == null) {
if (fallbackClassName == null) {
throw new ConfigurationError(
"Provider for " + factoryId + " cannot be found",
null);
}
dPrint("using fallback, value=" + fallbackClassName);
foundFactory = fallbackClassName;
}
}
}
}
return newInstance(foundFactory, cl, true);
}
private static void dPrint(String msg) {
if (debug) {
System.err.println("JAXP: " + msg);
}
}
/**
* Create an instance of a class using the specified ClassLoader and
* optionally fall back to the current ClassLoader if not found.
*
* @param className Name of the concrete class corresponding to the
* service provider
*
* @param cl ClassLoader to use to load the class, null means to use
* the bootstrap ClassLoader
*
* @param doFallback true if the current ClassLoader should be tried as
* a fallback if the class is not found using cl
*/
private static Object newInstance(String className, ClassLoader cl,
boolean doFallback)
throws ConfigurationError
{
// assert(className != null);
try {
Class providerClass;
if (cl == null) {
// XXX Use the bootstrap ClassLoader. There is no way to
// load a class using the bootstrap ClassLoader that works
// in both JDK 1.1 and Java 2. However, this should still
// work b/c the following should be true:
//
// (cl == null) iff current ClassLoader == null
//
// Thus Class.forName(String) will use the current
// ClassLoader which will be the bootstrap ClassLoader.
providerClass = Class.forName(className);
} else {
try {
providerClass = cl.loadClass(className);
} catch (ClassNotFoundException x) {
if (doFallback) {
// Fall back to current classloader
cl = FactoryFinder.class.getClassLoader();
providerClass = cl.loadClass(className);
} else {
throw x;
}
}
}
Object instance = providerClass.newInstance();
dPrint("created new instance of " + providerClass +
" using ClassLoader: " + cl);
return instance;
} catch (ClassNotFoundException x) {
throw new ConfigurationError(
"Provider " + className + " not found", x);
} catch (Exception x) {
throw new ConfigurationError(
"Provider " + className + " could not be instantiated: " + x,
x);
}
}
/*
* Try to find provider using Jar Service Provider Mechanism
*
* @return instance of provider class if found or null
*/
private static String findJarServiceProvider(String factoryId)
throws ConfigurationError
{
SecuritySupport ss = SecuritySupport.getInstance();
String serviceId = "META-INF/services/" + factoryId;
InputStream is = null;
// No support yet for context class loader
ClassLoader cl = FactoryFinder.class.getClassLoader();
is = ss.getResourceAsStream(cl, serviceId);
if (is == null) {
// No provider found
return null;
}
dPrint("found jar resource=" + serviceId +
" using ClassLoader: " + cl);
// Read the service provider name in UTF-8 as specified in
// the jar spec. Unfortunately this fails in Microsoft
// VJ++, which does not implement the UTF-8
// encoding. Theoretically, we should simply let it fail in
// that case, since the JVM is obviously broken if it
// doesn't support such a basic standard. But since there
// are still some users attempting to use VJ++ for
// development, we have dropped in a fallback which makes a
// second attempt using the platform's default encoding. In
// VJ++ this is apparently ASCII, which is a subset of
// UTF-8... and since the strings we'll be reading here are
// also primarily limited to the 7-bit ASCII range (at
// least, in English versions), this should work well
// enough to keep us on the air until we're ready to
// officially decommit from VJ++. [Edited comment from
// jkesselm]
BufferedReader rd;
try {
rd = new BufferedReader(new InputStreamReader(is, "UTF-8"));
} catch (java.io.UnsupportedEncodingException e) {
rd = new BufferedReader(new InputStreamReader(is));
}
String factoryClassName = null;
try {
// XXX Does not handle all possible input as specified by the
// Jar Service Provider specification
factoryClassName = rd.readLine();
rd.close();
} catch (IOException x) {
// No provider found
return null;
}
if (factoryClassName != null &&
! "".equals(factoryClassName)) {
dPrint("found in resource, value="
+ factoryClassName);
// Note: here we do not want to fall back to the current
// ClassLoader because we want to avoid the case where the
// resource file was found using one ClassLoader and the
// provider class was instantiated using a different one.
return factoryClassName;
}
// No provider found
return null;
}
static class ConfigurationError extends Error {
private Exception exception;
/**
* Construct a new instance with the specified detail string and
* exception.
*/
ConfigurationError(String msg, Exception x) {
super(msg);
this.exception = x;
}
Exception getException() {
return exception;
}
}
}
1.1
xml-xalan/java/src/org/apache/xml/dtm/SecuritySupport12.java
Index: SecuritySupport12.java
===================================================================
/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The name "Apache Software Foundation" must not be used to endorse or
* promote products derived from this software without prior written
* permission. For written permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999-2002, Sun Microsystems,
* Inc., http://www.sun.com. For more information on the Apache Software
* Foundation, please see <http://www.apache.org/>.
*/
package org.apache.xml.dtm;
import java.security.*;
import java.net.*;
import java.io.*;
import java.util.*;
/**
* 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 SecuritySupport12 extends SecuritySupport {
public ClassLoader getContextClassLoader() {
return (ClassLoader)
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
ClassLoader cl = null;
try {
cl = Thread.currentThread().getContextClassLoader();
} catch (SecurityException ex) { }
return cl;
}
});
}
public String getSystemProperty(final String propName) {
return (String)
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return System.getProperty(propName);
}
});
}
public 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();
}
}
public 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;
}
});
}
}
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