| /* |
| * Copyright (c) 2017, 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.xml.internal; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| 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 contains utility methods for reading resources in the JAXP packages |
| */ |
| class SecuritySupport { |
| /** |
| * Cache for properties in java.home/lib/jaxp.properties |
| */ |
| static final Properties cacheProps = new Properties(); |
| |
| /** |
| * Flag indicating whether java.home/lib/jaxp.properties has been read |
| */ |
| static volatile boolean firstTime = true; |
| |
| private SecuritySupport() {} |
| |
| /** |
| * Reads JAXP system property with privilege |
| * |
| * @param propName the name of the property |
| * @return the value of the property |
| */ |
| public static String getSystemProperty(final String propName) { |
| return AccessController.doPrivileged(new PrivilegedAction<String>() { |
| @Override |
| public String run() { |
| return System.getProperty(propName); |
| } |
| }); |
| } |
| |
| /** |
| * Reads a system property. |
| * |
| * @param <T> the type of the property value |
| * @param type the type of the property value |
| * @param propName the name of the property |
| * @param defValue the default value |
| * @return the value of the property, or the default value of no system |
| * property is found |
| */ |
| public static <T> T getJAXPSystemProperty(Class<T> type, String propName, String defValue) { |
| String value = getJAXPSystemProperty(propName); |
| if (value == null) { |
| value = defValue; |
| } |
| if (Integer.class.isAssignableFrom(type)) { |
| return type.cast(Integer.parseInt(value)); |
| } else if (Boolean.class.isAssignableFrom(type)) { |
| return type.cast(Boolean.parseBoolean(value)); |
| } |
| return type.cast(value); |
| } |
| |
| /** |
| * Reads JAXP system property in this order: system property, |
| * $java.home/lib/jaxp.properties if the system property is not specified |
| * |
| * @param propName the name of the property |
| * @return the value of the property |
| */ |
| public static String getJAXPSystemProperty(String propName) { |
| String value = getSystemProperty(propName); |
| if (value == null) { |
| value = readJAXPProperty(propName); |
| } |
| return value; |
| } |
| |
| /** |
| * Reads the specified property from $java.home/lib/jaxp.properties |
| * |
| * @param propName the name of the property |
| * @return the value of the property |
| */ |
| public static String readJAXPProperty(String propName) { |
| String value = null; |
| InputStream is = null; |
| try { |
| if (firstTime) { |
| synchronized (cacheProps) { |
| if (firstTime) { |
| String configFile = getSystemProperty("java.home") + File.separator |
| + "lib" + File.separator + "jaxp.properties"; |
| File f = new File(configFile); |
| if (getFileExists(f)) { |
| is = getFileInputStream(f); |
| cacheProps.load(is); |
| } |
| firstTime = false; |
| } |
| } |
| } |
| value = cacheProps.getProperty(propName); |
| |
| } catch (IOException ex) { |
| } finally { |
| if (is != null) { |
| try { |
| is.close(); |
| } catch (IOException ex) {} |
| } |
| } |
| |
| return value; |
| } |
| |
| //------------------- private methods --------------------------- |
| static boolean getFileExists(final File f) { |
| return AccessController.doPrivileged(new PrivilegedAction<Boolean>() { |
| @Override |
| public Boolean run() { |
| return f.exists() ? Boolean.TRUE : Boolean.FALSE; |
| } |
| }); |
| } |
| |
| static FileInputStream getFileInputStream(final File file) throws FileNotFoundException { |
| try { |
| return AccessController.doPrivileged(new PrivilegedExceptionAction<FileInputStream>() { |
| @Override |
| public FileInputStream run() throws Exception { |
| return new FileInputStream(file); |
| } |
| }); |
| } catch (PrivilegedActionException e) { |
| throw (FileNotFoundException) e.getException(); |
| } |
| } |
| } |