?? classutils.java
字號(hào):
/*
* Copyright 2004-2008 H2 Group. Licensed under the H2 License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.util;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashSet;
import org.h2.constant.ErrorCode;
import org.h2.constant.SysProperties;
import org.h2.message.Message;
/**
* This utility class contains functions related to class loading.
* There is a mechanism to restrict class loading.
*/
public class ClassUtils {
private static final boolean ALLOW_ALL;
private static final HashSet ALLOWED_CLASS_NAMES = new HashSet();
private static final String[] ALLOWED_CLASS_NAME_PREFIXES;
static {
String s = SysProperties.ALLOWED_CLASSES;
String[] list = StringUtils.arraySplit(s, ',', true);
ArrayList prefixes = new ArrayList();
boolean allowAll = false;
for (int i = 0; i < list.length; i++) {
String p = list[i];
if (p.equals("*")) {
allowAll = true;
} else if (p.endsWith("*")) {
prefixes.add(p.substring(0, p.length() - 1));
} else {
ALLOWED_CLASS_NAMES.add(p);
}
}
ALLOW_ALL = allowAll;
ALLOWED_CLASS_NAME_PREFIXES = new String[prefixes.size()];
prefixes.toArray(ALLOWED_CLASS_NAME_PREFIXES);
}
public static Class loadSystemClass(String className) throws ClassNotFoundException {
return Class.forName(className);
}
public static Class loadUserClass(String className) throws ClassNotFoundException, SQLException {
if (!ALLOW_ALL && !ALLOWED_CLASS_NAMES.contains(className)) {
boolean allowed = false;
for (int i = 0; i < ALLOWED_CLASS_NAME_PREFIXES.length; i++) {
String s = ALLOWED_CLASS_NAME_PREFIXES[i];
if (className.startsWith(s)) {
allowed = true;
}
}
if (!allowed) {
throw Message.getSQLException(ErrorCode.ACCESS_DENIED_TO_CLASS_1, className);
}
}
return Class.forName(className);
}
}
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