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package oracle.toplink.essentials.internal.helper;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import oracle.toplink.essentials.Version;
import oracle.toplink.essentials.exceptions.ValidationException;
import oracle.toplink.essentials.internal.security.PrivilegedAccessHelper;
import oracle.toplink.essentials.internal.security.PrivilegedNewInstanceFromClass;
import oracle.toplink.essentials.internal.security.PrivilegedClassForName;
/**
* INTERNAL:
* JavaPlatform abstracts the version of the JDK we are using. It allows any operation
* which is dependant on JDK version to be called from a single place and then delegates
* the call to its JDKPlatform
* @see JDPlatform
* @author Tom Ware
*/
public class JavaPlatform {
private static JDKPlatform platform = null;
// 3 possible states are required for conforming like
public static final int FALSE = 0;
public static final int TRUE = 1;
public static final int UNDEFINED = 2;
/**
* INTERNAL:
* Get the version of JDK being used from the Version class.
* @return JDKPlatform a platform appropriate for the version of JDK being used.
*/
private static JDKPlatform getPlatform() {
if (platform == null) {
if (Version.isJDK15()) {
try {
Class platformClass = null;
// use class.forName() to avoid loading the JDK 1.5 class unless it is needed.
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()){
try {
platformClass = (Class)AccessController.doPrivileged(new PrivilegedClassForName("oracle.toplink.essentials.internal.helper.JDK15Platform"));
} catch (PrivilegedActionException exception) {
}
} else {
platformClass = oracle.toplink.essentials.internal.security.PrivilegedAccessHelper.getClassForName("oracle.toplink.essentials.internal.helper.JDK15Platform");
}
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()){
try {
platform = (JDKPlatform)AccessController.doPrivileged(new PrivilegedNewInstanceFromClass(platformClass));
} catch (PrivilegedActionException exception) {
}
} else {
platform = (JDKPlatform)PrivilegedAccessHelper.newInstanceFromClass(platformClass);
}
} catch (Exception exception) {
}
}
if (platform == null) {
platform = new JDK15Platform();
}
}
return platform;
}
/**
* INTERNAL:
* Conform an expression which uses the operator "like" for an in-memory query
* @return int
* int FALSE = 0 - if the expression does not conform
* int TRUE = 1 - if the expression does conform
* int UNDEFINED = 2 - if it cannot be determined if the expression conforms
*/
public static int conformLike(Object left, Object right) {
return getPlatform().conformLike(left, right);
}
/**
* INTERNAL:
* Get the milliseconds from a Calendar.
* @param calendar the instance of calendar to get the millis from
* @return long the number of millis
*/
public static long getTimeInMillis(java.util.Calendar calendar) {
return getPlatform().getTimeInMillis(calendar);
}
/**
* INTERNAL:
* Get the Map to store the query cache in
*/
public static java.util.Map getQueryCacheMap() {
return getPlatform().getQueryCacheMap();
}
/**
* INTERNAL:
* Set the milliseconds for a Calendar.
*/
public static void setTimeInMillis(java.util.Calendar calendar, long millis) {
getPlatform().setTimeInMillis(calendar, millis);
}
/**
* INTERNAL:
* Set the cause of an exception. This is useful for JDK 1.4 exception chaining
* @param java.lang.Throwable the exception to set the cause for
* @param java.lang.Throwable the cause of this exception
*/
public static void setExceptionCause(Throwable exception, Throwable cause) {
getPlatform().setExceptionCause(exception, cause);
}
/**
* INTERNAL
* return a boolean which determines where TopLink should include the TopLink-stored
* Internal exception in it's stack trace. For JDK 1.4 VMs with exception chaining
* the Internal exception can be redundant and confusing.
* @return boolean
*/
public static boolean shouldPrintInternalException() {
return getPlatform().shouldPrintInternalException();
}
}
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