/*******************************************************************************
* Copyright (c) 1998, 2008 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.internal.helper;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.util.*;
import org.eclipse.persistence.Version;
import org.eclipse.persistence.internal.security.PrivilegedAccessHelper;
import org.eclipse.persistence.internal.security.PrivilegedNewInstanceFromClass;
import org.eclipse.persistence.internal.security.PrivilegedClassForName;
/**
* INTERNAL:
* JavaPlatform abstracts the version of the JDK we are using. It allows any operation
* which is dependent 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 {
protected static JDKPlatform platform = null;
/**
* INTERNAL:
* Get the version of JDK being used from the Version class.
* @return JDKPlatform a platform appropriate for the version of JDK being used.
*/
protected 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("org.eclipse.persistence.internal.helper.JDK15Platform"));
} catch (PrivilegedActionException exception) {
}
} else {
platformClass = org.eclipse.persistence.internal.security.PrivilegedAccessHelper.getClassForName("org.eclipse.persistence.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 Boolean (TRUE, FALSE, null == unknown)
*/
public static Boolean conformLike(Object left, Object right) {
return getPlatform().conformLike(left, right);
}
/**
* INTERNAL:
* Get the Map to store the query cache in
*/
public static Map getConcurrentMap() {
return getPlatform().getConcurrentMap();
}
}