org.glassfish.jersey.message.internal.Utils Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jersey-common Show documentation
Show all versions of jersey-common Show documentation
Jersey core common packages
/*
* Copyright (c) 2012, 2021 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.jersey.message.internal;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.concurrent.atomic.AtomicReference;
/**
* Utility class.
*
* @author Jakub Podlesak
*/
public final class Utils {
/**
* Throws an IllegalArgumentException with given error message if the first, toCheck,
* parameter is {@code null}.
*
* @param toCheck an instance to check.
* @param errorMessage message to set to the IllegalArgumentException thrown.
*/
static void throwIllegalArgumentExceptionIfNull(final Object toCheck, final String errorMessage) {
if (toCheck == null) {
throw new IllegalArgumentException(errorMessage);
}
}
/**
* Create an empty file in the default temporary-file directory.
*
* @return An abstract pathname denoting a newly-created empty file.
* @throws IOException if a file could not be created.
*/
public static File createTempFile() throws IOException {
final AtomicReference exceptionReference = new AtomicReference<>();
final File file = AccessController.doPrivileged(new PrivilegedAction() {
public File run() {
File tempFile = null;
try {
tempFile = Files.createTempFile("rep", "tmp").toFile();
// Make sure the file is deleted when JVM is shutdown at last.
tempFile.deleteOnExit();
} catch (IOException e) {
exceptionReference.set(e);
}
return tempFile;
}
});
if (exceptionReference.get() != null) {
throw exceptionReference.get();
}
return file;
}
/**
* Prevent instantiation.
*/
private Utils() {
throw new AssertionError("No instances allowed.");
}
}