/*
* Copyright (c) 2013, 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
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package com.sun.xml.internal.org.jvnet.mimepull;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Helper utility to support jdk <= jdk1.6. After jdk1.6 EOL reflection can be removed and API can be used directly.
*/
class TempFiles {
private static final Logger LOGGER = Logger.getLogger(TempFiles.class.getName());
private static final Class<?> CLASS_FILES;
private static final Class<?> CLASS_PATH;
private static final Class<?> CLASS_FILE_ATTRIBUTE;
private static final Class<?> CLASS_FILE_ATTRIBUTES;
private static final Method METHOD_FILE_TO_PATH;
private static final Method METHOD_FILES_CREATE_TEMP_FILE;
private static final Method METHOD_FILES_CREATE_TEMP_FILE_WITHPATH;
private static final Method METHOD_PATH_TO_FILE;
private static boolean useJdk6API;
static {
useJdk6API = isJdk6();
CLASS_FILES = safeGetClass("java.nio.file.Files");
CLASS_PATH = safeGetClass("java.nio.file.Path");
CLASS_FILE_ATTRIBUTE = safeGetClass("java.nio.file.attribute.FileAttribute");
CLASS_FILE_ATTRIBUTES = safeGetClass("[Ljava.nio.file.attribute.FileAttribute;");
METHOD_FILE_TO_PATH = safeGetMethod(File.class, "toPath");
METHOD_FILES_CREATE_TEMP_FILE = safeGetMethod(CLASS_FILES, "createTempFile", String.class, String.class, CLASS_FILE_ATTRIBUTES);
METHOD_FILES_CREATE_TEMP_FILE_WITHPATH = safeGetMethod(CLASS_FILES, "createTempFile", CLASS_PATH, String.class, String.class, CLASS_FILE_ATTRIBUTES);
METHOD_PATH_TO_FILE = safeGetMethod(CLASS_PATH, "toFile");
}
private static boolean isJdk6() {
String javaVersion = System.getProperty("java.version");
LOGGER.log(Level.FINEST, "Detected java version = {0}", javaVersion);
return javaVersion.startsWith("1.6.");
}
private static Class<?> safeGetClass(String className) {
// it is jdk 6 or something failed already before
if (useJdk6API) return null;
try {
return Class.forName(className);
} catch (ClassNotFoundException e) {
LOGGER.log(Level.SEVERE, "Exception cought", e);
LOGGER.log(Level.WARNING, "Class {0} not found. Temp files will be created using old java.io API.", className);
useJdk6API = true;
return null;
}
}
private static Method safeGetMethod(Class<?> clazz, String methodName, Class<?>... parameterTypes) {
// it is jdk 6 or something failed already before
if (useJdk6API) return null;
try {
return clazz.getMethod(methodName, parameterTypes);
} catch (NoSuchMethodException e) {
LOGGER.log(Level.SEVERE, "Exception cought", e);
LOGGER.log(Level.WARNING, "Method {0} not found. Temp files will be created using old java.io API.", methodName);
useJdk6API = true;
return null;
}
}
static Object toPath(File f) throws InvocationTargetException, IllegalAccessException {
return METHOD_FILE_TO_PATH.invoke(f);
}
static File toFile(Object path) throws InvocationTargetException, IllegalAccessException {
return (File) METHOD_PATH_TO_FILE.invoke(path);
}
static File createTempFile(String prefix, String suffix, File dir) throws IOException {
if (useJdk6API) {
LOGGER.log(Level.FINEST, "Jdk6 detected, temp file (prefix:{0}, suffix:{1}) being created using old java.io API.", new Object[]{prefix, suffix});
return File.createTempFile(prefix, suffix, dir);
} else {
try {
if (dir != null) {
Object path = toPath(dir);
LOGGER.log(Level.FINEST, "Temp file (path: {0}, prefix:{1}, suffix:{2}) being created using NIO API.", new Object[]{dir.getAbsolutePath(), prefix, suffix});
return toFile(METHOD_FILES_CREATE_TEMP_FILE_WITHPATH.invoke(null, path, prefix, suffix, Array.newInstance(CLASS_FILE_ATTRIBUTE, 0)));
} else {
LOGGER.log(Level.FINEST, "Temp file (prefix:{0}, suffix:{1}) being created using NIO API.", new Object[]{prefix, suffix});
return toFile(METHOD_FILES_CREATE_TEMP_FILE.invoke(null, prefix, suffix, Array.newInstance(CLASS_FILE_ATTRIBUTE, 0)));
}
} catch (IllegalAccessException e) {
LOGGER.log(Level.SEVERE, "Exception caught", e);
LOGGER.log(Level.WARNING, "Error invoking java.nio API, temp file (path: {0}, prefix:{1}, suffix:{2}) being created using old java.io API.",
new Object[]{dir != null ? dir.getAbsolutePath() : null, prefix, suffix});
return File.createTempFile(prefix, suffix, dir);
} catch (InvocationTargetException e) {
LOGGER.log(Level.SEVERE, "Exception caught", e);
LOGGER.log(Level.WARNING, "Error invoking java.nio API, temp file (path: {0}, prefix:{1}, suffix:{2}) being created using old java.io API.",
new Object[]{dir != null ? dir.getAbsolutePath() : null, prefix, suffix});
return File.createTempFile(prefix, suffix, dir);
}
}
}
}