aoqi@0: /*
aoqi@0:  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package com.sun.xml.internal.org.jvnet.mimepull;
aoqi@0: 
aoqi@0: import java.io.File;
aoqi@0: import java.io.IOException;
aoqi@0: import java.lang.reflect.Array;
aoqi@0: import java.lang.reflect.InvocationTargetException;
aoqi@0: import java.lang.reflect.Method;
aoqi@0: import java.util.logging.Level;
aoqi@0: import java.util.logging.Logger;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * Helper utility to support jdk <= jdk1.6. After jdk1.6 EOL reflection can be removed and API can be used directly.
aoqi@0:  */
aoqi@0: class TempFiles {
aoqi@0: 
aoqi@0:     private static final Logger LOGGER = Logger.getLogger(TempFiles.class.getName());
aoqi@0: 
aoqi@0:     private static final Class<?> CLASS_FILES;
aoqi@0:     private static final Class<?> CLASS_PATH;
aoqi@0:     private static final Class<?> CLASS_FILE_ATTRIBUTE;
aoqi@0:     private static final Class<?> CLASS_FILE_ATTRIBUTES;
aoqi@0:     private static final Method METHOD_FILE_TO_PATH;
aoqi@0:     private static final Method METHOD_FILES_CREATE_TEMP_FILE;
aoqi@0:     private static final Method METHOD_FILES_CREATE_TEMP_FILE_WITHPATH;
aoqi@0: 
aoqi@0:     private static final Method METHOD_PATH_TO_FILE;
aoqi@0: 
aoqi@0:     private static boolean useJdk6API;
aoqi@0: 
aoqi@0:     static {
aoqi@0:         useJdk6API = isJdk6();
aoqi@0: 
aoqi@0:         CLASS_FILES = safeGetClass("java.nio.file.Files");
aoqi@0:         CLASS_PATH = safeGetClass("java.nio.file.Path");
aoqi@0:         CLASS_FILE_ATTRIBUTE = safeGetClass("java.nio.file.attribute.FileAttribute");
aoqi@0:         CLASS_FILE_ATTRIBUTES = safeGetClass("[Ljava.nio.file.attribute.FileAttribute;");
aoqi@0:         METHOD_FILE_TO_PATH = safeGetMethod(File.class, "toPath");
aoqi@0:         METHOD_FILES_CREATE_TEMP_FILE = safeGetMethod(CLASS_FILES, "createTempFile", String.class, String.class, CLASS_FILE_ATTRIBUTES);
aoqi@0:         METHOD_FILES_CREATE_TEMP_FILE_WITHPATH = safeGetMethod(CLASS_FILES, "createTempFile", CLASS_PATH, String.class, String.class, CLASS_FILE_ATTRIBUTES);
aoqi@0:         METHOD_PATH_TO_FILE = safeGetMethod(CLASS_PATH, "toFile");
aoqi@0:     }
aoqi@0: 
aoqi@0:     private static boolean isJdk6() {
aoqi@0:         String javaVersion = System.getProperty("java.version");
aoqi@0:         LOGGER.log(Level.FINEST, "Detected java version = {0}", javaVersion);
aoqi@0:         return javaVersion.startsWith("1.6.");
aoqi@0:     }
aoqi@0: 
aoqi@0:     private static Class<?> safeGetClass(String className) {
aoqi@0:         // it is jdk 6 or something failed already before
aoqi@0:         if (useJdk6API) return null;
aoqi@0:         try {
aoqi@0:             return Class.forName(className);
aoqi@0:         } catch (ClassNotFoundException e) {
aoqi@0:             LOGGER.log(Level.SEVERE, "Exception cought", e);
aoqi@0:             LOGGER.log(Level.WARNING, "Class {0} not found. Temp files will be created using old java.io API.", className);
aoqi@0:             useJdk6API = true;
aoqi@0:             return null;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     private static Method safeGetMethod(Class<?> clazz, String methodName, Class<?>... parameterTypes) {
aoqi@0:         // it is jdk 6 or something failed already before
aoqi@0:         if (useJdk6API) return null;
aoqi@0:         try {
aoqi@0:             return clazz.getMethod(methodName, parameterTypes);
aoqi@0:         } catch (NoSuchMethodException e) {
aoqi@0:             LOGGER.log(Level.SEVERE, "Exception cought", e);
aoqi@0:             LOGGER.log(Level.WARNING, "Method {0} not found. Temp files will be created using old java.io API.", methodName);
aoqi@0:             useJdk6API = true;
aoqi@0:             return null;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0:     static Object toPath(File f) throws InvocationTargetException, IllegalAccessException {
aoqi@0:         return METHOD_FILE_TO_PATH.invoke(f);
aoqi@0:     }
aoqi@0: 
aoqi@0:     static File toFile(Object path) throws InvocationTargetException, IllegalAccessException {
aoqi@0:         return (File) METHOD_PATH_TO_FILE.invoke(path);
aoqi@0:     }
aoqi@0: 
aoqi@0:     static File createTempFile(String prefix, String suffix, File dir) throws IOException {
aoqi@0: 
aoqi@0:         if (useJdk6API) {
aoqi@0:             LOGGER.log(Level.FINEST, "Jdk6 detected, temp file (prefix:{0}, suffix:{1}) being created using old java.io API.", new Object[]{prefix, suffix});
aoqi@0:             return File.createTempFile(prefix, suffix, dir);
aoqi@0: 
aoqi@0:         } else {
aoqi@0: 
aoqi@0:             try {
aoqi@0:                 if (dir != null) {
aoqi@0:                     Object path = toPath(dir);
aoqi@0:                     LOGGER.log(Level.FINEST, "Temp file (path: {0}, prefix:{1}, suffix:{2}) being created using NIO API.", new Object[]{dir.getAbsolutePath(), prefix, suffix});
aoqi@0:                     return toFile(METHOD_FILES_CREATE_TEMP_FILE_WITHPATH.invoke(null, path, prefix, suffix, Array.newInstance(CLASS_FILE_ATTRIBUTE, 0)));
aoqi@0:                 } else {
aoqi@0:                     LOGGER.log(Level.FINEST, "Temp file (prefix:{0}, suffix:{1}) being created using NIO API.", new Object[]{prefix, suffix});
aoqi@0:                     return toFile(METHOD_FILES_CREATE_TEMP_FILE.invoke(null, prefix, suffix, Array.newInstance(CLASS_FILE_ATTRIBUTE, 0)));
aoqi@0:                 }
aoqi@0: 
aoqi@0:             } catch (IllegalAccessException e) {
aoqi@0:                 LOGGER.log(Level.SEVERE, "Exception caught", e);
aoqi@0:                 LOGGER.log(Level.WARNING, "Error invoking java.nio API, temp file (path: {0}, prefix:{1}, suffix:{2}) being created using old java.io API.",
aoqi@0:                         new Object[]{dir != null ? dir.getAbsolutePath() : null, prefix, suffix});
aoqi@0:                 return File.createTempFile(prefix, suffix, dir);
aoqi@0: 
aoqi@0:             } catch (InvocationTargetException e) {
aoqi@0:                 LOGGER.log(Level.SEVERE, "Exception caught", e);
aoqi@0:                 LOGGER.log(Level.WARNING, "Error invoking java.nio API, temp file (path: {0}, prefix:{1}, suffix:{2}) being created using old java.io API.",
aoqi@0:                         new Object[]{dir != null ? dir.getAbsolutePath() : null, prefix, suffix});
aoqi@0:                 return File.createTempFile(prefix, suffix, dir);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0: }