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Diffstat (limited to 'sca-java-1.x/tags/1.6-TUSCANY-3909/contribution-impl/src/main/java/org/apache/tuscany/sca/contribution/service/util/FileHelper.java')
| -rw-r--r-- | sca-java-1.x/tags/1.6-TUSCANY-3909/contribution-impl/src/main/java/org/apache/tuscany/sca/contribution/service/util/FileHelper.java | 701 |
1 files changed, 701 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/1.6-TUSCANY-3909/contribution-impl/src/main/java/org/apache/tuscany/sca/contribution/service/util/FileHelper.java b/sca-java-1.x/tags/1.6-TUSCANY-3909/contribution-impl/src/main/java/org/apache/tuscany/sca/contribution/service/util/FileHelper.java new file mode 100644 index 0000000000..cd5e87ca42 --- /dev/null +++ b/sca-java-1.x/tags/1.6-TUSCANY-3909/contribution-impl/src/main/java/org/apache/tuscany/sca/contribution/service/util/FileHelper.java @@ -0,0 +1,701 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +package org.apache.tuscany.sca.contribution.service.util; + +import java.io.File; +import java.io.FileFilter; +import java.io.FileInputStream; +import java.io.FileNotFoundException; +import java.io.FileOutputStream; +import java.io.IOException; +import java.net.URL; +import java.util.regex.Pattern; + +public class FileHelper { + /** + * The extension separator character. + */ + private static final char EXTENSION_SEPARATOR = '.'; + + /** + * The Unix separator character. + */ + private static final char UNIX_SEPARATOR = '/'; + + /** + * The Windows separator character. + */ + private static final char WINDOWS_SEPARATOR = '\\'; + + /** + * Returns the index of the last directory separator character. + * <p> + * This method will handle a file in either Unix or Windows format. The + * position of the last forward or backslash is returned. + * <p> + * The output will be the same irrespective of the machine that the code is + * running on. + * + * @param filename the filename to find the last path separator in, null + * returns -1 + * @return the index of the last separator character, or -1 if there is no + * such character + */ + public static int indexOfLastSeparator(String filename) { + if (filename == null) { + return -1; + } + int lastUnixPos = filename.lastIndexOf(UNIX_SEPARATOR); + int lastWindowsPos = filename.lastIndexOf(WINDOWS_SEPARATOR); + return Math.max(lastUnixPos, lastWindowsPos); + } + + /** + * Returns the index of the last extension separator character, which is a + * dot. + * <p> + * This method also checks that there is no directory separator after the + * last dot. To do this it uses {@link #indexOfLastSeparator(String)} which + * will handle a file in either Unix or Windows format. + * <p> + * The output will be the same irrespective of the machine that the code is + * running on. + * + * @param filename the filename to find the last path separator in, null + * returns -1 + * @return the index of the last separator character, or -1 if there is no + * such character + */ + public static int indexOfExtension(String filename) { + if (filename == null) { + return -1; + } + int extensionPos = filename.lastIndexOf(EXTENSION_SEPARATOR); + int lastSeparator = indexOfLastSeparator(filename); + return lastSeparator > extensionPos ? -1 : extensionPos; + } + + /** + * Gets the name minus the path from a full filename. + * <p> + * This method will handle a file in either Unix or Windows format. The text + * after the last forward or backslash is returned. + * + * <pre> + * a/b/c.txt --> c.txt + * a.txt --> a.txt + * a/b/c --> c + * a/b/c/ --> "" + * </pre> + * + * <p> + * The output will be the same irrespective of the machine that the code is + * running on. + * + * @param fileName the filename to query, null returns null + * @return the name of the file without the path, or an empty string if none + * exists + */ + public static String getName(String fileName) { + if (fileName == null) { + return null; + } + int index = indexOfLastSeparator(fileName); + return fileName.substring(index + 1); + } + + /** + * Gets the extension of a filename. + * <p> + * This method returns the textual part of the filename after the last dot. + * There must be no directory separator after the dot. + * + * <pre> + * foo.txt --> "txt" + * a/b/c.jpg --> "jpg" + * a/b.txt/c --> "" + * a/b/c --> "" + * </pre> + * + * <p> + * The output will be the same irrespective of the machine that the code is + * running on. + * + * @param filename the filename to retrieve the extension of. + * @return the extension of the file or an empty string if none exists. + */ + public static String getExtension(String filename) { + if (filename == null) { + return null; + } + int index = indexOfExtension(filename); + if (index == -1) { + return ""; + } else { + return filename.substring(index + 1); + } + } + + /** + * Make a directory, including any necessary but nonexistent parent + * directories. If there already exists a file with specified name or the + * directory cannot be created then an exception is thrown. + * + * @param directory directory to create, not null + * @throws NullPointerException if the directory is null + * @throws IOException if the directory cannot be created + */ + public static void forceMkdir(File directory) throws IOException { + if (directory.exists()) { + if (directory.isFile()) { + String message = + "File " + directory + " exists and is " + "not a directory. Unable to create directory."; + throw new IOException(message); + } + } else { + if (!directory.mkdirs()) { + String message = "Unable to create directory " + directory; + throw new IOException(message); + } + } + } + + /** + * Delete a file. If file is a directory, delete it and all sub-directories. + * <p> + * The difference between File.delete() and this method are: + * <ul> + * <li>A directory to be deleted does not have to be empty.</li> + * <li>You get exceptions when a file or directory cannot be deleted. + * (java.io.File methods returns a boolean)</li> + * </ul> + * + * @param file file or directory to delete, not null + * @throws NullPointerException if the directory is null + * @throws IOException in case deletion is unsuccessful + */ + public static void forceDelete(File file) throws IOException { + if (file.isDirectory()) { + deleteDirectory(file); + } else { + if (!file.exists()) { + throw new FileNotFoundException("File does not exist: " + file); + } + if (!file.delete()) { + String message = "Unable to delete file: " + file; + throw new IOException(message); + } + } + } + + /** + * Convert from a <code>URL</code> to a <code>File</code>. + * <p> + * From version 1.1 this method will decode the URL. Syntax such as + * <code>file:///my%20docs/file.txt</code> will be correctly decoded to + * <code>/my docs/file.txt</code>. + * + * @param url the file URL to convert, null returns null + * @return the equivalent <code>File</code> object, or <code>null</code> + * if the URL's protocol is not <code>file</code> + * @throws IllegalArgumentException if the file is incorrectly encoded + */ + public static File toFile(URL url) { + if (url == null || !url.getProtocol().equals("file")) { + return null; + } else { + String filename = url.getFile().replace('/', File.separatorChar); + int pos = 0; + while ((pos = filename.indexOf('%', pos)) >= 0) { // NOPMD + if (pos + 2 < filename.length()) { + String hexStr = filename.substring(pos + 1, pos + 3); + char ch = (char)Integer.parseInt(hexStr, 16); + filename = filename.substring(0, pos) + ch + filename.substring(pos + 3); + } + } + return new File(filename); + } + } + + public static FileFilter getFileFilter(String regExp, boolean ignoreCase) { + return new RegExpFilter(regExp, ignoreCase); + } + + /** + * A regular-expression based resource filter + */ + public static class RegExpFilter implements FileFilter { + private Pattern pattern; + + public RegExpFilter(Pattern pattern) { + this.pattern = pattern; + } + + public RegExpFilter(String patternStr, boolean ignoreCase) { + this.pattern = Pattern.compile(patternStr, ignoreCase ? Pattern.CASE_INSENSITIVE : 0); + } + + public boolean accept(File file) { + return pattern.matcher(file.getName()).matches(); + } + + /** + * Convert wildcard into a regex pattern + * + * @param str + * @return + */ + public static RegExpFilter getWildcardFilter(String str, boolean ignoreCase) { + StringBuffer buffer = new StringBuffer(); + for (int i = 0; i < str.length(); i++) { + char ch = str.charAt(i); + if (ch == '?') { + buffer.append('.'); + } else if (ch == '*') { + buffer.append(".*"); + } else { + buffer.append(ch); + } + } + return new RegExpFilter(buffer.toString(), ignoreCase); + } + + } + + /** + * Clean a directory without deleting it. + * + * @param directory directory to clean + * @throws IOException in case cleaning is unsuccessful + */ + public static void cleanDirectory(File directory) throws IOException { + if (!directory.exists()) { + String message = directory + " does not exist"; + throw new IllegalArgumentException(message); + } + + if (!directory.isDirectory()) { + String message = directory + " is not a directory"; + throw new IllegalArgumentException(message); + } + + File[] files = directory.listFiles(); + if (files == null) { // null if security restricted + throw new IOException("Failed to list contents of " + directory); + } + + IOException exception = null; + for (int i = 0; i < files.length; i++) { + File file = files[i]; + try { + forceDelete(file); + } catch (IOException ioe) { + exception = ioe; + } + } + + if (null != exception) { + throw exception; + } + } + + /** + * Clean a directory without deleting it. + * + * @param directory directory to clean, must not be <code>null</code> + * @throws NullPointerException if the directory is <code>null</code> + * @throws IOException in case cleaning is unsuccessful + */ + private static void cleanDirectoryOnExit(File directory) throws IOException { + if (!directory.exists()) { + String message = directory + " does not exist"; + throw new IllegalArgumentException(message); + } + + if (!directory.isDirectory()) { + String message = directory + " is not a directory"; + throw new IllegalArgumentException(message); + } + + File[] files = directory.listFiles(); + if (files == null) { // null if security restricted + throw new IOException("Failed to list contents of " + directory); + } + + IOException exception = null; + for (int i = 0; i < files.length; i++) { + File file = files[i]; + try { + forceDeleteOnExit(file); + } catch (IOException ioe) { + exception = ioe; + } + } + + if (null != exception) { + throw exception; + } + } + + /** + * Copies a whole directory to a new location preserving the file dates. + * <p> + * This method copies the specified directory and all its child directories + * and files to the specified destination. The destination is the new + * location and name of the directory. + * <p> + * The destination directory is created if it does not exist. If the + * destination directory did exist, then this method merges the source with + * the destination, with the source taking precedence. + * + * @param srcDir an existing directory to copy, must not be + * <code>null</code> + * @param destDir the new directory, must not be <code>null</code> + * @throws NullPointerException if source or destination is + * <code>null</code> + * @throws IOException if source or destination is invalid + * @throws IOException if an IO error occurs during copying + * @since Commons IO 1.1 + */ + public static void copyDirectory(File srcDir, File destDir) throws IOException { + copyDirectory(srcDir, destDir, true); + } + + /** + * Copies a whole directory to a new location. + * <p> + * This method copies the contents of the specified source directory to + * within the specified destination directory. + * <p> + * The destination directory is created if it does not exist. If the + * destination directory did exist, then this method merges the source with + * the destination, with the source taking precedence. + * + * @param srcDir an existing directory to copy, must not be + * <code>null</code> + * @param destDir the new directory, must not be <code>null</code> + * @param preserveFileDate true if the file date of the copy should be the + * same as the original + * @throws NullPointerException if source or destination is + * <code>null</code> + * @throws IOException if source or destination is invalid + * @throws IOException if an IO error occurs during copying + * @since Commons IO 1.1 + */ + public static void copyDirectory(File srcDir, File destDir, boolean preserveFileDate) throws IOException { + if (srcDir == null) { + throw new NullPointerException("Source must not be null"); + } + if (destDir == null) { + throw new NullPointerException("Destination must not be null"); + } + if (!srcDir.exists()) { + throw new FileNotFoundException("Source '" + srcDir + "' does not exist"); + } + if (!srcDir.isDirectory()) { + throw new IOException("Source '" + srcDir + "' exists but is not a directory"); + } + if (srcDir.getCanonicalPath().equals(destDir.getCanonicalPath())) { + throw new IOException("Source '" + srcDir + "' and destination '" + destDir + "' are the same"); + } + doCopyDirectory(srcDir, destDir, preserveFileDate); + } + + // ----------------------------------------------------------------------- + /** + * Copies a directory to within another directory preserving the file dates. + * <p> + * This method copies the source directory and all its contents to a + * directory of the same name in the specified destination directory. + * <p> + * The destination directory is created if it does not exist. If the + * destination directory did exist, then this method merges the source with + * the destination, with the source taking precedence. + * + * @param srcDir an existing directory to copy, must not be + * <code>null</code> + * @param destDir the directory to place the copy in, must not be + * <code>null</code> + * @throws NullPointerException if source or destination is + * <code>null</code> + * @throws IOException if source or destination is invalid + * @throws IOException if an IO error occurs during copying + * @since Commons IO 1.2 + */ + public static void copyDirectoryToDirectory(File srcDir, File destDir) throws IOException { + if (srcDir == null) { + throw new NullPointerException("Source must not be null"); + } + if (!(srcDir.exists() && srcDir.isDirectory())) { + throw new IllegalArgumentException("Source '" + destDir + "' is not a directory"); + } + if (destDir == null) { + throw new NullPointerException("Destination must not be null"); + } + if (!(destDir.exists() && destDir.isDirectory())) { + throw new IllegalArgumentException("Destination '" + destDir + "' is not a directory"); + } + copyDirectory(srcDir, new File(destDir, srcDir.getName()), true); + } + + /** + * Copies a file to a new location preserving the file date. + * <p> + * This method copies the contents of the specified source file to the + * specified destination file. The directory holding the destination file is + * created if it does not exist. If the destination file exists, then this + * method will overwrite it. + * + * @param srcFile an existing file to copy, must not be <code>null</code> + * @param destFile the new file, must not be <code>null</code> + * @throws NullPointerException if source or destination is + * <code>null</code> + * @throws IOException if source or destination is invalid + * @throws IOException if an IO error occurs during copying + * @see #copyFileToDirectory(File, File) + */ + public static void copyFile(File srcFile, File destFile) throws IOException { + copyFile(srcFile, destFile, true); + } + + /** + * Copies a file to a new location. + * <p> + * This method copies the contents of the specified source file to the + * specified destination file. The directory holding the destination file is + * created if it does not exist. If the destination file exists, then this + * method will overwrite it. + * + * @param srcFile an existing file to copy, must not be <code>null</code> + * @param destFile the new file, must not be <code>null</code> + * @param preserveFileDate true if the file date of the copy should be the + * same as the original + * @throws NullPointerException if source or destination is + * <code>null</code> + * @throws IOException if source or destination is invalid + * @throws IOException if an IO error occurs during copying + * @see #copyFileToDirectory(File, File, boolean) + */ + public static void copyFile(File srcFile, File destFile, boolean preserveFileDate) throws IOException { + if (srcFile == null) { + throw new NullPointerException("Source must not be null"); + } + if (destFile == null) { + throw new NullPointerException("Destination must not be null"); + } + if (!srcFile.exists()) { + throw new FileNotFoundException("Source '" + srcFile + "' does not exist"); + } + if (srcFile.isDirectory()) { + throw new IOException("Source '" + srcFile + "' exists but is a directory"); + } + if (srcFile.getCanonicalPath().equals(destFile.getCanonicalPath())) { + throw new IOException("Source '" + srcFile + "' and destination '" + destFile + "' are the same"); + } + if (!(destFile.getParentFile() != null && destFile.getParentFile().exists())) { + if (!destFile.getParentFile().mkdirs()) { //NOPMD + throw new IOException("Destination '" + destFile + "' directory cannot be created"); + } + } + if (!(destFile.exists() && destFile.canWrite())) { + throw new IOException("Destination '" + destFile + "' exists but is read-only"); + } + doCopyFile(srcFile, destFile, preserveFileDate); + } + + // ----------------------------------------------------------------------- + /** + * Copies a file to a directory preserving the file date. + * <p> + * This method copies the contents of the specified source file to a file of + * the same name in the specified destination directory. The destination + * directory is created if it does not exist. If the destination file + * exists, then this method will overwrite it. + * + * @param srcFile an existing file to copy, must not be <code>null</code> + * @param destDir the directory to place the copy in, must not be + * <code>null</code> + * @throws NullPointerException if source or destination is null + * @throws IOException if source or destination is invalid + * @throws IOException if an IO error occurs during copying + * @see #copyFile(File, File, boolean) + */ + public static void copyFileToDirectory(File srcFile, File destDir) throws IOException { + copyFileToDirectory(srcFile, destDir, true); + } + + /** + * Copies a file to a directory optionally preserving the file date. + * <p> + * This method copies the contents of the specified source file to a file of + * the same name in the specified destination directory. The destination + * directory is created if it does not exist. If the destination file + * exists, then this method will overwrite it. + * + * @param srcFile an existing file to copy, must not be <code>null</code> + * @param destDir the directory to place the copy in, must not be + * <code>null</code> + * @param preserveFileDate true if the file date of the copy should be the + * same as the original + * @throws NullPointerException if source or destination is + * <code>null</code> + * @throws IOException if source or destination is invalid + * @throws IOException if an IO error occurs during copying + * @see #copyFile(File, File, boolean) + * @since Commons IO 1.3 + */ + public static void copyFileToDirectory(File srcFile, File destDir, boolean preserveFileDate) throws IOException { + if (destDir == null) { + throw new NullPointerException("Destination must not be null"); + } + if (!(destDir.exists() && destDir.isDirectory())) { + throw new IllegalArgumentException("Destination '" + destDir + "' is not a directory"); + } + copyFile(srcFile, new File(destDir, srcFile.getName()), preserveFileDate); + } + + // ----------------------------------------------------------------------- + /** + * Recursively delete a directory. + * + * @param directory directory to delete + * @throws IOException in case deletion is unsuccessful + */ + public static void deleteDirectory(File directory) throws IOException { + if (!directory.exists()) { + return; + } + + cleanDirectory(directory); + if (!directory.delete()) { + String message = "Unable to delete directory " + directory + "."; + throw new IOException(message); + } + } + + /** + * Recursively schedule directory for deletion on JVM exit. + * + * @param directory directory to delete, must not be <code>null</code> + * @throws NullPointerException if the directory is <code>null</code> + * @throws IOException in case deletion is unsuccessful + */ + private static void deleteDirectoryOnExit(File directory) throws IOException { + if (!directory.exists()) { + return; + } + + cleanDirectoryOnExit(directory); + directory.deleteOnExit(); + } + + /** + * Internal copy directory method. + * + * @param srcDir the validated source directory, must not be + * <code>null</code> + * @param destDir the validated destination directory, must not be + * <code>null</code> + * @param preserveFileDate whether to preserve the file date + * @throws IOException if an error occurs + * @since Commons IO 1.1 + */ + private static void doCopyDirectory(File srcDir, File destDir, boolean preserveFileDate) throws IOException { + if (destDir.exists()) { + if (!destDir.isDirectory()) { + throw new IOException("Destination '" + destDir + "' exists but is not a directory"); + } + } else { + if (!destDir.mkdirs()) { + throw new IOException("Destination '" + destDir + "' directory cannot be created"); + } + if (preserveFileDate) { + destDir.setLastModified(srcDir.lastModified()); + } + } + if (!destDir.canWrite()) { + throw new IOException("Destination '" + destDir + "' cannot be written to"); + } + // recurse + File[] files = srcDir.listFiles(); + if (files == null) { // null if security restricted + throw new IOException("Failed to list contents of " + srcDir); + } + for (int i = 0; i < files.length; i++) { + File copiedFile = new File(destDir, files[i].getName()); + if (files[i].isDirectory()) { + doCopyDirectory(files[i], copiedFile, preserveFileDate); + } else { + doCopyFile(files[i], copiedFile, preserveFileDate); + } + } + } + + /** + * Internal copy file method. + * + * @param srcFile the validated source file, must not be <code>null</code> + * @param destFile the validated destination file, must not be + * <code>null</code> + * @param preserveFileDate whether to preserve the file date + * @throws IOException if an error occurs + */ + private static void doCopyFile(File srcFile, File destFile, boolean preserveFileDate) throws IOException { + if (destFile.exists() && destFile.isDirectory()) { + throw new IOException("Destination '" + destFile + "' exists but is a directory"); + } + + FileInputStream input = new FileInputStream(srcFile); + try { + FileOutputStream output = new FileOutputStream(destFile); + try { + IOHelper.copy(input, output); + } finally { + IOHelper.closeQuietly(output); + } + } finally { + IOHelper.closeQuietly(input); + } + + if (srcFile.length() != destFile.length()) { + throw new IOException("Failed to copy full contents from '" + srcFile + "' to '" + destFile + "'"); + } + if (preserveFileDate) { + destFile.setLastModified(srcFile.lastModified()); + } + } + + /** + * Schedule a file to be deleted when JVM exits. If file is directory delete + * it and all sub-directories. + * + * @param file file or directory to delete, must not be <code>null</code> + * @throws NullPointerException if the file is <code>null</code> + * @throws IOException in case deletion is unsuccessful + */ + public static void forceDeleteOnExit(File file) throws IOException { + if (file.isDirectory()) { + deleteDirectoryOnExit(file); + } else { + file.deleteOnExit(); + } + } + +} |