FileUtils.java
- /**
- *
- * Copyright the original author or authors
- *
- * Licensed 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.jivesoftware.smack.util;
- import java.io.BufferedReader;
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.FileNotFoundException;
- import java.io.FileOutputStream;
- import java.io.FileReader;
- import java.io.FileWriter;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.InputStreamReader;
- import java.io.Reader;
- import java.net.MalformedURLException;
- import java.net.URI;
- import java.net.URL;
- import java.nio.charset.StandardCharsets;
- import java.util.ArrayList;
- import java.util.List;
- import java.util.Set;
- import java.util.logging.Level;
- import java.util.logging.Logger;
- public final class FileUtils {
- private static final Logger LOGGER = Logger.getLogger(FileUtils.class.getName());
- public static InputStream getInputStreamForClasspathFile(String path) {
- return getInputStreamForClasspathFile(path, null);
- }
- public static InputStream getInputStreamForClasspathFile(String path, ClassLoader loader) {
- try {
- return getStreamForClasspathFile(path, loader);
- } catch (IOException e) {
- LOGGER.log(Level.FINE, "Suppressed IOException in getInputStreamForClasspathFile", e);
- return null;
- }
- }
- public static InputStream getStreamForClasspathFile(String path, ClassLoader loader) throws IOException {
- // Get an array of class loaders to try loading the providers files from.
- List<ClassLoader> classLoaders = getClassLoaders();
- if (loader != null) {
- classLoaders.add(0, loader);
- }
- for (ClassLoader classLoader : classLoaders) {
- InputStream is = classLoader.getResourceAsStream(path);
- if (is != null) {
- return is;
- }
- }
- throw new IOException("Unable to get '" + path + "' from classpath. Tried ClassLoaders:" + classLoaders);
- }
- public static InputStream getStreamForUri(URI uri, ClassLoader loader) throws IOException {
- String protocol = uri.getScheme();
- if (protocol.equals("classpath")) {
- String path = uri.getSchemeSpecificPart();
- return getStreamForClasspathFile(path, loader);
- }
- URL url = uri.toURL();
- return url.openStream();
- }
- /**
- * Returns default classloaders.
- *
- * @return a List of ClassLoader instances.
- */
- public static List<ClassLoader> getClassLoaders() {
- ClassLoader[] classLoaders = new ClassLoader[2];
- classLoaders[0] = FileUtils.class.getClassLoader();
- classLoaders[1] = Thread.currentThread().getContextClassLoader();
- // Clean up possible null values. Note that #getClassLoader may return a null value.
- List<ClassLoader> loaders = new ArrayList<ClassLoader>(classLoaders.length);
- for (ClassLoader classLoader : classLoaders) {
- if (classLoader != null) {
- loaders.add(classLoader);
- }
- }
- return loaders;
- }
- public static boolean addLines(String uriString, Set<String> set) throws MalformedURLException, IOException {
- URI uri = URI.create(uriString);
- InputStream is = getStreamForUri(uri, null);
- InputStreamReader sr = new InputStreamReader(is, StandardCharsets.UTF_8);
- BufferedReader br = new BufferedReader(sr);
- try {
- String line;
- while ((line = br.readLine()) != null) {
- set.add(line);
- }
- }
- finally {
- br.close();
- }
- return true;
- }
- /**
- * Reads the contents of a File.
- *
- * @param file TODO javadoc me please
- * @return the content of file or null in case of an error
- * @throws IOException if an I/O error occurred.
- */
- @SuppressWarnings("DefaultCharset")
- public static String readFileOrThrow(File file) throws IOException {
- try (Reader reader = new FileReader(file)) {
- char[] buf = new char[8192];
- int len;
- StringBuilder s = new StringBuilder();
- while ((len = reader.read(buf)) >= 0) {
- s.append(buf, 0, len);
- }
- return s.toString();
- }
- }
- public static String readFile(File file) {
- try {
- return readFileOrThrow(file);
- } catch (FileNotFoundException e) {
- LOGGER.log(Level.FINE, "readFile", e);
- } catch (IOException e) {
- LOGGER.log(Level.WARNING, "readFile", e);
- }
- return null;
- }
- @SuppressWarnings("DefaultCharset")
- public static void writeFileOrThrow(File file, CharSequence content) throws IOException {
- FileWriter writer = new FileWriter(file, false);
- try {
- writer.write(content.toString());
- } finally {
- writer.close();
- }
- }
- public static boolean writeFile(File file, CharSequence content) {
- try {
- writeFileOrThrow(file, content);
- return true;
- }
- catch (IOException e) {
- LOGGER.log(Level.WARNING, "writeFile", e);
- return false;
- }
- }
- public static FileOutputStream prepareFileOutputStream(File file) throws IOException {
- if (!file.exists()) {
- // Create parent directory
- File parent = file.getParentFile();
- if (!parent.exists() && !parent.mkdirs()) {
- throw new IOException("Cannot create directory " + parent.getAbsolutePath());
- }
- // Create file
- if (!file.createNewFile()) {
- throw new IOException("Cannot create file " + file.getAbsolutePath());
- }
- }
- if (file.isDirectory()) {
- throw new AssertionError("File " + file.getAbsolutePath() + " is not a file!");
- }
- return new FileOutputStream(file);
- }
- public static FileInputStream prepareFileInputStream(File file) throws IOException {
- if (file.exists()) {
- if (file.isFile()) {
- return new FileInputStream(file);
- } else {
- throw new IOException("File " + file.getAbsolutePath() + " is not a file!");
- }
- } else {
- throw new FileNotFoundException("File " + file.getAbsolutePath() + " not found.");
- }
- }
- public static void maybeDeleteFileOrThrow(File file) throws IOException {
- if (!file.exists()) {
- return;
- }
- boolean successfullyDeleted = file.delete();
- if (!successfullyDeleted) {
- throw new IOException("Could not delete file " + file);
- }
- }
- public static void maybeCreateFileWithParentDirectories(File file) throws IOException {
- File parent = file.getParentFile();
- if (!parent.exists() && !parent.mkdirs()) {
- throw new IOException("Cannot create directory " + parent);
- }
- if (file.isFile()) {
- return;
- }
- if (!file.exists()) {
- if (file.createNewFile()) {
- return;
- }
- throw new IOException("Cannot create file " + file);
- }
- if (file.isDirectory()) {
- throw new IOException("File " + file + " exists, but is a directory.");
- } else {
- throw new IOException("File " + file + " exists, but is neither a file nor a directory");
- }
- }
- }