package eu.svjatoslav.commons.file;
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.UnsupportedEncodingException;
+import java.io.*;
public class IOHelper {
- /**
- * Deletes files and directories recursively. WARNING!!! Follows symlinks!!!
- *
- * @param file
- * directory to delete with entire contents.
- *
- * @throws IOException
- * if filesystem error happens
- */
- public static void deleteRecursively(final File file) throws IOException {
- if (file.isDirectory()) {
-
- for (final File subFile : file.listFiles())
- deleteRecursively(subFile);
-
- if (!file.delete())
- throw new FileNotFoundException("Failed to delete directory: "
- + file);
-
- return;
- }
-
- if (file.isFile())
- if (!file.delete())
- throw new FileNotFoundException("Failed to delete file: "
- + file);
- }
-
- public static byte[] getFileContents(final File file)
- throws FileNotFoundException, IOException {
-
- final byte[] result = new byte[(int) file.length()];
- final FileInputStream fileInputStream = new FileInputStream(file);
- fileInputStream.read(result);
- fileInputStream.close();
- return result;
- }
-
- public static String getFileContentsAsString(final File file)
- throws FileNotFoundException, IOException {
- try {
- return new String(getFileContents(file), "UTF-8");
- } catch (final UnsupportedEncodingException exception) {
- throw new RuntimeException(exception);
- }
- }
-
- /**
- * Compares new file content with old file content. If content in equal,
- * then leaves file as-is. If content differs, then overrides file with the
- * new content.
- *
- * @param file
- * file to potentially overwrite
- * @param newContent
- * new content
- * @return <code>true</code> if file was overwritten.
- *
- * @throws FileNotFoundException
- * if file is not found.
- * @throws IOException
- * if error happens during file IO.
- */
- public static boolean overwriteFileIfContentDiffers(final File file,
- final byte[] newContent) throws FileNotFoundException, IOException {
-
- checkForEquality: {
- if (file.length() == newContent.length) {
-
- final byte[] oldContent = getFileContents(file);
-
- for (int i = 0; i < newContent.length; i++)
- if (newContent[i] != oldContent[i])
- break checkForEquality;
-
- // new file content in identical to old content
- return false;
- }
- }
-
- // New content differs from existing. Overwrite file.
- saveToFile(file, newContent);
- return true;
- }
-
- public static void saveToFile(final File file, final byte[] content)
- throws IOException {
- final FileOutputStream fos = new FileOutputStream(file);
- fos.write(content);
- fos.close();
- }
+ /**
+ * Deletes files and directories recursively. WARNING!!! Follows symlinks!!!
+ *
+ * @param file directory to delete with entire contents.
+ * @throws IOException if filesystem error happens
+ */
+ public static void deleteRecursively(final File file) throws IOException {
+ if (file.isDirectory()) {
+
+ File[] files = file.listFiles();
+ if (files == null)
+ throw new RuntimeException("Failed to read directory content for: "
+ + file);
+
+ for (final File subFile : files)
+ deleteRecursively(subFile);
+
+ if (!file.delete())
+ throw new RuntimeException("Failed to delete directory: "
+ + file);
+
+ return;
+ }
+
+ if (file.isFile())
+ if (!file.delete())
+ throw new FileNotFoundException("Failed to delete file: "
+ + file);
+ }
+
+ public static byte[] getFileContents(final File file)
+ throws IOException {
+
+ final byte[] result = new byte[(int) file.length()];
+ try (final FileInputStream fileInputStream = new FileInputStream(file)) {
+ if (fileInputStream.read(result) != result.length)
+ throw new RuntimeException("Could not read file content:" + file);
+ }
+ return result;
+ }
+
+ public static String getFileContentsAsString(final File file)
+ throws IOException {
+ try {
+ return new String(getFileContents(file), "UTF-8");
+ } catch (final UnsupportedEncodingException exception) {
+ throw new RuntimeException(exception);
+ }
+ }
+
+ /**
+ * Compares new file content with old file content. If content in equal,
+ * then leaves file as-is. If content differs, then overrides file with the
+ * new content.
+ *
+ * @param file file to potentially overwrite
+ * @param newContent new content
+ * @return <code>true</code> if file was overwritten.
+ * @throws FileNotFoundException if file is not found.
+ * @throws IOException if error happens during file IO.
+ */
+ public static boolean overwriteFileIfContentDiffers(final File file,
+ final byte[] newContent) throws IOException {
+
+ checkForEquality:
+ {
+ if (file.length() == newContent.length) {
+
+ final byte[] oldContent = getFileContents(file);
+
+ for (int i = 0; i < newContent.length; i++)
+ if (newContent[i] != oldContent[i])
+ break checkForEquality;
+
+ // new file content in identical to old content
+ return false;
+ }
+ }
+
+ // New content differs from existing. Overwrite file.
+ saveToFile(file, newContent);
+ return true;
+ }
+
+ public static void saveToFile(final File file, final byte[] content)
+ throws IOException {
+ try (final FileOutputStream fos = new FileOutputStream(file)) {
+ fos.write(content);
+ }
+ }
}
projects / svjatoslav_commons.git / blobdiff