package be.nikiroo.utils;
import java.io.BufferedReader;
+import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
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.OutputStream;
+import java.util.ArrayList;
+import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
* in case of I/O error
*/
public static String readSmallFile(File file) throws IOException {
- BufferedReader reader = new BufferedReader(new FileReader(file));
+ InputStream stream = new FileInputStream(file);
try {
- StringBuilder builder = new StringBuilder();
- for (String line = reader.readLine(); line != null; line = reader
- .readLine()) {
- builder.append(line);
- }
- return builder.toString();
+ return readSmallStream(stream);
} finally {
- reader.close();
+ stream.close();
+ }
+ }
+
+ /**
+ * Read the whole {@link InputStream} content into a {@link String}.
+ *
+ * @param stream
+ * the {@link InputStream}
+ *
+ * @return the content
+ *
+ * @throws IOException
+ * in case of I/O error
+ */
+ public static String readSmallStream(InputStream stream) throws IOException {
+ // do NOT close the reader, or the related stream will be closed, too
+ // reader.close();
+ BufferedReader reader = new BufferedReader(
+ new InputStreamReader(stream));
+
+ StringBuilder builder = new StringBuilder();
+ for (String line = reader.readLine(); line != null; line = reader
+ .readLine()) {
+ builder.append(line);
+ builder.append("\n");
+ }
+
+ return builder.toString();
+ }
+
+ /**
+ * Recursively delete the given {@link File}, which may of course also be a
+ * directory.
+ * <p>
+ * Will either silently continue or throw an exception in case of error,
+ * depending upon the parameters.
+ *
+ * @param target
+ * the target to delete
+ * @param exception
+ * TRUE to throw an {@link IOException} in case of error, FALSE
+ * to silently continue
+ *
+ * @return TRUE if all files were deleted, FALSE if an error occurred
+ *
+ * @throws IOException
+ * if an error occurred and the parameters allow an exception to
+ * be thrown
+ */
+ public static boolean deltree(File target, boolean exception)
+ throws IOException {
+ List<File> list = deltree(target, null);
+ if (exception && !list.isEmpty()) {
+ String slist = "";
+ for (File file : list) {
+ slist += "\n" + file.getPath();
+ }
+
+ throw new IOException("Cannot delete all the files from: <" //
+ + target + ">:" + slist);
}
+
+ return list.isEmpty();
}
/**
*
* @param target
* the target to delete
+ *
+ * @return TRUE if all files were deleted, FALSE if an error occurred
*/
- public static void deltree(File target) {
+ public static boolean deltree(File target) {
+ return deltree(target, null).isEmpty();
+ }
+
+ /**
+ * Recursively delete the given {@link File}, which may of course also be a
+ * directory.
+ * <p>
+ * Will collect all {@link File} that cannot be deleted in the given
+ * accumulator.
+ *
+ * @param target
+ * the target to delete
+ * @param errorAcc
+ * the accumulator to use for errors, or NULL to create a new one
+ *
+ * @return the errors accumulator
+ */
+ public static List<File> deltree(File target, List<File> errorAcc) {
+ if (errorAcc == null) {
+ errorAcc = new ArrayList<File>();
+ }
+
File[] files = target.listFiles();
if (files != null) {
for (File file : files) {
- deltree(file);
+ errorAcc = deltree(file, errorAcc);
}
}
if (!target.delete()) {
- System.err.println("Cannot delete: " + target.getAbsolutePath());
+ errorAcc.add(target);
}
+
+ return errorAcc;
}
/**
return loader.getResourceAsStream(name);
}
+
+ /**
+ * Return a resetable {@link InputStream} from this stream, and reset it.
+ *
+ * @param in
+ * the input stream
+ * @return the resetable stream, which <b>may</b> be the same
+ *
+ * @throws IOException
+ * in case of I/O error
+ */
+ public static InputStream forceResetableStream(InputStream in)
+ throws IOException {
+ MarkableFileInputStream tmpIn = null;
+ File tmp = null;
+
+ boolean resetable = in.markSupported();
+ if (resetable) {
+ try {
+ in.reset();
+ } catch (IOException e) {
+ resetable = false;
+ }
+ }
+
+ if (resetable) {
+ return in;
+ }
+
+ tmp = File.createTempFile(".tmp-stream", ".tmp");
+ try {
+ write(in, tmp);
+ tmpIn = new MarkableFileInputStream(new FileInputStream(tmp));
+ return tmpIn;
+ } finally {
+ try {
+ if (tmpIn != null) {
+ tmpIn.close();
+ }
+ } finally {
+ tmp.delete();
+ }
+ }
+ }
+
+ /**
+ * Convert the {@link InputStream} into a byte array.
+ *
+ * @param in
+ * the input stream
+ *
+ * @return the array
+ *
+ * @throws IOException
+ * in case of I/O error
+ */
+ public static byte[] toByteArray(InputStream in) throws IOException {
+ ByteArrayOutputStream out = new ByteArrayOutputStream();
+ write(in, out);
+
+ byte[] array = out.toByteArray();
+ out.close();
+
+ return array;
+ }
}
git://git.nikiroo.be / nikiroo-utils.git / blobdiff