X-Git-Url: http://git.nikiroo.be/?a=blobdiff_plain;f=src%2Fbe%2Fnikiroo%2Futils%2FIOUtils.java;h=5a7e179b684d9423182c048376f2bf014c54077b;hb=8e76f6ab13a8a4a651f2518b6c91d5e6424c7922;hp=83dcd502b242fb26d88b611b1d7ff4e7d1a30c17;hpb=b771aed5070864bbcbae286c8de74478f6837618;p=nikiroo-utils.git

diff --git a/src/be/nikiroo/utils/IOUtils.java b/src/be/nikiroo/utils/IOUtils.java
index 83dcd50..5a7e179 100644
--- a/src/be/nikiroo/utils/IOUtils.java
+++ b/src/be/nikiroo/utils/IOUtils.java
@@ -1,19 +1,22 @@
 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.OutputStream;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
 import java.util.zip.ZipOutputStream;
 
+import be.nikiroo.utils.streams.MarkableFileInputStream;
+
 /**
- * This class offer some utilities based around Streams.
+ * This class offer some utilities based around Streams and Files.
  * 
  * @author niki
  */
@@ -51,9 +54,11 @@ public class IOUtils {
 	 */
 	public static void write(InputStream in, OutputStream out)
 			throws IOException {
-		byte buffer[] = new byte[4069];
-		for (int len = 0; (len = in.read(buffer)) > 0;) {
+		byte buffer[] = new byte[4096];
+		int len = in.read(buffer);
+		while (len > 0) {
 			out.write(buffer, 0, len);
+			len = in.read(buffer);
 		}
 	}
 
@@ -86,8 +91,12 @@ public class IOUtils {
 				}
 				zip.putNextEntry(new ZipEntry(base + "/"));
 			}
-			for (File file : target.listFiles()) {
-				zip(zip, base, file, false);
+
+			File[] files = target.listFiles();
+			if (files != null) {
+				for (File file : files) {
+					zip(zip, base, file, false);
+				}
 			}
 		} else {
 			if (base == null || base.isEmpty()) {
@@ -134,6 +143,58 @@ public class IOUtils {
 		}
 	}
 
+	/**
+	 * Unzip the given ZIP file into the target directory.
+	 * 
+	 * @param zipFile
+	 *            the ZIP file
+	 * @param targetDirectory
+	 *            the target directory
+	 * 
+	 * @return the number of extracted files (not directories)
+	 * 
+	 * @throws IOException
+	 *             in case of I/O errors
+	 */
+	public static long unzip(File zipFile, File targetDirectory)
+			throws IOException {
+		long count = 0;
+
+		if (targetDirectory.exists() && targetDirectory.isFile()) {
+			throw new IOException("Cannot unzip " + zipFile + " into "
+					+ targetDirectory + ": it is not a directory");
+		}
+
+		targetDirectory.mkdir();
+		if (!targetDirectory.exists()) {
+			throw new IOException("Cannot create target directory "
+					+ targetDirectory);
+		}
+
+		FileInputStream in = new FileInputStream(zipFile);
+		try {
+			ZipInputStream zipStream = new ZipInputStream(in);
+			try {
+				for (ZipEntry entry = zipStream.getNextEntry(); entry != null; entry = zipStream
+						.getNextEntry()) {
+					File file = new File(targetDirectory, entry.getName());
+					if (entry.isDirectory()) {
+						file.mkdirs();
+					} else {
+						IOUtils.write(zipStream, file);
+						count++;
+					}
+				}
+			} finally {
+				zipStream.close();
+			}
+		} finally {
+			in.close();
+		}
+
+		return count;
+	}
+
 	/**
 	 * Write the {@link String} content to {@link File}.
 	 * 
@@ -153,11 +214,27 @@ public class IOUtils {
 			dir.mkdirs();
 		}
 
-		FileWriter writerVersion = new FileWriter(new File(dir, filename));
+		writeSmallFile(new File(dir, filename), content);
+	}
+
+	/**
+	 * Write the {@link String} content to {@link File}.
+	 * 
+	 * @param file
+	 *            the {@link File} to write
+	 * @param content
+	 *            the content
+	 * 
+	 * @throws IOException
+	 *             in case of I/O error
+	 */
+	public static void writeSmallFile(File file, String content)
+			throws IOException {
+		FileOutputStream out = new FileOutputStream(file);
 		try {
-			writerVersion.write(content);
+			out.write(content.getBytes("UTF-8"));
 		} finally {
-			writerVersion.close();
+			out.close();
 		}
 	}
 
@@ -173,17 +250,69 @@ public class IOUtils {
 	 *             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 {
+		ByteArrayOutputStream out = new ByteArrayOutputStream();
+		try {
+			write(stream, out);
+			return out.toString("UTF-8");
+		} finally {
+			// do NOT close, or the related stream will be closed, too
+			// out.close();
+		}
+	}
+
+	/**
+	 * 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()) {
+			StringBuilder slist = new StringBuilder();
+			for (File file : list) {
+				slist.append("\n").append(file.getPath());
+			}
+
+			throw new IOException("Cannot delete all the files from: <" //
+					+ target + ">:" + slist.toString());
 		}
+
+		return list.isEmpty();
 	}
 
 	/**
@@ -194,18 +323,44 @@ public class IOUtils {
 	 * 
 	 * @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;
 	}
 
 	/**
@@ -224,4 +379,99 @@ public class IOUtils {
 
 		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 {
+		boolean resetable = in.markSupported();
+		if (resetable) {
+			try {
+				in.reset();
+			} catch (IOException e) {
+				resetable = false;
+			}
+		}
+
+		if (resetable) {
+			return in;
+		}
+
+		final File tmp = File.createTempFile(".tmp-stream.", ".tmp");
+		try {
+			write(in, tmp);
+			in.close();
+
+			final FileInputStream fis = new FileInputStream(tmp);
+			return new MarkableFileInputStream(fis) {
+				@Override
+				public void close() throws IOException {
+					try {
+						try {
+							super.close();
+						} finally {
+							try {
+								fis.close();
+							} catch (IOException e) {
+							}
+						}
+					} finally {
+						tmp.delete();
+					}
+				}
+			};
+		} catch (IOException e) {
+			tmp.delete();
+			throw e;
+		}
+	}
+
+	/**
+	 * 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();
+		try {
+			write(in, out);
+			return out.toByteArray();
+		} finally {
+			out.close();
+		}
+	}
+
+	/**
+	 * Convert the {@link File} into a byte array.
+	 * 
+	 * @param file
+	 *            the input {@link File}
+	 * 
+	 * @return the array
+	 * 
+	 * @throws IOException
+	 *             in case of I/O error
+	 */
+	public static byte[] toByteArray(File file) throws IOException {
+		FileInputStream fis = new FileInputStream(file);
+		try {
+			return toByteArray(fis);
+		} finally {
+			fis.close();
+		}
+	}
 }