info.monitorenter.util.FileUtil Maven / Gradle / Ivy
/*
* FileUtil.java, helpers for disk I/O.
* Copyright (C) 2001 - 2010 Achim Westermann.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* If you modify or optimize the code in a useful way please let me know.
* [email protected]
*/
package info.monitorenter.util;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.text.MessageFormat;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.StringTokenizer;
/**
* Utility class for file operations.
*
* For methods that are not static get the singleton instance via
* {@link #getInstance()}.
*
*
* @author Achim Westermann
*
* @version 1.1
*/
public final class FileUtil extends Object {
/** The singleton instance of this class. */
private static FileUtil instance;
/**
* Cuts all path information of the String representation of the given URL.
*
*
*
*
* "file//c:/work/programming/anyfile.jar" --> "anyfile.jar"
* "http://jamwg.de" --> "" // No file part.
* "ftp://files.com/directory2/" --> "" // File part of URL denotes a directory.
*
*
*
* Assuming, that '/' is the current file separator character.
*
*
* @param path
* the absolute file path you want the mere file name of.
*
* @return the {@link java.util.Map.Entry} consisting of path
* information and file name.
*/
public static Map.Entry cutDirectoryInformation(final java.net.URL path) {
Map.Entry ret = null;
String pre;
String suf;
String parse;
final StringBuffer tmp = new StringBuffer();
parse = path.toExternalForm();
if (parse.endsWith("/")) {
pre = parse;
suf = "";
} else {
final StringTokenizer tokenizer = new StringTokenizer(path.getFile(), "/");
tmp.append(path.getProtocol());
tmp.append(":");
tmp.append(path.getHost());
pre = "";
while (tokenizer.hasMoreElements()) {
tmp.append(pre);
pre = tokenizer.nextToken();
tmp.append("/");
}
suf = pre;
pre = tmp.toString();
}
ret = new Entry(pre, suf);
return ret;
}
/**
* Cuts the path information of the String that is interpreted as a filename
* into the directory part and the file part. The current operating system's
* path separator is used to cut all path information from the String.
*
*
*
*
* "c:/work/programming/anyfile.jar" --> Map.Entry("c:/work/programming/","anyfile.jar");
* "anyfile.jar" --> Map.Entry(new File(".").getAbsolutePath(),"anyfile.jar");
* "c:/directory1/directory2/" --> Map.Entry("c:/directory1/directory2/","");
* "c:/directory1/directory2" --> Map.Entry("c:/directory1/directory2/",""); // directory2 is a dir!
* "c:/directory1/file2" --> Map.Entry("c:/directory1/","file2"); // file2 is a file!
* "c:/" --> Map.Entry("c:/","");
*
*
*
* Assuming, that '/' is the current file separator character.
*
*
* If your string is retrieved from an URL instance, use
* cutDirectoryInformation(URL path) instead, because URL's do not
* depend on the operating systems file separator!
*
*
* @param path
* the absolute file path you want the mere file name of.
*
* @return the {@link java.util.Map.Entry} consisting of path
* information and file name.
*/
public static Map.Entry cutDirectoryInformation(final String path) {
final StringBuffer dir = new StringBuffer();
String file = "";
final String fileseparator = System.getProperty("file.separator");
final StringTokenizer tokenizer = new StringTokenizer(path, fileseparator);
final int size = tokenizer.countTokens();
switch (size) {
case 0:
dir.append(new File(".").getAbsolutePath());
break;
case 1:
final File test = new File(tokenizer.nextToken());
if (new File(path).isDirectory()) {
dir.append(test.getAbsolutePath());
} else {
dir.append(new File(".").getAbsolutePath());
file = path;
}
break;
default:
String token;
while (tokenizer.hasMoreElements()) {
// reuse String file separator: bad style...
token = tokenizer.nextToken();
if (tokenizer.hasMoreTokens()) {
dir.append(token);
dir.append(fileseparator);
} else {
if (new File(path).isFile()) {
file = token;
} else {
dir.append(token);
}
}
}
}
return new Entry(dir.toString(), file);
}
/**
* Cuts a String into the part before the last dot and after the last dot. If
* only one dot is contained on the first position, it will completely be used
* as prefix part.
*
*
*
* Map.Entry entry = FileUtil.getPotentialExtension("A.Very.Strange.Name.txt");
* String prefix = (String) entry.getKey(); // prefix is "A.Very.Strange.Name".
* String suffix = (String) entry.getValue(); // suffix is "txt";
*
* entry = FileUtil.getPotentialExtension(".profile");
* String prefix = (String) entry.getKey(); // prefix is ".profile".
* String suffix = (String) entry.getValue(); // suffix is "";
*
* entry = FileUtil.getPotentialExtension("bash");
* String prefix = (String) entry.getKey(); // prefix is "bash".
* String suffix = (String) entry.getValue(); // suffix is "";
*
*
*
*
*
*
* @param filename
* A String that is interpreted to be a file name: The last dot ('.')
* is interpreted to be the extension delimiter.
*
* @return A java.util.Map.Entry instance containing a String for
* the filename at the key side and a String for the extension at the
* value side.
*/
public static Map.Entry cutExtension(final String filename) {
String prefix;
String suffix = null;
final StringTokenizer tokenizer = new StringTokenizer(filename, ".");
int tokenCount = tokenizer.countTokens();
if (tokenCount > 1) {
final StringBuffer prefCollect = new StringBuffer();
while (tokenCount > 1) {
tokenCount--;
prefCollect.append(tokenizer.nextToken());
if (tokenCount > 1) {
prefCollect.append(".");
}
}
prefix = prefCollect.toString();
suffix = tokenizer.nextToken();
} else {
prefix = filename;
suffix = "";
}
return new Entry(prefix, suffix);
}
/**
* Finds a filename based on the given name. If a file with the given name
* does not exist, name will be returned.
*
*
* Else:
*
*
* "myFile.out" --> "myFile_0.out"
* "myFile_0.out" --> "myFile_1.out"
* "myFile_1.out" --> "myFile_2.out"
* ....
*
*
*
*
* The potential extension is preserved, but a number is appended to the
* prefix name.
*
*
* @param name
* A desired file name.
*
* @return A String that sticks to the naming convention of the given String
* but is unique in the directory scope of argument name.
*/
public static String getDefaultFileName(final String name) {
String result;
File f = new File(name);
if (!f.exists()) {
result = f.getAbsolutePath();
} else {
final Map.Entry cut = FileUtil.cutExtension(name);
final String prefix = cut.getKey();
final String suffix = cut.getValue();
int num = 0;
while (f.exists()) {
f = new File(prefix + '_' + num + '.' + suffix);
num++;
}
result = f.getAbsolutePath();
}
return result;
}
/**
* Returns the singleton instance of this class.
*
*
* @return the singleton instance of this class.
*/
public static FileUtil getInstance() {
if (FileUtil.instance == null) {
FileUtil.instance = new FileUtil();
}
return FileUtil.instance;
}
/**
* Tests wether the given file only contains ASCII characters if interpreted
* by reading bytes (16 bit).
*
* This does not mean that the file is really an ASCII text file. It just
* might be viewed with an editor showing only valid ASCII characters.
*
*
* @param f
* the file to test.
*
* @return true if all bytes in the file are in the ASCII range.
*
* @throws java.io.IOException
* on a bad day.
*/
public static boolean isAllASCII(final File f) throws IOException {
return FileUtil.isAllASCII(new FileInputStream(f));
}
/**
* Tests wether the given input stream only contains ASCII characters if
* interpreted by reading bytes (16 bit).
*
* This does not mean that the underlying content is really an ASCII text
* file. It just might be viewed with an editor showing only valid ASCII
* characters.
*
*
* @param in
* the stream to test.
*
* @return true if all bytes in the given input stream are in the ASCII range.
*
* @throws java.io.IOException
* on a bad day.
*/
public static boolean isAllASCII(final InputStream in) throws IOException {
boolean ret = true;
int read = -1;
do {
read = in.read();
if (read > 0x7F) {
ret = false;
break;
}
} while (read != -1);
return ret;
}
/**
* Tests, wether the content of the given file is identical at character
* level, when it is opened with both different Charsets.
*
* This is most often the case, if the given file only contains ASCII codes
* but may also occur, when both codepages cover common ranges and the
* document only contains values m_out of those ranges (like the EUC-CN
* charset contains all mappings from BIG5).
*
*
* @param document
* the file to test.
*
* @param a
* the first character set to interpret the document in.
*
* @param b
* the 2nd character set to interpret the document in.
*
* @throws java.io.IOException
* if something goes wrong.
*
* @return true if both files have all equal contents if they are interpreted
* as character data in both given encodings (they may differ at
* binary level if both charsets are different).
*/
public static boolean isEqual(final File document, final Charset a, final Charset b)
throws IOException {
boolean ret = true;
FileInputStream aIn = null;
FileInputStream bIn = null;
InputStreamReader aReader = null;
InputStreamReader bReader = null;
try {
aIn = new FileInputStream(document);
bIn = new FileInputStream(document);
aReader = new InputStreamReader(aIn, a);
bReader = new InputStreamReader(bIn, b);
int readA = -1;
int readB = -1;
do {
readA = aReader.read();
readB = bReader.read();
if (readA != readB) {
// also the case, if one is at the end earlier...
ret = false;
break;
}
} while ((readA != -1) && (readB != -1));
return ret;
} finally {
if (aReader != null) {
aReader.close();
}
if (bReader != null) {
bReader.close();
}
}
}
/**
* Invokes {@link #readRAM(java.io.File)}, but decorates the result with a
* {@link java.io.ByteArrayInputStream}.
*
* This means: The complete content of the given File has been loaded before
* using the returned InputStream. There are no IO-delays afterwards but
* OutOfMemoryErrors may occur.
*
*
* @param f
* the file to cache.
*
* @return an input stream backed by the file read into memory.
*
* @throws java.io.IOException
* if something goes wrong.
*/
public static InputStream readCache(final File f) throws IOException {
return new ByteArrayInputStream(FileUtil.readRAM(f));
}
/**
* Reads the content of the given File into an array.
*
* This method currently does not check for maximum length and might cause a
* java.lang.OutOfMemoryError. It is only intended for
* performance-measurements of data-based algorithms that want to exclude
* I/O-usage.
*
*
* @param f
* the file to read.
*
* @throws java.io.IOException
* if something goes wrong.
*
* @return the contents of the given file.
*
*/
public static byte[] readRAM(final File f) throws IOException {
final int total = (int) f.length();
final byte[] ret = new byte[total];
final InputStream in = new FileInputStream(f);
try {
int offset = 0;
int read = 0;
do {
read = in.read(ret, offset, total - read);
if (read > 0) {
offset += read;
}
} while ((read != -1) && (offset != total));
return ret;
} finally {
in.close();
}
}
/**
* Removes the duplicate line breaks in the given file.
*
*
* Be careful with big files: In order to avoid having to write a tmpfile
* (cannot read and directly write to the same file) a StringBuffer is used
* for manipulation. Big files will cost all RAM and terminate VM hard.
*
*
* @param f
* the file to remove duplicate line breaks in.
*/
public static void removeDuplicateLineBreaks(final File f) {
final String sep = StringUtil.getNewLine();
if (!f.exists()) {
System.err.println("FileUtil.removeDuplicateLineBreak(File f): " + f.getAbsolutePath()
+ " does not exist!");
} else {
if (f.isDirectory()) {
System.err.println("FileUtil.removeDuplicateLineBreak(File f): " + f.getAbsolutePath()
+ " is a directory!");
} else {
// real file
FileInputStream inStream = null;
BufferedInputStream in = null;
FileWriter out = null;
try {
inStream = new FileInputStream(f);
in = new BufferedInputStream(inStream, 1024);
StringBuffer result = new StringBuffer();
int tmpread;
while ((tmpread = in.read()) != -1) {
result.append((char) tmpread);
}
String tmpstring;
final StringTokenizer toke = new StringTokenizer(result.toString(), sep, true);
result = new StringBuffer();
int breaks = 0;
while (toke.hasMoreTokens()) {
tmpstring = toke.nextToken().trim();
if (tmpstring.equals("") && (breaks > 0)) {
breaks++;
// if(breaks<=2)result.append(sep);
continue;
}
if (tmpstring.equals("")) {
tmpstring = sep;
breaks++;
} else {
breaks = 0;
}
result.append(tmpstring);
}
// delete original file and write it new from tmpfile.
f.delete();
f.createNewFile();
out = new FileWriter(f);
out.write(result.toString());
} catch (final FileNotFoundException e) {
// does never happen.
} catch (final IOException g) {
g.printStackTrace(System.err);
} finally {
if (in != null) {
try {
in.close();
} catch (final IOException e) {
e.printStackTrace();
}
}
if (out != null) {
try {
out.flush();
out.close();
} catch (final IOException e) {
e.printStackTrace();
}
}
}
}
}
}
/** Needed for localization. */
private final ResourceBundle m_bundle;
/**
* Utility class constructor.
*
*/
private FileUtil() {
this.m_bundle = ResourceBundle.getBundle("messages");
}
/**
* @see Object#equals(Object)
*/
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (this.getClass() != obj.getClass()) {
return false;
}
final FileUtil other = (FileUtil) obj;
if (this.m_bundle == null) {
if (other.m_bundle != null) {
return false;
}
} else if (!this.m_bundle.equals(other.m_bundle)) {
return false;
}
return true;
}
/**
* Returns the formatted file size to Bytes, KB, MB or GB depending on the
* given value.
*
*
* @param filesize
* in bytes
*
* @param locale
* the locale to translate the result to (e.g. in France they us
*
* @return the formatted filesize to Bytes, KB, MB or GB depending on the
* given value.
*/
public String formatFilesize(final long filesize, final Locale locale) {
String result;
final long filesizeNormal = Math.abs(filesize);
if (Math.abs(filesize) < 1024) {
result = MessageFormat.format(this.m_bundle.getString("GUI_FILEUTIL_FILESIZE_BYTES_1"),
new Object[] {new Long(filesizeNormal) });
} else if (filesizeNormal < 1048576) {
// 1048576 = 1024.0 * 1024.0
result = MessageFormat.format(this.m_bundle.getString("GUI_FILEUTIL_FILESIZE_KBYTES_1"),
new Object[] {new Double(filesizeNormal / 1024.0) });
} else if (filesizeNormal < 1073741824) {
// 1024.0^3 = 1073741824
result = MessageFormat.format(this.m_bundle.getString("GUI_FILEUTIL_FILESIZE_MBYTES_1"),
new Object[] {new Double(filesize / 1048576.0) });
} else {
result = MessageFormat.format(this.m_bundle.getString("GUI_FILEUTIL_FILESIZE_GBYTES_1"),
new Object[] {new Double(filesizeNormal / 1073741824.0) });
}
return result;
}
/**
* @see Object#hashCode()
*/
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((this.m_bundle == null) ? 0 : this.m_bundle.hashCode());
return result;
}
}