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FileUtil.java
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125 lines (111 loc) · 3.72 KB
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// Copyright (c) 2003 Jython project
package org.python.core.util;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.python.core.PyFile;
/**
* Utility methods for Java file handling.
*/
public class FileUtil {
/**
* Creates a PyFile with mode that reads from the given <code>InputStream</code> using bufsize.
*/
public static PyFile wrap(InputStream is, String mode, int bufsize) {
return new PyFile(is, "<Java InputStream '" + is + "' as file>", mode, bufsize, true);
}
/**
* Creates a PyFile with mode that reads from the <code>InputStream</code>.
*/
public static PyFile wrap(InputStream is, String mode) {
return wrap(is, mode, -1);
}
/**
* Creates a PyFile in text mode that reads from the given <code>InputStream</code>
* using bufsize.
*/
public static PyFile wrap(InputStream is, int bufsize) {
return wrap(is, "r", bufsize);
}
/**
* Creates a PyFile in text mode that reads from the given <code>InputStream</code>.
*/
public static PyFile wrap(InputStream is) {
return wrap(is, -1);
}
/**
* Creates a PyFile with mode that writes to the given <code>OutputStream</code> with the
* given bufsize.
*/
public static PyFile wrap(OutputStream os, String mode, int bufsize) {
return new PyFile(os, mode, bufsize);
}
/**
* Creates a PyFile with mode that writes to the given <code>OutputStream</code>
*/
public static PyFile wrap(OutputStream os, String mode) {
return wrap(os, mode, -1);
}
/**
* Creates a PyFile in text mode that writes to the given <code>OutputStream</code>
* with bufsize.
*/
public static PyFile wrap(OutputStream os, int bufsize) {
return wrap(os, "w", bufsize);
}
/**
* Creates a PyFile in text mode that writes to the given <code>OutputStream</code>.
*/
public static PyFile wrap(OutputStream os) {
return wrap(os, -1);
}
/**
* Read all bytes from the input stream. <p> Note that using this method to
* read very large streams could cause out-of-memory exceptions and/or block
* for large periods of time.
*/
public static byte[] readBytes(InputStream in) throws IOException {
final int bufsize = 8192; // nice buffer size used in JDK
byte[] buf = new byte[bufsize];
ByteArrayOutputStream out = new ByteArrayOutputStream(bufsize);
int count;
while (true) {
count = in.read(buf, 0, bufsize);
if (count < 0) {
break;
}
out.write(buf, 0, count);
}
return out.toByteArray();
}
/**
* Create the named file (if necessary) and give just the owner read-write access.
*
* @param filename to create/control
* @return {@code File} object for subsequent open
* @throws IOException
*/
public static File makePrivateRW(String filename) throws IOException {
return makePrivateRW(new File(filename));
}
/**
* Create the identified file (if necessary) and give just the owner read-write access.
*
* @param file to create/control
* @return {@code File} object for subsequent open
* @throws IOException
*/
public static File makePrivateRW(File file) throws IOException {
file.createNewFile();
// Remove permissions for all
file.setReadable(false, false);
file.setWritable(false, false);
file.setExecutable(false, false);
// Add permissions for owner
file.setReadable(true);
file.setWritable(true);
return file;
}
}