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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
The newest version!
/**
* Copyright 2009, Google Inc. All rights reserved.
* Licensed to PSF under a Contributor Agreement.
*/
package org.python.indexer;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.security.MessageDigest;
import java.util.Collection;
import java.util.Set;
import java.util.TreeSet;
public class Util {
private static final String UTF_8 = "UTF-8";
private static final char SEPCHAR = File.separatorChar;
private static final String SEP = File.separator;
private static final String INIT_PY = "__init__.py";
private static final String SEP_INIT_PY = SEP + INIT_PY;
private static int gensymCount = -1;
public static String gensym(String base) {
gensymCount++;
return base + gensymCount;
}
public static String getSystemTempDir() {
String tmp = System.getProperty("java.io.tmpdir");
if (tmp.endsWith(SEP)) {
return tmp;
}
return tmp + SEP;
}
/**
* Returns the parent qname of {@code qname} -- everything up to the
* last dot (exclusive), or if there are no dots, the empty string.
*/
public static String getQnameParent(String qname) {
if (qname == null || qname.length() == 0) {
return "";
}
int index = qname.lastIndexOf(".");
if (index == -1) {
return "";
}
return qname.substring(0, index);
}
/**
* Determines the fully-qualified module name for the specified file. A
* module's qname is a function of the module's absolute path and the sys
* path; it does not depend on how the module name may have been specified
* in import statements. The module qname is the relative path of the module
* under the load path, with slashes converted to dots.
*
* @param file absolute canonical path to a file (__init__.py for dirs)
* @return null if {@code file} is not somewhere under the load path
*/
public static String moduleQname(String file) {
boolean initpy = file.endsWith(SEP_INIT_PY);
if (initpy) {
file = file.substring(0, file.length() - SEP_INIT_PY.length());
} else if (file.endsWith(".py")) {
file = file.substring(0, file.length() - ".py".length());
}
for (String root : Indexer.idx.getLoadPath()) {
if (file.startsWith(root)) {
return file.substring(root.length()).replace(SEPCHAR, '.');
}
}
return null;
}
public static String arrayToString(Collection strings) {
StringBuffer sb = new StringBuffer();
for (String s : strings) {
sb.append(s).append("\n");
}
return sb.toString();
}
public static String arrayToSortedStringSet(Collection strings) {
Set sorter = new TreeSet();
sorter.addAll(strings);
return arrayToString(sorter);
}
/**
* Given an absolute {@code path} to a file (not a directory),
* returns the module name for the file. If the file is an __init__.py,
* returns the last component of the file's parent directory, else
* returns the filename without path or extension.
*/
public static String moduleNameFor(String path) {
File f = new File(path);
if (f.isDirectory()) {
throw new IllegalStateException("failed assertion: " + path);
}
String fname = f.getName();
if (fname.equals(INIT_PY)) {
return f.getParentFile().getName();
}
return fname.substring(0, fname.lastIndexOf('.'));
}
public static File joinPath(File dir, String file) {
return joinPath(dir.getAbsolutePath(), file);
}
public static File joinPath(String dir, String file) {
if (dir.endsWith(SEP)) {
return new File(dir + file);
}
return new File(dir + SEP + file);
}
public static void writeFile(String path, String contents) throws Exception {
PrintWriter out = null;
try {
out = new PrintWriter(new BufferedWriter(new FileWriter(path)));
out.print(contents);
out.flush();
} finally {
if (out != null) {
out.close();
}
}
}
public static String readFile(String filename) throws Exception {
return readFile(new File(filename));
}
public static String readFile(File path) throws Exception {
// Don't use line-oriented file read -- need to retain CRLF if present
// so the style-run and link offsets are correct.
return new String(getBytesFromFile(path), UTF_8);
}
public static byte[] getBytesFromFile(File file) throws IOException {
InputStream is = null;
try {
is = new FileInputStream(file);
long length = file.length();
if (length > Integer.MAX_VALUE) {
throw new IOException("file too large: " + file);
}
byte[] bytes = new byte[(int)length];
int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead = is.read(bytes, offset, bytes.length-offset)) >= 0) {
offset += numRead;
}
if (offset < bytes.length) {
throw new IOException("Failed to read whole file " + file);
}
return bytes;
} finally {
if (is != null) {
is.close();
}
}
}
public static String getMD5(File path) throws Exception {
byte[] bytes = getBytesFromFile(path);
return getMD5(bytes);
}
public static String getMD5(byte[] fileContents) throws Exception {
MessageDigest algorithm = MessageDigest.getInstance("MD5");
algorithm.reset();
algorithm.update(fileContents);
byte messageDigest[] = algorithm.digest();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < messageDigest.length; i++) {
sb.append(String.format("%02x", 0xFF & messageDigest[i]));
}
return sb.toString();
}
/**
* Return absolute path for {@code path}.
* Make sure path ends with SEP if it's a directory.
* Does _not_ resolve symlinks, since the caller may need to play
* symlink tricks to produce the desired paths for loaded modules.
*/
public static String canonicalize(String path) {
File f = new File(path);
path = f.getAbsolutePath();
if (f.isDirectory() && !path.endsWith(SEP)) {
return path + SEP;
}
return path;
}
static boolean isReadableFile(String path) {
File f = new File(path);
return f.canRead() && f.isFile();
}
}