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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.
package org.python.modules;
import org.python.core.Py;
import org.python.core.PyFile;
import org.python.core.PyList;
import org.python.core.PyModule;
import org.python.core.PyObject;
import org.python.core.PyString;
import org.python.core.PySystemState;
import org.python.core.PyTuple;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
/*
* A bogus implementation of the CPython builtin module "imp".
* Only the functions required by IDLE and PMW are implemented.
* Luckily these function are also the only function that IMO can
* be implemented under Jython.
*/
public class imp {
public static PyString __doc__ = new PyString(
"This module provides the components needed to build your own\n"+
"__import__ function. Undocumented functions are obsolete.\n"
);
public static final int PY_SOURCE = 1;
public static final int PY_COMPILED = 2;
public static final int C_EXTENSION = 3;
public static final int PKG_DIRECTORY = 5;
public static final int C_BUILTIN = 6;
public static final int PY_FROZEN = 7;
public static final int IMP_HOOK = 9;
private static class ModuleInfo {
PyObject file;
String filename;
String suffix;
String mode;
int type;
ModuleInfo(PyObject file, String filename, String suffix, String mode, int type) {
this.file = file;
this.filename = filename;
this.suffix = suffix;
this.mode = mode;
this.type = type;
}
}
private static PyObject newFile(File file) {
try {
return new PyFile(new FileInputStream(file));
} catch (IOException ioe) {
throw Py.IOError(ioe);
}
}
private static boolean caseok(File file, String filename) {
return org.python.core.imp.caseok(file, filename);
}
/**
* This needs to be consolidated with the code in (@see org.python.core.imp).
*
* @param name module name
* @param entry a path String
* @param findingPackage if looking for a package only try to locate __init__
* @return null if no module found otherwise module information
*/
static ModuleInfo findFromSource(String name, String entry, boolean findingPackage,
boolean preferSource) {
String sourceName = "__init__.py";
String compiledName = "__init__$py.class";
String directoryName = PySystemState.getPathLazy(entry);
// displayDirName is for identification purposes: when null it
// forces java.io.File to be a relative path (e.g. foo/bar.py
// instead of /tmp/foo/bar.py)
String displayDirName = entry.equals("") ? null : entry;
// First check for packages
File dir = findingPackage ? new File(directoryName) : new File(directoryName, name);
File sourceFile = new File(dir, sourceName);
File compiledFile = new File(dir, compiledName);
boolean pkg = dir.isDirectory() && caseok(dir, name) && (sourceFile.isFile()
|| compiledFile.isFile());
if(!findingPackage) {
if(pkg) {
return new ModuleInfo(Py.None, new File(displayDirName, name).getPath(),
"", "", PKG_DIRECTORY);
} else {
Py.writeDebug("import", "trying source " + dir.getPath());
sourceName = name + ".py";
compiledName = name + "$py.class";
sourceFile = new File(directoryName, sourceName);
compiledFile = new File(directoryName, compiledName);
}
}
if (sourceFile.isFile() && caseok(sourceFile, sourceName)) {
if (!preferSource && compiledFile.isFile() && caseok(compiledFile, compiledName)) {
Py.writeDebug("import", "trying precompiled " + compiledFile.getPath());
long pyTime = sourceFile.lastModified();
long classTime = compiledFile.lastModified();
if (classTime >= pyTime) {
return new ModuleInfo(newFile(compiledFile),
new File(displayDirName, compiledName).getPath(),
".class", "rb", PY_COMPILED);
}
}
return new ModuleInfo(newFile(sourceFile),
new File(displayDirName, sourceName).getPath(),
".py", "r", PY_SOURCE);
}
// If no source, try loading precompiled
Py.writeDebug("import", "trying " + compiledFile.getPath());
if (compiledFile.isFile() && caseok(compiledFile, compiledName)) {
return new ModuleInfo(newFile(compiledFile),
new File(displayDirName, compiledName).getPath(),
".class", "rb", PY_COMPILED);
}
return null;
}
public static PyObject load_dynamic(String name, String pathname) {
return load_dynamic(name, pathname, null);
}
public static PyObject load_dynamic(String name, String pathname, PyObject file) {
throw Py.ImportError("No module named " + name);
}
public static PyObject load_source(String modname, String filename) {
return load_source(modname, filename, null);
}
public static PyObject load_source(String modname, String filename, PyObject file) {
PyObject mod = Py.None;
if (file == null) {
// XXX: This should load the accompanying byte code file instead, if it exists
file = new PyFile(filename, "r", 1024);
}
Object o = file.__tojava__(InputStream.class);
if (o == Py.NoConversion) {
throw Py.TypeError("must be a file-like object");
}
PySystemState sys = Py.getSystemState();
String compiledFilename =
org.python.core.imp.makeCompiledFilename(sys.getPath(filename));
mod = org.python.core.imp.createFromSource(modname.intern(), (InputStream)o,
filename, compiledFilename);
PyObject modules = sys.modules;
modules.__setitem__(modname.intern(), mod);
return mod;
}
public static PyObject load_compiled(String name, String pathname) {
return load_compiled(name, pathname, new PyFile(pathname, "rb", -1));
}
public static PyObject load_compiled(String name, String pathname, PyObject file) {
InputStream stream = (InputStream) file.__tojava__(InputStream.class);
if (stream == Py.NoConversion) {
throw Py.TypeError("must be a file-like object");
}
// XXX: Ideally we wouldn't care about sourceName here (see
// http://bugs.jython.org/issue1605847 msg3805)
String sourceName = pathname;
if (sourceName.endsWith("$py.class")) {
sourceName = sourceName.substring(0, sourceName.length() - 9) + ".py";
}
return org.python.core.imp.loadFromCompiled(name.intern(), stream, sourceName, pathname);
}
public static PyObject find_module(String name) {
return find_module(name, Py.None);
}
public static PyObject find_module(String name, PyObject path) {
if (path == Py.None && PySystemState.getBuiltin(name) != null) {
return new PyTuple(Py.None, Py.newString(name),
new PyTuple(Py.EmptyString, Py.EmptyString,
Py.newInteger(C_BUILTIN)));
}
if (path == Py.None) {
path = Py.getSystemState().path;
}
for (PyObject p : path.asIterable()) {
ModuleInfo mi = findFromSource(name, p.toString(), false, true);
if(mi == null) {
continue;
}
return new PyTuple(mi.file,
new PyString(mi.filename),
new PyTuple(new PyString(mi.suffix),
new PyString(mi.mode),
Py.newInteger(mi.type)));
}
throw Py.ImportError("No module named " + name);
}
public static PyObject load_module(String name, PyObject file, PyObject filename, PyTuple data) {
PyObject mod = Py.None;
PySystemState sys = Py.getSystemState();
int type = data.__getitem__(2).asInt();
while(mod == Py.None) {
String compiledName;
switch (type) {
case PY_SOURCE:
Object o = file.__tojava__(InputStream.class);
if (o == Py.NoConversion) {
throw Py.TypeError("must be a file-like object");
}
// XXX: This should load the accompanying byte code file instead, if it exists
String resolvedFilename = sys.getPath(filename.toString());
compiledName = org.python.core.imp.makeCompiledFilename(resolvedFilename);
if (name.endsWith(".__init__")) {
name = name.substring(0, name.length() - ".__init__".length());
} else if (name.equals("__init__")) {
name = new File(sys.getCurrentWorkingDir()).getName();
}
File fp = new File(resolvedFilename);
long mtime = -1;
if (fp.isFile()) {
mtime = fp.lastModified();
}
mod = org.python.core.imp.createFromSource(name.intern(),
(InputStream)o,
filename.toString(),
compiledName,
mtime);
break;
case PY_COMPILED:
mod = load_compiled(name, filename.toString(), file);
break;
case PKG_DIRECTORY:
PyModule m = org.python.core.imp.addModule(name);
m.__dict__.__setitem__("__path__", new PyList(new PyObject[] {filename}));
m.__dict__.__setitem__("__file__", filename);
ModuleInfo mi = findFromSource(name, filename.toString(), true, true);
type = mi.type;
file = mi.file;
filename = new PyString(mi.filename);
break;
default:
throw Py.ImportError("No module named " + name);
}
}
PyObject modules = sys.modules;
modules.__setitem__(name.intern(), mod);
return mod;
}
public static PyObject get_suffixes() {
return new PyList(new PyObject[] {new PyTuple(new PyString(".py"),
new PyString("r"),
Py.newInteger(PY_SOURCE)),
new PyTuple(new PyString("$py.class"),
new PyString("rb"),
Py.newInteger(PY_COMPILED)),});
}
public static PyModule new_module(String name) {
return new PyModule(name, null);
}
public static boolean is_builtin(String name) {
return PySystemState.getBuiltin(name) != null;
}
public static boolean is_frozen(String name) {
return false;
}
/**
* Acquires the interpreter's import lock for the current thread.
*
* This lock should be used by import hooks to ensure
* thread-safety when importing modules.
*
*/
public static void acquire_lock() {
org.python.core.imp.importLock.lock();
}
/**
* Release the interpreter's import lock.
*
*/
public static void release_lock() {
try{
org.python.core.imp.importLock.unlock();
}catch(IllegalMonitorStateException e){
throw Py.RuntimeError("not holding the import lock");
}
}
/**
* Return true if the import lock is currently held, else false.
*
* @return true if the import lock is currently held, else false.
*/
public static boolean lock_held() {
return org.python.core.imp.importLock.isHeldByCurrentThread();
}
}