// Copyright (c) Corporation for National Research Initiatives
// Copyright 2000 Samuele Pedroni
package org.python.core;
import java.io.EOFException;
/**
* Abstract package manager.
*/
public abstract class PackageManager extends Object {
public PyJavaPackage topLevelPackage;
public PackageManager() {
this.topLevelPackage = new PyJavaPackage("", this);
}
abstract public Class findClass(String pkg, String name, String reason);
public Class findClass(String pkg, String name) {
return findClass(pkg, name, "java class");
}
public void notifyPackageImport(String pkg, String name) {
}
/**
* Dynamically check if pkg.name exists as java pkg in the controlled
* hierarchy. Should be overriden.
*
* @param pkg parent pkg name
* @param name candidate name
* @return true if pkg exists
*/
public abstract boolean packageExists(String pkg, String name);
/**
* Reports the specified package content names. Should be overriden. Used by
* {@link PyJavaPackage#__dir__} and {@link PyJavaPackage#fillDir}.
*
* @return resulting list of names (PyList of PyString)
* @param jpkg queried package
* @param instantiate if true then instatiate reported names in package dict
* @param exclpkgs exclude packages (just when instantiate is false)
*/
public abstract PyList doDir(PyJavaPackage jpkg, boolean instantiate, boolean exclpkgs);
/**
* Append a directory to the list of directories searched for java packages
* and java classes.
*
* @param dir A directory.
*/
public abstract void addDirectory(java.io.File dir);
/**
* Append a directory to the list of directories searched for java packages
* and java classes.
*
* @param dir A directory name.
*/
public abstract void addJarDir(String dir, boolean cache);
/**
* Append a jar file to the list of locations searched for java packages and
* java classes.
*
* @param jarfile A directory name.
*/
public abstract void addJar(String jarfile, boolean cache);
/**
* Basic helper implementation of {@link #doDir}. It merges information
* from jpkg {@link PyJavaPackage#clsSet} and {@link PyJavaPackage#__dict__}.
*/
protected PyList basicDoDir(PyJavaPackage jpkg, boolean instantiate, boolean exclpkgs) {
PyStringMap dict = jpkg.__dict__;
PyStringMap cls = jpkg.clsSet;
if (!instantiate) {
PyList ret = cls.keys();
PyList dictKeys = dict.keys();
for (int i = 0; i < dictKeys.__len__(); i++) {
PyObject name = dictKeys.pyget(i);
if (!cls.has_key(name)) {
if (exclpkgs && dict.get(name) instanceof PyJavaPackage)
continue;
ret.append(name);
}
}
return ret;
}
PyList clsNames = cls.keys();
for (int i = 0; i < clsNames.__len__(); i++) {
PyObject name = clsNames.pyget(i);
if (!dict.has_key(name))
jpkg.addLazyClass(name.toString());
}
return dict.keys();
}
/**
* Helper merging list2 into list1. Returns list1.
*/
protected PyList merge(PyList list1, PyList list2) {
for (int i = 0; i < list2.__len__(); i++) {
PyObject name = list2.pyget(i);
list1.append(name);
}
return list1;
}
public PyObject lookupName(String name) {
PyObject top = this.topLevelPackage;
do {
int dot = name.indexOf('.');
String firstName = name;
String lastName = null;
if (dot != -1) {
firstName = name.substring(0, dot);
lastName = name.substring(dot + 1, name.length());
}
firstName = firstName.intern();
top = top.__findattr__(firstName);
if (top == null)
return null;
// ??pending: test for jpkg/jclass?
name = lastName;
} while (name != null);
return top;
}
/**
* Creates package/updates statically known classes info. Uses
* {@link PyJavaPackage#addPackage(java.lang.String, java.lang.String) },
* {@link PyJavaPackage#addPlaceholders}.
*
* @param name package name
* @param classes comma-separated string
* @param jarfile involved jarfile; can be null
* @return created/updated package
*/
public PyJavaPackage makeJavaPackage(String name, String classes, String jarfile) {
PyJavaPackage p = this.topLevelPackage;
if (name.length() != 0)
p = p.addPackage(name, jarfile);
if (classes != null)
p.addPlaceholders(classes);
return p;
}
/**
* Check that a given stream is a valid Java .class file. And return its
* access permissions as an int.
*/
static protected int checkAccess(java.io.InputStream cstream) throws java.io.IOException {
java.io.DataInputStream istream = new java.io.DataInputStream(cstream);
try {
int magic = istream.readInt();
if (magic != 0xcafebabe) {
return -1;
}
} catch (EOFException eof) {
//Empty or 1 byte file.
return -1;
}
//int minor =
istream.readShort();
//int major =
istream.readShort();
// Check versions???
// System.out.println("magic: "+magic+", "+major+", "+minor);
int nconstants = istream.readShort();
for (int i = 1; i < nconstants; i++) {
int cid = istream.readByte();
// System.out.println(""+i+" : "+cid);
switch (cid) {
case 7:
istream.skipBytes(2);
break;
case 9:
case 10:
case 11:
istream.skipBytes(4);
break;
case 8:
istream.skipBytes(2);
break;
case 3:
case 4:
istream.skipBytes(4);
break;
case 5:
case 6:
istream.skipBytes(8);
i++;
break;
case 12:
istream.skipBytes(4);
break;
case 1:
// System.out.println("utf: "+istream.readUTF()+";");
int slength = istream.readUnsignedShort();
istream.skipBytes(slength);
break;
default:
// System.err.println("unexpected cid: "+cid+", "+i+", "+
// nconstants);
// for (int j=0; j<10; j++)
// System.err.print(", "+istream.readByte());
// System.err.println();
return -1;
}
}
return istream.readShort();
}
}