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package com.sun.jdo.api.persistence.enhancer.util;
import java.util.StringTokenizer;
import java.util.Enumeration;
import java.util.NoSuchElementException;
import java.io.File;
import java.io.IOException;
import java.io.FilenameFilter;
/**
* ClassPath provides class file lookup according to a classpath
* specification.
*/
public class ClassPath {
/* The entire class path specification */
private String theClassPathSpec;
/* Linked list of class path elements */
private ClassPathElement theClassPath;
/**
* Construct a class path from the input String argument.
* The path is expected to be in the form appropriate for the current
* execution environment.
*/
public ClassPath(String path) {
theClassPathSpec = path;
parsePath();
}
/**
* locate a class file given a fully qualified class name
*/
public ClassFileSource findClass(String className) {
return findClass(className, theClassPath);
}
/**
* locate a class file given a fully qualified class name
* starting at the specified class path element
*/
static ClassFileSource findClass(String className, ClassPathElement path) {
for (ClassPathElement e = path; e != null; e = e.next()) {
ClassFileSource source = e.sourceOf(className);
if (source != null) {
source.setSourceElement(e);
return source;
}
}
return null;
}
/**
* Return a file name which might reasonably identify a file containing
* the specified class. The name is a "./" relative path.
*/
public static String fileNameOf(String className, char separator) {
StringBuffer path = new StringBuffer();
StringTokenizer parser = new StringTokenizer(className, "./", false);//NOI18N
for (boolean first = true; parser.hasMoreElements(); first = false) {
if (!first)
path.append(separator);
path.append(parser.nextToken());
}
path.append(".class");//NOI18N
return path.toString();
}
/**
* Return a file name which might reasonably identify a file containing
* the specified class. The name is a "./" relative path.
*/
public static String fileNameOf(String className) {
return fileNameOf(className, File.separatorChar);
}
/**
* Return a file name which might reasonably identify a file containing
* the specified class in a zip file.
*/
public static String zipFileNameOf(String className) {
return fileNameOf(className, '/');
}
/**
* Return the vm class name which corresponds to the input file name.
* The file name is expected to be a "./" relative path.
* Returns null if the file name doesn't end in ".class"
*/
public static String classNameOf(String fileName) {
int fnlen = fileName.length();
if (fnlen > 6 && fileName.regionMatches(true, fnlen - 6, ".class", 0, 6)) {//NOI18N
/* the file name ends with .class */
fileName = fileName.substring(0, fileName.length()-6);
StringBuffer className = new StringBuffer();
StringTokenizer parser = new StringTokenizer(fileName, "\\/", false);//NOI18N
for (boolean first = true; parser.hasMoreElements(); first = false) {
if (!first)
className.append('/');
className.append(parser.nextToken());
}
return className.toString();
}
return null;
}
/**
* Remove any class path elements which match directory
*/
public boolean remove(File directory) {
boolean matched = false;
ClassPathElement firstElement = theClassPath;
ClassPathElement prevElement = null;
for (ClassPathElement cpe = firstElement; cpe != null; cpe = cpe.next()) {
if (cpe.matches(directory)) {
matched = true;
if (prevElement == null)
firstElement = cpe.next();
else
prevElement.setNext(cpe.next());
} else {
prevElement = cpe;
}
}
theClassPath = firstElement;
return matched;
}
/**
* Append a directory to the classpath.
*/
public void append(File directory) {
append(ClassPathElement.create(directory.getPath()));
}
/**
* Append a class path element to the classpath.
*/
public void append(ClassPathElement anElement) {
if (theClassPath == null)
theClassPath = anElement;
else
theClassPath.append(anElement);
}
/**
* Return an enumeration of all of the class files in the specified
* package in this class path.
* @param packageName specifies the VM format package name
* to which class files must belong.
* @returns an Enumeration of the VM format class names which
* can be found. Note that the Enumeration value is of type String
* and duplicate entries may be returned as the result of finding
* a class through more than one class path element. Note also
* that the class name returned might not correspond the the
* name of the class in the file.
*/
public Enumeration classesInPackage(String packageName) {
return new ClassPackageEnumeration(this, packageName);
}
/* package local accessors */
ClassPathElement getPathElements() {
return theClassPath;
}
/* private accessors */
private void parsePath() {
StringTokenizer parser =
new StringTokenizer(theClassPathSpec,
java.io.File.pathSeparator,
false /* dont return delimiters */
);
ClassPathElement lastElement = null;
while (parser.hasMoreElements()) {
ClassPathElement anElement = ClassPathElement.create(parser.nextToken());
if (lastElement == null)
theClassPath = anElement;
else
lastElement.append(anElement);
lastElement = anElement;
}
}
}
/**
* An enumeration class which returns the names of the classes which
* can be found in a class path
*/
class ClassPackageEnumeration implements Enumeration {
/* The next class path element to look for matches in once
the current enumeration is complete */
private ClassPathElement nextClassPathElement;
/* The package name */
private String thePackageName;
/* The enumeration of matching class names in the current class path
element */
private Enumeration currentElementEnumeration;
/**
* Construct a ClassPackageEnumeration.
* @param classPath The class path in which to search for classes.
* @param packageName The VM name of the package in which to search.
*/
ClassPackageEnumeration(ClassPath classPath, String packageName) {
nextClassPathElement = classPath.getPathElements();
thePackageName = packageName;
}
public boolean hasMoreElements() {
while ((currentElementEnumeration == null ||
!currentElementEnumeration.hasMoreElements()) &&
nextClassPathElement != null) {
currentElementEnumeration =
nextClassPathElement.classesInPackage(thePackageName);
nextClassPathElement = nextClassPathElement.next();
}
return (currentElementEnumeration != null &&
currentElementEnumeration.hasMoreElements());
}
public Object nextElement() {
if (hasMoreElements())
return currentElementEnumeration.nextElement();
throw new NoSuchElementException();
}
}
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