package com.twosigma.beaker.autocomplete;
import java.io.File;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
public class ClasspathScanner {
private Map<String,List<String>> packages;
public ClasspathScanner() {
packages = new HashMap<String,List<String>>();
String classpath = System.getProperty("java.class.path");
scanClasses(classpath);
}
public ClasspathScanner(String classpath) {
packages = new HashMap<String,List<String>>();
scanClasses(classpath);
}
public Set<String> getPackages() { return packages.keySet(); }
public List<String> getClasses(String p) { if(packages.containsKey(p)) return packages.get(p); return null; }
private void scanClasses(String classpath) {
String[] paths = classpath.split(System.getProperty("path.separator"));
String javaHome = System.getProperty("java.home");
File file = new File(javaHome + File.separator + "lib");
if (file.exists()) {
findClasses(file, file, true);
}
for (String path : paths) {
file = new File(path);
if (file.exists()) {
findClasses(file, file, false);
}
}
}
private boolean findClasses(File root, File file, boolean includeJars) {
if (file.isDirectory()) {
for (File child : file.listFiles()) {
if (!findClasses(root, child, includeJars)) {
return false;
}
}
} else {
if (file.getName().toLowerCase().endsWith(".jar") && includeJars) {
JarFile jar = null;
try {
jar = new JarFile(file);
} catch (Exception ex) {
}
if (jar != null) {
Enumeration<JarEntry> entries = jar.entries();
while (entries.hasMoreElements()) {
JarEntry entry = entries.nextElement();
String name = entry.getName();
int extIndex = name.lastIndexOf(".class");
if (extIndex > 0 && !name.contains("$")) {
String cname = name.substring(0, extIndex).replace("/", ".");
int pIndex = cname.lastIndexOf('.');
if(pIndex > 0) {
String pname = cname.substring(0, pIndex);
cname = cname.substring(pIndex+1);
if(!packages.containsKey(pname))
packages.put(pname, new ArrayList<String>());
packages.get(pname).add(cname);
}
}
}
}
}
else if (file.getName().toLowerCase().endsWith(".class")) {
String cname = createClassName(root, file);
if(!cname.contains("$")) {
int pIndex = cname.lastIndexOf('.');
if(pIndex > 0) {
String pname = cname.substring(0, pIndex+1);
cname = cname.substring(pIndex);
if(!packages.containsKey(pname))
packages.put(pname, new ArrayList<String>());
packages.get(pname).add(cname);
}
}
}
}
return true;
}
private String createClassName(File root, File file) {
StringBuffer sb = new StringBuffer();
String fileName = file.getName();
sb.append(fileName.substring(0, fileName.lastIndexOf(".class")));
file = file.getParentFile();
while (file != null && !file.equals(root)) {
sb.insert(0, '.').insert(0, file.getName());
file = file.getParentFile();
}
return sb.toString();
}
}