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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/*
* Contributor(s): Thomas Ball
*/
import org.netbeans.modules.classfile.*;
import java.io.*;
import java.util.*;
/**
* Closure: report all classes which this file references in one
* way or another. Note: this utility won't find classes which are
* dynamically loaded.
*
* @author Thomas Ball
*/
public class Closure {
String thisClass;
Set<String> closure;
Closure(String spec) {
thisClass = spec;
}
void buildClosure(boolean includeJDK)
throws IOException {
if (closure != null)
return;
closure = new HashSet<String>();
Set<String> visited = new HashSet<String>();
Stack<ClassName> stk = new Stack<ClassName>();
ClassName thisCN = ClassName.getClassName(thisClass.replace('.', '/'));
stk.push(thisCN);
visited.add(thisCN.getExternalName());
while (!stk.empty()) {
// Add class to closure.
ClassName cn = (ClassName)stk.pop();
InputStream is = findClassStream(cn.getType());
if (is == null) {
System.err.println("couldn't find class: " +
cn.getExternalName());
continue;
}
ClassFile cfile = new ClassFile(is);
closure.add(cfile.getName().getExternalName());
ConstantPool pool = cfile.getConstantPool();
Iterator refs = pool.getAllClassNames().iterator();
while (refs.hasNext()) {
ClassName cnRef = (ClassName)refs.next();
String cname = cnRef.getExternalName();
if (cname.indexOf('[') != -1) {
// skip arrays
} else if (!includeJDK &&
(cname.startsWith("java.") ||
cname.startsWith("javax.") ||
cname.startsWith("sun.") ||
cname.startsWith("com.sun.corba") ||
cname.startsWith("com.sun.image") ||
cname.startsWith("com.sun.java.swing") ||
cname.startsWith("com.sun.naming") ||
cname.startsWith("com.sun.security"))) {
// if directed, skip JDK references
} else {
boolean isNew = visited.add(cname);
if (isNew)
stk.push(cnRef);
}
}
}
}
void dumpClosure(PrintStream out) {
Iterator iter = new TreeSet(closure).iterator();
while (iter.hasNext())
out.println((String)iter.next());
}
Iterator dependencies() {
return closure.iterator();
}
private InputStream findClassStream(String className) {
InputStream is =
ClassLoader.getSystemClassLoader().getResourceAsStream(className + ".class");
return is;
}
/**
* An error routine which displays the command line usage
* before exiting.
*/
public static void usage() {
System.err.println(
"usage: java Closure [-includejdk] <class> [ <class> ...]");
System.exit(1);
}
public static void main(String[] args) {
if (args.length == 0)
usage();
boolean includeJDK = false;
for (int i = 0; i < args.length; i++) {
if (args[i].equals("-includejdk"))
includeJDK = true;
else if (args[i].charAt(0) == '-')
usage();
else {
try {
Closure c = new Closure(args[i]);
c.buildClosure(includeJDK);
c.dumpClosure(System.out);
} catch (IOException e) {
System.err.println("error accessing \"" + args[i] +
"\": " + e.toString());
}
}
}
}
}
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