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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.classfile.util;
import proguard.classfile.ClassConstants;
import java.util.Stack;
/**
* A <code>DescriptorClassEnumeration</code> provides an enumeration of all
* classes mentioned in a given descriptor or signature.
*
* @author Eric Lafortune
*/
public class DescriptorClassEnumeration
{
private String descriptor;
private int index;
private int nestingLevel;
private boolean isInnerClassName;
private String accumulatedClassName;
private Stack accumulatedClassNames;
/**
* Creates a new DescriptorClassEnumeration for the given descriptor.
*/
public DescriptorClassEnumeration(String descriptor)
{
this.descriptor = descriptor;
}
/**
* Returns the number of classes contained in the descriptor. This
* is the number of class names that the enumeration will return.
*/
public int classCount()
{
int count = 0;
nextFluff();
while (hasMoreClassNames())
{
count++;
nextClassName();
nextFluff();
}
index = 0;
return count;
}
/**
* Returns whether the enumeration can provide more class names from the
* descriptor.
*/
public boolean hasMoreClassNames()
{
return index < descriptor.length();
}
/**
* Returns the next fluff (surrounding class names) from the descriptor.
*/
public String nextFluff()
{
int fluffStartIndex = index;
// Find the first token marking the start of a class name 'L' or '.'.
loop: while (index < descriptor.length())
{
switch (descriptor.charAt(index++))
{
case ClassConstants.INTERNAL_TYPE_GENERIC_START:
{
nestingLevel++;
// Make sure we have a stack.
if (accumulatedClassNames == null)
{
accumulatedClassNames = new Stack();
}
// Remember the accumulated class name.
accumulatedClassNames.push(accumulatedClassName);
break;
}
case ClassConstants.INTERNAL_TYPE_GENERIC_END:
{
nestingLevel--;
// Return to the accumulated class name outside the
// generic block.
accumulatedClassName = (String)accumulatedClassNames.pop();
continue loop;
}
case ClassConstants.INTERNAL_TYPE_GENERIC_BOUND:
{
continue loop;
}
case ClassConstants.INTERNAL_TYPE_CLASS_START:
{
// We've found the start of an ordinary class name.
nestingLevel += 2;
isInnerClassName = false;
break loop;
}
case ClassConstants.INTERNAL_TYPE_CLASS_END:
{
nestingLevel -= 2;
break;
}
case ClassConstants.EXTERNAL_INNER_CLASS_SEPARATOR:
{
// We've found the start of an inner class name in a signature.
isInnerClassName = true;
break loop;
}
case ClassConstants.INTERNAL_TYPE_GENERIC_VARIABLE_START:
{
// We've found the start of a type identifier. Skip to the end.
while (descriptor.charAt(index++) != ClassConstants.INTERNAL_TYPE_CLASS_END);
break;
}
}
if (nestingLevel == 1 &&
descriptor.charAt(index) != ClassConstants.INTERNAL_TYPE_GENERIC_END)
{
// We're at the start of a type parameter. Skip to the start
// of the bounds.
while (descriptor.charAt(index++) != ClassConstants.INTERNAL_TYPE_GENERIC_BOUND);
}
}
return descriptor.substring(fluffStartIndex, index);
}
/**
* Returns the next class name from the descriptor.
*/
public String nextClassName()
{
int classNameStartIndex = index;
// Find the first token marking the end of a class name '<' or ';'.
loop: while (true)
{
switch (descriptor.charAt(index))
{
case ClassConstants.INTERNAL_TYPE_GENERIC_START:
case ClassConstants.INTERNAL_TYPE_CLASS_END:
case ClassConstants.EXTERNAL_INNER_CLASS_SEPARATOR:
{
break loop;
}
}
index++;
}
String className = descriptor.substring(classNameStartIndex, index);
// Recompose the inner class name if necessary.
accumulatedClassName = isInnerClassName ?
accumulatedClassName + ClassConstants.INTERNAL_INNER_CLASS_SEPARATOR + className :
className;
return accumulatedClassName;
}
/**
* Returns whether the most recently returned class name was a recomposed
* inner class name from a signature.
*/
public boolean isInnerClassName()
{
return isInnerClassName;
}
/**
* A main method for testing the class name enumeration.
*/
public static void main(String[] args)
{
try
{
for (int index = 0; index < args.length; index++)
{
String descriptor = args[index];
System.out.println("Descriptor ["+descriptor+"]");
DescriptorClassEnumeration enumeration = new DescriptorClassEnumeration(descriptor);
System.out.println(" Fluff: ["+enumeration.nextFluff()+"]");
while (enumeration.hasMoreClassNames())
{
System.out.println(" Name: ["+enumeration.nextClassName()+"]");
System.out.println(" Fluff: ["+enumeration.nextFluff()+"]");
}
}
}
catch (Exception ex)
{
ex.printStackTrace();
}
}
}
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