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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2014 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.*;
/**
* An <code>ExternalTypeEnumeration</code> provides an enumeration of all
* types listed in a given external descriptor string. The method name can
* be retrieved separately.
* <p>
* A <code>ExternalTypeEnumeration</code> object can be reused for processing
* different subsequent descriptors, by means of the <code>setDescriptor</code>
* method.
*
* @author Eric Lafortune
*/
public class ExternalTypeEnumeration
{
private String descriptor;
private int index;
public ExternalTypeEnumeration(String descriptor)
{
setDescriptor(descriptor);
}
ExternalTypeEnumeration()
{
}
void setDescriptor(String descriptor)
{
this.descriptor = descriptor;
reset();
}
public void reset()
{
index = descriptor.indexOf(JavaConstants.METHOD_ARGUMENTS_OPEN) + 1;
if (index < 1)
{
throw new IllegalArgumentException("Missing opening parenthesis in descriptor ["+descriptor+"]");
}
}
public boolean hasMoreTypes()
{
return index < descriptor.length() - 1;
}
public String nextType()
{
int startIndex = index;
// Find the next separating comma.
index = descriptor.indexOf(JavaConstants.METHOD_ARGUMENTS_SEPARATOR,
startIndex);
// Otherwise find the closing parenthesis.
if (index < 0)
{
index = descriptor.indexOf(JavaConstants.METHOD_ARGUMENTS_CLOSE,
startIndex);
if (index < 0)
{
throw new IllegalArgumentException("Missing closing parenthesis in descriptor ["+descriptor+"]");
}
}
return descriptor.substring(startIndex, index++).trim();
}
public String methodName()
{
return descriptor.substring(0, descriptor.indexOf(JavaConstants.METHOD_ARGUMENTS_OPEN)).trim();
}
}
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