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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.io;
import proguard.classfile.*;
import java.io.*;
/**
* This DataEntryReader writes the resource data entries that it reads to a
* given DataEntryWriter, updating their contents based on the renamed classes
* in the given ClassPool.
*
* @author Eric Lafortune
*/
public class DataEntryRewriter extends DataEntryCopier
{
private final ClassPool classPool;
/**
* Creates a new DataEntryRewriter.
*/
public DataEntryRewriter(ClassPool classPool,
DataEntryWriter dataEntryWriter)
{
super(dataEntryWriter);
this.classPool = classPool;
}
// Implementations for DataEntryCopier.
protected void copyData(InputStream inputStream,
OutputStream outputStream)
throws IOException
{
Reader reader = new BufferedReader(new InputStreamReader(inputStream));
Writer writer = new BufferedWriter(new OutputStreamWriter(outputStream));
copyData(reader, writer);
writer.flush();
outputStream.flush();
}
/**
* Copies all data that it can read from the given reader to the given
* writer.
*/
protected void copyData(Reader reader,
Writer writer)
throws IOException
{
StringBuffer word = new StringBuffer();
while (true)
{
int i = reader.read();
if (i < 0)
{
break;
}
// Is the character part of a word?
char c = (char)i;
if (Character.isJavaIdentifierPart(c) ||
c == '.' ||
c == '-')
{
// Collect the characters in this word.
word.append(c);
}
else
{
// Write out the updated word, if any.
writeUpdatedWord(writer, word.toString());
word.setLength(0);
// Write out the character that terminated it.
writer.write(c);
}
}
// Write out the final word.
writeUpdatedWord(writer, word.toString());
}
// Small utility methods.
/**
* Writes the given word to the given writer, after having adapted it,
* based on the renamed class names.
*/
private void writeUpdatedWord(Writer writer, String word)
throws IOException
{
if (word.length() > 0)
{
String newWord = word;
boolean containsDots = word.indexOf('.') >= 0;
// Replace dots by forward slashes.
String className = containsDots ?
word.replace('.', ClassConstants.PACKAGE_SEPARATOR) :
word;
// Find the class corrsponding to the word.
Clazz clazz = classPool.getClass(className);
if (clazz != null)
{
// Update the word if necessary.
String newClassName = clazz.getName();
if (!className.equals(newClassName))
{
// Replace forward slashes by dots.
newWord = containsDots ?
newClassName.replace(ClassConstants.PACKAGE_SEPARATOR, '.') :
newClassName;
}
}
writer.write(newWord);
}
}
}
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