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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.shrink;
import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.util.*;
import proguard.classfile.visitor.*;
import java.io.PrintStream;
/**
* This ClassVisitor prints out the classes and class members that have been
* marked as being used (or not used).
*
* @see UsageMarker
*
* @author Eric Lafortune
*/
public class UsagePrinter
extends SimplifiedVisitor
implements ClassVisitor,
MemberVisitor,
AttributeVisitor
{
private final UsageMarker usageMarker;
private final boolean printUnusedItems;
private final PrintStream ps;
// A field to remember the class name, if a header is needed for class members.
private String className;
/**
* Creates a new UsagePrinter that prints to <code>System.out</code>.
* @param usageMarker the usage marker that was used to mark the
* classes and class members.
* @param printUnusedItems a flag that indicates whether only unused items
* should be printed, or alternatively, only used
* items.
*/
public UsagePrinter(UsageMarker usageMarker,
boolean printUnusedItems)
{
this(usageMarker, printUnusedItems, System.out);
}
/**
* Creates a new UsagePrinter that prints to the given stream.
* @param usageMarker the usage marker that was used to mark the
* classes and class members.
* @param printUnusedItems a flag that indicates whether only unused items
* should be printed, or alternatively, only used
* items.
* @param printStream the stream to which to print.
*/
public UsagePrinter(UsageMarker usageMarker,
boolean printUnusedItems,
PrintStream printStream)
{
this.usageMarker = usageMarker;
this.printUnusedItems = printUnusedItems;
this.ps = printStream;
}
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
if (usageMarker.isUsed(programClass))
{
if (printUnusedItems)
{
className = programClass.getName();
programClass.fieldsAccept(this);
programClass.methodsAccept(this);
className = null;
}
else
{
ps.println(ClassUtil.externalClassName(programClass.getName()));
}
}
else
{
if (printUnusedItems)
{
ps.println(ClassUtil.externalClassName(programClass.getName()));
}
}
}
// Implementations for MemberVisitor.
public void visitProgramField(ProgramClass programClass, ProgramField programField)
{
if (usageMarker.isUsed(programField) ^ printUnusedItems)
{
printClassNameHeader();
ps.println(" " +
ClassUtil.externalFullFieldDescription(
programField.getAccessFlags(),
programField.getName(programClass),
programField.getDescriptor(programClass)));
}
}
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
if (usageMarker.isUsed(programMethod) ^ printUnusedItems)
{
printClassNameHeader();
ps.print(" ");
programMethod.attributesAccept(programClass, this);
ps.println(ClassUtil.externalFullMethodDescription(
programClass.getName(),
programMethod.getAccessFlags(),
programMethod.getName(programClass),
programMethod.getDescriptor(programClass)));
}
}
// Implementations for AttributeVisitor.
public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
{
codeAttribute.attributesAccept(clazz, method, this);
}
public void visitLineNumberTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LineNumberTableAttribute lineNumberTableAttribute)
{
ps.print(lineNumberTableAttribute.getLowestLineNumber() + ":" +
lineNumberTableAttribute.getHighestLineNumber() + ":");
}
// Small utility methods.
/**
* Prints the class name field. The field is then cleared, so it is not
* printed again.
*/
private void printClassNameHeader()
{
if (className != null)
{
ps.println(ClassUtil.externalClassName(className) + ":");
className = null;
}
}
}
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