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/* $Id: ShortestUsagePrinter.java,v 1.3 2005/06/11 13:21:35 eric Exp $
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* ProGuard -- shrinking, optimization, and obfuscation of Java class files.
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* Copyright (c) 2002-2005 Eric Lafortune (eric@graphics.cornell.edu)
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package proguard.shrink;
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import proguard.classfile.*;
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import proguard.classfile.util.*;
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import proguard.classfile.visitor.*;
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* This ClassFileVisitor and MemberInfoVisitor prints out the reasons why
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* class files and class members have been marked as being used.
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* @author Eric Lafortune
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public class ShortestUsagePrinter
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implements ClassFileVisitor,
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private ShortestUsageMarker shortestUsageMarker;
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private boolean verbose;
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private PrintStream ps;
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* Creates a new UsagePrinter that prints verbosely to <code>System.out</code>.
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* @param shortestUsageMarker the usage marker that was used to mark the
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* classes and class members.
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public ShortestUsagePrinter(ShortestUsageMarker shortestUsageMarker)
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this(shortestUsageMarker, true);
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* Creates a new UsagePrinter that prints to the given stream.
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* @param shortestUsageMarker the usage marker that was used to mark the
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* classes and class members.
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* @param verbose specifies whether the output should be verbose.
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public ShortestUsagePrinter(ShortestUsageMarker shortestUsageMarker,
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this(shortestUsageMarker, verbose, System.out);
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* Creates a new UsagePrinter that prints to the given stream.
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* @param shortestUsageMarker the usage marker that was used to mark the
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* classes and class members.
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* @param verbose specifies whether the output should be verbose.
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* @param printStream the stream to which to print.
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public ShortestUsagePrinter(ShortestUsageMarker shortestUsageMarker,
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PrintStream printStream)
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this.shortestUsageMarker = shortestUsageMarker;
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this.verbose = verbose;
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this.ps = printStream;
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// Implementations for ClassFileVisitor.
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public void visitProgramClassFile(ProgramClassFile programClassFile)
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// Print the name of this class file.
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ps.println(ClassUtil.externalClassName(programClassFile.getName()));
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// Print the reason for keeping this class file.
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printReason(programClassFile);
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public void visitLibraryClassFile(LibraryClassFile libraryClassFile)
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// Print the name of this class file.
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ps.println(ClassUtil.externalClassName(libraryClassFile.getName()));
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// Print the reason for keeping this class file.
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ps.println(" is a library class.\n");
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// Implementations for MemberInfoVisitor.
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public void visitProgramFieldInfo(ProgramClassFile programClassFile, ProgramFieldInfo programFieldInfo)
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// Print the name of this field.
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String name = programFieldInfo.getName(programClassFile);
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String type = programFieldInfo.getDescriptor(programClassFile);
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ps.println(ClassUtil.externalClassName(programClassFile.getName()) +
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": " + ClassUtil.externalFullFieldDescription(0, name, type):
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lineNumberRange(programClassFile, programFieldInfo));
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// Print the reason for keeping this method.
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printReason(programFieldInfo);
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public void visitProgramMethodInfo(ProgramClassFile programClassFile, ProgramMethodInfo programMethodInfo)
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// Print the name of this method.
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String name = programMethodInfo.getName(programClassFile);
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String type = programMethodInfo.getDescriptor(programClassFile);
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ps.println(ClassUtil.externalClassName(programClassFile.getName()) +
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": " + ClassUtil.externalFullMethodDescription(programClassFile.getName(), 0, name, type):
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lineNumberRange(programClassFile, programMethodInfo));
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// Print the reason for keeping this method.
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printReason(programMethodInfo);
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public void visitLibraryFieldInfo(LibraryClassFile libraryClassFile, LibraryFieldInfo libraryFieldInfo)
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// Print the name of this field.
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String name = libraryFieldInfo.getName(libraryClassFile);
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String type = libraryFieldInfo.getDescriptor(libraryClassFile);
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ps.println(ClassUtil.externalClassName(libraryClassFile.getName()) +
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": " + ClassUtil.externalFullFieldDescription(0, name, type):
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// Print the reason for keeping this field.
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ps.println(" is a library field.\n");
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public void visitLibraryMethodInfo(LibraryClassFile libraryClassFile, LibraryMethodInfo libraryMethodInfo)
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// Print the name of this method.
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String name = libraryMethodInfo.getName(libraryClassFile);
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String type = libraryMethodInfo.getDescriptor(libraryClassFile);
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ps.println(ClassUtil.externalClassName(libraryClassFile.getName()) +
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": " + ClassUtil.externalFullMethodDescription(libraryClassFile.getName(), 0, name, type):
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// Print the reason for keeping this method.
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ps.println(" is a library method.\n");
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// Small utility methods.
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private void printReason(VisitorAccepter visitorAccepter)
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if (shortestUsageMarker.isUsed(visitorAccepter))
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ShortestUsageMark shortestUsageMark = shortestUsageMarker.getShortestUsageMark(visitorAccepter);
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// Print the reason for keeping this class file.
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ps.print(" " + shortestUsageMark.getReason());
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// Print the class or method that is responsible, with its reasons.
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shortestUsageMark.acceptClassFileVisitor(this);
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shortestUsageMark.acceptMethodInfoVisitor(this);
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ps.println(" is not being kept.\n");
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* Returns the line number range of the given class member, followed by a
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* colon, or just an empty String if no range is available.
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private static String lineNumberRange(ProgramClassFile programClassFile, ProgramMemberInfo programMemberInfo)
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String range = programMemberInfo.getLineNumberRange(programClassFile);
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return range != null ?
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(" (" + range + ")") :
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src/proguard/shrink/ShortestUsagePrinter.java
