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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.shrink;
import proguard.classfile.*;
import proguard.classfile.visitor.*;
/**
* This class can be used as a mark when keeping classes, class members, and
* other elements. It can be certain or preliminary. It also contains additional
* information about the reasons why an element is being kept.
*
* @see ClassShrinker
*
* @author Eric Lafortune
*/
final class ShortestUsageMark
{
private final boolean certain;
private final String reason;
private final int depth;
private Clazz clazz;
private Member member;
/**
* Creates a new certain ShortestUsageMark.
* @param reason the reason for this mark.
*/
public ShortestUsageMark(String reason)
{
this.certain = true;
this.reason = reason;
this.depth = 0;
}
/**
* Creates a new certain ShortestUsageMark.
* @param previousUsageMark the previous mark to which this one is linked.
* @param reason the reason for this mark.
* @param clazz the class causing this mark.
*/
public ShortestUsageMark(ShortestUsageMark previousUsageMark,
String reason,
int cost,
Clazz clazz)
{
this(previousUsageMark, reason, cost, clazz, null);
}
/**
* Creates a new certain ShortestUsageMark.
* @param previousUsageMark the previous mark to which this one is linked.
* @param reason the reason for this mark.
* @param clazz the class causing this mark.
* @param member the member in the above class causing this mark.
* @param cost the added cost of following this path.
*/
public ShortestUsageMark(ShortestUsageMark previousUsageMark,
String reason,
int cost,
Clazz clazz,
Member member)
{
this.certain = true;
this.reason = reason;
this.depth = previousUsageMark.depth + cost;
this.clazz = clazz;
this.member = member;
}
/**
* Creates a new ShortestUsageMark, based on another mark.
* @param otherUsageMark the other mark, whose properties will be copied.
* @param certain specifies whether this is a certain mark.
*/
public ShortestUsageMark(ShortestUsageMark otherUsageMark,
boolean certain)
{
this.certain = certain;
this.reason = otherUsageMark.reason;
this.depth = otherUsageMark.depth;
this.clazz = otherUsageMark.clazz;
this.member = otherUsageMark.member;
}
/**
* Returns whether this is a certain mark.
*/
public boolean isCertain()
{
return certain;
}
/**
* Returns the reason for this mark.
*/
public String getReason()
{
return reason;
}
/**
* Returns whether this mark has a shorter chain of reasons than the
* given mark.
*/
public boolean isShorter(ShortestUsageMark otherUsageMark)
{
return this.depth < otherUsageMark.depth;
}
/**
* Returns whether this is mark is caused by the given class.
*/
public boolean isCausedBy(Clazz clazz)
{
return clazz.equals(this.clazz);
}
/**
* Applies the given class visitor to this mark's class, if any,
* and if this mark doesn't have a member.
*/
public void acceptClassVisitor(ClassVisitor classVisitor)
{
if (clazz != null &&
member == null)
{
clazz.accept(classVisitor);
}
}
/**
* Applies the given class visitor to this mark's member, if any.
*/
public void acceptMemberVisitor(MemberVisitor memberVisitor)
{
if (clazz != null &&
member != null)
{
member.accept(clazz, memberVisitor);
}
}
// Implementations for Object.
public String toString()
{
return "certain=" + certain + ", depth="+depth+": " +
reason +
(clazz != null ? clazz.getName() : "(none)") + ": " +
(member != null ? member.getName(clazz) : "(none)");
}
}
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