/*
* FindBugs - Find bugs in Java programs
* Copyright (C) 2008, University of Maryland
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package edu.umd.cs.findbugs.util;
import org.apache.bcel.generic.ReferenceType;
import org.apache.bcel.generic.Type;
import edu.umd.cs.findbugs.ba.ch.Subtypes2;
import edu.umd.cs.findbugs.bcel.BCELUtil;
import edu.umd.cs.findbugs.classfile.ClassDescriptor;
import edu.umd.cs.findbugs.classfile.Global;
import edu.umd.cs.findbugs.classfile.IAnalysisCache;
/**
* Type matcher that determines if a candidate Type is a subtype of a given
* Type.
*
* @author David Hovemeyer
*/
public class SubtypeTypeMatcher implements TypeMatcher {
private final ReferenceType supertype;
/**
* Constructor.
*
* @param supertype
* a ReferenceType: this TypeMatcher will test whether or not
* candidate Types are subtypes of this Type
*/
public SubtypeTypeMatcher(ReferenceType supertype) {
this.supertype = supertype;
}
/**
* Constructor.
*
* @param classDescriptor
* a ClassDescriptor naming a class: this TypeMatcher will test
* whether or not candidate Types are subtypes of the class
*/
public SubtypeTypeMatcher(ClassDescriptor classDescriptor) {
this(BCELUtil.getObjectTypeInstance(classDescriptor.toDottedClassName()));
}
@Override
public boolean matches(Type t) {
if (!(t instanceof ReferenceType)) {
return false;
}
IAnalysisCache analysisCache = Global.getAnalysisCache();
Subtypes2 subtypes2 = analysisCache.getDatabase(Subtypes2.class);
try {
return subtypes2.isSubtype((ReferenceType) t, supertype);
} catch (ClassNotFoundException e) {
analysisCache.getErrorLogger().reportMissingClass(e);
return false;
}
}
@Override
public String toString() {
return "+" + supertype.toString();
}
}