edu.umd.cs.findbugs.ba.type.TopType Maven / Gradle / Ivy
/*
* Bytecode Analysis Framework
* Copyright (C) 2003,2004 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.ba.type;
import org.apache.bcel.generic.Type;
/**
* Special "top" type. It is the identity element for the type merge operation.
*
* @author David Hovemeyer
* @see TypeAnalysis
* @see TypeFrame
* @see TypeMerger
*/
public class TopType extends Type implements ExtendedTypes {
/**
*
*/
private static final long serialVersionUID = 1L;
private static final Type theInstance = new TopType();
private TopType() {
super(T_TOP, "");
}
@Override
public int hashCode() {
return System.identityHashCode(this);
}
@Override
public boolean equals(Object o) {
return o == this;
}
/**
* Get the single instance of the top type.
*/
public static Type instance() {
return theInstance;
}
}