jreversepro.revengine.JBranchComparator Maven / Gradle / Ivy
/*
@(#)JBranchComparator.java JReversePro - Java Decompiler / Disassembler.
* Copyright (C) 2000 2001 2002 Karthik Kumar.
* EMail: [email protected]
*
* 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 jreversepro.revengine;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Comparator;
/**
* Comparator for comparing two branch entries.
*
* @author Karthik Kumar.
*/
public class JBranchComparator implements Comparator {
private static final Logger log = LoggerFactory.getLogger(JBranchComparator.class);
/**
* Method to compare two JBranchComparator objects
*
* @param o1 First Object to be compared.
* @param o2 Second object to be compared.
* @return -1 if First branch overlaps Second branch,
* 1 if first branch doesnt overlap and exactly outside the second
* branch.
*/
public int compare(Object o1, Object o2) {
if (!(o1 instanceof JBranchEntry) || !(o2 instanceof JBranchEntry)) {
log.error("Not a BranchEntry");
return 0;
}
try {
JBranchEntry e1 = (JBranchEntry) o1;
JBranchEntry e2 = (JBranchEntry) o2;
int exec1 = e1.getStartExecPc();
int exec2 = e2.getStartExecPc();
int end1 = e1.getEndBlockPc();
int end2 = e2.getEndBlockPc();
if (exec1 < exec2) {
return -1;
} else if (exec1 == exec2) {
if (end1 > end2) {
return -1;
} else {
return 1;
}
} else {
return 1;
}
} catch (RevEngineException ree) {
return -1;
}
}
/**
* @param obj R.H.S object to be compared.
* @return true, if both are equal.
* false, otherwise.
*/
public boolean equals(Object obj) {
return (obj instanceof JBranchEntry);
}
}