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/*
 * FindBugs - Find bugs in Java programs
 * Copyright (C) 2005-2006 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.detect;

import org.apache.bcel.Const;

import edu.umd.cs.findbugs.BugInstance;
import edu.umd.cs.findbugs.BugReporter;
import edu.umd.cs.findbugs.BytecodeScanningDetector;

public class FindEmptySynchronizedBlock extends BytecodeScanningDetector {

    BugReporter bugReporter;

    public FindEmptySynchronizedBlock(BugReporter bugReporter) {
        this.bugReporter = bugReporter;
    }

    @Override
    public void sawOpcode(int seen) {
        if (seen == Const.MONITOREXIT && (getPrevOpcode(2) == Const.MONITORENTER || getPrevOpcode(1) == Const.MONITORENTER)) {
            bugReporter.reportBug(new BugInstance(this, "ESync_EMPTY_SYNC", NORMAL_PRIORITY).addClassAndMethod(this)
                    .addSourceLine(this));
        }

    }
}