DontCatchIllegalMonitorStateException.java

/*
 * FindBugs - Find bugs in Java programs
 * Copyright (C) 2003-2005 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 java.util.HashSet;
import java.util.Set;

import org.apache.bcel.classfile.CodeException;
import org.apache.bcel.classfile.ExceptionTable;

import edu.umd.cs.findbugs.BugInstance;
import edu.umd.cs.findbugs.BugReporter;
import edu.umd.cs.findbugs.Detector;
import edu.umd.cs.findbugs.SystemProperties;
import edu.umd.cs.findbugs.ba.ClassContext;
import edu.umd.cs.findbugs.visitclass.PreorderVisitor;

public class DontCatchIllegalMonitorStateException extends PreorderVisitor implements Detector {

    private static final boolean DEBUG = SystemProperties.getBoolean("dcimse.debug");

    BugReporter bugReporter;

    Set<String> msgs = null;

    ClassContext classContext;

    public DontCatchIllegalMonitorStateException(BugReporter bugReporter) {
        this.bugReporter = bugReporter;
        if (DEBUG)
            msgs = new HashSet<String>();
    }

    @Override
    public void visit(ExceptionTable obj) {
        if (DEBUG) {
            String names[] = obj.getExceptionNames();
            for (String name : names)
                if (name.equals("java.lang.Exception") || name.equals("java.lang.Throwable"))
                    System.out.println(name + " thrown by " + getFullyQualifiedMethodName());
        }
    }

    @Override
    public void visit(CodeException obj) {
        int type = obj.getCatchType();
        if (type == 0)
            return;
        String name = getConstantPool().constantToString(getConstantPool().getConstant(type));
        if (DEBUG) {
            String msg = "Catching " + name + " in " + getFullyQualifiedMethodName();
            if (msgs.add(msg))
                System.out.println(msg);
        }
        if (name.equals("java.lang.IllegalMonitorStateException"))
            bugReporter.reportBug(new BugInstance(this, "IMSE_DONT_CATCH_IMSE", HIGH_PRIORITY).addClassAndMethod(this)
                    .addSourceLine(this.classContext, this, obj.getHandlerPC()));

    }

    public void visitClassContext(ClassContext classContext) {
        this.classContext = classContext;
        classContext.getJavaClass().accept(this);
    }

    public void report() {
    }
}