/* Soot - a J*va Optimization Framework
 * Copyright (C) 1997-1999 Raja Vallee-Rai
 *
 * 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 soot.jimple.validation;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

import soot.Body;
import soot.Trap;
import soot.Unit;
import soot.jimple.CaughtExceptionRef;
import soot.jimple.IdentityStmt;
import soot.validation.BodyValidator;
import soot.validation.ValidationException;

/**
 * This validator checks whether the jimple traps are correct.
 * It does not perform the same checks as {@link soot.validation.TrapsValidator}
 * 
 * @see JimpleTrapValidator#validate(Body, List)
 * @author Marc Miltenberger
 */
public enum JimpleTrapValidator implements BodyValidator {
	INSTANCE;

	public static JimpleTrapValidator v() {
		return INSTANCE;
	}

	@Override
	/**
	 * Checks whether all Caught-Exception-References are associated to traps.
	 */
	public void validate(Body body, List<ValidationException> exception) {
		Set<Unit> caughtUnits = new HashSet<Unit>();
		for (Trap trap : body.getTraps()) {
			caughtUnits.add(trap.getHandlerUnit());
			
			if (!(trap.getHandlerUnit() instanceof IdentityStmt))
				exception.add(new ValidationException(trap, "Trap handler does start with caught "
						+ "exception reference"));
			else {
				IdentityStmt is = (IdentityStmt) trap.getHandlerUnit();
				if (!(is.getRightOp() instanceof CaughtExceptionRef))
					exception.add(new ValidationException(trap, "Trap handler does start with caught "
							+ "exception reference"));
			}
		}
		for (Unit u : body.getUnits()) {
			if (u instanceof IdentityStmt) {
				IdentityStmt id = (IdentityStmt) u;
				if (id.getRightOp() instanceof CaughtExceptionRef) {
					if (!caughtUnits.contains(id)) 
					{
						exception
						.add(new ValidationException(
								id,
								"Could not find a corresponding trap using this statement as handler",
								"Body of method "
										+ body.getMethod()
												.getSignature()
										+ " contains a caught exception reference, but not a corresponding trap using this statement as handler"));						
					}
				}
			}
		}
	}

	@Override
	public boolean isBasicValidator() {
		return true;
	}
}

@@ -1924,32 +1924,36 @@
 ap handler does 
+not 
 start with caugh
@@ -2185,16 +2185,20 @@
 er does 
+not 
 start wi

Fix typo in exception message