/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2003-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package javax.xml.bind.util;

import javax.xml.bind.ValidationEvent;
import javax.xml.bind.ValidationEventHandler;
import java.util.ArrayList;
import java.util.List;

/**
 * {@link javax.xml.bind.ValidationEventHandler ValidationEventHandler} 
 * implementation that collects all events.
 * 
 * <p>
 * To use this class, create a new instance and pass it to the setEventHandler
 * method of the Validator, Unmarshaller, Marshaller class.  After the call to 
 * validate or unmarshal completes, call the getEvents method to retrieve all 
 * the reported errors and warnings.
 *
 * @author <ul><li>Kohsuke Kawaguchi, Sun Microsystems, Inc.</li><li>Ryan Shoemaker, Sun Microsystems, Inc.</li><li>Joe Fialli, Sun Microsystems, Inc.</li></ul> 
 * @see javax.xml.bind.Validator
 * @see javax.xml.bind.ValidationEventHandler
 * @see javax.xml.bind.ValidationEvent
 * @see javax.xml.bind.ValidationEventLocator
 * @since 1.6, JAXB 1.0
 */
public class ValidationEventCollector implements ValidationEventHandler
{
    private final List<ValidationEvent> events = new ArrayList<ValidationEvent>();
     
    /**
     * Return an array of ValidationEvent objects containing a copy of each of 
     * the collected errors and warnings.
     * 
     * @return
     *      a copy of all the collected errors and warnings or an empty array
     *      if there weren't any
     */
    public ValidationEvent[] getEvents() {
        return events.toArray(new ValidationEvent[events.size()]);
    }
    
    /**
     * Clear all collected errors and warnings.
     */
    public void reset() {
        events.clear();
    }
    
    /**
     * Returns true if this event collector contains at least one 
     * ValidationEvent.
     *
     * @return true if this event collector contains at least one 
     *         ValidationEvent, false otherwise
     */
    public boolean hasEvents() {
        return !events.isEmpty();
    }
    
    public boolean handleEvent( ValidationEvent event ) {        
        events.add(event);

        boolean retVal = true;
        switch( event.getSeverity() ) {
            case ValidationEvent.WARNING:
                retVal = true; // continue validation
                break;
            case ValidationEvent.ERROR:
                retVal = true; // continue validation
                break;
            case ValidationEvent.FATAL_ERROR:
                retVal = false; // halt validation
                break;
            default:
                _assert( false, 
                         Messages.format( Messages.UNRECOGNIZED_SEVERITY,
                                 event.getSeverity() ) );
                break;
        }
        
        return retVal;
    }

    private static void _assert( boolean b, String msg ) {
        if( !b ) {
            throw new InternalError( msg );
        }
    }
}
