/*
 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */
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 JAXB1.0
 */
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 );
        }
    }
}