jpa/plugins/org.eclipse.jpt.jpa.core/src/org/eclipse/jpt/jpa/core/internal/context/JptValidator.java

/*******************************************************************************
 *  Copyright (c) 2010  Oracle. 
 *  All rights reserved.  This program and the accompanying materials are 
 *  made available under the terms of the Eclipse Public License v1.0 which 
 *  accompanies this distribution, and is available at 
 *  http://www.eclipse.org/legal/epl-v10.html
 *  
 *  Contributors: 
 *  	Oracle - initial API and implementation
 *******************************************************************************/
package org.eclipse.jpt.jpa.core.internal.context;

import java.util.List;
import org.eclipse.jpt.common.utility.internal.StringTools;
import org.eclipse.wst.validation.internal.provisional.core.IMessage;
import org.eclipse.wst.validation.internal.provisional.core.IReporter;

public interface JptValidator
{
	/**
	 * Return a boolean used to determine whether to continue validating
	 */
	boolean validate(List<IMessage> messages, IReporter reporter);

	final class Null
		implements JptValidator
	{
		private static final JptValidator INSTANCE = new Null();
		public static JptValidator instance() {
			return INSTANCE;
		}
		// ensure single instance
		private Null() {
			super();
		}
		public boolean validate(List<IMessage> messages, IReporter reporter) {
			return true;  // continue validating
		}
		@Override
		public String toString() {
			return StringTools.buildSingletonToString(this);
		}
	}
}