/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.netbeans.modules.j2ee.persistence.dd;

import java.util.Arrays;
import java.util.Set;
import java.util.TreeSet;
import org.openide.util.NbBundle;

/**
 * Utility class that allows checking whether given string is 
 * <em>Java Persistence API QL keyword</em>
 * and thus cannot be used as a name for a persistent class or field.
 * @author Tomasz Slota
 */
public class JavaPersistenceQLKeywords {
    
    private static Set<String> keywords ;
    
    private JavaPersistenceQLKeywords() {}
    
    static{
        String rawKeywords = NbBundle.getBundle(JavaPersistenceQLKeywords.class).getString("JavaPersistenceQLKeywords");
        keywords = new TreeSet<String>(Arrays.asList(rawKeywords.split(","))); //NOI18N
    }
    
    public static boolean isKeyword(String string){
        if (string == null){
            throw new NullPointerException();
        }
        
        boolean result = keywords.contains(string.toUpperCase());
        return result;
    }
}
