content: /*
   * 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.apache.ambari.server.api.predicate.operators;
  
  import org.apache.ambari.server.api.predicate.InvalidQueryException;
  
  /**
   * Factory of Logical Operators.
   */
  public class LogicalOperatorFactory {
    /**
     * Creates a logical operator based on the operator token.
     *
     * @param operator      string representation of operator
     * @param ctxPrecedence precedence value of current context
     *
     * @return a logical operator instance
     * @throws InvalidQueryException if the operator string is invalid
     */
    public static LogicalOperator createOperator(String operator, int ctxPrecedence)
        throws InvalidQueryException {
      if ("&".equals(operator)) {
        return new AndOperator(ctxPrecedence);
      } else if ("|".equals(operator)) {
        return new OrOperator(ctxPrecedence);
      } else if ("!".equals(operator)) {
        return new NotOperator(ctxPrecedence);
      } else {
        throw new RuntimeException("Invalid Logical Operator Type: " + operator);
      }
    }
  }
  