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.asterix.lang.common.base;
  
  import org.apache.asterix.common.exceptions.CompilationException;
  import org.apache.asterix.common.exceptions.ErrorCode;
  import org.apache.asterix.lang.common.visitor.base.ILangVisitor;
  
  public abstract class AbstractExtensionClause extends AbstractClause {
      /**
       * Parent languages should handle extension functionality via a new method in {@link IVisitorExtension}.
       */
      @Override
      public <R, T> R accept(ILangVisitor<R, T> visitor, T arg) throws CompilationException {
          throw new CompilationException(ErrorCode.COMPILATION_ILLEGAL_STATE, getSourceLocation(),
                  "Unhandled dispatch to an extension clause node!");
      }
  
      public abstract IVisitorExtension getVisitorExtension();
  
      @Override
      public final ClauseType getClauseType() {
          return ClauseType.EXTENSION;
      }
  }
  