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.expression;
  
  import java.util.Objects;
  
  import org.apache.asterix.common.exceptions.CompilationException;
  import org.apache.asterix.lang.common.base.Expression;
  import org.apache.asterix.lang.common.visitor.base.ILangVisitor;
  
  public class IndexAccessor extends AbstractAccessor {
  
      public enum IndexKind {
          ELEMENT,
          ANY,
          STAR
      }
  
      private IndexKind indexKind;
  
      private Expression indexExpr;
  
      public IndexAccessor(Expression expr, IndexKind indexKind, Expression indexExpr) {
          super(expr);
          if (indexKind != IndexKind.ELEMENT && indexExpr != null) {
              throw new IllegalArgumentException(indexExpr.toString());
          }
          this.indexKind = Objects.requireNonNull(indexKind);
          this.indexExpr = indexExpr;
      }
  
      public IndexKind getIndexKind() {
          return indexKind;
      }
  
      public void setIndexKind(IndexKind indexKind) {
          this.indexKind = indexKind;
      }
  
      public Expression getIndexExpr() {
          return indexExpr;
      }
  
      public void setIndexExpr(Expression indexExpr) {
          this.indexExpr = indexExpr;
      }
  
      @Override
      public Kind getKind() {
          return Kind.INDEX_ACCESSOR_EXPRESSION;
      }
  
      @Override
      public <R, T> R accept(ILangVisitor<R, T> visitor, T arg) throws CompilationException {
          return visitor.visit(this, arg);
      }
  
      @Override
      public int hashCode() {
          return 31 * super.hashCode() + Objects.hash(indexKind, indexExpr);
      }
  
      @Override
      public boolean equals(Object object) {
          if (this == object) {
              return true;
          }
          if (!(object instanceof IndexAccessor)) {
              return false;
          }
          IndexAccessor target = (IndexAccessor) object;
          return super.equals(target) && indexKind == target.indexKind && Objects.equals(indexExpr, target.indexExpr);
      }
  
      @Override
      public String toString() {
          return expr + "[" + indexKind + '(' + indexExpr + ")]";
      }
  }
  