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.sqlpp.expression;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  
  import org.apache.asterix.common.exceptions.CompilationException;
  import org.apache.asterix.lang.common.base.AbstractExpression;
  import org.apache.asterix.lang.common.clause.LetClause;
  import org.apache.asterix.lang.common.clause.LimitClause;
  import org.apache.asterix.lang.common.clause.OrderbyClause;
  import org.apache.asterix.lang.common.visitor.base.ILangVisitor;
  import org.apache.asterix.lang.sqlpp.clause.SelectSetOperation;
  import org.apache.asterix.lang.sqlpp.visitor.base.ISqlppVisitor;
  
  public class SelectExpression extends AbstractExpression {
  
      private List<LetClause> letList = new ArrayList<>();
      private SelectSetOperation selectSetOperation;
      private OrderbyClause orderbyClause;
      private LimitClause limitClause;
      private boolean subquery;
  
      public SelectExpression(List<LetClause> letList, SelectSetOperation selectSetOperation, OrderbyClause orderbyClause,
              LimitClause limitClause, boolean subquery) {
          if (letList != null) {
              this.letList.addAll(letList);
          }
          this.selectSetOperation = selectSetOperation;
          this.orderbyClause = orderbyClause;
          this.limitClause = limitClause;
          this.subquery = subquery;
      }
  
      @Override
      public <R, T> R accept(ILangVisitor<R, T> visitor, T arg) throws CompilationException {
          return ((ISqlppVisitor<R, T>) visitor).visit(this, arg);
      }
  
      @Override
      public Kind getKind() {
          return Kind.SELECT_EXPRESSION;
      }
  
      public List<LetClause> getLetList() {
          return letList;
      }
  
      public SelectSetOperation getSelectSetOperation() {
          return selectSetOperation;
      }
  
      public void setOrderbyClause(OrderbyClause orderbyClause) {
          this.orderbyClause = orderbyClause;
      }
  
      public OrderbyClause getOrderbyClause() {
          return orderbyClause;
      }
  
      public void setLimitClause(LimitClause limitClause) {
          this.limitClause = limitClause;
      }
  
      public LimitClause getLimitClause() {
          return limitClause;
      }
  
      public boolean hasOrderby() {
          return orderbyClause != null;
      }
  
      public boolean hasLimit() {
          return limitClause != null;
      }
  
      public boolean hasLetClauses() {
          return letList != null && !letList.isEmpty();
      }
  
      public boolean isSubquery() {
          return subquery;
      }
  
      public void setSubquery(boolean setSubquery) {
          subquery = setSubquery;
      }
  
      @Override
      public int hashCode() {
          return Objects.hash(letList, limitClause, orderbyClause, selectSetOperation, subquery);
      }
  
      @Override
      @SuppressWarnings("squid:S1067") // expressions should not be too complex
      public boolean equals(Object object) {
          if (this == object) {
              return true;
          }
          if (!(object instanceof SelectExpression)) {
              return false;
          }
          SelectExpression target = (SelectExpression) object;
          return Objects.equals(letList, target.letList) && Objects.equals(limitClause, target.limitClause)
                  && Objects.equals(orderbyClause, target.orderbyClause) && subquery == target.subquery
                  && Objects.equals(selectSetOperation, target.selectSetOperation);
      }
  
      @Override
      public String toString() {
          StringBuilder sb = new StringBuilder();
          sb.append(subquery ? "(" : "");
          if (this.hasLetClauses()) {
              sb.append(letList.toString());
          }
          sb.append(selectSetOperation);
          if (hasOrderby()) {
              sb.append(orderbyClause);
          }
          if (hasLimit()) {
              sb.append(limitClause);
          }
          sb.append(subquery ? ")" : "");
          return sb.toString();
      }
  }
  