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.clause;
  
  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.AbstractClause;
  import org.apache.asterix.lang.common.base.Expression;
  import org.apache.asterix.lang.common.expression.VariableExpr;
  import org.apache.asterix.lang.common.visitor.base.ILangVisitor;
  import org.apache.asterix.lang.sqlpp.visitor.base.ISqlppVisitor;
  
  public class FromTerm extends AbstractClause {
      private Expression leftExpr;
      private VariableExpr leftVar;
      private VariableExpr posVar;
      private List<AbstractBinaryCorrelateClause> correlateClauses = new ArrayList<>();
  
      public FromTerm(Expression leftExpr, VariableExpr leftVar, VariableExpr posVar,
              List<AbstractBinaryCorrelateClause> correlateClauses) {
          this.leftExpr = leftExpr;
          this.leftVar = leftVar;
          this.posVar = posVar;
          if (correlateClauses != null) {
              this.correlateClauses.addAll(correlateClauses);
          }
      }
  
      @Override
      public <R, T> R accept(ILangVisitor<R, T> visitor, T arg) throws CompilationException {
          return ((ISqlppVisitor<R, T>) visitor).visit(this, arg);
      }
  
      @Override
      public ClauseType getClauseType() {
          return ClauseType.FROM_TERM;
      }
  
      public Expression getLeftExpression() {
          return leftExpr;
      }
  
      public void setLeftExpression(Expression expr) {
          this.leftExpr = expr;
      }
  
      public VariableExpr getLeftVariable() {
          return leftVar;
      }
  
      public VariableExpr getPositionalVariable() {
          return posVar;
      }
  
      public boolean hasCorrelateClauses() {
          return correlateClauses != null && !correlateClauses.isEmpty();
      }
  
      public List<AbstractBinaryCorrelateClause> getCorrelateClauses() {
          return correlateClauses;
      }
  
      public boolean hasPositionalVariable() {
          return posVar != null;
      }
  
      @Override
      public String toString() {
          return String.valueOf(leftExpr) + " AS " + leftVar;
      }
  
      @Override
      public int hashCode() {
          return Objects.hash(correlateClauses, leftExpr, leftVar, posVar);
      }
  
      @Override
      public boolean equals(Object object) {
          if (this == object) {
              return true;
          }
          if (!(object instanceof FromTerm)) {
              return false;
          }
          FromTerm target = (FromTerm) object;
          return Objects.equals(correlateClauses, target.correlateClauses) && Objects.equals(leftExpr, target.leftExpr)
                  && Objects.equals(leftVar, target.leftVar) && Objects.equals(posVar, target.posVar);
      }
  }
  