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.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.base.Expression;
  import org.apache.asterix.lang.common.struct.OperatorType;
  import org.apache.asterix.lang.common.visitor.base.ILangVisitor;
  
  public class OperatorExpr extends AbstractExpression {
      private List<Expression> exprList;
      private List<OperatorType> opList;
      private boolean currentop;
  
      public OperatorExpr() {
          super();
          exprList = new ArrayList<>();
          opList = new ArrayList<>();
      }
  
      public OperatorExpr(List<Expression> exprList, List<OperatorType> opList, boolean currentop) {
          this.exprList = exprList;
          this.opList = opList;
          this.currentop = currentop;
      }
  
      public boolean isCurrentop() {
          return currentop;
      }
  
      public void setCurrentop(boolean currentop) {
          this.currentop = currentop;
      }
  
      public List<Expression> getExprList() {
          return exprList;
      }
  
      public List<OperatorType> getOpList() {
          return opList;
      }
  
      public void setExprList(List<Expression> exprList) {
          this.exprList = exprList;
      }
  
      public void addOperand(Expression operand) {
          exprList.add(operand);
      }
  
      public static boolean opIsComparison(OperatorType t) {
          switch (t) {
              case EQ:
              case NEQ:
              case GT:
              case GE:
              case LT:
              case LE:
              case DISTINCT:
              case NOT_DISTINCT:
                  return true;
              default:
                  return false;
          }
      }
  
      public void addOperator(String strOp) throws CompilationException {
          OperatorType op = OperatorType.fromSymbol(strOp);
          if (op == null) {
              throw new CompilationException("Unsupported operator: " + strOp);
          }
          addOperator(op);
      }
  
      public void addOperator(OperatorType op) {
          if (op == null) {
              throw new NullPointerException();
          }
          opList.add(op);
      }
  
      @Override
      public Kind getKind() {
          return Kind.OP_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 Objects.hash(currentop, exprList, opList);
      }
  
      @Override
      public boolean equals(Object object) {
          if (this == object) {
              return true;
          }
          if (!(object instanceof OperatorExpr)) {
              return false;
          }
          OperatorExpr target = (OperatorExpr) object;
          return currentop == target.isCurrentop() && Objects.equals(exprList, target.exprList)
                  && Objects.equals(opList, target.opList);
      }
  }
  