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 com.datastax.oss.driver.internal.querybuilder.relation;
  
  import com.datastax.oss.driver.api.querybuilder.relation.Relation;
  import com.datastax.oss.driver.api.querybuilder.term.Term;
  import com.datastax.oss.driver.internal.querybuilder.lhs.LeftOperand;
  import com.datastax.oss.driver.shaded.guava.common.base.Preconditions;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import edu.umd.cs.findbugs.annotations.Nullable;
  import net.jcip.annotations.Immutable;
  
  @Immutable
  public class DefaultRelation implements Relation {
  
    private final LeftOperand leftOperand;
    private final String operator;
    private final Term rightOperand;
  
    public DefaultRelation(
        @NonNull LeftOperand leftOperand, @NonNull String operator, @Nullable Term rightOperand) {
      Preconditions.checkNotNull(leftOperand);
      Preconditions.checkNotNull(operator);
      this.leftOperand = leftOperand;
      this.operator = operator;
      this.rightOperand = rightOperand;
    }
  
    @Override
    public void appendTo(@NonNull StringBuilder builder) {
      leftOperand.appendTo(builder);
      builder.append(operator);
      if (rightOperand != null) {
        rightOperand.appendTo(builder);
      }
    }
  
    @Override
    public boolean isIdempotent() {
      return rightOperand == null || rightOperand.isIdempotent();
    }
  
    @NonNull
    public LeftOperand getLeftOperand() {
      return leftOperand;
    }
  
    @NonNull
    public String getOperator() {
      return operator;
    }
  
    @Nullable
    public Term getRightOperand() {
      return rightOperand;
    }
  }
  