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.update;
  
  import com.datastax.oss.driver.api.core.CqlIdentifier;
  import com.datastax.oss.driver.api.querybuilder.term.Term;
  import com.datastax.oss.driver.api.querybuilder.update.Assignment;
  import com.datastax.oss.driver.shaded.guava.common.base.Preconditions;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import net.jcip.annotations.Immutable;
  
  @Immutable
  public abstract class CounterAssignment implements Assignment {
  
    public enum Operator {
      INCREMENT("%1$s=%1$s+%2$s"),
      DECREMENT("%1$s=%1$s-%2$s"),
      ;
  
      public final String pattern;
  
      Operator(String pattern) {
        this.pattern = pattern;
      }
    }
  
    private final CqlIdentifier columnId;
    private final Operator operator;
    private final Term value;
  
    protected CounterAssignment(
        @NonNull CqlIdentifier columnId, @NonNull Operator operator, @NonNull Term value) {
      Preconditions.checkNotNull(columnId);
      Preconditions.checkNotNull(value);
      this.columnId = columnId;
      this.operator = operator;
      this.value = value;
    }
  
    @Override
    public void appendTo(@NonNull StringBuilder builder) {
      builder.append(String.format(operator.pattern, columnId.asCql(true), buildRightOperand()));
    }
  
    private String buildRightOperand() {
      StringBuilder builder = new StringBuilder();
      value.appendTo(builder);
      return builder.toString();
    }
  
    @Override
    public boolean isIdempotent() {
      return false;
    }
  
    @NonNull
    public CqlIdentifier getColumnId() {
      return columnId;
    }
  
    @NonNull
    public Term getValue() {
      return value;
    }
  }
  