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/*
 * Copyright 2013 Goodow.com
 * 
 * Licensed 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.goodow.realtime.operation.number;

import com.goodow.realtime.operation.AbstractOperation;

public class NumberAddOperation extends AbstractOperation {

  public static final int TYPE = 8;
  private final double number;

  public NumberAddOperation(String id, double number) {
    super(TYPE, id);
    assert number != 0;
    this.number = number;
  }

  @Override
  public void apply(NumberTarget target) {
    target.add(number);
  }

  @Override
  public NumberAddOperation invert() {
    return new NumberAddOperation(id, -number);
  }

  @Override
  public NumberAddOperation[] transformWith(AbstractOperation operation,
      boolean arrivedAfter) {
    assert (operation instanceof NumberAddOperation || operation instanceof NumberResetOperation)
        && isSameId(operation);
    return operation instanceof NumberAddOperation ? asArray(this) : null;
  }

  @Override
  protected void toString(StringBuilder sb) {
    sb.append(number);
  }
}