src/com/facebook/buck/rules/keys/AppendingAlterRuleKey.java

/*
 * Copyright 2015-present Facebook, Inc.
 *
 * 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.facebook.buck.rules.keys;

import com.facebook.buck.rules.BuildRule;
import com.facebook.buck.rules.RuleKey;
import com.facebook.buck.rules.RuleKeyAppendable;

import java.lang.reflect.Field;


class AppendingAlterRuleKey extends AbstractAlterRuleKey {
  public AppendingAlterRuleKey(Field field) {
    super(field);
  }

  @Override
  public void amendKey(RuleKey.Builder builder, BuildRule rule) {
    RuleKeyAppendable appendable = (RuleKeyAppendable) getValue(
        field,
        rule);
    if (appendable != null) {
      appendable.appendToRuleKey(builder, field.getName());
    }
  }
}