/*
    * 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.giraph.conf;
  
  import org.apache.hadoop.conf.Configuration;
  
  /**
   * Float Configuration option
   */
  public class FloatConfOption extends AbstractConfOption {
    /** Default value */
    private final float defaultValue;
  
    /**
     * Constructor
     *
     * @param key Configuration key
     * @param defaultValue default value
     * @param description configuration description
     */
    public FloatConfOption(String key, float defaultValue, String description) {
      super(key, description);
      this.defaultValue = defaultValue;
    }
  
    public float getDefaultValue() {
      return defaultValue;
    }
  
    @Override public boolean isDefaultValue(Configuration conf) {
      return Float.compare(get(conf), defaultValue) == 0;
    }
  
    @Override public String getDefaultValueStr() {
      return Float.toString(defaultValue);
    }
  
    @Override public ConfOptionType getType() {
      return ConfOptionType.FLOAT;
    }
  
    /**
     * Lookup value
     *
     * @param conf Configuration
     * @return value for key, or defaultValue if not present
     */
    public float get(Configuration conf) {
      return conf.getFloat(getKey(), defaultValue);
    }
  
    /**
     * Set value
     *
     * @param conf Configuration
     * @param value to set
     */
    public void set(Configuration conf, float value) {
      conf.setFloat(getKey(), value);
    }
  
    /**
     * Set value if it's not already present
     *
     * @param conf Configuration
     * @param value to set
     */
    public void setIfUnset(Configuration conf, float value) {
      if (!contains(conf)) {
        conf.setFloat(getKey(), value);
      }
    }
  }