/* 
    * 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 org.esigate.util;
  
  import java.util.Properties;
  
  /**
   * A parameter with a T value.
   * 
   * @param <T>
   *            type
   */
  public abstract class Parameter<T> {
      private final String name;
      private final T defaultValue;
  
      @Override
      public boolean equals(Object obj) {
          boolean equals = false;
          if (obj != null) {
              if (obj instanceof Parameter) {
                  equals = this.name.equals(((Parameter<?>) obj).getName());
              } else if (obj instanceof String) {
                  equals = this.name.equals(obj);
              }
          }
          return equals;
      }
  
      @Override
      public String toString() {
          return this.name;
      }
  
      @Override
      public int hashCode() {
          return this.name.hashCode();
      }
  
      public Parameter(String name) {
          this(name, null);
      }
  
      Parameter(String name, T defaultValue) {
          this.name = name;
          this.defaultValue = defaultValue;
  
      }
  
      public String getName() {
          return name;
      }
  
      public T getDefaultValue() {
          return defaultValue;
      }
  
      public T getValue(Properties properties) {
          T value = (T) properties.getProperty(this.name);
  
          if (value == null) {
              value = defaultValue;
          }
          return value;
      }
  
  }