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package com.bbn.bue.common.converters;

import com.google.common.annotations.Beta;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Decodes "true" and "false" values and disallows others.
 *
 * @author rgabbard
 */
@Beta
public class StrictStringToBoolean implements StringConverter {

  /**
   * If s is "true" returns true; if "false", returns false;
   * otherwise, throws a ValidationException.
   *
   * @param s May not be null.
   */
  @Override
  public Boolean decode(final String s) {
    checkNotNull(s);
    if ("true".equals(s)) {
      return Boolean.TRUE;
    } else if ("false".equals(s)) {
      return Boolean.FALSE;
    } else {
      throw new ConversionException(
          String.format("Strictly-converted booleans must be either 'true' or 'false', not %s", s));
    }
  }
}