content: /*
   * Created on Oct 17, 2010
   *
   * 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.
   *
   * Copyright @2010-2012 the original author or authors.
   */
  package org.fest.assertions.core;
  
  /**
   * Assertion methods applicable to {@link Number}s.
   *
   * @param <T> the type of the <em>actual</em> value.
   * @param <S> self type of the assertion objects.
   *
   * @author Alex Ruiz
   */
  public interface NumberAssert<S, T extends Number> {
    /**
     * Verifies that the <em>actual</em> value is equal to zero.
     *
     * @return this assertion object.
     * @throws AssertionError if the <em>actual</em> value is {@code null}.
     * @throws AssertionError if the <em>actual</em> value is not equal to zero.
     */
    S isZero();
  
    /**
     * Verifies that the <em>actual</em> value is not equal to zero.
     *
     * @return this assertion object.
     * @throws AssertionError if the <em>actual</em> value is {@code null}.
     * @throws AssertionError if the <em>actual</em> value is equal to zero.
     */
    S isNotZero();
  
    /**
     * Verifies that the <em>actual</em> value is positive.
     *
     * @return this assertion object.
     * @throws AssertionError if the <em>actual</em> value is {@code null}.
     * @throws AssertionError if the <em>actual</em> value is not positive.
     */
    S isPositive();
  
    /**
     * Verifies that the <em>actual</em> value is negative.
     *
     * @return this assertion object.
     * @throws AssertionError if the <em>actual</em> value is {@code null}.
     * @throws AssertionError if the <em>actual</em> value is not negative.
     */
    S isNegative();
  }
  