001    /*
002     * Created on Oct 17, 2010
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
005     * the License. You may obtain a copy of the License at
006     *
007     * http://www.apache.org/licenses/LICENSE-2.0
008     *
009     * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
010     * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
011     * specific language governing permissions and limitations under the License.
012     *
013     * Copyright @2010-2011 the original author or authors.
014     */
015    package org.fest.assertions.core;
016    
017    /**
018     * Assertion methods applicable to <code>{@link Number}</code>s.
019     * @param <T> the type of the "actual" value.
020     *
021     * @author Alex Ruiz
022     */
023    public interface NumberAssert<T extends Number> {
024    
025      /**
026       * Verifies that the actual value is equal to zero.
027       * @return this assertion object.
028       * @throws AssertionError if the actual value is {@code null}.
029       * @throws AssertionError if the actual value is not equal to zero.
030       */
031      NumberAssert<T> isZero();
032    
033      /**
034       * Verifies that the actual value is not equal to zero.
035       * @return this assertion object.
036       * @throws AssertionError if the actual value is {@code null}.
037       * @throws AssertionError if the actual value is equal to zero.
038       */
039      NumberAssert<T> isNotZero();
040    
041      /**
042       * Verifies that the actual value is positive.
043       * @return this assertion object.
044       * @throws AssertionError if the actual value is {@code null}.
045       * @throws AssertionError if the actual value is not positive.
046       */
047      NumberAssert<T> isPositive();
048    
049      /**
050       * Verifies that the actual value is negative.
051       * @return this assertion object.
052       * @throws AssertionError if the actual value is {@code null}.
053       * @throws AssertionError if the actual value is not negative.
054       */
055      NumberAssert<T> isNegative();
056    
057    }