001 /*
002 * Created on Oct 20, 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.internal;
016
017 import org.fest.assertions.core.AssertionInfo;
018 import org.fest.util.ComparisonStrategy;
019
020 /**
021 * Base class of reusable assertions for numbers.
022 *
023 * @author Joel Costigliola
024 */
025 public abstract class Numbers<NUMBER extends Comparable<NUMBER>> extends Comparables {
026
027 public Numbers() {
028 super();
029 }
030
031 public Numbers(ComparisonStrategy comparisonStrategy) {
032 super(comparisonStrategy);
033 }
034
035 protected abstract NUMBER zero();
036
037 /**
038 * Asserts that the actual value is equal to zero.<br>
039 * It does not rely on the custom comparisonStrategy (if one is set).
040 * @param info contains information about the assertion.
041 * @param actual the actual value.
042 * @throws AssertionError if the actual value is {@code null}.
043 * @throws AssertionError if the actual value is not equal to zero.
044 */
045 public void assertIsZero(AssertionInfo info, NUMBER actual) {
046 assertEqualByComparison(info, actual, zero());
047 }
048
049 /**
050 * Asserts that the actual value is not equal to zero.<br>
051 * It does not rely on the custom comparisonStrategy (if one is set).
052 * @param info contains information about the assertion.
053 * @param actual the actual value.
054 * @throws AssertionError if the actual value is {@code null}.
055 * @throws AssertionError if the actual value is equal to zero.
056 */
057 public void assertIsNotZero(AssertionInfo info, NUMBER actual) {
058 assertNotEqualByComparison(info, actual, zero());
059 }
060
061 /**
062 * Asserts that the actual value is negative.
063 * @param info contains information about the assertion.
064 * @param actual the actual value.
065 * @throws AssertionError if the actual value is {@code null}.
066 * @throws AssertionError if the actual value is not negative: it is either equal to or greater than zero.
067 */
068 public void assertIsNegative(AssertionInfo info, NUMBER actual) {
069 assertLessThan(info, actual, zero());
070 }
071
072 /**
073 * Asserts that the actual value is positive.
074 * @param info contains information about the assertion.
075 * @param actual the actual value.
076 * @throws AssertionError if the actual value is {@code null}.
077 * @throws AssertionError if the actual value is not positive: it is either equal to or less than zero.
078 */
079 public void assertIsPositive(AssertionInfo info, NUMBER actual) {
080 assertGreaterThan(info, actual, zero());
081 }
082
083 }