Question

我想使用Lambdaj和hamcrest匹配器来检查样本字符串是否至少包含一个列表项。

private static List<String> FIELDS=Arrays.asList("one","two","three","four");

String myString="This string may contain 'one' word or 'two' word";
boolean stringContainsItem=filter(Matchers.containsString(myString),FIELDS).isEmpty();

但匹配器不正确。我需要在那个地方有一些倒置的Matcher，它检查myString是否包含列表的项目。

Answer 1

您可以编写自己的匹配器：

private static List<String> FIELDS=Arrays.asList("one","two","three","four");

String myString="This string may contain 'one' word or 'two' word";
boolean stringDoesNotContainItem=filter(createIsInStringMatcher(myString),FIELDS).isEmpty();

使用：

private TypeSafeMatcher<String> createIsInStringMatcher(final String string) {
    return new TypeSafeMatcher<String>() {

        @Override
        public void describeTo(Description description) {
        }

        @Override
        protected boolean matchesSafely(String item) {
            return string.indexOf(item) >= 0;
        }
    };
}

编辑：还有另一种Lambdaj方法exists允许以更紧凑的方式编写它：

List<String> FIELDS = Arrays.asList("one", "two", "three", "four");

String myString = "This string may contain 'one' word or 'two' word";
boolean stringContainsItem = Lambda.exists(FIELDS, createIsInStringMatcher(myString));

过滤样本字符串中包含的项目

1 个答案: