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public interface Grepper<E>
A grep condition.
Classes implementing this interface provide a decision if particular elements should be part of the
result list of a grep process. See the grep
family of functions in Collections
.
A grepper has no state. That is, the result of the grep(Object)
decision is based solely
on the element passed, not on when it is tested. In other words, the outcome does not depend, for example,
on it's position in the input list, and the result must be consistently the same for multiple invocations,
provided no relevant information in the element is modified.
Nested Class Summary | |
---|---|
static class |
Grepper.ANDGrepper<E>
A Grepper that chains multiple client greppers logical-AND-wise. |
static class |
Grepper.InverseGrepper<E>
A Grepper that inverts the results of another grepper. |
static class |
Grepper.NULLGrepper<E>
A Grepper that rejects all elements, producing an empty result list. |
static class |
Grepper.ONEGrepper<E>
A Grepper that lets all elements pass. |
static class |
Grepper.ORGrepper<E>
A Grepper that chains multiple client greppers logical-OR-wise. |
static class |
Grepper.RegexGrepper
A Grepper that matches string-like elements against a regular expression. |
Method Summary | |
---|---|
boolean |
grep(E element)
Decides if the element in question should be part of the results of a grep process. |
Method Detail |
---|
boolean grep(E element)
element
- The element under test.
true
if the element matches the grep condition, thus should be added to the results,
otherwise false
.
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