[jira] [Updated] (COLLECTIONS-442) A set of enhanced iterator classes donated by the Apache Jena project
[ https://issues.apache.org/jira/browse/COLLECTIONS-442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Thomas Neidhart updated COLLECTIONS-442: Fix Version/s: (was: 4.0) 4.x A set of enhanced iterator classes donated by the Apache Jena project - Key: COLLECTIONS-442 URL: https://issues.apache.org/jira/browse/COLLECTIONS-442 Project: Commons Collections Issue Type: Improvement Components: Iterator Reporter: Claude Warren Fix For: 4.x Attachments: COLLECTIONS-442.tar.gz, FluentIterator.java, iter-src.zip A set of templated (Generic) iterators that add filtering, mapping, and conversion to set or list collections. Tests included. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (COLLECTIONS-442) A set of enhanced iterator classes donated by the Apache Jena project
[ https://issues.apache.org/jira/browse/COLLECTIONS-442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Andy Seaborne updated COLLECTIONS-442: -- Attachment: iter-src.zip A set of enhanced iterator classes donated by the Apache Jena project - Key: COLLECTIONS-442 URL: https://issues.apache.org/jira/browse/COLLECTIONS-442 Project: Commons Collections Issue Type: Improvement Components: Iterator Reporter: Claude Warren Fix For: 4.0 Attachments: COLLECTIONS-442.tar.gz, FluentIterator.java, iter-src.zip A set of templated (Generic) iterators that add filtering, mapping, and conversion to set or list collections. Tests included. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (COLLECTIONS-442) A set of enhanced iterator classes donated by the Apache Jena project
[ https://issues.apache.org/jira/browse/COLLECTIONS-442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Andy Seaborne updated COLLECTIONS-442: -- Attachment: (was: iter-src.zip) A set of enhanced iterator classes donated by the Apache Jena project - Key: COLLECTIONS-442 URL: https://issues.apache.org/jira/browse/COLLECTIONS-442 Project: Commons Collections Issue Type: Improvement Components: Iterator Reporter: Claude Warren Fix For: 4.0 Attachments: COLLECTIONS-442.tar.gz, FluentIterator.java, iter-src.zip A set of templated (Generic) iterators that add filtering, mapping, and conversion to set or list collections. Tests included. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (COLLECTIONS-442) A set of enhanced iterator classes donated by the Apache Jena project
[ https://issues.apache.org/jira/browse/COLLECTIONS-442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Andy Seaborne updated COLLECTIONS-442: -- Attachment: iter-src.zip A set of enhanced iterator classes donated by the Apache Jena project - Key: COLLECTIONS-442 URL: https://issues.apache.org/jira/browse/COLLECTIONS-442 Project: Commons Collections Issue Type: Improvement Components: Iterator Reporter: Claude Warren Fix For: 4.0 Attachments: COLLECTIONS-442.tar.gz, FluentIterator.java, iter-src.zip A set of templated (Generic) iterators that add filtering, mapping, and conversion to set or list collections. Tests included. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (COLLECTIONS-442) A set of enhanced iterator classes donated by the Apache Jena project
[
https://issues.apache.org/jira/browse/COLLECTIONS-442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Thomas Neidhart updated COLLECTIONS-442:
Attachment: FluentIterator.java
I have reworked the patch a bit, see the attached file. My rationale was as
follows:
* reuse existing code as much as possible
* use real classes instead of interfaces to avoid problems with breaking
compatibility when extending later on
An example how to use the interface:
{noformat}
public class MyTest {
public static void main(String[] args) {
ListInteger list = new ArrayListInteger();
list.add(1);
list.add(2);
list.add(3);
list.add(2);
list.add(3);
FluentIteratorString it =
FluentIterator.Integerempty()
.andThen(list.iterator())
.dropIf(new PredicateInteger() {
public boolean evaluate(Integer object) {
return object.intValue() 2;
}
})
.unique()
.andThen(list.iterator())
.mapWith(new TransformerInteger, String() {
public String transform(Integer input) {
return [ + String.valueOf(input.intValue())
+ ];
}
});
System.out.println(it.toList());
}
}
{noformat}
This prints
{noformat}
[[2], [3], [1], [2], [3], [2], [3]]
{noformat}
In the original patch, andThen behaved differently to the other composition
methods in the sense, that only andThen returned the same object. All the other
methods returned a new object.
This could be error-prone when people do things like this:
{noformat}
it.andThen(...)
it.filterKeep(...)
{noformat}
in fact, the andThen will update it, while filterKeep will return a new
object and leave it untouched. This is fine as long as you do method chaining
but can lead to unexpected errors or behavior in other cases.
So I decided to be consistent and always return the same object. The only
exception is the mapWith method, which will always return a new object as the
generic return type may change.
I am not completely happy with the class name, so if somebody has a better idea?
Any comments are welcome, if the API is accepted we can still include it for
the upcoming 4.0-alpha1 which I plan to release in 1-2 weeks.
A set of enhanced iterator classes donated by the Apache Jena project
-
Key: COLLECTIONS-442
URL: https://issues.apache.org/jira/browse/COLLECTIONS-442
Project: Commons Collections
Issue Type: Improvement
Components: Iterator
Reporter: Claude Warren
Fix For: 4.0
Attachments: COLLECTIONS-442.tar.gz, FluentIterator.java
A set of templated (Generic) iterators that add filtering, mapping, and
conversion to set or list collections. Tests included.
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[jira] [Updated] (COLLECTIONS-442) A set of enhanced iterator classes donated by the Apache Jena project
[ https://issues.apache.org/jira/browse/COLLECTIONS-442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Thomas Neidhart updated COLLECTIONS-442: Fix Version/s: (was: 4.x) 4.0 A set of enhanced iterator classes donated by the Apache Jena project - Key: COLLECTIONS-442 URL: https://issues.apache.org/jira/browse/COLLECTIONS-442 Project: Commons Collections Issue Type: Improvement Components: Iterator Reporter: Claude Warren Fix For: 4.0 Attachments: COLLECTIONS-442.tar.gz A set of templated (Generic) iterators that add filtering, mapping, and conversion to set or list collections. Tests included. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (COLLECTIONS-442) A set of enhanced iterator classes donated by the Apache Jena project
[ https://issues.apache.org/jira/browse/COLLECTIONS-442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Thomas Neidhart updated COLLECTIONS-442: Fix Version/s: 4.x A set of enhanced iterator classes donated by the Apache Jena project - Key: COLLECTIONS-442 URL: https://issues.apache.org/jira/browse/COLLECTIONS-442 Project: Commons Collections Issue Type: Improvement Components: Iterator Reporter: Claude Warren Fix For: 4.x Attachments: COLLECTIONS-442.tar.gz A set of templated (Generic) iterators that add filtering, mapping, and conversion to set or list collections. Tests included. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (COLLECTIONS-442) A set of enhanced iterator classes donated by the Apache Jena project
[ https://issues.apache.org/jira/browse/COLLECTIONS-442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Claude Warren updated COLLECTIONS-442: -- Attachment: COLLECTIONS-442.tar.gz source code for collecitons and test cases A set of enhanced iterator classes donated by the Apache Jena project - Key: COLLECTIONS-442 URL: https://issues.apache.org/jira/browse/COLLECTIONS-442 Project: Commons Collections Issue Type: Improvement Components: Iterator Reporter: Claude Warren Attachments: COLLECTIONS-442.tar.gz A set of templated (Generic) iterators that add filtering, mapping, and conversion to set or list collections. Tests included. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira
