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StreamEx changes

Check also MIGRATION.md for possible compatibility problems.

0.8.2

  • [#260] Added: count(Predicate)

0.8.1

  • [#245] Fixed: back to 'jar' packaging
  • [#253] Added: Version information in module descriptor

0.8.0

  • [#244] Added: StreamEx.toMutableList and StreamEx.toMutableSet.
    Removed mutability guarantee for toList and toSet. Added temporary system property streamex.default.immutable (set it to 'true' to test with immutable toList and toSet)
  • [#238] Added: valuesToMap, valuesToSortedMap, valuesToNavigableMap methods to StreamEx
  • [#250] Fixed: EntryStream.withoutKeys and EntryStream.withoutValues declared as @SafeVarargs
  • [#251] Changed: public classes like StreamEx and EntryStream declared as final now.
  • [#246] Added: Proper module-info.class, now it's full-fledged JPMS module
  • [#247] Fixed: now it's possible to build using Java 16 and Java 17 (though reference builds are created via Java 11)
  • [#091] Changed: API tests moved to the separate package.
  • [#185] Added: EntryStream.withoutKeys and EntryStream.withoutValues.
  • Minor documentation fixes

0.7.3

  • [#028] Added: StreamEx.toCollectionAndThen.
  • [#039] Added: AbstractStreamEx.reducingWithZero and MoreCollectors.reducingWithZero.
  • [#043] Added: MoreCollectors.entriesToMap and MoreCollectors.entriesToCustomMap methods accepting Entry<K,V>.
  • [#093] Optimized: parallel performance of unordered primitive streams and for short-circuiting streams is improved.
  • [#219] Changed: MoreCollectors now reject eagerly null parameters where possible; MoreCollectors.last throws NPE if last stream element is null.
  • [#221] Fixed: rangeClosed(x, x, step) returned empty stream instead of stream of x if step absolute value is bigger than one.
  • [#226] Added: EntryStream.pairMap (pairMap pulled up to AbstractStreamEx).
  • [#229] Fixed: some non-canonical nans were sorted incorrectly with Double.reverseSorted().

0.7.2

  • Fixed: accidental use of Java 9 API in CrossSpliterator.

0.7.1

  • [#202] Fixed: StreamEx/EntryStream.ofTree stack consumption is now limited.
  • Multi-release Jar is used to provide Java 9+ specializations.

0.7.0

  • [#193] Removed optimizations which rely on internal implementation details of Stream API (unwrap IteratorSpliterator; do not delegate to Stream::close when unnecessary)
  • [#194] Removed: skipOrdered.
  • [#200] Added: EntryStream.allMatch/anyMatch/noneMatch accepting key-value pair.
  • Now Java 11 is used to build the library. In particular this results in modern JavaDoc artifact (including the search).

0.6.8

  • [#183] Added: StreamEx.mapPartial, EntryStream.mapToKeyPartial/mapToValuePartial/mapKeyValuePartial
  • [#191] Deprecated: skipOrdered.

0.6.7

  • [#76] Added: StreamEx.zipWith accepting BaseStream (so zipWith(IntStreamEx.ints()) works)
  • [#131] Added: StreamEx.ofCombinations
  • [#164] Added: Joining.maxElements
  • [#179] Added: MoreCollectors.onlyOne(Predicate)

0.6.6

  • [#145] Added: intersperse method for all stream types.
  • [#144] Added: EntryStream.generate
  • [#162] Added: StreamEx.ifEmpty, EntryStream.ifEmpty

0.6.5

  • [#137] Added: StreamEx.toNavigableMap(), EntryStream.toNavigableMap()
  • [#141] Added: StreamEx.flatArray(), EntryStream.flatArray()
  • [#143] Optimized: AbstractStreamEx.takeWhile/takeWhileInclusive/dropWhile for parallel unordered case.

0.6.4

  • [#132] Fixed: StreamEx.parallel(fjp) does not parallelize underlying Java Stream if it already exists
  • [#127] Added: StreamEx.filterBy
  • [#128] Added: EntryStream.prefixKeys, EntryStream.prefixValues
  • [#135] Added: StreamEx.removeBy

0.6.3

  • [#111] Added: StreamEx.toArray(elementClass)
  • [#112] Added: StreamEx.toArray(emptyArray)
  • [#116] Added: MoreCollectors.ifAllMatch()
  • [#119] Added: AbstractStreamEx.toImmutableList(), AbstractStreamEx.toImmutableSet(), EntryStream.toImmutableMap()
  • [#123] Added: StreamEx.into(collection), EntryStream.into(map)

0.6.2

  • [#17] Optimized: StreamEx.ofTree, EntryStream.ofTree.
  • [#104] Added: StreamEx.ofReversed().
  • [#105] Added: MoreCollectors.minMax().
  • [#108] Added: IntStreamEx.of(IntBuffer), LongStreamEx.of(LongBuffer), DoubleStreamEx.of(DoubleBuffer).

0.6.1

  • [#90] Changed: AbstractStreamEx class (which shares common functionality of StreamEx and EntryStream) is public now.
  • [#92] Added: IntStreamEx.of(InputStream).
  • [#93] Added: IntStreamEx.asByteInputStream().
  • [#94] Added: prefix method for all stream types.

0.6.0

Warning: this release introduces some changes which may break backwards compatibility.

  • [#67] Changed: StreamEx.withFirst() now includes (first, first) pair into result as well. If you want to exclude it, use .withFirst().skip(1).
  • [#70] Fixed: MoreCollectors.least()/greatest() now support null element (if the supplied Comparator supports nulls).
  • [#70] Fixed: MoreCollectors.least()/greatest() now returns stable result (the order of equal elements is not changed).
  • [#70] Optimized: MoreCollectors.least()/greatest() is usually faster now, especially when the selected elements are close to the stream end.
  • [#74] Added: EntryStream.removeKeyValue().
  • [#77] Added: MoreCollectors.filtering()/mapping()/flatMapping() with default downstream Collector toList().
  • [#79] Added: iterate(seed, predicate, op) for all stream types.
  • [#82] Added: Emitter class and primitive friends to create non-trivial stream sources.
  • [#83] Changed: StreamEx.of(Collection), of(Iterator), etc. now use ? extends T type instead of just T.
  • [#85] Added: StreamEx.mapFirstOrElse()/mapLastOrElse().
  • [#86] Added: peekFirst(), peekLast() for all stream types.
  • [#89] Added: produce() method for all stream types.
  • Updated documentation.

0.5.5

  • [#41] Added: IntStreamEx/LongStreamEx/StreamEx.without() accepting several elements.
  • [#60] Added: StreamEx.zipWith() to zip the stream with another.
  • [#63] Optimized IntStreamEx/LongStreamEx/DoubleStreamEx.reverseSorted(): much faster now and take less memory.
  • [#64] Added: EntryStream.toMapAndThen().
  • [#66] Added: takeWhileInclusive() for all stream types.
  • [#71] Fixed: some collectors like head(0), greatest(0) failed when using with JDK Stream.
  • [#72] Added: IntStreamEx.ints() and LongStreamEx.longs().
  • [#73] Added: EntryStream.collapseKeys().

0.5.4

  • [#10] Added: chain() method to all stream types allowing fluently chaining custom operations.
  • [#55] TailConcatSpliterator implemented; now all StreamEx/EntryStream.append/prepend methods are TSO-compatible.
  • [#56] Fixed: StreamEx.append/prepend(Collection) and EntryStream.append/prepend(Map) now properly append/prepend if supplied collection is concurrent (so it may be legally modified during the subsequent operations).
  • [#57] JDK Stream creation is deferred until necessary. Now quasi-intermediate operations and especially headTail() may work faster.
  • [#59] Added: StreamEx.prepend(value), StreamEx.append(value) which might work faster than existing var-args methods.
  • Updated documentation.

0.5.3

  • [#50] Added: StreamEx.withFirst(): extract first stream element
  • [#51] Fixed: StreamEx.parallel(fjp).runLengths() fails to run the task in the specified pool.
  • [#52] StreamEx.append(T...) and prepend(T...) are declared as @SafeVarargs and final now.
  • [#53] Optimized: mapFirst/mapLast methods will have less overhead now, especially for primitive streams.
  • [#54] Added: StreamEx.headTail(): map to the new stream using the first stream element and the stream of the rest elements.

0.5.2

  • [#3] Optimized: parallel performance of StreamEx.ofLines as well as StreamEx.split
  • [#19] Optimized: pairMap and forPairs may work faster now, especially in the presence of upstream intermediate operations.
  • [#42] Added: EntryStream.ofTree methods to stream the tree-like structure tracking nodes depth.
  • [#46] Optimized: parallel performance of all of(Iterator) methods.
  • [#47] Added: EntryStream.flatMapToKey/flatMapToValue methods.
  • [#48] EntryStream.of(key, value, key, value...) now accepts up to 10 pairs.
  • Fixed: StreamEx.of(emptyList().iterator()).parallel() failed with NoSuchElementException.

0.5.1

  • [#13] Added: StreamEx.split to split with single character delimiter.
  • [#28] Updated: now StreamEx.select, EntryStream.selectKeys and EntryStream.selectValues accept any type (not necessarily the subtype of current element).
  • [#32] Added: MoreCollectors.dominators collector which collects the elements to the list leaving only "dominators".
  • [#33] Updated: StreamEx.split("", pattern) now returns stream of single "" string instead of empty stream.
  • [#35] Added: construction of all stream types from the Iterator.
  • [#36] Added: StreamEx.of(Enumeration) static method.
  • [#38] Added: scanLeft for primitive streams.
  • Updated documentation.

0.5.0

Warning: this release introduces some changes which break the backward compatibility and will require the changes in source code if you used the previous StreamEx versions.

  • The package javax.util.streamex is renamed to one.util.streamex. Every occurrence of javax.util.streamex in source files must be replaced with one.util.streamex.
  • The OSGi Bundle-SymbolicName is changed from javax.util.streamex to one.util.streamex.
  • The Maven groupID is changed from io.github.amaembo to one.util. Dependencies in pom.xml files should be updated accordingly.
  • Added: StreamEx.ofLines(Path) and StreamEx.ofLines(Path, Charset)
  • Added: MoreCollectors.commonPrefix()/commonSuffix() short-circuiting collectors.
  • Added: IntStreamEx.of(Integer[]), LongStreamEx.of(Long[]), DoubleStreamEx.of(Double[]) static methods.
  • Deprecated methods StreamEx.ofEntries() removed.
  • Deprecated methods collectingAndThen in primitive collectors removed (use andThen() instead).
  • Updated documentation.

0.4.1

  • Added: StreamEx/IntStreamEx/LongStreamEx/DoubleStreamEx.mapLast/mapFirst methods.
  • Added: MoreCollectors.flatMapping collector.
  • Added: Joining collector: an advanced version of Collectors.joining which may short-circuit.
  • Fixed: StreamEx.cross(mapper) now correctly handles the case when mapper returns null instead of empty stream.
  • Optimized: ordered stateful short-circuit collectors now may process less elements in parallel.
  • Optimized: StreamEx/EntryStream.toList()/toListAndThen()/foldRight()/scanRight() now faster, especially for sized stream.
  • Optimized: collapse-based operations like StreamEx.collapse/groupRuns/runLengths/intervalMap now may work faster, especially when stream has more intermediate operations before them.
  • Updated documentation.

0.4.0

  • Introduced the concept of short-circuiting collectors.
  • StreamEx/EntryStream.collect(Collector) method works as short-circuit operation if short-circuiting collector is passed.
  • MoreCollectors.first/head collectors are short-circuiting now.
  • MoreCollectors.groupingByEnum collector may short-circuit if downstream collector is short-circuiting.
  • MoreCollectors.pairing collector may short-circuit if both downstream collectors are short-circuiting.
  • Added new short-circuiting collectors: onlyOne, intersecting, toEnumSet, andingInt, andingLong.
  • Added new collectors: filtering, groupingBy (with domain specification) which short-circuit when downstream collector is short-circuiting.
  • Added collectors mapping, collectingAndThen, partitioningBy which mimic standard JDK collectors, but short-circuit when downstream collector is short-circuiting.
  • Added indexOf methods for all stream types.
  • Added StreamEx/EntryStream.foldLeft/foldRight methods without identity argument.
  • Added StreamEx/EntryStream.scanLeft/scanRight methods without identity argument.
  • Added StreamEx.cartesianProduct/cartesianPower methods with reduction operator.
  • Added IntStreamEx/LongStreamEx.range/rangeClosed methods with additional step parameter.
  • Added IntStreamEx/LongStreamEx/DoubleStreamEx.foldLeft methods.
  • Methods StreamEx/EntryStream.toMap/toSortedMap/toCustomMap without merge function now produce better exception message in the case of duplicate keys.
  • Methods StreamEx/EntryStream.toMap/toSortedMap/toCustomMap accepting merge function are not guaranteed to return ConcurrentMap for parallel streams now. They however guarantee now the correct merging order for non-commutative merger functions.
  • Methods StreamEx/EntryStream.grouping* are not guaranteed to return the ConcurrentMap for parallel streams now. They however guarantee now the correct order of downstream collection.
  • Methods StreamEx.ofEntries are declared as deprecated and may be removed in future releases!
  • Deprecated methods EntryStream.mapEntryKeys/mapEntryValues are removed!
  • Updated documentation

0.3.8

  • Added toBooleanArray collectors (object and primitive).
  • Added MoreCollectors.distinctBy collector.
  • Added StreamEx/EntryStream.distinct(keyExtractor) intermediate operation.
  • Added EntryStream.distinctKeys/distinctValues intermediate operations.
  • Added StreamEx.cartesianPower/cartesianProduct static methods.
  • Optimized: MoreCollectors.least/greatest collectors are now much faster (up to 10x depending on input).
  • Updated documentation

0.3.7

  • Added MoreCollectors.groupingByEnum collector.
  • Added IntCollector/LongCollector/DoubleCollector.averaging primitive collectors.
  • Added IntCollector/LongCollector/DoubleCollector.andThen default methods to replace collectingAndThen.
  • Added StreamEx.toFlatCollection and StreamEx.toFlatList terminal operations.
  • Added StreamEx.ofSubLists(list, length, shift) static method.
  • Methods IntCollector/LongCollector/DoubleCollector.collectingAndThen are declared as deprecated and may be removed in future releases!
  • Updated documentation

0.3.6

  • Added StreamEx.collapse(Predicate, Collector) operation.
  • Added takeWhile and dropWhile methods for all stream types.
  • Added StreamEx.ofPairs and EntryStream.ofPairs methods.
  • Optimized: minBy*/maxBy* methods for primitive streams now call keyExtractor function at most once per element.
  • Updated documentation

0.3.5

  • Generic arguments relaxed for StreamEx methods: forPairs, collapse, groupRuns, intervalMap, sortedBy.
  • Added MoreCollectors.minIndex/maxIndex collectors.

0.3.4

  • Fixed: EntryStream.of(List<T>), EntryStream.of(T[]) and StreamEx.runLengths returned stream of Map.Entry objects which violate the documented contract for equals and hashCode.
  • Fixed: pairMap method for all streams worked incorrectly when previous steps included parallel().flatMap() due to JDK bug. New version may also work faster in parallel for certain sources.
  • Fixed: collapse-based methods (collapse, groupRuns, runLengths, intervalMap) worked incorrectly in various cases in parallel mode. New version may also work faster in parallel for certain sources.
  • Fixed: minBy*/maxBy* for primitive streams now return strictly the first matched element (not the arbitrary one).
  • Optimized: minBy/maxBy methods for primitive streams now call keyExtractor function at most once per element
  • Optimized: many stream creation methods (zip for all streams, EntryStream.of(List), StreamEx.ofSubLists, etc.) now use custom spliterator.
  • Optimized: IntStreamEx.ofChars reimplemented for JDK 8 as original CharSequence.chars implementation is poor.
  • Added construction of all stream types from the Spliterator.
  • Updated documentation

0.3.3

  • Added StreamEx.intervalMap method
  • Added StreamEx.runLengths method
  • Added StreamEx.ofSubLists method
  • Added MoreCollectors.countingInt collector
  • StreamEx/EntryStream.maxBy*/minBy* methods optimized: now keyExtractor function is called at most once per element
  • StreamEx.groupRuns method optimized (up to 5x performance boost depending on data)
  • StreamEx.collapse methods changed: now the elements passed to the predicate are guaranteed to be two adjacent elements from the source stream.
  • Updated documentation: now documentation is automatically copied from JDK for the inherited methods.

0.3.2

  • Added MoreCollectors class: several useful collectors absent in JDK
  • Added skipOrdered(n) method to every Stream implementation
  • Updated documentation

0.3.1

  • Added mapToEntry method for primitive streams
  • Added joining methods family for primitive streams
  • Added StreamEx.collapse/groupRuns methods
  • Added StreamEx.distinct(atLeast) method
  • Released jar works now as an OSGi bundle
  • Updated documentation

0.3.0

  • Added primitive collectors: IntCollector, LongCollector, DoubleCollector
  • Added flatMapToInt/flatMapToLong/flatMapToDouble/flatMapToObj to primitive streams
  • Added EntryStream.flatMapKeyValue/filterKeyValue/mapToKey/mapToValue methods
  • Added IntStreamEx.toCharArray/toShortArray/toByteArray methods
  • Added DoubleStreamEx.toFloatArray method
  • Generic arguments for many methods are relaxed allowing more flexible usage
  • Methods EntryStream.mapEntryKeys/mapEntryValues are declared as deprecated and may be removed in future releases!
  • Updated documentation

0.2.3

  • Added toListAndThen(), toSetAndThen() methods to StreamEx and EntryStream
  • Added StreamEx.cross() methods family
  • Added EntryStream.peekKeys(), EntryStream.peekValues(), EntryStream.peekKeyValue() methods
  • Added construction of EntryStream from List or array (indices are used as keys)
  • Added construction of EntryStream from two and three key-value pairs
  • Added EntryStream.append/prepend for two and three key-value pairs
  • Added greater/less/atLeast/atMost filter methods for primitive streams
  • Updated documentation

0.2.2

  • Fixed: StreamEx.flatMapToEntry, EntryStream.flatMapKeys and EntryStream.flatMapValues now correctly handles null value returned by mapper
  • Added StreamEx.scanRight() and EntryStream.scanRight() methods
  • Added StreamEx.foldRight() and EntryStream.foldRight() methods
  • Added StreamEx.forPairs() method
  • Added StreamEx.partitioningBy() methods
  • Added StreamEx.partitioningTo() method
  • Added StreamEx.groupingTo() methods
  • Added StreamEx.ofPermutations(int) constructor
  • Added StreamEx.ofTree constructors
  • Added StreamEx.without(), IntStreamEx.without(), LongStreamEx.without() methods
  • Added EntryStream.join() methods
  • Updated documentation

0.2.1

  • Fixed: flatCollection method now correctly handles null value returned by mapper
  • Added IntStreamEx.charsToString, IntStreamEx.codePointsToString methods
  • Added StreamEx.scanLeft() and EntryStream.scanLeft() methods
  • Added construction of EntryStream by zipping keys and values from two arrays/lists
  • Added construction of StreamEx/IntStreamEx/LongStreamEx/DoubleStreamEx by zip-mapping two arrays/lists
  • Added pairMap method for handling adjacent pairs
  • The append/prepend methods of StreamEx/EntryStream can accept a Collection now
  • Updated documentation

0.2.0

  • Added parallel(fjc) method for all stream types
  • Added StreamEx.reverseSorted() method
  • Added StreamEx.foldLeft() and EntryStream.foldLeft() methods
  • Added IntStreramEx.toBitSet() method
  • Added construction of IntStreamEx from char[], short[], byte[] arrays
  • Added construction of DoubleStreamEx from float[] array
  • Updated documentation

0.1.2

  • Added IntStreamEx.elements methods family
  • Added construction of the constant stream
  • Added minBy/maxBy methods family for primitive streams
  • Updated documentation

0.1.1

  • Fixed: empty() method of all the streams worked incorrectly when used several times
  • Added IntStreamEx.ofIndices methods family
  • Added IntStreamEx.range(int) and LongStreamEx.range(long)
  • Added StreamEx.ofNullable
  • Added construction of the streams from optionals
  • Added construction of the streams from array subrange
  • Updated documentation

0.1.0

Warning: this release introduces some changes which may break backwards compatibility

  • EntryStream.toMap(Supplier) and EntryStream.toMap(BinaryOperator, Supplier) renamed to toCustomMap
  • Added StreamEx.toSortedMap and EntryStream.toSortedMap methods family
  • Methods producing Map use concurrent collector for parallel streams if possible
  • Updated documentation