Joining (StreamEx 0.6.5 API)

Object
- Joining

All Implemented Interfaces:

Collector<CharSequence,Joining.Accumulator,String>
```
public class Joining
extends Object
```
An advanced implementation of joining Collector. This collector is capable to join the input CharSequence elements with given delimiter optionally wrapping into given prefix and suffix and optionally limiting the length of the resulting string (in Unicode code units, code points or grapheme clusters) adding the specified ellipsis sequence. This collector supersedes the standard JDK Collectors.joining(CharSequence, CharSequence, CharSequence) collectors family.
This collector is short-circuiting when the string length is limited in either of ways. Otherwise it's not short-circuiting.
Every specific collector represented by this class is immutable, so you can share it. A bunch of methods is provided to create a new collector based on this one.
To create Joining collector use with(CharSequence) static method and specify the delimiter. For further setup use specific instance methods which return new Joining objects like this:
```
 StreamEx.of(source).collect(Joining.with(", ").wrap("[", "]")
         .maxCodePoints(100).cutAtWord());
 
```
The intermediate accumulation type of this collector is the implementation detail and not exposed to the API. If you want to cast it to Collector type, use ? as accumulator type variable:
```
 Collector<CharSequence, ?, String> joining = Joining.with(", ");
 
```
Since:

0.4.1

Author:

Tagir Valeev

Nested Class Summary
- Nested classes/interfaces inherited from interface Collector
  Collector.Characteristics

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`BiConsumer<Joining.Accumulator,CharSequence>`	`accumulator()` A function that folds a value into a mutable result container.
`Set<Collector.Characteristics>`	`characteristics()` Returns a `Set` of `Collector.Characteristics` indicating the characteristics of this Collector.
`BinaryOperator<Joining.Accumulator>`	`combiner()` A function that accepts two partial results and merges them.
`Joining`	`cutAfterDelimiter()` Returns a `Collector` which behaves like this collector, but cuts the resulting string after the delimiter when limit is reached.
`Joining`	`cutAnywhere()` Returns a `Collector` which behaves like this collector, but cuts the resulting string at any point when limit is reached.
`Joining`	`cutAtCodePoint()` Returns a `Collector` which behaves like this collector, but cuts the resulting string between any code points when limit is reached.
`Joining`	`cutAtGrapheme()` Returns a `Collector` which behaves like this collector, but cuts the resulting string at grapheme cluster boundary when limit is reached.
`Joining`	`cutAtWord()` Returns a `Collector` which behaves like this collector, but cuts the resulting string at word boundary when limit is reached.
`Joining`	`cutBeforeDelimiter()` Returns a `Collector` which behaves like this collector, but cuts the resulting string before the delimiter when limit is reached.
`Joining`	`ellipsis(CharSequence ellipsis)` Returns a `Collector` which behaves like this collector, but uses the specified ellipsis `CharSequence` instead of default `"..."` when the string limit (if specified) is reached.
`Function<Joining.Accumulator,String>`	`finisher()` Perform the final transformation from the intermediate accumulation type `A` to the final result type `R`.
`Joining`	`maxChars(int limit)` Returns a `Collector` which behaves like this collector, but sets the maximal length of the resulting string to the specified number of UTF-16 characters (or Unicode code units).
`Joining`	`maxCodePoints(int limit)` Returns a `Collector` which behaves like this collector, but sets the maximal number of Unicode code points of the resulting string.
`Joining`	`maxGraphemes(int limit)` Returns a `Collector` which behaves like this collector, but sets the maximal number of grapheme clusters.
`Supplier<Joining.Accumulator>`	`supplier()` A function that creates and returns a new mutable result container.
`static Joining`	`with(CharSequence delimiter)` Returns a `Collector` that concatenates the input elements, separated by the specified delimiter, in encounter order.
`Joining`	`wrap(CharSequence prefix, CharSequence suffix)` Returns a `Collector` which behaves like this collector, but additionally wraps the result with the specified prefix and suffix.

Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface Collector
of, of

- Method Detail
  - with
```
public static Joining with(CharSequence delimiter)
```
    Returns a Collector that concatenates the input elements, separated by the specified delimiter, in encounter order.
    This collector is similar to Collectors.joining(CharSequence), but can be further set up in a flexible way, for example, specifying the maximal allowed length of the resulting String.
    
    Parameters:
    
    delimiter - the delimiter to be used between each element
    
    Returns:
    
    A Collector which concatenates CharSequence elements, separated by the specified delimiter, in encounter order
    
    See Also:
    
    Collectors.joining(CharSequence)
  - wrap
```
public Joining wrap(CharSequence prefix,
                    CharSequence suffix)
```
    Returns a Collector which behaves like this collector, but additionally wraps the result with the specified prefix and suffix.
    The collector returned by Joining.with(delimiter).wrap(prefix, suffix) is equivalent to Collectors.joining(CharSequence, CharSequence, CharSequence), but can be further set up in a flexible way, for example, specifying the maximal allowed length of the resulting String.
    If length limit is specified for the collector, the prefix length and the suffix length are also counted towards this limit. If the length of the prefix and the suffix exceed the limit, the resulting collector will not accumulate any elements and produce the same output. For example, stream.collect(Joining.with(",").wrap("prefix", "suffix").maxChars(9)) will produce "prefixsuf" string regardless of the input stream content.
    You may wrap several times: Joining.with(",").wrap("[", "]").wrap("(", ")") is equivalent to Joining.with(",").wrap("([", "])").
    
    Parameters:
    
    prefix - the sequence of characters to be used at the beginning of the joined result
    
    suffix - the sequence of characters to be used at the end of the joined result
    
    Returns:
    
    a new Collector which wraps the result with the specified prefix and suffix.
  - ellipsis
```
public Joining ellipsis(CharSequence ellipsis)
```
    Returns a Collector which behaves like this collector, but uses the specified ellipsis CharSequence instead of default "..." when the string limit (if specified) is reached.
    
    Parameters:
    
    ellipsis - the sequence of characters to be used at the end of the joined result to designate that not all of the input elements are joined due to the specified string length restriction.
    
    Returns:
    
    a new Collector which will use the specified ellipsis instead of current setting.
  - maxChars
```
public Joining maxChars(int limit)
```
    Returns a Collector which behaves like this collector, but sets the maximal length of the resulting string to the specified number of UTF-16 characters (or Unicode code units). This setting overwrites any limit previously set by maxChars(int), maxCodePoints(int) or maxGraphemes(int) call.
    The String produced by the resulting collector is guaranteed to have length which does not exceed the specified limit. An ellipsis sequence (by default "...") is used to designate whether the limit was reached. Use ellipsis(CharSequence) to set custom ellipsis sequence.
    The collector returned by this method is short-circuiting: it may not process all the input elements if the limit is reached.
    
    Parameters:
    
    limit - the maximal number of UTF-16 characters in the resulting String.
    
    Returns:
    
    a new Collector which will produce String no longer than given limit.
  - maxCodePoints
```
public Joining maxCodePoints(int limit)
```
    Returns a Collector which behaves like this collector, but sets the maximal number of Unicode code points of the resulting string. This setting overwrites any limit previously set by maxChars(int), maxCodePoints(int) or maxGraphemes(int) call.
    The String produced by the resulting collector is guaranteed to have no more code points than the specified limit. An ellipsis sequence (by default "...") is used to designate whether the limit was reached. Use ellipsis(CharSequence) to set custom ellipsis sequence.
    The collector returned by this method is short-circuiting: it may not process all the input elements if the limit is reached.
    
    Parameters:
    
    limit - the maximal number of code points in the resulting String.
    
    Returns:
    
    a new Collector which will produce String no longer than given limit.
  - maxGraphemes
```
public Joining maxGraphemes(int limit)
```
    Returns a Collector which behaves like this collector, but sets the maximal number of grapheme clusters. This setting overwrites any limit previously set by maxChars(int), maxCodePoints(int) or maxGraphemes(int) call.
    The grapheme cluster is defined in Unicode Text Segmentation technical report. Basically, it counts base character and the following combining characters as single object. The String produced by the resulting collector is guaranteed to have no more grapheme clusters than the specified limit. An ellipsis sequence (by default "...") is used to designate whether the limit was reached. Use ellipsis(CharSequence) to set custom ellipsis sequence.
    The collector returned by this method is short-circuiting: it may not process all the input elements if the limit is reached.
    
    Parameters:
    
    limit - the maximal number of grapheme clusters in the resulting String.
    
    Returns:
    
    a new Collector which will produce String no longer than given limit.
  - cutAnywhere
```
public Joining cutAnywhere()
```
    Returns a Collector which behaves like this collector, but cuts the resulting string at any point when limit is reached.
    The resulting collector will produce String which length is exactly equal to the specified limit if the limit is reached. If used with maxChars(int), the resulting string may be cut in the middle of surrogate pair.
    
    Returns:
    
    a new Collector which cuts the resulting string at any point when limit is reached.
  - cutAtCodePoint
```
public Joining cutAtCodePoint()
```
    Returns a Collector which behaves like this collector, but cuts the resulting string between any code points when limit is reached.
    The resulting collector will not split the surrogate pair when used with maxChars(int) or maxCodePoints(int). However it may remove the combining character which may result in incorrect rendering of the last displayed grapheme.
    
    Returns:
    
    a new Collector which cuts the resulting string between code points.
  - cutAtGrapheme
```
public Joining cutAtGrapheme()
```
    Returns a Collector which behaves like this collector, but cuts the resulting string at grapheme cluster boundary when limit is reached. This is the default behavior.
    The grapheme cluster is defined in Unicode Text Segmentation technical report. Thus the resulting collector will not split the surrogate pair and will preserve any combining characters or remove them with the base character.
    
    Returns:
    
    a new Collector which cuts the resulting string at grapheme cluster boundary.
  - cutAtWord
```
public Joining cutAtWord()
```
    Returns a Collector which behaves like this collector, but cuts the resulting string at word boundary when limit is reached.
    The beginning and end of every input stream element or delimiter is always considered as word boundary, so the stream of "one", "two three" collected with Joining.with("").maxChars(n).ellipsis("").cutAtWord() may produce the following strings depending on n:
```
 ""
 "one"
 "onetwo"
 "onetwo "
 "onetwo three"
 
```
    Returns:
    
    a new Collector which cuts the resulting string at word boundary.
  - cutBeforeDelimiter
```
public Joining cutBeforeDelimiter()
```
    Returns a Collector which behaves like this collector, but cuts the resulting string before the delimiter when limit is reached.
    
    Returns:
    
    a new Collector which cuts the resulting string at before the delimiter.
  - cutAfterDelimiter
```
public Joining cutAfterDelimiter()
```
    Returns a Collector which behaves like this collector, but cuts the resulting string after the delimiter when limit is reached.
    
    Returns:
    
    a new Collector which cuts the resulting string at after the delimiter.
  - supplier
```
public Supplier<Joining.Accumulator> supplier()
```
    Description copied from interface: java.util.stream.Collector
    
    A function that creates and returns a new mutable result container.
    
    Returns:
    
    a function which returns a new, mutable result container
  - accumulator
```
public BiConsumer<Joining.Accumulator,CharSequence> accumulator()
```
    Description copied from interface: java.util.stream.Collector
    
    A function that folds a value into a mutable result container.
    
    Returns:
    
    a function which folds a value into a mutable result container
  - combiner
```
public BinaryOperator<Joining.Accumulator> combiner()
```
    Description copied from interface: java.util.stream.Collector
    
    A function that accepts two partial results and merges them. The combiner function may fold state from one argument into the other and return that, or may return a new result container.
    
    Returns:
    
    a function which combines two partial results into a combined result
  - finisher
```
public Function<Joining.Accumulator,String> finisher()
```
    Description copied from interface: java.util.stream.Collector
    
    Perform the final transformation from the intermediate accumulation type A to the final result type R.
    If the characteristic IDENTITY_TRANSFORM is set, this function may be presumed to be an identity transform with an unchecked cast from A to R.
    
    Returns:
    
    a function which transforms the intermediate result to the final result
  - characteristics
```
public Set<Collector.Characteristics> characteristics()
```
    Description copied from interface: java.util.stream.Collector
    
    Returns a Set of Collector.Characteristics indicating the characteristics of this Collector. This set should be immutable.
    
    Returns:
    
    an immutable set of collector characteristics

Class Joining

Nested Class Summary

Nested classes/interfaces inherited from interface Collector

Method Summary

Methods inherited from class Object

Methods inherited from interface Collector

Method Detail

with

wrap

ellipsis

maxChars

maxCodePoints

maxGraphemes

cutAnywhere

cutAtCodePoint

cutAtGrapheme

cutAtWord

cutBeforeDelimiter

cutAfterDelimiter

supplier

accumulator

combiner

finisher

characteristics