Package org.glassfish.jersey.internal.guava

Class Joiner

java.lang.Object

org.glassfish.jersey.internal.guava.Joiner

public class Joiner
extends Object

An object which joins pieces of text (specified as an array, Iterable, varargs or even a Map) with a separator. It either appends the results to an Appendable or returns them as a String. Example:

   
 <p>
   Joiner joiner = Joiner.on("; ").skipNulls();
    . . .
   return joiner.join("Harry", null, "Ron", "Hermione");

This returns the string "Harry; Ron; Hermione". Note that all input elements are converted to strings using Object.toString() before being appended.

If neither #skipNulls() nor #useForNull(String) is specified, the joining methods will throw NullPointerException if any given element is null.

Warning: joiner instances are always immutable; a configuration method such as useForNull has no effect on the instance it is invoked on! You must store and use the new joiner instance returned by the method. This makes joiners thread-safe, and safe to store as static final constants.

   
 <p>
   // Bad! Do not do this!
   Joiner joiner = Joiner.on(',');
   joiner.skipNulls(); // does nothing!
   return joiner.join("wrong", null, "wrong");

See the Guava User Guide article on Joiner.

Since:

2.0 (imported from Google Collections Library)

Author:

Kevin Bourrillion

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Joiner.MapJoiner	An object that joins map entries in the same manner as Joiner joins iterables and arrays.

Method Summary

Modifier and Type	Method	Description
static Joiner	on()	Returns a joiner which automatically places separator between consecutive elements.
Joiner.MapJoiner	withKeyValueSeparator()	Returns a MapJoiner using the given key-value separator, and the same configuration as this Joiner otherwise.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

on

public static Joiner on()

Returns a joiner which automatically places separator between consecutive elements.

withKeyValueSeparator

public Joiner.MapJoiner withKeyValueSeparator()

Returns a MapJoiner using the given key-value separator, and the same configuration as this Joiner otherwise.