org.apache.ignite.internal.util.lang.gridfunc

Class StringConcatReducer

java.lang.Object

org.apache.ignite.internal.util.lang.gridfunc.StringConcatReducer

All Implemented Interfaces:

Serializable, IgniteReducer<String,String>

public class StringConcatReducer
extends Object
implements IgniteReducer<String,String>

Reducer that concatenates strings using provided delimiter.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
StringConcatReducer(String delim)

Method Summary

Modifier and Type	Method and Description
boolean	collect(String s) Collects given value.
String	reduce() Reduces collected values into one.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

StringConcatReducer

public StringConcatReducer(String delim)

Parameters:

delim - Delimiter (optional).

Method Detail

collect

public boolean collect(String s)

Collects given value. If this method returns false then IgniteReducer.reduce() will be called right away. Otherwise caller will continue collecting until all values are processed.

Specified by:

collect in interface IgniteReducer<String,String>

Parameters:

s - Value to collect.

Returns:

true to continue collecting, false to instruct caller to stop collecting and call IgniteReducer.reduce() method.

reduce

public String reduce()

Reduces collected values into one.

Specified by:

reduce in interface IgniteReducer<String,String>

Returns:

Reduced value.

toString

public String toString()

Overrides:

toString in class Object