eu.mais_h.mathsync

Class SummarizerFromItems

java.lang.Object

eu.mais_h.mathsync.SummarizerFromItems

All Implemented Interfaces:

Summarizer

public class SummarizerFromItems
extends Object
implements Summarizer

Summarizer which iterates on items in the current state to build summaries.

Method Summary

Methods

Modifier and Type	Method and Description
static <T> Summarizer	custom(Set<? extends T> items, Serializer<? super T> serializer, Digester digester, BucketSelector selector) Builds a custom summarizer.
static <T> Summarizer	simple(Set<? extends T> items, Serializer<? super T> serializer) Builds a simple summarizer.
Summary	summarize(int level) Produces a summary at a given level of detail.

Methods inherited from class java.lang.Object

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

Method Detail

summarize

public Summary summarize(int level)

Produces a summary at a given level of detail.

The larger detail level is, the bigger summary will consume on the wire, but the more information it conveys.

Summaries produced have a size of O(2^level).

Specified by:

summarize in interface Summarizer

Parameters:

level - the level of detail.

Returns:

a summary of the current state at the requested level of detail.

simple

public static <T> Summarizer simple(Set<? extends T> items,
                    Serializer<? super T> serializer)

Builds a simple summarizer.

Parameters:

items - the set of containing all items in the current state.

serializer - the serializer to use to serialize items.

Returns:

a summarizer with SHA-1 digester and default spread.

custom

public static <T> Summarizer custom(Set<? extends T> items,
                    Serializer<? super T> serializer,
                    Digester digester,
                    BucketSelector selector)

Builds a custom summarizer.

Parameters:

items - the set of containing all items in the current state.

serializer - the serializer to use to serialize items.

digester - the custom digester to use.

selector - the strategy to choose buckets to store items in.

Returns:

a summarizer corresponding to the input.