gaspersic/java-design-patterns
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

#184 Fluent interface pattern, added uml, adjusted style, added pattern description

Browse Source
This commit is contained in:
Hannes Pernpeintner 2015-09-07 13:25:26 +02:00
parent ee47ae021a
commit fb13ddc5d6
11 changed files with 727 additions and 535 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
faq.md
View File

@ -61,3 +61,7 @@ As for performance and scalability, pools can become bottlenecks, if all the
pooled objects are in use and more clients need them, threads will become
blocked waiting for available object from the pool. This is not the case with
Flyweight.
### Q7: What are the differences between FluentInterface and Builder patterns? {#Q7}
Fluent interfaces are sometimes confused with the Builder pattern, because they share method chaining and a fluent usage. However, fluent interfaces are not primarily used to create shared (mutable) objects, but to configure complex objects without having to respecify the target object on every property change.

BIN
fluentinterface/etc/fluentinterface.png Normal file
View File

Binary file not shown.
Side by Side

After

Width:  |  Height:  |  Size: 58 KiB

100
fluentinterface/etc/fluentinterface.ucls Normal file
View File

@ -0,0 +1,100 @@
<?xml version="1.0" encoding="UTF-8"?>
<class-diagram version="1.1.8" icons="true" automaticImage="PNG" always-add-relationships="false" generalizations="true"
realizations="true" associations="true" dependencies="false" nesting-relationships="true">
<class id="1" language="java" name="com.iluwatar.fluentinterface.App" project="fluentinterface"
file="/fluentinterface/src/main/java/com/iluwatar/fluentinterface/App.java" binary="false" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="289" y="-8"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<class id="2" language="java" name="com.iluwatar.fluentinterface.fluentiterable.simple.SimpleFluentIterable"
project="fluentinterface"
file="/fluentinterface/src/main/java/com/iluwatar/fluentinterface/fluentiterable/simple/SimpleFluentIterable.java"
binary="false" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="450" y="430"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<class id="3" language="java" name="com.iluwatar.fluentinterface.fluentiterable.lazy.LazyFluentIterable"
project="fluentinterface"
file="/fluentinterface/src/main/java/com/iluwatar/fluentinterface/fluentiterable/lazy/LazyFluentIterable.java"
binary="false" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="860" y="391"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<interface id="4" language="java" name="com.iluwatar.fluentinterface.fluentiterable.FluentIterable"
project="fluentinterface"
file="/fluentinterface/src/main/java/com/iluwatar/fluentinterface/fluentiterable/FluentIterable.java" binary="false"
corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="794" y="55"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</interface>
<class id="5" language="java" name="com.iluwatar.fluentinterface.fluentiterable.lazy.DecoratingIterator"
project="fluentinterface"
file="/fluentinterface/src/main/java/com/iluwatar/fluentinterface/fluentiterable/lazy/DecoratingIterator.java"
binary="false" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="1245" y="391"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<interface id="6" language="java" name="java.lang.Iterable" project="fluentinterface"
file="C:/Program Files/Java/jdk1.8.0/jre/lib/rt.jar" binary="true" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="793" y="-163"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</interface>
<dependency id="7">
<end type="SOURCE" refId="1"/>
<end type="TARGET" refId="3"/>
</dependency>
<dependency id="8">
<end type="SOURCE" refId="1"/>
<end type="TARGET" refId="2"/>
</dependency>
<generalization id="9">
<end type="SOURCE" refId="4"/>
<end type="TARGET" refId="6"/>
</generalization>
<realization id="10">
<end type="SOURCE" refId="3"/>
<end type="TARGET" refId="4"/>
</realization>
<dependency id="11">
<end type="SOURCE" refId="1"/>
<end type="TARGET" refId="4"/>
</dependency>
<realization id="12">
<end type="SOURCE" refId="2"/>
<end type="TARGET" refId="4"/>
</realization>
<dependency id="13">
<end type="SOURCE" refId="3"/>
<end type="TARGET" refId="5"/>
</dependency>
<classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</classifier-display>
<association-display labels="true" multiplicity="true"/>
</class-diagram>

28
fluentinterface/index.md Normal file
View File

@ -0,0 +1,28 @@
---
layout: pattern
title: Fluent Interface
folder: fluentinterface
permalink: /patterns/fluentinterface/
categories: Architectural
tags: Java
---
**Intent:** A fluent interface provides an easy-readable, flowing interface, that often mimics a domain specific language. Using this pattern results in code that can be read nearly as human language.
![Fluent Interface](./etc/fluentinterface.png "Fluent Interface")
**Applicability:** Use the Fluent Interface pattern when
* you provide an API that would benefit from a DSL-like usage
* you have objects that are difficult to configure or use
**Real world examples:**
* [Java 8 Stream API](http://www.oracle.com/technetwork/articles/java/ma14-java-se-8-streams-2177646.html)
* [Google Guava FluentInterable](https://github.com/google/guava/wiki/FunctionalExplained)
* [JOOQ](http://www.jooq.org/doc/3.0/manual/getting-started/use-cases/jooq-as-a-standalone-sql-builder/)
**Credits**
* [Fluent Interface - Martin Fowler](http://www.martinfowler.com/bliki/FluentInterface.html)
* [Evolutionary architecture and emergent design: Fluent interfaces - Neal Ford](http://www.ibm.com/developerworks/library/j-eaed14/)

2
fluentinterface/pom.xml
View File

@ -5,7 +5,7 @@
<parent>
<artifactId>java-design-patterns</artifactId>
<groupId>com.iluwatar</groupId>
<version>1.5.0</version>
<version>1.6.0</version>
</parent>
<modelVersion>4.0.0</modelVersion>

174
fluentinterface/src/main/java/com/iluwatar/fluentinterface/App.java
View File

@ -1,5 +1,6 @@
package com.iluwatar.fluentinterface;
import com.iluwatar.fluentinterface.fluentiterable.FluentIterable;
import com.iluwatar.fluentinterface.fluentiterable.lazy.LazyFluentIterable;
import com.iluwatar.fluentinterface.fluentiterable.simple.SimpleFluentIterable;
@ -9,96 +10,113 @@ import java.util.function.Predicate;
import static java.lang.String.valueOf;
/**
* Fluent interface pattern is useful when you want to provide an easy readable, flowing API. Those
* interfaces tend to mimic domain specific languages, so they can nearly be read as human
* languages.
* <p>
* In this example two implementations of a {@link FluentIterable} interface are given. The
* SimpleFluentIterable evaluates eagerly and would be too costly for real world applications. The
* LazyFluentIterable is evaluated on termination. Their usage is demonstrated with a simple number
* list that is filtered, transformed and collected. The result is printed afterwards.
* <p>
*/
public class App {
public static void main(String[] args) {
public static void main(String[] args) {
List<Integer> integerList = new ArrayList<Integer>() {{
add(1);
add(-61);
add(14);
add(-22);
add(18);
add(-87);
add(6);
add(64);
add(-82);
add(26);
add(-98);
add(97);
add(45);
add(23);
add(2);
add(-68);
add(45);
}};
prettyPrint("The initial list contains: ", integerList);
List<Integer> integerList = new ArrayList<Integer>() {
{
add(1);
add(-61);
add(14);
add(-22);
add(18);
add(-87);
add(6);
add(64);
add(-82);
add(26);
add(-98);
add(97);
add(45);
add(23);
add(2);
add(-68);
add(45);
}
};
prettyPrint("The initial list contains: ", integerList);
List<Integer> firstFiveNegatives = SimpleFluentIterable.from(integerList)
.filter(negatives())
.first(3)
.asList();
prettyPrint("The first three negative values are: ", firstFiveNegatives);
List<Integer> firstFiveNegatives =
SimpleFluentIterable.fromCopyOf(integerList).filter(negatives()).first(3).asList();
prettyPrint("The first three negative values are: ", firstFiveNegatives);
List<Integer> lastTwoPositives = SimpleFluentIterable.from(integerList)
.filter(positives())
.last(2)
.asList();
prettyPrint("The last two positive values are: ", lastTwoPositives);
List<Integer> lastTwoPositives =
SimpleFluentIterable.fromCopyOf(integerList).filter(positives()).last(2).asList();
prettyPrint("The last two positive values are: ", lastTwoPositives);
SimpleFluentIterable.from(integerList)
.filter(number -> number%2 == 0)
.first()
.ifPresent(evenNumber -> System.out.println(String.format("The first even number is: %d", evenNumber)));
SimpleFluentIterable
.fromCopyOf(integerList)
.filter(number -> number % 2 == 0)
.first()
.ifPresent(
evenNumber -> System.out.println(String.format("The first even number is: %d",
evenNumber)));
List<String> transformedList = SimpleFluentIterable.from(integerList)
.filter(negatives())
.map(transformToString())
.asList();
prettyPrint("A string-mapped list of negative numbers contains: ", transformedList);
List<String> transformedList =
SimpleFluentIterable.fromCopyOf(integerList).filter(negatives()).map(transformToString())
.asList();
prettyPrint("A string-mapped list of negative numbers contains: ", transformedList);
List<String> lastTwoOfFirstFourStringMapped = LazyFluentIterable.from(integerList)
.filter(positives())
.first(4)
.last(2)
.map(number -> "String[" + String.valueOf(number) + "]")
.asList();
prettyPrint("The lazy list contains the last two of the first four positive numbers mapped to Strings: ", lastTwoOfFirstFourStringMapped);
List<String> lastTwoOfFirstFourStringMapped =
LazyFluentIterable.from(integerList).filter(positives()).first(4).last(2)
.map(number -> "String[" + String.valueOf(number) + "]").asList();
prettyPrint(
"The lazy list contains the last two of the first four positive numbers mapped to Strings: ",
lastTwoOfFirstFourStringMapped);
LazyFluentIterable.from(integerList)
.filter(negatives())
.first(2)
.last()
.ifPresent(lastOfFirstTwo -> System.out.println(String.format("The last of the first two negatives is: %d", lastOfFirstTwo)));
LazyFluentIterable
.from(integerList)
.filter(negatives())
.first(2)
.last()
.ifPresent(
lastOfFirstTwo -> System.out.println(String.format(
"The last of the first two negatives is: %d", lastOfFirstTwo)));
}
private static Function<Integer, String> transformToString() {
return integer -> "String[" + valueOf(integer) + "]";
}
private static Predicate<? super Integer> negatives() {
return integer -> (integer < 0);
}
private static Predicate<? super Integer> positives() {
return integer -> (integer > 0);
}
private static <TYPE> void prettyPrint(String prefix, Iterable<TYPE> iterable) {
prettyPrint(", ", prefix, ".", iterable);
}
private static <TYPE> void prettyPrint(String prefix, String suffix, Iterable<TYPE> iterable) {
prettyPrint(", ", prefix, suffix, iterable);
}
private static <TYPE> void prettyPrint(String delimiter, String prefix, String suffix,
Iterable<TYPE> iterable) {
StringJoiner joiner = new StringJoiner(delimiter, prefix, ".");
Iterator<TYPE> iterator = iterable.iterator();
while (iterator.hasNext()) {
joiner.add(iterator.next().toString());
}
private static Function<Integer, String> transformToString() {
return integer -> "String[" + valueOf(integer) + "]";
}
private static Predicate<? super Integer> negatives() {
return integer -> (integer < 0);
}
private static Predicate<? super Integer> positives() {
return integer -> (integer > 0);
}
private static <TYPE> void prettyPrint(String prefix, Iterable<TYPE> iterable) {
prettyPrint(", ", prefix, ".", iterable);
}
private static <TYPE> void prettyPrint(String prefix, String suffix, Iterable<TYPE> iterable) {
prettyPrint(", ", prefix, suffix, iterable);
}
private static <TYPE> void prettyPrint(String delimiter, String prefix, String suffix, Iterable<TYPE> iterable) {
StringJoiner joiner = new StringJoiner(delimiter, prefix, ".");
Iterator<TYPE> iterator = iterable.iterator();
while (iterator.hasNext()) {
joiner.add(iterator.next().toString());
}
System.out.println(joiner);
}
System.out.println(joiner);
}
}

123
fluentinterface/src/main/java/com/iluwatar/fluentinterface/fluentiterable/FluentIterable.java
View File

@ -8,73 +8,82 @@ import java.util.function.Function;
import java.util.function.Predicate;
/**
* The FluentIterable is a more convenient implementation of the common iterable interface based
* on the fluent interface design pattern.
* This interface defines common operations, but
* doesn't aim to be complete. It was inspired by Guava's com.google.common.collect.FluentIterable.
* The FluentIterable is a more convenient implementation of the common iterable interface based on
* the fluent interface design pattern. This interface defines common operations, but doesn't aim to
* be complete. It was inspired by Guava's com.google.common.collect.FluentIterable.
*
* @param <TYPE> is the class of objects the iterable contains
*/
public interface FluentIterable<TYPE> extends Iterable<TYPE> {
/**
* Filters the contents of Iterable using the given predicate, leaving only the ones which satisfy the predicate.
* @param predicate the condition to test with for the filtering. If the test
* is negative, the tested object is removed by the iterator.
* @return a filtered FluentIterable
*/
FluentIterable<TYPE> filter(Predicate<? super TYPE> predicate);
/**
* Filters the contents of Iterable using the given predicate, leaving only the ones which satisfy
* the predicate.
*
* @param predicate the condition to test with for the filtering. If the test is negative, the
* tested object is removed by the iterator.
* @return a filtered FluentIterable
*/
FluentIterable<TYPE> filter(Predicate<? super TYPE> predicate);
/**
* Returns an Optional containing the first element of this iterable if present,
* else returns Optional.empty().
* @return the first element after the iteration is evaluated
*/
Optional<TYPE> first();
/**
* Returns an Optional containing the first element of this iterable if present, else returns
* Optional.empty().
*
* @return the first element after the iteration is evaluated
*/
Optional<TYPE> first();
/**
* Evaluates the iteration and leaves only the count first elements.
* @return the first count elements as an Iterable
*/
FluentIterable<TYPE> first(int count);
/**
* Evaluates the iteration and leaves only the count first elements.
*
* @return the first count elements as an Iterable
*/
FluentIterable<TYPE> first(int count);
/**
* Evaluates the iteration and returns the last element. This is a terminating operation.
* @return the last element after the iteration is evaluated
*/
Optional<TYPE> last();
/**
* Evaluates the iteration and returns the last element. This is a terminating operation.
*
* @return the last element after the iteration is evaluated
*/
Optional<TYPE> last();
/**
* Evaluates the iteration and leaves only the count last elements.
* @return the last counts elements as an Iterable
*/
FluentIterable<TYPE> last(int count);
/**
* Evaluates the iteration and leaves only the count last elements.
*
* @return the last counts elements as an Iterable
*/
FluentIterable<TYPE> last(int count);
/**
* Transforms this FluentIterable into a new one containing objects of the type NEW_TYPE.
* @param function a function that transforms an instance of TYPE into an instance of NEW_TYPE
* @param <NEW_TYPE> the target type of the transformation
* @return a new FluentIterable of the new type
*/
<NEW_TYPE> FluentIterable<NEW_TYPE> map(Function<? super TYPE, NEW_TYPE> function);
/**
* Transforms this FluentIterable into a new one containing objects of the type NEW_TYPE.
*
* @param function a function that transforms an instance of TYPE into an instance of NEW_TYPE
* @param <NEW_TYPE> the target type of the transformation
* @return a new FluentIterable of the new type
*/
<NEW_TYPE> FluentIterable<NEW_TYPE> map(Function<? super TYPE, NEW_TYPE> function);
/**
* Returns the contents of this Iterable as a List.
* @return a List representation of this Iterable
*/
List<TYPE> asList();
/**
* Returns the contents of this Iterable as a List.
*
* @return a List representation of this Iterable
*/
List<TYPE> asList();
/**
* Utility method that iterates over iterable and adds the contents to a list.
* @param iterable the iterable to collect
* @param <TYPE> the type of the objects to iterate
* @return a list with all objects of the given iterator
*/
static <TYPE> List<TYPE> copyToList(Iterable<TYPE> iterable) {
ArrayList<TYPE> copy = new ArrayList<>();
Iterator<TYPE> iterator = iterable.iterator();
while (iterator.hasNext()) {
copy.add(iterator.next());
}
return copy;
/**
* Utility method that iterates over iterable and adds the contents to a list.
*
* @param iterable the iterable to collect
* @param <TYPE> the type of the objects to iterate
* @return a list with all objects of the given iterator
*/
static <TYPE> List<TYPE> copyToList(Iterable<TYPE> iterable) {
ArrayList<TYPE> copy = new ArrayList<>();
Iterator<TYPE> iterator = iterable.iterator();
while (iterator.hasNext()) {
copy.add(iterator.next());
}
return copy;
}
}

87
fluentinterface/src/main/java/com/iluwatar/fluentinterface/fluentiterable/lazy/DecoratingIterator.java
View File

@ -3,53 +3,58 @@ package com.iluwatar.fluentinterface.fluentiterable.lazy;
import java.util.Iterator;
/**
* This class is used to realize LazyFluentIterables. It decorates
* a given iterator. Does not support consecutive hasNext() calls.
* This class is used to realize LazyFluentIterables. It decorates a given iterator. Does not
* support consecutive hasNext() calls.
*
* @param <TYPE>
*/
public abstract class DecoratingIterator<TYPE> implements Iterator<TYPE> {
protected final Iterator<TYPE> fromIterator;
protected final Iterator<TYPE> fromIterator;
private TYPE next = null;
private TYPE next = null;
/**
* Creates an iterator that decorates the given iterator.
* @param fromIterator
*/
public DecoratingIterator(Iterator<TYPE> fromIterator) {
this.fromIterator = fromIterator;
/**
* Creates an iterator that decorates the given iterator.
*
* @param fromIterator
*/
public DecoratingIterator(Iterator<TYPE> fromIterator) {
this.fromIterator = fromIterator;
}
/**
* Precomputes and saves the next element of the Iterable. null is considered as end of data.
*
* @return true if a next element is available
*/
@Override
public final boolean hasNext() {
next = computeNext();
return next != null;
}
/**
* Returns the next element of the Iterable.
*
* @return the next element of the Iterable, or null if not present.
*/
@Override
public final TYPE next() {
if (next == null) {
return fromIterator.next();
} else {
final TYPE result = next;
next = null;
return result;
}
}
/**
* Precomputes and saves the next element of the Iterable. null is considered as end of data.
* @return true if a next element is available
*/
@Override
public final boolean hasNext() {
next = computeNext();
return next != null;
}
/**
* Returns the next element of the Iterable.
* @return the next element of the Iterable, or null if not present.
*/
@Override
public final TYPE next() {
if (next == null) {
return fromIterator.next();
} else {
final TYPE result = next;
next = null;
return result;
}
}
/**
* Computes the next object of the Iterable. Can be implemented to
* realize custom behaviour for an iteration process. null is considered as end of data.
* @return the next element of the Iterable.
*/
public abstract TYPE computeNext();
/**
* Computes the next object of the Iterable. Can be implemented to realize custom behaviour for an
* iteration process. null is considered as end of data.
*
* @return the next element of the Iterable.
*/
public abstract TYPE computeNext();
}

400
fluentinterface/src/main/java/com/iluwatar/fluentinterface/fluentiterable/lazy/LazyFluentIterable.java
View File

@ -11,209 +11,221 @@ import java.util.function.Function;
import java.util.function.Predicate;
/**
* This is a lazy implementation of the FluentIterable interface. It evaluates
* all chained operations when a terminating operation is applied.
* This is a lazy implementation of the FluentIterable interface. It evaluates all chained
* operations when a terminating operation is applied.
*
* @param <TYPE> the type of the objects the iteration is about
*/
public class LazyFluentIterable<TYPE> implements FluentIterable<TYPE> {
private final Iterable<TYPE> iterable;
private final Iterable<TYPE> iterable;
/**
* This constructor creates a new LazyFluentIterable. It wraps the
* given iterable.
* @param iterable the iterable this FluentIterable works on.
*/
protected LazyFluentIterable(Iterable<TYPE> iterable) {
this.iterable = iterable;
}
/**
* This constructor creates a new LazyFluentIterable. It wraps the given iterable.
*
* @param iterable the iterable this FluentIterable works on.
*/
protected LazyFluentIterable(Iterable<TYPE> iterable) {
this.iterable = iterable;
}
/**
* This constructor can be used to implement anonymous subclasses
* of the LazyFluentIterable.
*/
protected LazyFluentIterable() {
iterable = this;
}
/**
* This constructor can be used to implement anonymous subclasses of the LazyFluentIterable.
*/
protected LazyFluentIterable() {
iterable = this;
}
/**
* Filters the contents of Iterable using the given predicate, leaving only the ones which satisfy the predicate.
* @param predicate the condition to test with for the filtering. If the test
* is negative, the tested object is removed by the iterator.
* @return a new FluentIterable object that decorates the source iterable
*/
@Override
public FluentIterable<TYPE> filter(Predicate<? super TYPE> predicate) {
return new LazyFluentIterable<TYPE>() {
@Override
public Iterator<TYPE> iterator() {
return new DecoratingIterator<TYPE>(iterable.iterator()) {
@Override
public TYPE computeNext() {
while(fromIterator.hasNext()) {
TYPE candidate = fromIterator.next();
if(!predicate.test(candidate)) {
continue;
}
return candidate;
}
return null;
}
};
}
};
}
/**
* Can be used to collect objects from the iteration. Is a terminating operation.
* @return an Optional containing the first object of this Iterable
*/
@Override
public Optional<TYPE> first() {
Iterator<TYPE> resultIterator = first(1).iterator();
return resultIterator.hasNext() ? Optional.of(resultIterator.next()) : Optional.empty();
}
/**
* Can be used to collect objects from the iteration.
* @param count defines the number of objects to return
* @return the same FluentIterable with a collection decimated to a maximum of 'count' first objects.
*/
@Override
public FluentIterable<TYPE> first(int count) {
return new LazyFluentIterable<TYPE>() {
@Override
public Iterator<TYPE> iterator() {
return new DecoratingIterator<TYPE>(iterable.iterator()) {
int currentIndex = 0;
@Override
public TYPE computeNext() {
if(currentIndex < count) {
if(fromIterator.hasNext()) {
TYPE candidate = fromIterator.next();
currentIndex++;
return candidate;
}
}
return null;
}
};
}
};
}
/**
* Can be used to collect objects from the iteration. Is a terminating operation.
* @return an Optional containing the last object of this Iterable
*/
@Override
public Optional<TYPE> last() {
Iterator<TYPE> resultIterator = last(1).iterator();
return resultIterator.hasNext() ? Optional.of(resultIterator.next()) : Optional.empty();
}
/**
* Can be used to collect objects from the Iterable. Is a terminating operation.
* This operation is memory intensive, because the contents of this Iterable
* are collected into a List, when the next object is requested.
* @param count defines the number of objects to return
* @return the same FluentIterable with a collection decimated to a maximum of 'count' last objects
*/
@Override
public FluentIterable<TYPE> last(int count) {return new LazyFluentIterable<TYPE>() {
@Override
public Iterator<TYPE> iterator() {
return new DecoratingIterator<TYPE>(iterable.iterator()) {
public int stopIndex;
public int totalElementsCount;
private List<TYPE> list;
private int currentIndex = 0;
@Override
public TYPE computeNext() {
initialize();
TYPE candidate = null;
while(currentIndex < stopIndex && fromIterator.hasNext()) {
currentIndex++;
fromIterator.next();
}
if(currentIndex >= stopIndex && fromIterator.hasNext()) {
candidate = fromIterator.next();
}
return candidate;
}
private void initialize() {
if(list == null) {
list = new ArrayList<>();
Iterator<TYPE> newIterator = iterable.iterator();
while(newIterator.hasNext()) {
list.add(newIterator.next());
}
totalElementsCount = list.size();
stopIndex = totalElementsCount - count;
}
}
};
}
};
}
/**
* Transforms this FluentIterable into a new one containing objects of the type NEW_TYPE.
* @param function a function that transforms an instance of TYPE into an instance of NEW_TYPE
* @param <NEW_TYPE> the target type of the transformation
* @return a new FluentIterable of the new type
*/
@Override
public <NEW_TYPE> FluentIterable<NEW_TYPE> map(Function<? super TYPE, NEW_TYPE> function) {
return new LazyFluentIterable<NEW_TYPE>() {
@Override
public Iterator<NEW_TYPE> iterator() {
return new DecoratingIterator<NEW_TYPE>(null) {
Iterator<TYPE> oldTypeIterator = iterable.iterator();
@Override
public NEW_TYPE computeNext() {
while(oldTypeIterator.hasNext()) {
TYPE candidate = oldTypeIterator.next();
return function.apply(candidate);
}
return null;
}
};
}
};
}
/**
* Collects all remaining objects of this iteration into a list.
* @return a list with all remaining objects of this iteration
*/
@Override
public List<TYPE> asList() {
List<TYPE> copy = FluentIterable.copyToList(iterable);
return copy;
}
@Override
public Iterator<TYPE> iterator() {
/**
* Filters the contents of Iterable using the given predicate, leaving only the ones which satisfy
* the predicate.
*
* @param predicate the condition to test with for the filtering. If the test is negative, the
* tested object is removed by the iterator.
* @return a new FluentIterable object that decorates the source iterable
*/
@Override
public FluentIterable<TYPE> filter(Predicate<? super TYPE> predicate) {
return new LazyFluentIterable<TYPE>() {
@Override
public Iterator<TYPE> iterator() {
return new DecoratingIterator<TYPE>(iterable.iterator()) {
@Override
public TYPE computeNext() {
return fromIterator.next();
@Override
public TYPE computeNext() {
while (fromIterator.hasNext()) {
TYPE candidate = fromIterator.next();
if (!predicate.test(candidate)) {
continue;
}
return candidate;
}
};
}
/**
* @return a FluentIterable from a given iterable. Calls the LazyFluentIterable constructor.
*/
public static final <TYPE> FluentIterable<TYPE> from(Iterable<TYPE> iterable) {
return new LazyFluentIterable<>(iterable);
}
return null;
}
};
}
};
}
/**
* Can be used to collect objects from the iteration. Is a terminating operation.
*
* @return an Optional containing the first object of this Iterable
*/
@Override
public Optional<TYPE> first() {
Iterator<TYPE> resultIterator = first(1).iterator();
return resultIterator.hasNext() ? Optional.of(resultIterator.next()) : Optional.empty();
}
/**
* Can be used to collect objects from the iteration.
*
* @param count defines the number of objects to return
* @return the same FluentIterable with a collection decimated to a maximum of 'count' first
* objects.
*/
@Override
public FluentIterable<TYPE> first(int count) {
return new LazyFluentIterable<TYPE>() {
@Override
public Iterator<TYPE> iterator() {
return new DecoratingIterator<TYPE>(iterable.iterator()) {
int currentIndex = 0;
@Override
public TYPE computeNext() {
if (currentIndex < count) {
if (fromIterator.hasNext()) {
TYPE candidate = fromIterator.next();
currentIndex++;
return candidate;
}
}
return null;
}
};
}
};
}
/**
* Can be used to collect objects from the iteration. Is a terminating operation.
*
* @return an Optional containing the last object of this Iterable
*/
@Override
public Optional<TYPE> last() {
Iterator<TYPE> resultIterator = last(1).iterator();
return resultIterator.hasNext() ? Optional.of(resultIterator.next()) : Optional.empty();
}
/**
* Can be used to collect objects from the Iterable. Is a terminating operation. This operation is
* memory intensive, because the contents of this Iterable are collected into a List, when the
* next object is requested.
*
* @param count defines the number of objects to return
* @return the same FluentIterable with a collection decimated to a maximum of 'count' last
* objects
*/
@Override
public FluentIterable<TYPE> last(int count) {
return new LazyFluentIterable<TYPE>() {
@Override
public Iterator<TYPE> iterator() {
return new DecoratingIterator<TYPE>(iterable.iterator()) {
private int stopIndex;
private int totalElementsCount;
private List<TYPE> list;
private int currentIndex = 0;
@Override
public TYPE computeNext() {
initialize();
TYPE candidate = null;
while (currentIndex < stopIndex && fromIterator.hasNext()) {
currentIndex++;
fromIterator.next();
}
if (currentIndex >= stopIndex && fromIterator.hasNext()) {
candidate = fromIterator.next();
}
return candidate;
}
private void initialize() {
if (list == null) {
list = new ArrayList<>();
Iterator<TYPE> newIterator = iterable.iterator();
while (newIterator.hasNext()) {
list.add(newIterator.next());
}
totalElementsCount = list.size();
stopIndex = totalElementsCount - count;
}
}
};
}
};
}
/**
* Transforms this FluentIterable into a new one containing objects of the type NEW_TYPE.
*
* @param function a function that transforms an instance of TYPE into an instance of NEW_TYPE
* @param <NEW_TYPE> the target type of the transformation
* @return a new FluentIterable of the new type
*/
@Override
public <NEW_TYPE> FluentIterable<NEW_TYPE> map(Function<? super TYPE, NEW_TYPE> function) {
return new LazyFluentIterable<NEW_TYPE>() {
@Override
public Iterator<NEW_TYPE> iterator() {
return new DecoratingIterator<NEW_TYPE>(null) {
Iterator<TYPE> oldTypeIterator = iterable.iterator();
@Override
public NEW_TYPE computeNext() {
while (oldTypeIterator.hasNext()) {
TYPE candidate = oldTypeIterator.next();
return function.apply(candidate);
}
return null;
}
};
}
};
}
/**
* Collects all remaining objects of this iteration into a list.
*
* @return a list with all remaining objects of this iteration
*/
@Override
public List<TYPE> asList() {
List<TYPE> copy = FluentIterable.copyToList(iterable);
return copy;
}
@Override
public Iterator<TYPE> iterator() {
return new DecoratingIterator<TYPE>(iterable.iterator()) {
@Override
public TYPE computeNext() {
return fromIterator.next();
}
};
}
/**
* @return a FluentIterable from a given iterable. Calls the LazyFluentIterable constructor.
*/
public static final <TYPE> FluentIterable<TYPE> from(Iterable<TYPE> iterable) {
return new LazyFluentIterable<>(iterable);
}
}

334
fluentinterface/src/main/java/com/iluwatar/fluentinterface/fluentiterable/simple/SimpleFluentIterable.java
View File

@ -8,175 +8,191 @@ import java.util.function.Function;
import java.util.function.Predicate;
/**
* This is a simple implementation of the FluentIterable interface. It evaluates
* all chained operations eagerly.
* This implementation would be costly to be utilized in real applications.
* This is a simple implementation of the FluentIterable interface. It evaluates all chained
* operations eagerly. This implementation would be costly to be utilized in real applications.
*
* @param <TYPE> the type of the objects the iteration is about
*/
public class SimpleFluentIterable<TYPE> implements FluentIterable<TYPE> {
private final Iterable<TYPE> iterable;
private final Iterable<TYPE> iterable;
/**
* This constructor creates a copy of a given iterable's contents.
* @param iterable the iterable this interface copies to work on.
*/
protected SimpleFluentIterable(Iterable<TYPE> iterable) {
List<TYPE> copy = FluentIterable.copyToList(iterable);
this.iterable = copy;
/**
* This constructor creates a copy of a given iterable's contents.
*
* @param iterable the iterable this interface copies to work on.
*/
protected SimpleFluentIterable(Iterable<TYPE> iterable) {
this.iterable = iterable;
}
/**
* Filters the contents of Iterable using the given predicate, leaving only the ones which satisfy
* the predicate.
*
* @param predicate the condition to test with for the filtering. If the test is negative, the
* tested object is removed by the iterator.
* @return the same FluentIterable with a filtered collection
*/
@Override
public final FluentIterable<TYPE> filter(Predicate<? super TYPE> predicate) {
Iterator<TYPE> iterator = iterator();
while (iterator.hasNext()) {
TYPE nextElement = iterator.next();
if (!predicate.test(nextElement)) {
iterator.remove();
}
}
return this;
}
/**
* Can be used to collect objects from the Iterable. Is a terminating operation.
*
* @return an option of the first object of the Iterable
*/
@Override
public final Optional<TYPE> first() {
Iterator<TYPE> resultIterator = first(1).iterator();
return resultIterator.hasNext() ? Optional.of(resultIterator.next()) : Optional.empty();
}
/**
* Can be used to collect objects from the Iterable. Is a terminating operation.
*
* @param count defines the number of objects to return
* @return the same FluentIterable with a collection decimated to a maximum of 'count' first
* objects.
*/
@Override
public final FluentIterable<TYPE> first(int count) {
Iterator<TYPE> iterator = iterator();
int currentCount = 0;
while (iterator.hasNext()) {
iterator.next();
if (currentCount >= count) {
iterator.remove();
}
currentCount++;
}
return this;
}
/**
* Can be used to collect objects from the Iterable. Is a terminating operation.
*
* @return an option of the last object of the Iterable
*/
@Override
public final Optional<TYPE> last() {
List<TYPE> list = last(1).asList();
if (list.isEmpty()) {
return Optional.empty();
}
return Optional.of(list.get(0));
}
/**
* Can be used to collect objects from the Iterable. Is a terminating operation.
*
* @param count defines the number of objects to return
* @return the same FluentIterable with a collection decimated to a maximum of 'count' last
* objects
*/
@Override
public final FluentIterable<TYPE> last(int count) {
int remainingElementsCount = getRemainingElementsCount();
Iterator<TYPE> iterator = iterator();
int currentIndex = 0;
while (iterator.hasNext()) {
iterator.next();
if (currentIndex < remainingElementsCount - count) {
iterator.remove();
}
currentIndex++;
}
/**
* Filters the contents of Iterable using the given predicate, leaving only the ones which satisfy the predicate.
* @param predicate the condition to test with for the filtering. If the test
* is negative, the tested object is removed by the iterator.
* @return the same FluentIterable with a filtered collection
*/
@Override
public final FluentIterable<TYPE> filter(Predicate<? super TYPE> predicate) {
Iterator<TYPE> iterator = iterator();
while (iterator.hasNext()) {
TYPE nextElement = iterator.next();
if(!predicate.test(nextElement)) {
iterator.remove();
}
}
return this;
return this;
}
/**
* Transforms this FluentIterable into a new one containing objects of the type NEW_TYPE.
*
* @param function a function that transforms an instance of TYPE into an instance of NEW_TYPE
* @param <NEW_TYPE> the target type of the transformation
* @return a new FluentIterable of the new type
*/
@Override
public final <NEW_TYPE> FluentIterable<NEW_TYPE> map(Function<? super TYPE, NEW_TYPE> function) {
List<NEW_TYPE> temporaryList = new ArrayList();
Iterator<TYPE> iterator = iterator();
while (iterator.hasNext()) {
temporaryList.add(function.apply(iterator.next()));
}
return from(temporaryList);
}
/**
* Can be used to collect objects from the Iterable. Is a terminating operation.
* @return an option of the first object of the Iterable
*/
@Override
public final Optional<TYPE> first() {
Iterator<TYPE> resultIterator = first(1).iterator();
return resultIterator.hasNext() ? Optional.of(resultIterator.next()) : Optional.empty();
/**
* Collects all remaining objects of this Iterable into a list.
*
* @return a list with all remaining objects of this Iterable
*/
@Override
public List<TYPE> asList() {
return toList(iterable.iterator());
}
/**
* @return a FluentIterable from a given iterable. Calls the SimpleFluentIterable constructor.
*/
public static final <TYPE> FluentIterable<TYPE> from(Iterable<TYPE> iterable) {
return new SimpleFluentIterable<>(iterable);
}
public static final <TYPE> FluentIterable<TYPE> fromCopyOf(Iterable<TYPE> iterable) {
List<TYPE> copy = FluentIterable.copyToList(iterable);
return new SimpleFluentIterable<>(copy);
}
@Override
public Iterator<TYPE> iterator() {
return iterable.iterator();
}
@Override
public void forEach(Consumer<? super TYPE> action) {
iterable.forEach(action);
}
@Override
public Spliterator<TYPE> spliterator() {
return iterable.spliterator();
}
/**
* @return the count of remaining objects of the current Iterable
*/
public final int getRemainingElementsCount() {
int counter = 0;
Iterator<TYPE> iterator = iterator();
while (iterator.hasNext()) {
iterator.next();
counter++;
}
return counter;
}
/**
* Can be used to collect objects from the Iterable. Is a terminating operation.
* @param count defines the number of objects to return
* @return the same FluentIterable with a collection decimated to a maximum of 'count' first objects.
*/
@Override
public final FluentIterable<TYPE> first(int count) {
Iterator<TYPE> iterator = iterator();
int currentCount = 0;
while (iterator.hasNext()) {
iterator.next();
if(currentCount >= count) {
iterator.remove();
}
currentCount++;
}
return this;
}
/**
* Can be used to collect objects from the Iterable. Is a terminating operation.
* @return an option of the last object of the Iterable
*/
@Override
public final Optional<TYPE> last() {
List<TYPE> list = last(1).asList();
if(list.isEmpty()) {
return Optional.empty();
}
return Optional.of(list.get(0));
}
/**
* Can be used to collect objects from the Iterable. Is a terminating operation.
* @param count defines the number of objects to return
* @return the same FluentIterable with a collection decimated to a maximum of 'count' last objects
*/
@Override
public final FluentIterable<TYPE> last(int count) {
int remainingElementsCount = getRemainingElementsCount();
Iterator<TYPE> iterator = iterator();
int currentIndex = 0;
while (iterator.hasNext()) {
iterator.next();
if(currentIndex < remainingElementsCount - count) {
iterator.remove();
}
currentIndex++;
}
return this;
}
/**
* Transforms this FluentIterable into a new one containing objects of the type NEW_TYPE.
* @param function a function that transforms an instance of TYPE into an instance of NEW_TYPE
* @param <NEW_TYPE> the target type of the transformation
* @return a new FluentIterable of the new type
*/
@Override
public final <NEW_TYPE> FluentIterable<NEW_TYPE> map(Function<? super TYPE, NEW_TYPE> function) {
List<NEW_TYPE> temporaryList = new ArrayList();
Iterator<TYPE> iterator = iterator();
while (iterator.hasNext()) {
temporaryList.add(function.apply(iterator.next()));
}
return from(temporaryList);
}
/**
* Collects all remaining objects of this Iterable into a list.
* @return a list with all remaining objects of this Iterable
*/
@Override
public List<TYPE> asList() {
return toList(iterable.iterator());
}
/**
* @return a FluentIterable from a given iterable. Calls the SimpleFluentIterable constructor.
*/
public static final <TYPE> FluentIterable<TYPE> from(Iterable<TYPE> iterable) {
return new SimpleFluentIterable<>(iterable);
}
@Override
public Iterator<TYPE> iterator() {
return iterable.iterator();
}
@Override
public void forEach(Consumer<? super TYPE> action) {
iterable.forEach(action);
}
@Override
public Spliterator<TYPE> spliterator() {
return iterable.spliterator();
}
/**
* @return the count of remaining objects of the current Iterable
*/
public final int getRemainingElementsCount() {
int counter = 0;
Iterator<TYPE> iterator = iterator();
while(iterator.hasNext()) {
iterator.next();
counter++;
}
return counter;
}
/**
* Collects the remaining objects of the given iterator into a List.
* @return a new List with the remaining objects.
*/
public static <TYPE> List<TYPE> toList(Iterator<TYPE> iterator) {
List<TYPE> copy = new ArrayList<>();
while (iterator.hasNext()) {
copy.add(iterator.next());
}
return copy;
/**
* Collects the remaining objects of the given iterator into a List.
*
* @return a new List with the remaining objects.
*/
public static <TYPE> List<TYPE> toList(Iterator<TYPE> iterator) {
List<TYPE> copy = new ArrayList<>();
while (iterator.hasNext()) {
copy.add(iterator.next());
}
return copy;
}
}

10
fluentinterface/src/test/java/com/iluwatar/fluentinterface/AppTest.java
View File

@ -4,9 +4,9 @@ import org.junit.Test;
public class AppTest {
@Test
public void test() {
String[] args = {};
App.main(args);
}
@Test
public void test() {
String[] args = {};
App.main(args);
}
}