[JavaScript,Java,C#,C++,Ruby,Perl,PHP,Python][转]流式接口（Fluent interface）

// getting an item from a table
client.getItem('user-table')
.setHashKey('userId', 'userA')
.setRangeKey('column', '@')
.execute()
.then(function(data) {
// data.result: the resulting object
})

// example from http://schier.co/post/method-chaining-in-javascript
// define the class
var Kitten = function() {
this.name = 'Garfield';
this.color = 'brown';
this.gender = 'male';
};Kitten.prototype.setName = function(name) {
this.name = name;
return this;
};Kitten.prototype.setColor = function(color) {
this.color = color;
return this;
};Kitten.prototype.setGender = function(gender) {
this.gender = gender;
return this;
};Kitten.prototype.save = function() {
console.log(
'saving ' + this.name + ', the ' +
this.color + ' ' + this.gender + ' kitten...'
); // save to database here... return this;
};// use it
new Kitten()
.setName('Bob')
.setColor('black')
.setGender('male')
.save();

Author author = AUTHOR.as("author");
create.selectFrom(author)
.where(exists(selectOne()
.from(BOOK)
.where(BOOK.STATUS.eq(BOOK_STATUS.SOLD_OUT))
.and(BOOK.AUTHOR_ID.eq(author.ID))));

var translations = new Dictionary<string, string>
{
{"cat", "chat"},
{"dog", "chien"},
{"fish", "poisson"},
{"bird", "oiseau"}
};// Find translations for English words containing the letter "a",
// sorted by length and displayed in uppercase
IEnumerable<string> query = translations
.Where (t => t.Key.Contains("a"))
.OrderBy (t => t.Value.Length)
.Select (t => t.Value.ToUpper());// The same query constructed progressively:
var filtered = translations.Where (t => t.Key.Contains("a"));
var sorted = filtered.OrderBy (t => t.Value.Length);
var finalQuery = sorted.Select (t => t.Value.ToUpper());

// Defines the data context
class Context
{
public string FirstName { get; set; }
public string LastName { get; set; }
public string Sex { get; set; }
public string Address { get; set; }
}class Customer
{
private Context _context = new Context(); // Initializes the context // set the value for properties
public Customer FirstName(string firstName)
{
_context.FirstName = firstName;
return this;
} public Customer LastName(string lastName)
{
_context.LastName = lastName;
return this;
} public Customer Sex(string sex)
{
_context.Sex = sex;
return this;
} public Customer Address(string address)
{
_context.Address = address;
return this;
} // Prints the data to console
public void Print()
{
Console.WriteLine("First name: {0} \nLast name: {1} \nSex: {2} \nAddress: {3}", _context.FirstName, _context.LastName, _context.Sex, _context.Address);
}
}class Program
{
static void Main(string[] args)
{
// Object creation
Customer c1 = new Customer();
// Using the method chaining to assign & print data with a single line
c1.FirstName("vinod").LastName("srivastav").Sex("male").Address("bangalore").Print();
}
}

// Basic definition
class GlutApp {
private:
int w_, h_, x_, y_, argc_, display_mode_;
char **argv_;
char *title_;
public:
GlutApp(int argc, char** argv) {
argc_ = argc;
argv_ = argv;
}
void setDisplayMode(int mode) {
display_mode_ = mode;
}
int getDisplayMode() {
return display_mode_;
}
void setWindowSize(int w, int h) {
w_ = w;
h_ = h;
}
void setWindowPosition(int x, int y) {
x_ = x;
y_ = y;
}
void setTitle(const char *title) {
title_ = title;
}
void create(){;}
};
// Basic usage
int main(int argc, char **argv) {
GlutApp app(argc, argv);
app.setDisplayMode(GLUT_DOUBLE|GLUT_RGBA|GLUT_ALPHA|GLUT_DEPTH); // Set framebuffer params
app.setWindowSize(, ); // Set window params
app.setWindowPosition(, );
app.setTitle("My OpenGL/GLUT App");
app.create();
} // Fluent wrapper
class FluentGlutApp : private GlutApp {
public:
FluentGlutApp(int argc, char **argv) : GlutApp(argc, argv) {} // Inherit parent constructor
FluentGlutApp &withDoubleBuffer() {
setDisplayMode(getDisplayMode() | GLUT_DOUBLE);
return *this;
}
FluentGlutApp &withRGBA() {
setDisplayMode(getDisplayMode() | GLUT_RGBA);
return *this;
}
FluentGlutApp &withAlpha() {
setDisplayMode(getDisplayMode() | GLUT_ALPHA);
return *this;
}
FluentGlutApp &withDepth() {
setDisplayMode(getDisplayMode() | GLUT_DEPTH);
return *this;
}
FluentGlutApp &across(int w, int h) {
setWindowSize(w, h);
return *this;
}
FluentGlutApp &at(int x, int y) {
setWindowPosition(x, y);
return *this;
}
FluentGlutApp &named(const char *title) {
setTitle(title);
return *this;
}
// It doesn't make sense to chain after create(), so don't return *this
void create() {
GlutApp::create();
}
};
// Fluent usage
int main(int argc, char **argv) {
FluentGlutApp(argc, argv)
.withDoubleBuffer().withRGBA().withAlpha().withDepth()
.at(, ).across(, )
.named("My OpenGL/GLUT App")
.create();
}

# Add methods to String class
class String
def prefix(raw)
"#{raw} #{self}"
end
def suffix(raw)
"#{self} #{raw}"
end
def indent(raw)
raw = " " * raw if raw.kind_of? Fixnum
prefix(raw)
end
end# Fluent interface
message = "there"
puts message.prefix("hello")
.suffix("world")
.indent(8)

class Employee {
subset Salary of Real where * > ;
subset NonEmptyString of Str where * ~~ /\S/; # at least one non-space character has NonEmptyString $.name is rw;
has NonEmptyString $.surname is rw;
has Salary $.salary is rw; method gist {
return qq:to[END];
Name: $.name
Surname: $.surname
Salary: $.salary
END
}
}
my $employee = Employee.new();given $employee {
.name = 'Sally';
.surname = 'Ride';
.salary = ;
}say $employee;# Output:
# Name: Sally
# Surname: Ride
# Salary: 200

<?php
class Employee
{
public $name;
public $surName;
public $salary; public function setName($name)
{
$this->name = $name; return $this;
} public function setSurname($surname)
{
$this->surName = $surname; return $this;
} public function setSalary($salary)
{
$this->salary = $salary; return $this;
} public function __toString()
{
$employeeInfo = 'Name: ' . $this->name . PHP_EOL;
$employeeInfo .= 'Surname: ' . $this->surName . PHP_EOL;
$employeeInfo .= 'Salary: ' . $this->salary . PHP_EOL; return $employeeInfo;
}
}# Create a new instance of the Employee class, Tom Smith, with a salary of 100:
$employee = (new Employee())
->setName('Tom')
->setSurname('Smith')
->setSalary('100');# Display the value of the Employee instance:
echo $employee;# Display:
# Name: Tom
# Surname: Smith
# Salary: 100

class Poem(object):
def __init__(self, content):
self.content = content def indent(self, spaces):
self.content = " " * spaces + self.content
return self def suffix(self, content):
self.content = self.content + " - " + content
return self

>>> Poem("Road Not Travelled").indent(4).suffix("Robert Frost").content
' Road Not Travelled - Robert Frost'