Package io.jans.service.custom.script.jit

Class JavaCodeGenerator

java.lang.Object

io.jans.service.custom.script.jit.JavaCodeGenerator

public class JavaCodeGenerator
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	JavaCodeGenerator.ClassBuilder	Helper class to generate classes
class	JavaCodeGenerator.MethodBuilder	Helper class to build methods
static class	JavaCodeGenerator.Scope	Simple scope for generation of shadowed local variables

Constructor Summary

Constructors

Constructor	Description
JavaCodeGenerator()	Creates a new JavaCodeGenerator that writes to the specified writer

Method Summary

Modifier and Type	Method	Description
JavaCodeGenerator	beginBlock()	Begins a new block
JavaCodeGenerator	boundedLoop(String indexVar, String lowerBound, String upperBound, Consumer<JavaCodeGenerator> body)	Simple bounded loop over an int index variable
void	comment(String s, Object... args)	Emmit a single-line comment.
JavaCodeGenerator	declare(String type, String name)	Declares an uninitialized local variable
JavaCodeGenerator	declare(String type, String name, String initialValue, Object... args)	Declares an initialized local variable
JavaCodeGenerator	declareExisting(String name)	Declare a pre-existing variable in the current scope.
static String	declareOnScope(JavaCodeGenerator.Scope scope, String type, String name, String initialValue)	Declares an initialized local variable at the beginning of the current scope.
JavaCodeGenerator	declareOnScope(String type, String name, String initialValue)	Declares an initialized local variable at the beginning of the current scope.
JavaCodeGenerator	endBlock()	Ends the current block
JavaCodeGenerator	forEach(String type, String elementVar, String collection, Consumer<JavaCodeGenerator> body)	Fore-each loop over an iterable
void	generate(Writer out)	Close all open scopes and generate the code
void	generateImport(Class<?> aClass)	Generates an import
JavaCodeGenerator.Scope	getScope()
JavaCodeGenerator	ifElse(String condition, Consumer<JavaCodeGenerator> accept, Consumer<JavaCodeGenerator> reject)	Generate an if-else statement
JavaCodeGenerator	ifElse(Consumer<JavaCodeGenerator> condition, Consumer<JavaCodeGenerator> accept, Consumer<JavaCodeGenerator> reject)	Generate an if-else statement
JavaCodeGenerator	ifThen(String condition, Consumer<JavaCodeGenerator> accept)	Generates a simple if-then statement
JavaCodeGenerator	ifThen(Consumer<JavaCodeGenerator> condition, Consumer<JavaCodeGenerator> accept)	Generates a simple if-then statement
JavaCodeGenerator	loop(Consumer<JavaCodeGenerator> body)	Unbounded loop
JavaCodeGenerator.MethodBuilder	packageMethod(String returnType, String name)	Create a private method
JavaCodeGenerator	parent()
JavaCodeGenerator	print(Object s)	Prints an object.
JavaCodeGenerator	printf(String format, Object... args)	Prints a formatted string using the specified format string and arguments.
JavaCodeGenerator	printfOnScope(String format, Object... args)	Prints the specified code at the beginning of the current scope.
JavaCodeGenerator	println()	Print a new line
JavaCodeGenerator	println(Object s)	Prints an Object and then terminates the line.
JavaCodeGenerator	printQuoted(String s)	Print the specified string so it is a valid java string literal.
JavaCodeGenerator.MethodBuilder	privateMethod(String returnType, String name)	Create a private method
JavaCodeGenerator.ClassBuilder	publicClass(String name)	Build a new public class
JavaCodeGenerator.MethodBuilder	publicMethod(String returnType, String name)	Create a public method
String	unique(String name)
String	variable(String name)

Methods inherited from class java.lang.Object

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

Constructor Details

JavaCodeGenerator

public JavaCodeGenerator()

Creates a new JavaCodeGenerator that writes to the specified writer

Method Details

unique

public String unique(String name)

Returns:

the name with a unique integer appended. The number is unique only for the current scope.

parent

public JavaCodeGenerator parent()

Returns:

this code generator's parent or null if top-level

generateImport

public void generateImport(Class<?> aClass)

Generates an import

declare

public JavaCodeGenerator declare(String type,
 String name)

Declares an uninitialized local variable

declareExisting

public JavaCodeGenerator declareExisting(String name)

Declare a pre-existing variable in the current scope. No code is emitted.

declare

public JavaCodeGenerator declare(String type,
 String name,
 String initialValue,
 Object... args)

Declares an initialized local variable

declareOnScope

public JavaCodeGenerator declareOnScope(String type,
 String name,
 String initialValue)

Declares an initialized local variable at the beginning of the current scope. Useful to declare temporary variables on complex expressions.

declareOnScope

public static String declareOnScope(JavaCodeGenerator.Scope scope,
 String type,
 String name,
 String initialValue)

Declares an initialized local variable at the beginning of the current scope. Useful to declare temporary variables on complex expressions.

Returns:

the resolved name of the variable

printfOnScope

public JavaCodeGenerator printfOnScope(String format,
 Object... args)

Prints the specified code at the beginning of the current scope. Useful to initialize temporary variables on complex expressions.

boundedLoop

public JavaCodeGenerator boundedLoop(String indexVar,
 String lowerBound,
 String upperBound,
 Consumer<JavaCodeGenerator> body)

Simple bounded loop over an int index variable

loop

public JavaCodeGenerator loop(Consumer<JavaCodeGenerator> body)

Unbounded loop

forEach

public JavaCodeGenerator forEach(String type,
 String elementVar,
 String collection,
 Consumer<JavaCodeGenerator> body)

Fore-each loop over an iterable

comment

public void comment(String s,
 Object... args)

Emmit a single-line comment. Supports new lines.

variable

public String variable(String name)

Returns:

the mangled name of the variable if it's shadowing another on an outer scope

printQuoted

public JavaCodeGenerator printQuoted(String s)

Print the specified string so it is a valid java string literal.

ifThen

public JavaCodeGenerator ifThen(String condition,
 Consumer<JavaCodeGenerator> accept)

Generates a simple if-then statement

ifThen

public JavaCodeGenerator ifThen(Consumer<JavaCodeGenerator> condition,
 Consumer<JavaCodeGenerator> accept)

Generates a simple if-then statement

ifElse

public JavaCodeGenerator ifElse(String condition,
 Consumer<JavaCodeGenerator> accept,
 Consumer<JavaCodeGenerator> reject)

Generate an if-else statement

getScope

public JavaCodeGenerator.Scope getScope()

Returns:

the current scope

ifElse

public JavaCodeGenerator ifElse(Consumer<JavaCodeGenerator> condition,
 Consumer<JavaCodeGenerator> accept,
 Consumer<JavaCodeGenerator> reject)

Generate an if-else statement

generate

public void generate(Writer out)

Close all open scopes and generate the code

beginBlock

public JavaCodeGenerator beginBlock()

Begins a new block

endBlock

public JavaCodeGenerator endBlock()

Ends the current block

println

public JavaCodeGenerator println()

Print a new line

println

public JavaCodeGenerator println(Object s)

Prints an Object and then terminates the line.

print

public JavaCodeGenerator print(Object s)

Prints an object.

printf

public JavaCodeGenerator printf(String format,
 Object... args)

Prints a formatted string using the specified format string and arguments.

publicClass

public JavaCodeGenerator.ClassBuilder publicClass(String name)

Build a new public class

packageMethod

public JavaCodeGenerator.MethodBuilder packageMethod(String returnType,
 String name)

Create a private method

privateMethod

public JavaCodeGenerator.MethodBuilder privateMethod(String returnType,
 String name)

Create a private method

publicMethod

public JavaCodeGenerator.MethodBuilder publicMethod(String returnType,
 String name)

Create a public method