ix.util
Class Fn

java.lang.Object
  ix.util.Fn

public final class Fn
extends java.lang.Object

Function utilities

See Also:

Collect, Strings, Util.makeInstance(Class), Util.makeInstance(Class, Object...)

Field Summary

static Predicate1	alwaysFalse A predicate that returns false for any object.
static Predicate1	alwaysTrue A predicate that returns true for any object.
static Function1	identity The identity function.

Method Summary

static Function1	accessor(java.lang.Class c, java.lang.String methodName) Returns a function that calls the 0-argument method specified by a class and method name.
static Function1	always(java.lang.Object value) Returns a function that always returns the same value.
static java.lang.Object	apply(java.lang.Object object, java.lang.reflect.Method meth, java.lang.Object[] arguments) Calls the indicated method.
static java.lang.Object	apply(java.lang.Object object, java.lang.String methodName, java.util.List arguments) Calls the indicated method.
static java.lang.Object	apply(java.lang.Object object, java.lang.String methodName, java.lang.Object[] arguments) Calls the indicated method.
static java.lang.Object	applyStatic(java.lang.Class c, java.lang.String methodName, java.util.List arguments) Calls the indicated static method.
static java.lang.Object	applyStatic(java.lang.Class c, java.lang.String methodName, java.lang.Object[] arguments) Calls the indicated static method.
static java.lang.reflect.Method	getMethod(java.lang.Class c, java.lang.String methodName, java.lang.Class[] argSig) Returns the specified method if it exists, else null.
static java.lang.reflect.Method	getMethod(java.lang.Object object, java.lang.String methodName, java.lang.Object[] arguments) Returns the specified method if it exists, else null.
static Predicate1	isInstanceOf(java.lang.Class c) Returns a predicate that test whether an object is an instance of the specified class.
static Predicate1	negate(Predicate1 p) Returns a predicate that returns false when the given predicate returns true, and true when it returns false.
static java.lang.Class	objectClass(java.lang.Class type) Maps primitive classes (TYPEs) to the corresponding object classes, and other classes to themselves.

Methods inherited from class java.lang.Object

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

Field Detail

alwaysTrue

public static final Predicate1 alwaysTrue

A predicate that returns true for any object.

alwaysFalse

public static final Predicate1 alwaysFalse

A predicate that returns false for any object.

identity

public static final Function1 identity

The identity function.

Method Detail

apply

public static java.lang.Object apply(java.lang.Object object,
                                     java.lang.String methodName,
                                     java.util.List arguments)

Calls the indicated method.

See Also:

getMethod(Class c, String methodName, Class[] argSig)

apply

public static java.lang.Object apply(java.lang.Object object,
                                     java.lang.String methodName,
                                     java.lang.Object[] arguments)

Calls the indicated method.

See Also:

getMethod(Class c, String methodName, Class[] argSig)

apply

public static java.lang.Object apply(java.lang.Object object,
                                     java.lang.reflect.Method meth,
                                     java.lang.Object[] arguments)

Calls the indicated method.

applyStatic

public static java.lang.Object applyStatic(java.lang.Class c,
                                           java.lang.String methodName,
                                           java.util.List arguments)

Calls the indicated static method.

See Also:

getMethod(Class c, String methodName, Class[] argSig)

applyStatic

public static java.lang.Object applyStatic(java.lang.Class c,
                                           java.lang.String methodName,
                                           java.lang.Object[] arguments)

Calls the indicated static method.

See Also:

getMethod(Class c, String methodName, Class[] argSig)

getMethod

public static java.lang.reflect.Method getMethod(java.lang.Object object,
                                                 java.lang.String methodName,
                                                 java.lang.Object[] arguments)

Returns the specified method if it exists, else null.

See Also:

getMethod(Class c, String methodName, Class[] argSig)

getMethod

public static java.lang.reflect.Method getMethod(java.lang.Class c,
                                                 java.lang.String methodName,
                                                 java.lang.Class[] argSig)

Returns the specified method if it exists, else null.

objectClass

public static java.lang.Class objectClass(java.lang.Class type)

Maps primitive classes (TYPEs) to the corresponding object classes, and other classes to themselves.

accessor

public static Function1 accessor(java.lang.Class c,
                                 java.lang.String methodName)

Returns a function that calls the 0-argument method specified by a class and method name.

always

public static Function1 always(java.lang.Object value)

Returns a function that always returns the same value.

negate

public static Predicate1 negate(Predicate1 p)

Returns a predicate that returns false when the given predicate returns true, and true when it returns false.

isInstanceOf

public static Predicate1 isInstanceOf(java.lang.Class c)

Returns a predicate that test whether an object is an instance of the specified class.