edu.stanford.nlp.util

Class MetaClass

java.lang.Object

edu.stanford.nlp.util.MetaClass

public class MetaClass
extends java.lang.Object

A meta class using Java's reflection library. Can be used to create a single instance, or a factory, where each Class from the factory share their constructor parameters.

Author:

Gabor Angeli

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MetaClass.ClassCreationException
static class	MetaClass.ClassFactory<T>
static class	MetaClass.ConstructorNotFoundException

Constructor Summary

Constructors

Constructor and Description
MetaClass(java.lang.Class<?> classname) Creates a new MetaClass producing objects of the given type
MetaClass(java.lang.String classname) Creates a new MetaClass producing objects of the given type

Method Summary

Modifier and Type	Method and Description
static <E> E	cast(java.lang.String value, java.lang.reflect.Type type) Cast a String representation of an object into that object.
static <E> E	castWithoutKnowingType(java.lang.String value)
boolean	checkConstructor(java.lang.Object... params)
static MetaClass	create(java.lang.Class<?> clazz) Creates a new MetaClass (helper method)
static MetaClass	create(java.lang.String classname) Creates a new MetaClass (helper method)
<E> MetaClass.ClassFactory<E>	createFactory(java.lang.Class<?>... classes) Creates a factory for producing instances of this class from a constructor taking the given types as arguments
<E> MetaClass.ClassFactory<E>	createFactory(java.lang.Object... objects) Creates a factory for producing instances of this class from a constructor taking objects of the types given
<E> MetaClass.ClassFactory<E>	createFactory(java.lang.String... classes) Creates a factory for producing instances of this class from a constructor taking the given types as arguments
<E,F extends E> F	createInstance(java.lang.Class<E> type, java.lang.Object... params) Creates an instance of the class, forcing a cast to a certain type and given an array of objects as constructor parameters NOTE: the resulting instance will [unlike java] invoke the most narrow constructor rather than the one which matches the signature passed to this function
<E> E	createInstance(java.lang.Object... objects) Create an instance of the class, inferring the type automatically, and given an array of objects as constructor parameters NOTE: the resulting instance will [unlike java] invoke the most narrow constructor rather than the one which matches the signature passed to this function
boolean	equals(java.lang.Object o)
int	hashCode()
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

MetaClass

public MetaClass(java.lang.String classname)

Creates a new MetaClass producing objects of the given type

Parameters:

classname - The full classname of the objects to create

MetaClass

public MetaClass(java.lang.Class<?> classname)

Creates a new MetaClass producing objects of the given type

Parameters:

classname - The class to create

Method Detail

createFactory

public <E> MetaClass.ClassFactory<E> createFactory(java.lang.Class<?>... classes)

Creates a factory for producing instances of this class from a constructor taking the given types as arguments

Type Parameters:

E - The type of the objects to be produced

Parameters:

classes - The types used in the constructor

Returns:

A ClassFactory of the given type

createFactory

public <E> MetaClass.ClassFactory<E> createFactory(java.lang.String... classes)

Creates a factory for producing instances of this class from a constructor taking the given types as arguments

Type Parameters:

E - The type of the objects to be produced

Parameters:

classes - The types used in the constructor

Returns:

A ClassFactory of the given type

createFactory

public <E> MetaClass.ClassFactory<E> createFactory(java.lang.Object... objects)

Creates a factory for producing instances of this class from a constructor taking objects of the types given

Type Parameters:

E - The type of the objects to be produced

Parameters:

objects - Instances of the types used in the constructor

Returns:

A ClassFactory of the given type

createInstance

public <E> E createInstance(java.lang.Object... objects)

Create an instance of the class, inferring the type automatically, and given an array of objects as constructor parameters NOTE: the resulting instance will [unlike java] invoke the most narrow constructor rather than the one which matches the signature passed to this function

Type Parameters:

E - The type of the object returned

Parameters:

objects - The arguments to the constructor of the class

Returns:

An instance of the class

createInstance

public <E,F extends E> F createInstance(java.lang.Class<E> type,
                                        java.lang.Object... params)

Creates an instance of the class, forcing a cast to a certain type and given an array of objects as constructor parameters NOTE: the resulting instance will [unlike java] invoke the most narrow constructor rather than the one which matches the signature passed to this function

Type Parameters:

E - The type of the object returned

Parameters:

type - The class of the object returned

params - The arguments to the constructor of the class

Returns:

An instance of the class

checkConstructor

public boolean checkConstructor(java.lang.Object... params)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

create

public static MetaClass create(java.lang.String classname)

Creates a new MetaClass (helper method)

Parameters:

classname - The name of the class to create

Returns:

A new MetaClass object of the given class

create

public static MetaClass create(java.lang.Class<?> clazz)

Creates a new MetaClass (helper method)

Parameters:

clazz - The class to create

Returns:

A new MetaClass object of the given class

cast

public static <E> E cast(java.lang.String value,
                         java.lang.reflect.Type type)

Cast a String representation of an object into that object. E.g. "5.4" will be cast to a Double; "[1,2,3]" will be cast to an Integer[]. NOTE: Date parses from a Long

Type Parameters:

E - The type of the object returned (same as type)

Parameters:

value - The string representation of the object

type - The type (usually class) to be returned (same as E)

Returns:

An object corresponding to the String value passed

castWithoutKnowingType

public static <E> E castWithoutKnowingType(java.lang.String value)