NullObject (Groovy 4.0.13)

org.codehaus.groovy.runtime.NullObject

public class NullObject
extends GroovyObjectSupport

Methods Summary

Methods
Type Params	Return Type	Name and description
	`public boolean`	`asBoolean()` A null object always coerces to false.
	`public Object`	`asType(Class c)` Type conversion method for null.
	`public Object`	`clone()` Since this is implemented as a singleton, we should avoid the use of the clone method
	`public boolean`	`equals(Object to)` null is only equal to null
	`public static NullObject`	`getNullObject()` get the NullObject reference
	`public Object`	`getProperty(String property)` Tries to get a property on null, which will always fail
	`public int`	`hashCode()`
	`public Object`	`invokeMethod(String name, Object args)` Tries to invoke a method on null, which will always fail
	`public boolean`	`is(Object other)` The method "is" is used to test for equal references.
	`public Iterator`	`iterator()` iterator() method to be able to iterate on null.
	`public Object`	`plus(String s)` Allows to add a String to null.
	`public Object`	`plus(Object o)` Fallback for null+null.
	`public void`	`setProperty(String property, Object newValue)` Tries to set a property on null, which will always fail
	`public String`	`toString()`
`<T>`	`public T`	`with(Closure<T> closure)` Allows the closure to be called for NullObject

Inherited Methods Summary

Inherited Methods
Methods inherited from class	Name
`class GroovyObjectSupport`	`getMetaClass, setMetaClass`

- Method Detail
  - public boolean asBoolean()
    
    A null object always coerces to false.
    Returns:
    false
  - public Object asType(Class c)
    
    Type conversion method for null.
    Parameters:
    c - - the class to convert to
    Returns:
    always null
  - @Override
    public Object clone()
    
    Since this is implemented as a singleton, we should avoid the use of the clone method
  - @Override
    public boolean equals(Object to)
    
    null is only equal to null
    Parameters:
    to - - the reference object with which to compare
    Returns:
    - true if this object is the same as the to argument
  - public static NullObject getNullObject()
    
    get the NullObject reference
    Returns:
    the null object
  - @Override
    public Object getProperty(String property)
    
    Tries to get a property on null, which will always fail
    Parameters:
    property - - the property to get
    Returns:
    a NPE
  - @Override
    public int hashCode()
  - @Override
    public Object invokeMethod(String name, Object args)
    
    Tries to invoke a method on null, which will always fail
    Parameters:
    name - the name of the method to invoke
    args - - arguments to the method
    Returns:
    a NPE
  - public boolean is(Object other)
    
    The method "is" is used to test for equal references. This method will return true only if the given parameter is null
    Parameters:
    other - - the object to test
    Returns:
    true if other is null
  - public Iterator iterator()
    
    iterator() method to be able to iterate on null. Note: this part is from Invoker
    Returns:
    an iterator for an empty list
  - public Object plus(String s)
    
    Allows to add a String to null. The result is concatenated String of the result of calling toString() on this object and the String in the parameter.
    Parameters:
    s - - the String to concatenate
    Returns:
    the concatenated string
  - public Object plus(Object o)
    
    Fallback for null+null. The result is always a NPE. The plus(String) version will catch the case of adding a non-null String to null.
    Parameters:
    o - - the Object
    Returns:
    nothing
  - @Override
    public void setProperty(String property, Object newValue)
    
    Tries to set a property on null, which will always fail
    Parameters:
    property - - the property to set
    newValue - - the new value of the property
  - @Override
    public String toString()
  - <T> public T with(Closure<T> closure)
    
    Allows the closure to be called for NullObject
    Parameters:
    closure - the closure to call on the object
    Returns:
    result of calling the closure

Summary:
Method

| Detail:
Method

[Java] Class NullObject

Methods Summary

Inherited Methods Summary

Method Detail

public boolean asBoolean()

public Object asType(Class c)

@Override
public Object clone()

@Override
public boolean equals(Object to)

public static NullObject getNullObject()

@Override
public Object getProperty(String property)

@Override
public int hashCode()

@Override
public Object invokeMethod(String name, Object args)

public boolean is(Object other)

public Iterator iterator()

public Object plus(String s)

public Object plus(Object o)

@Override
public void setProperty(String property, Object newValue)

@Override
public String toString()

<T> public T with(Closure<T> closure)

[Java] Class NullObject

Methods Summary

Inherited Methods Summary

Method Detail

public boolean asBoolean()

public Object asType(Class c)

@Overridepublic Object clone()

@Overridepublic boolean equals(Object to)

public static NullObject getNullObject()

@Overridepublic Object getProperty(String property)

@Overridepublic int hashCode()

@Overridepublic Object invokeMethod(String name, Object args)

public boolean is(Object other)

public Iterator iterator()

public Object plus(String s)

public Object plus(Object o)

@Overridepublic void setProperty(String property, Object newValue)

@Overridepublic String toString()

<T> public T with(Closure<T> closure)

@Override
public Object clone()

@Override
public boolean equals(Object to)

@Override
public Object getProperty(String property)

@Override
public int hashCode()

@Override
public Object invokeMethod(String name, Object args)

@Override
public void setProperty(String property, Object newValue)

@Override
public String toString()