ObjectUtils (Apache Juneau 7.2.0)

java.lang.Object
- org.apache.juneau.internal.ObjectUtils

public final class ObjectUtils
extends Object

Utility class for efficiently converting objects between types.

If the value isn't an instance of the specified type, then converts the value if possible.

The following conversions are valid:

Convert to type	Valid input value types	Notes
A class that is the normal type of a registered `PojoSwap`.	A value whose class matches the transformed type of that registered `PojoSwap`.
A class that is the transformed type of a registered `PojoSwap`.	A value whose class matches the normal type of that registered `PojoSwap`.
`Number` (e.g. `Integer`, `Short`, `Float`,...) `Number.TYPE` (e.g. `Integer.TYPE`, `Short.TYPE`, `Float.TYPE`,...)	`Number`, `String`, null	For primitive `TYPES`, null returns the JVM default value for that type.
`Map` (e.g. `Map`, `HashMap`, `TreeMap`, `ObjectMap`)	`Map`	If `Map` is not constructible, a `ObjectMap` is created.
`Collection` (e.g. `List`, `LinkedList`, `HashSet`, `ObjectList`)	`Collection<Object>` `Object[]`	If `Collection` is not constructible, a `ObjectList` is created.
`X[]` (array of any type X)	`List<X>`
`X[][]` (multi-dimensional arrays)	`List<List<X>>` `List<X[]>` `List[]<X>`
`Enum`	`String`
Bean	`Map`
`String`	Anything	Arrays are converted to JSON arrays
Anything with one of the following methods: `public static T fromString(String)` `public static T valueOf(String)` `public T(String)`	`String`

Constructor Summary

Constructors
Constructor and Description

ObjectUtils()

Constructors
Constructor and Description
`ObjectUtils()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static <T> T`	`castOrNull(Object o, Class<T> c)` If the specified object is an instance of the specified class, casts it to that type.
`static boolean`	`equals(Object o1, Object o2)` Returns true if the specified objects are equal.
`static <T> T`	`firstNonEmpty(T... o)` Returns the first non-empty value in the list of objects.
`static <T> T`	`firstNonNull(T... t)` Returns the first non-null value in the specified array
`static int`	`firstNonZero(int... ints)` Returns the first non-zero value in the list of ints.
`static Enum<?>[]`	`getEnumConstants(Class<?> c)` Returns the enum names for the specified enum class.
`static boolean`	`isEmpty(Object o)` Returns true if the specified object is empty.
`static Boolean`	`toBoolean(Object o)` Converts an object to a Boolean.
`static Integer`	`toInteger(Object o)` Converts an object to an Integer.
`static <T> T`	`toMemberType(Object outer, Object value, Class<T> type)` Converts the specified object to the specified type.
`static Number`	`toNumber(Object o)` Converts an object to a Number.
`static <T> T`	`toType(Object value, Class<T> type)` Converts the specified object to the specified type.
`static <T> T`	`toType(Object value, Class<T> type, Type... args)` Converts the specified object to the specified type.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ObjectUtils
```
public ObjectUtils()
```
- Method Detail
  - toType
```
public static <T> T toType(Object value,
                           Class<T> type)
```
    Converts the specified object to the specified type.
    
    Type Parameters:
    
    T - The class type to convert the value to.
    
    Parameters:
    
    value - The value to convert.
    
    type - The class type to convert the value to.
    
    Returns:
    
    The converted value.
    
    Throws:
    
    InvalidDataConversionException - If the specified value cannot be converted to the specified type.
  - toType
```
public static <T> T toType(Object value,
                           Class<T> type,
                           Type... args)
```
    Converts the specified object to the specified type.
    
    Type Parameters:
    
    T - The class type to convert the value to.
    
    Parameters:
    
    value - The value to convert.
    
    type - The class type to convert the value to.
    
    args - The type arguments.
    
    Returns:
    
    The converted value.
    
    Throws:
    
    InvalidDataConversionException - If the specified value cannot be converted to the specified type.
  - toMemberType
```
public static <T> T toMemberType(Object outer,
                                 Object value,
                                 Class<T> type)
```
    Converts the specified object to the specified type.
    
    Type Parameters:
    
    T - The class type to convert the value to.
    
    Parameters:
    
    outer - If class is a member class, this is the instance of the containing class. Should be null if not a member class.
    
    value - The value to convert.
    
    type - The class type to convert the value to.
    
    Returns:
    
    The converted value.
    
    Throws:
    
    InvalidDataConversionException - If the specified value cannot be converted to the specified type.
  - equals
```
public static boolean equals(Object o1,
                             Object o2)
```
    Returns true if the specified objects are equal.
    Gracefully handles nulls.
    
    Parameters:
    
    o1 - Object #1
    
    o2 - Object #2
    
    Returns:
    
    true if the objects are equal or both null.
  - isEmpty
```
public static boolean isEmpty(Object o)
```
    Returns true if the specified object is empty.
    Return true if the value is any of the following:
    - null
    - An empty Collection
    - An empty Map
    - An empty array
    - An empty CharSequence
    - An empty String when serialized to a string using Object.toString().
    Parameters:
    
    o - The object to test.
    
    Returns:
    
    true if the specified object is empty.
  - firstNonNull
```
@SafeVarargs
public static <T> T firstNonNull(T... t)
```
    Returns the first non-null value in the specified array
    
    Parameters:
    
    t -
    
    Returns:
    
    The first non-null value, or null if the array is null or empty or contains only null values.
  - toBoolean
```
public static Boolean toBoolean(Object o)
```
    Converts an object to a Boolean.
    
    Parameters:
    
    o - The object to convert.
    
    Returns:
    
    The converted object.
  - toInteger
```
public static Integer toInteger(Object o)
```
    Converts an object to an Integer.
    
    Parameters:
    
    o - The object to convert.
    
    Returns:
    
    The converted object.
  - toNumber
```
public static Number toNumber(Object o)
```
    Converts an object to a Number.
    
    Parameters:
    
    o - The object to convert.
    
    Returns:
    
    The converted object.
  - getEnumConstants
```
public static Enum<?>[] getEnumConstants(Class<?> c)
```
    Returns the enum names for the specified enum class.
    
    Parameters:
    
    c - The enum class.
    
    Returns:
    
    A modifiable list of all names for that class.
  - castOrNull
```
public static <T> T castOrNull(Object o,
                               Class<T> c)
```
    If the specified object is an instance of the specified class, casts it to that type.
    
    Parameters:
    
    o - The object to cast.
    
    c - The class to cast to.
    
    Returns:
    
    The cast object, or null if the object wasn't an instance of the specified class.
  - firstNonZero
```
public static int firstNonZero(int... ints)
```
    Returns the first non-zero value in the list of ints.
    
    Parameters:
    
    ints - The ints to check.
    
    Returns:
    
    The first non-zero value, or 0 if they were all zero.
  - firstNonEmpty
```
@SafeVarargs
public static <T> T firstNonEmpty(T... o)
```
    Returns the first non-empty value in the list of objects.
    
    Parameters:
    
    o - The objects to check.
    
    Returns:
    
    The first object whose call to isEmpty(Object) returns false, otherwise null.

Class ObjectUtils

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ObjectUtils

Method Detail

toType

toType

toMemberType

equals

isEmpty

firstNonNull

toBoolean

toInteger

toNumber

getEnumConstants

castOrNull

firstNonZero

firstNonEmpty