org.batoo.common.util

Class ObjectUtils

java.lang.Object

org.batoo.common.util.ObjectUtils

public abstract class ObjectUtils
extends Object

Miscellaneous object utility methods.

Mainly for internal use within the framework; consider Jakarta's Commons Lang for a more comprehensive suite of object utilities.

The original code is based on org.springframework.util.ObjectUtils

Since:

2.0.1

Author:

hceylan

See Also:

ObjectUtils

Constructor Summary

Constructors

Constructor and Description
ObjectUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static <A,O extends A> A[]	addObjectToArray(A[] array, O obj) Append the given object to the given array, returning a new array consisting of the input array contents plus the given object.
static <E extends Enum<?>> E	caseInsensitiveValueOf(E[] enumValues, String constant) Case insensitive alternative to Enum.valueOf(Class, String).
static boolean	containsConstant(Enum<?>[] enumValues, String constant) Check whether the given array of enum constants contains a constant with the given name, ignoring case when determining a match.
static boolean	containsConstant(Enum<?>[] enumValues, String constant, boolean caseSensitive) Check whether the given array of enum constants contains a constant with the given name.
static boolean	containsElement(Object[] array, Object element) Check whether the given array contains the given element.
static String	getDisplayString(Object obj) Return a content-based String representation if obj is not null; otherwise returns an empty String.
static String	getIdentityHexString(Object obj) Return a hex String form of an object's identity hash code.
static int	hashCode(boolean bool) Return the same value as Boolean.hashCode().
static int	hashCode(double dbl) Return the same value as Double.hashCode().
static int	hashCode(float flt) Return the same value as Float.hashCode().
static int	hashCode(long lng) Return the same value as Long.hashCode().
static String	identityToString(Object obj) Return a String representation of an object's overall identity.
static boolean	isArray(Object obj) Determine whether the given object is an array: either an Object array or a primitive array.
static boolean	isCheckedException(Throwable ex) Return whether the given throwable is a checked exception: that is, neither a RuntimeException nor an Error.
static boolean	isCompatibleWithThrowsClause(Throwable ex, Class<?>[] declaredExceptions) Check whether the given exception is compatible with the exceptions declared in a throws clause.
static boolean	isEmpty(Object[] array) Determine whether the given array is empty: i.e.
static String	nullSafeClassName(Object obj) Determine the class name for the given object.
static boolean	nullSafeEquals(Object o1, Object o2) Determine if the given objects are equal, returning true if both are null or false if only one is null.
static int	nullSafeHashCode(boolean[] array) Return a hash code based on the contents of the specified array.
static int	nullSafeHashCode(byte[] array) Return a hash code based on the contents of the specified array.
static int	nullSafeHashCode(char[] array) Return a hash code based on the contents of the specified array.
static int	nullSafeHashCode(double[] array) Return a hash code based on the contents of the specified array.
static int	nullSafeHashCode(float[] array) Return a hash code based on the contents of the specified array.
static int	nullSafeHashCode(int[] array) Return a hash code based on the contents of the specified array.
static int	nullSafeHashCode(long[] array) Return a hash code based on the contents of the specified array.
static int	nullSafeHashCode(Object obj) Return as hash code for the given object; typically the value of Object.hashCode().
static int	nullSafeHashCode(Object[] array) Return a hash code based on the contents of the specified array.
static int	nullSafeHashCode(short[] array) Return a hash code based on the contents of the specified array.
static String	nullSafeToString(boolean[] array) Return a String representation of the contents of the specified array.
static String	nullSafeToString(byte[] array) Return a String representation of the contents of the specified array.
static String	nullSafeToString(char[] array) Return a String representation of the contents of the specified array.
static String	nullSafeToString(double[] array) Return a String representation of the contents of the specified array.
static String	nullSafeToString(float[] array) Return a String representation of the contents of the specified array.
static String	nullSafeToString(int[] array) Return a String representation of the contents of the specified array.
static String	nullSafeToString(long[] array) Return a String representation of the contents of the specified array.
static String	nullSafeToString(Object obj) Return a String representation of the specified Object.
static String	nullSafeToString(Object[] array) Return a String representation of the contents of the specified array.
static String	nullSafeToString(short[] array) Return a String representation of the contents of the specified array.
static Object[]	toObjectArray(Object source) Convert the given array (which may be a primitive array) to an object array (if necessary of primitive wrapper objects).

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

addObjectToArray

public static <A,O extends A> A[] addObjectToArray(A[] array,
                                   O obj)

Append the given object to the given array, returning a new array consisting of the input array contents plus the given object.

Type Parameters:

A - the type of the array

O - the type of the object

Parameters:

array - the array to append to (can be null)

obj - the object to append

Returns:

the new array (of the same component type; never null)

caseInsensitiveValueOf

public static <E extends Enum<?>> E caseInsensitiveValueOf(E[] enumValues,
                                           String constant)

Case insensitive alternative to Enum.valueOf(Class, String).

Type Parameters:

E - the concrete Enum type

Parameters:

enumValues - the array of all Enum constants in question, usually per Enum.values()

constant - the constant to get the enum value of

Returns:

the type of the array

Throws:

IllegalArgumentException - if the given constant is not found in the given array of enum values. Use containsConstant(Enum[], String) as a guard to avoid this exception.

containsConstant

public static boolean containsConstant(Enum<?>[] enumValues,
                       String constant)

Check whether the given array of enum constants contains a constant with the given name, ignoring case when determining a match.

Parameters:

enumValues - the enum values to check, typically the product of a call to MyEnum.values()

constant - the constant name to find (must not be null or empty string)

Returns:

whether the constant has been found in the given array

containsConstant

public static boolean containsConstant(Enum<?>[] enumValues,
                       String constant,
                       boolean caseSensitive)

Check whether the given array of enum constants contains a constant with the given name.

Parameters:

enumValues - the enum values to check, typically the product of a call to MyEnum.values()

constant - the constant name to find (must not be null or empty string)

caseSensitive - whether case is significant in determining a match

Returns:

whether the constant has been found in the given array

containsElement

public static boolean containsElement(Object[] array,
                      Object element)

Check whether the given array contains the given element.

Parameters:

array - the array to check (may be null, in which case the return value will always be false)

element - the element to check for

Returns:

whether the element has been found in the given array

getDisplayString

public static String getDisplayString(Object obj)

Return a content-based String representation if obj is not null; otherwise returns an empty String.

Differs from nullSafeToString(Object) in that it returns an empty String rather than "null" for a null value.

Parameters:

obj - the object to build a display String for

Returns:

a display String representation of obj

See Also:

nullSafeToString(Object)

getIdentityHexString

public static String getIdentityHexString(Object obj)

Return a hex String form of an object's identity hash code.

Parameters:

obj - the object

Returns:

the object's identity code in hex notation

hashCode

public static int hashCode(boolean bool)

Return the same value as Boolean.hashCode().

Parameters:

bool - the boolean value

Returns:

the hash code

See Also:

Boolean.hashCode()

hashCode

public static int hashCode(double dbl)

Return the same value as Double.hashCode().

Parameters:

dbl - the double value

Returns:

the hash code

See Also:

Double.hashCode()

hashCode

public static int hashCode(float flt)

Return the same value as Float.hashCode().

Parameters:

flt - the float value

Returns:

the hash code

See Also:

Float.hashCode()

hashCode

public static int hashCode(long lng)

Return the same value as Long.hashCode().

Parameters:

lng - the long value

Returns:

the hash code

See Also:

Long.hashCode()

identityToString

public static String identityToString(Object obj)

Return a String representation of an object's overall identity.

Parameters:

obj - the object (may be null)

Returns:

the object's identity as String representation, or an empty String if the object was null

isArray

public static boolean isArray(Object obj)

Determine whether the given object is an array: either an Object array or a primitive array.

Parameters:

obj - the object to check

Returns:

true of object is an array false otherwise

isCheckedException

public static boolean isCheckedException(Throwable ex)

Return whether the given throwable is a checked exception: that is, neither a RuntimeException nor an Error.

Parameters:

ex - the throwable to check

Returns:

whether the throwable is a checked exception

See Also:

Exception, RuntimeException, Error

isCompatibleWithThrowsClause

public static boolean isCompatibleWithThrowsClause(Throwable ex,
                                   Class<?>[] declaredExceptions)

Check whether the given exception is compatible with the exceptions declared in a throws clause.

Parameters:

ex - the exception to checked

declaredExceptions - the exceptions declared in the throws clause

Returns:

whether the given exception is compatible

isEmpty

public static boolean isEmpty(Object[] array)

Determine whether the given array is empty: i.e. null or of zero length.

Parameters:

array - the array to check

Returns:

true if the array is empty, false otherwise

nullSafeClassName

public static String nullSafeClassName(Object obj)

Determine the class name for the given object.

Returns "null" if obj is null.

Parameters:

obj - the object to introspect (may be null)

Returns:

the corresponding class name

nullSafeEquals

public static boolean nullSafeEquals(Object o1,
                     Object o2)

Determine if the given objects are equal, returning true if both are null or false if only one is null.

Compares arrays with Arrays.equals, performing an equality check based on the array elements rather than the array reference.

Parameters:

o1 - first Object to compare

o2 - second Object to compare

Returns:

whether the given objects are equal

See Also:

Arrays.equals(long[], long[])

nullSafeHashCode

public static int nullSafeHashCode(boolean[] array)

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Parameters:

array - the array value

Returns:

the hash code

nullSafeHashCode

public static int nullSafeHashCode(byte[] array)

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Parameters:

array - the array value

Returns:

the hash code

nullSafeHashCode

public static int nullSafeHashCode(char[] array)

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Parameters:

array - the array value

Returns:

the hash code

nullSafeHashCode

public static int nullSafeHashCode(double[] array)

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Parameters:

array - the array value

Returns:

the hash code

nullSafeHashCode

public static int nullSafeHashCode(float[] array)

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Parameters:

array - the array value

Returns:

the hash code

nullSafeHashCode

public static int nullSafeHashCode(int[] array)

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Parameters:

array - the array value

Returns:

the hash code

nullSafeHashCode

public static int nullSafeHashCode(long[] array)

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Parameters:

array - the array value

Returns:

the hash code

nullSafeHashCode

public static int nullSafeHashCode(Object obj)

Return as hash code for the given object; typically the value of Object.hashCode(). If the object is an array, this method will delegate to any of the nullSafeHashCode methods for arrays in this class. If the object is null, this method returns 0.

Parameters:

obj - the object value

Returns:

the hash code

See Also:

nullSafeHashCode(Object[]), nullSafeHashCode(boolean[]), nullSafeHashCode(byte[]), nullSafeHashCode(char[]), nullSafeHashCode(double[]), nullSafeHashCode(float[]), nullSafeHashCode(int[]), nullSafeHashCode(long[]), nullSafeHashCode(short[])

nullSafeHashCode

public static int nullSafeHashCode(Object[] array)

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Parameters:

array - the array value

Returns:

the hash code

nullSafeHashCode

public static int nullSafeHashCode(short[] array)

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Parameters:

array - the array value

Returns:

the hash code

nullSafeToString

public static String nullSafeToString(boolean[] array)

Return a String representation of the contents of the specified array.

The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns "null" if array is null.

Parameters:

array - the array to build a String representation for

Returns:

a String representation of array

nullSafeToString

public static String nullSafeToString(byte[] array)

Return a String representation of the contents of the specified array.

The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns "null" if array is null.

Parameters:

array - the array to build a String representation for

Returns:

a String representation of array

nullSafeToString

public static String nullSafeToString(char[] array)

Return a String representation of the contents of the specified array.

The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns "null" if array is null.

Parameters:

array - the array to build a String representation for

Returns:

a String representation of array

nullSafeToString

public static String nullSafeToString(double[] array)

Return a String representation of the contents of the specified array.

The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns "null" if array is null.

Parameters:

array - the array to build a String representation for

Returns:

a String representation of array

nullSafeToString

public static String nullSafeToString(float[] array)

Return a String representation of the contents of the specified array.

The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns "null" if array is null.

Parameters:

array - the array to build a String representation for

Returns:

a String representation of array

nullSafeToString

public static String nullSafeToString(int[] array)

Return a String representation of the contents of the specified array.

The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns "null" if array is null.

Parameters:

array - the array to build a String representation for

Returns:

a String representation of array

nullSafeToString

public static String nullSafeToString(long[] array)

Return a String representation of the contents of the specified array.

The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns "null" if array is null.

Parameters:

array - the array to build a String representation for

Returns:

a String representation of array

nullSafeToString

public static String nullSafeToString(Object obj)

Return a String representation of the specified Object.

Builds a String representation of the contents in case of an array. Returns "null" if obj is null.

Parameters:

obj - the object to build a String representation for

Returns:

a String representation of obj

nullSafeToString

public static String nullSafeToString(Object[] array)

Return a String representation of the contents of the specified array.

The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns "null" if array is null.

Parameters:

array - the array to build a String representation for

Returns:

a String representation of array

nullSafeToString

public static String nullSafeToString(short[] array)

Return a String representation of the contents of the specified array.

The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns "null" if array is null.

Parameters:

array - the array to build a String representation for

Returns:

a String representation of array

toObjectArray

public static Object[] toObjectArray(Object source)

Convert the given array (which may be a primitive array) to an object array (if necessary of primitive wrapper objects).

A null source value will be converted to an empty Object array.

Parameters:

source - the (potentially primitive) array

Returns:

the corresponding object array (never null)

Throws:

IllegalArgumentException - if the parameter is not an array