net.imadz.util

Class MetaDataUtil

java.lang.Object

net.imadz.util.MetaDataUtil

public abstract class MetaDataUtil
extends Object

Static utility functions used internally by the met-data infrastructure.

Field Summary

Fields

Modifier and Type	Field and Description
static Charset	UTF8

Constructor Summary

Constructors

Constructor and Description
MetaDataUtil()

Method Summary

Modifier and Type	Method and Description
static <T,S extends Collection<T>> S	addAll(S collection, T... values) Add all elements to the collection
static <O> O	coalesce(O... values) Returns the first non-null value in the set
static boolean	equals(Object left, Object right) Null-safe equals
static <T> T	findFirstValue(Class<T> type, Collection<?> values)
static <T> T	first(List<T> list, int oridinal) Returns the first ordinal element in the list.
static <T> T	firstValue(Class<T> type, Collection<?> values)
static String	getAccessorName(Method method, String... prefixes)
static int	hashCode(int mul, Object obj)
static <T> T	last(List<T> list, int ordinal) Returns the last ordinal element in the last
static <O> O	max(Comparator<O> comparator, O... values)
static <O extends Comparable<O>> O	max(O... values)
static <O> O	min(Comparator<O> comparator, O... values)
static <O extends Comparable<O>> O	min(O... values)
static String[]	nullSafeSplit(String str, String splitCriteria)
static <T> T	singleValue(Class<T> type, Collection<?> values)
static <T> T	singleValue(Class<T> type, List<?> values)
static String	toClassAndValue(Object value)
static String	toHexString(byte[] bytes)
static String	toHexString(int[] sets)
static String	trimToNull(String str) Null-safe trim that will convert a null string to null.

Methods inherited from class java.lang.Object

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

Field Detail

UTF8

public static final Charset UTF8

Constructor Detail

MetaDataUtil

public MetaDataUtil()

Method Detail

equals

public static final boolean equals(Object left,
                                   Object right)

Null-safe equals

Parameters:

left -

right -

Returns:

true if left value and right values equate

hashCode

public static final int hashCode(int mul,
                                 Object obj)

toHexString

public static final String toHexString(byte[] bytes)

toHexString

public static final String toHexString(int[] sets)

nullSafeSplit

public static final String[] nullSafeSplit(String str,
                                           String splitCriteria)

trimToNull

public static final String trimToNull(String str)

Null-safe trim that will convert a null string to null. TODO This method already exists elsewhere, I just can't find it

Parameters:

str - String to trim

Returns:

Trimmed string, or null if the string is null or a null string

toClassAndValue

public static final String toClassAndValue(Object value)

Parameters:

value - Object to convert to a string

Returns:

Passed object + (passed object type)

min

public static final <O extends Comparable<O>> O min(O... values)

max

public static final <O extends Comparable<O>> O max(O... values)

min

public static final <O> O min(Comparator<O> comparator,
                              O... values)

max

public static final <O> O max(Comparator<O> comparator,
                              O... values)

singleValue

public static final <T> T singleValue(Class<T> type,
                                      List<?> values)

Type Parameters:

T -

Parameters:

type -

values -

Returns:

singleValue

public static final <T> T singleValue(Class<T> type,
                                      Collection<?> values)

Type Parameters:

T -

Parameters:

type -

values -

Returns:

firstValue

public static final <T> T firstValue(Class<T> type,
                                     Collection<?> values)

Type Parameters:

T -

Parameters:

type -

values -

Returns:

findFirstValue

public static final <T> T findFirstValue(Class<T> type,
                                         Collection<?> values)

Type Parameters:

T -

Parameters:

type -

values -

Returns:

coalesce

public static final <O> O coalesce(O... values)

Returns the first non-null value in the set

addAll

public static final <T,S extends Collection<T>> S addAll(S collection,
                                                         T... values)

Add all elements to the collection

last

public static final <T> T last(List<T> list,
                               int ordinal)

Returns the last ordinal element in the last

Parameters:

list -

ordinal - 0 for the last element in the list, 1 for second-to-last, and so on

Returns:

Element from list or null if the element does not exist

first

public static final <T> T first(List<T> list,
                                int oridinal)

Returns the first ordinal element in the list.

Parameters:

list -

oridinal - 0 for the first element in list, 1 for second, and so on

Returns:

Element from list or null if the element does not exist

getAccessorName

public static final String getAccessorName(Method method,
                                           String... prefixes)