net.ladenthin.javacommons

Class StringCollectionToPrimitiveArray

java.lang.Object

net.ladenthin.javacommons.StringCollectionToPrimitiveArray

public class StringCollectionToPrimitiveArray
extends Object

Convert a string collection to an array containing string or primitive data types. All methods are thread safe.

Author:

Bernard Ladenthin bernard.ladenthin@gmail.com

Field Summary

Fields

Modifier and Type	Field and Description
static boolean[]	EMPTY_ARRAY_BOOLEAN An empty boolean array.
static byte[]	EMPTY_ARRAY_BYTE An empty byte array.
static char[]	EMPTY_ARRAY_CHAR An empty char array.
static double[]	EMPTY_ARRAY_DOUBLE An empty double array.
static float[]	EMPTY_ARRAY_FLOAT An empty float array.
static int[]	EMPTY_ARRAY_INT An empty int array.
static long[]	EMPTY_ARRAY_LONG An empty long array.
static short[]	EMPTY_ARRAY_SHORT An empty short array.
static String[]	EMPTY_ARRAY_STRING An empty string array.

Constructor Summary

Constructors

Constructor and Description
StringCollectionToPrimitiveArray()

Method Summary

Modifier and Type	Method and Description
boolean[]	stringCollectionToBooleanArray(Collection<String> strings) Convert a String Collection containing booleans to a String array.
byte[]	stringCollectionToByteArray(Collection<String> strings) Convert a String Collection containing bytes to a String array.
char[]	stringCollectionToCharArray(Collection<String> strings) Convert a String Collection containing chars to a String array.
double[]	stringCollectionToDoubleArray(Collection<String> strings) Convert a String Collection containing doubles to a String array.
float[]	stringCollectionToFloatArray(Collection<String> strings) Convert a String Collection containing floats to a String array.
int[]	stringCollectionToIntArray(Collection<String> strings) Convert a String Collection containing ints to a String array.
long[]	stringCollectionToLongArray(Collection<String> strings) Convert a String Collection containing longs to a String array.
short[]	stringCollectionToShortArray(Collection<String> strings) Convert a String Collection containing shorts to a String array.
String[]	stringCollectionToStringArray(Collection<String> strings) Convert a String Collection to a String array.

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_ARRAY_STRING

public static final String[] EMPTY_ARRAY_STRING

An empty string array.

EMPTY_ARRAY_BYTE

public static final byte[] EMPTY_ARRAY_BYTE

An empty byte array.

EMPTY_ARRAY_SHORT

public static final short[] EMPTY_ARRAY_SHORT

An empty short array.

EMPTY_ARRAY_INT

public static final int[] EMPTY_ARRAY_INT

An empty int array.

EMPTY_ARRAY_LONG

public static final long[] EMPTY_ARRAY_LONG

An empty long array.

EMPTY_ARRAY_FLOAT

public static final float[] EMPTY_ARRAY_FLOAT

An empty float array.

EMPTY_ARRAY_DOUBLE

public static final double[] EMPTY_ARRAY_DOUBLE

An empty double array.

EMPTY_ARRAY_BOOLEAN

public static final boolean[] EMPTY_ARRAY_BOOLEAN

An empty boolean array.

EMPTY_ARRAY_CHAR

public static final char[] EMPTY_ARRAY_CHAR

An empty char array.

Constructor Detail

StringCollectionToPrimitiveArray

public StringCollectionToPrimitiveArray()

Method Detail

stringCollectionToStringArray

public String[] stringCollectionToStringArray(Collection<String> strings)

Convert a String Collection to a String array. No further converts. null values in the collection are allowed and will be null values in the array.

Parameters:

strings - The Strings. Can be null.

Returns:

The String array. Never be null, may be empty.

stringCollectionToByteArray

public byte[] stringCollectionToByteArray(Collection<String> strings)

Convert a String Collection containing bytes to a String array. Convert all entries using Byte.parseByte(String). null values in the collection are not allowed and throw a NumberFormatException.

Parameters:

strings - The Strings. Can be null.

Returns:

The byte array. Never be null, may be empty.

stringCollectionToShortArray

public short[] stringCollectionToShortArray(Collection<String> strings)

Convert a String Collection containing shorts to a String array. Convert all entries using Short.parseShort(String). null values in the collection are not allowed and throw a NumberFormatException.

Parameters:

strings - The Strings. Can be null.

Returns:

The short array. Never be null, may be empty.

stringCollectionToIntArray

public int[] stringCollectionToIntArray(Collection<String> strings)

Convert a String Collection containing ints to a String array. Convert all entries using Integer.parseInt(String). null values in the collection are not allowed and throw a NumberFormatException.

Parameters:

strings - The Strings. Can be null.

Returns:

The int array. Never be null, may be empty.

stringCollectionToLongArray

public long[] stringCollectionToLongArray(Collection<String> strings)

Convert a String Collection containing longs to a String array. Convert all entries using Long.parseLong(String). null values in the collection are not allowed and throw a NumberFormatException.

Parameters:

strings - The Strings. Can be null.

Returns:

The long array. Never be null, may be empty.

stringCollectionToFloatArray

public float[] stringCollectionToFloatArray(Collection<String> strings)

Convert a String Collection containing floats to a String array. Convert all entries using Float.parseFloat(String). null values in the collection are not allowed and throw a NullPointerException.

Parameters:

strings - The Strings. Can be null.

Returns:

The float array. Never be null, may be empty.

stringCollectionToDoubleArray

public double[] stringCollectionToDoubleArray(Collection<String> strings)

Convert a String Collection containing doubles to a String array. Convert all entries using Double.parseDouble(String). null values in the collection are not allowed and throw a NullPointerException.

Parameters:

strings - The Strings. Can be null.

Returns:

The double array. Never be null, may be empty.

stringCollectionToBooleanArray

public boolean[] stringCollectionToBooleanArray(Collection<String> strings)

Convert a String Collection containing booleans to a String array. Convert all entries using Boolean.parseBoolean(String). null values in the collection are allowed and will be converted to a false value.

Parameters:

strings - The Strings. Can be null.

Returns:

The boolean array. Never be null, may be empty.

stringCollectionToCharArray

public char[] stringCollectionToCharArray(Collection<String> strings)

Convert a String Collection containing chars to a String array. Convert all entries using String.charAt(int). null values in the collection are not allowed and throw a NullPointerException.

Parameters:

strings - The Strings. Can be null.

Returns:

The char array. Never be null, may be empty.