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Utility classes, APIs and tools for Java
package net.sf.javagimmicks.collections;
import java.util.AbstractList;
import java.util.Arrays;
import java.util.List;
/**
* A set of utility methods for arrays especially for converting arrays into
* instances of {@link List} with implicit boxing of primitive types as well as
* methods for boxing primitive type arrays into respective wrapped type arrays.
*/
public class ArrayUtils
{
private ArrayUtils()
{}
/**
* Wraps the given array into a fixed-size {@link List} of the given array
* type.
*
* @param array
* the array to wrap
* @return the resulting {@link List}
*
* @see Arrays#asList(Object...)
*/
public static List asList(final E... array)
{
return Arrays.asList(array);
}
/**
* Wraps the given int array into a fixed-size {@link List} of
* {@link Integer}s.
*
* @param array
* the array to wrap
* @return the resulting {@link List}
*/
public static List asList(final int... array)
{
return new AbstractList()
{
@Override
public Integer get(final int index)
{
return array[index];
}
@Override
public Integer set(final int index, final Integer element)
{
final int result = array[index];
array[index] = element;
return result;
}
@Override
public int size()
{
return array.length;
}
};
}
/**
* Wraps the given long array into a fixed-size {@link List} of
* {@link Long}s.
*
* @param array
* the array to wrap
* @return the resulting {@link List}
*/
public static List asList(final long... array)
{
return new AbstractList()
{
@Override
public Long get(final int index)
{
return array[index];
}
@Override
public Long set(final int index, final Long element)
{
final long result = array[index];
array[index] = element;
return result;
}
@Override
public int size()
{
return array.length;
}
};
}
/**
* Wraps the given byte array into a fixed-size {@link List} of
* {@link Byte}s.
*
* @param array
* the array to wrap
* @return the resulting {@link List}
*/
public static List asList(final byte... array)
{
return new AbstractList()
{
@Override
public Byte get(final int index)
{
return array[index];
}
@Override
public Byte set(final int index, final Byte element)
{
final byte result = array[index];
array[index] = element;
return result;
}
@Override
public int size()
{
return array.length;
}
};
}
/**
* Wraps the given short array into a fixed-size {@link List} of
* {@link Short}s.
*
* @param array
* the array to wrap
* @return the resulting {@link List}
*/
public static List asList(final short... array)
{
return new AbstractList()
{
@Override
public Short get(final int index)
{
return array[index];
}
@Override
public Short set(final int index, final Short element)
{
final short result = array[index];
array[index] = element;
return result;
}
@Override
public int size()
{
return array.length;
}
};
}
/**
* Wraps the given float array into a fixed-size {@link List} of
* {@link Float}s.
*
* @param array
* the array to wrap
* @return the resulting {@link List}
*/
public static List asList(final float... array)
{
return new AbstractList()
{
@Override
public Float get(final int index)
{
return array[index];
}
@Override
public Float set(final int index, final Float element)
{
final float result = array[index];
array[index] = element;
return result;
}
@Override
public int size()
{
return array.length;
}
};
}
/**
* Wraps the given double array into a fixed-size {@link List}
* of {@link Double}s.
*
* @param array
* the array to wrap
* @return the resulting {@link List}
*/
public static List asList(final double... array)
{
return new AbstractList()
{
@Override
public Double get(final int index)
{
return array[index];
}
@Override
public Double set(final int index, final Double element)
{
final double result = array[index];
array[index] = element;
return result;
}
@Override
public int size()
{
return array.length;
}
};
}
/**
* Wraps the given boolean array into a fixed-size {@link List}
* of {@link Boolean}s.
*
* @param array
* the array to wrap
* @return the resulting {@link List}
*/
public static List asList(final boolean... array)
{
return new AbstractList()
{
@Override
public Boolean get(final int index)
{
return array[index];
}
@Override
public Boolean set(final int index, final Boolean element)
{
final boolean result = array[index];
array[index] = element;
return result;
}
@Override
public int size()
{
return array.length;
}
};
}
/**
* Wraps the given char array into a fixed-size {@link List} of
* {@link Character}s.
*
* @param array
* the array to wrap
* @return the resulting {@link List}
*/
public static List asList(final char... array)
{
return new AbstractList()
{
@Override
public Character get(final int index)
{
return array[index];
}
@Override
public Character set(final int index, final Character element)
{
final char result = array[index];
array[index] = element;
return result;
}
@Override
public int size()
{
return array.length;
}
};
}
/**
* Converts the given int array into a {@link Integer} array.
*
* @param array
* the given array
* @return the converted array
*/
public static Integer[] wrap(final int... array)
{
return asList(array).toArray(new Integer[0]);
}
/**
* Converts the given long array into a {@link Long} array.
*
* @param array
* the given array
* @return the converted array
*/
public static Long[] wrap(final long... array)
{
return asList(array).toArray(new Long[0]);
}
/**
* Converts the given byte array into a {@link Byte} array.
*
* @param array
* the given array
* @return the converted array
*/
public static Byte[] wrap(final byte... array)
{
return asList(array).toArray(new Byte[0]);
}
/**
* Converts the given short array into a {@link Short} array.
*
* @param array
* the given array
* @return the converted array
*/
public static Short[] wrap(final short... array)
{
return asList(array).toArray(new Short[0]);
}
/**
* Converts the given float array into a {@link Float} array.
*
* @param array
* the given array
* @return the converted array
*/
public static Float[] wrap(final float... array)
{
return asList(array).toArray(new Float[0]);
}
/**
* Converts the given double array into a {@link Double} array.
*
* @param array
* the given array
* @return the converted array
*/
public static Double[] wrap(final double... array)
{
return asList(array).toArray(new Double[0]);
}
/**
* Converts the given boolean array into a {@link Boolean}
* array.
*
* @param array
* the given array
* @return the converted array
*/
public static Boolean[] wrap(final boolean... array)
{
return asList(array).toArray(new Boolean[0]);
}
/**
* Converts the given char array into a {@link Character} array.
*
* @param array
* the given array
* @return the converted array
*/
public static Character[] wrap(final char... array)
{
return asList(array).toArray(new Character[0]);
}
}
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