Android Array Join join(final Class pClass, final T[]... pArrays)

Description

join

Parameter

Parameter	Description
pClass	the type of the returned array T[].
pArrays	items or pArrays itself can be null.

Return

null when pArrays is null or all arrays in pArrays are null or of length zero. Otherwise an in-order joined array of T[] of all not null, not zero length arrays in pArrays.

Declaration

@SuppressWarnings("unchecked")
public static <T> T[] join(final Class<T> pClass, final T[]... pArrays) 

Method Source Code

//package com.java2s;

public class Main {
    /**/*from  ww  w.  jav  a2 s.c o  m*/
     * @param pClass the type of the returned array T[].
     * @param pArrays items or pArrays itself can be null.
     * @return <code>null</code> when pArrays is <code>null</code> or all arrays in pArrays are <code>null</code> or of length zero. Otherwise an in-order joined array of <code>T[]</code> of all not null, not zero length arrays in pArrays.
     */
    @SuppressWarnings("unchecked")
    public static <T> T[] join(final Class<T> pClass, final T[]... pArrays) {
        if (pArrays == null) {
            return null;
        }

        final int arrayCount = pArrays.length;
        if (arrayCount == 0) {
            return null;
        } else if (arrayCount == 1) {
            return pArrays[0];
        }

        int resultLength = 0;
        /* Determine length of result. */
        for (int i = pArrays.length - 1; i >= 0; i--) {
            final T[] array = pArrays[i];
            if ((array != null) && (array.length > 0)) {
                resultLength += array.length;
            }
        }

        if (resultLength == 0) {
            return null;
        }

        /* Determine length of result. */
        final T[] result = (T[]) java.lang.reflect.Array.newInstance(
                pClass.getComponentType(), resultLength);
        int offset = 0;
        for (int i = 0; i < arrayCount; i++) {
            final T[] array = pArrays[i];
            if ((array != null) && (array.length > 0)) {
                System.arraycopy(array, 0, result, offset, array.length);
                offset += array.length;
            }
        }
        return result;
    }
}

Related

1. concatenate(String separator, T... values)
2. join(long[] follows)
3. getList(long[] s, String separator, String quote)
4. join(int[] follows)
5. join(long[] follows)