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package com.orientechnologies.common.util;

import java.lang.reflect.Array;

import com.orientechnologies.common.log.OLogManager;

@SuppressWarnings("unchecked")
public class OArrays {
	public static  T[] copyOf(final T[] iSource, final int iNewSize) {
		return (T[]) copyOf(iSource, iNewSize, iSource.getClass());
	}

	public static  T[] copyOf(final U[] iSource, final int iNewSize, final Class iNewType) {
		final T[] copy = ((Object) iNewType == (Object) Object[].class) ? (T[]) new Object[iNewSize] : (T[]) Array.newInstance(
				iNewType.getComponentType(), iNewSize);
		System.arraycopy(iSource, 0, copy, 0, Math.min(iSource.length, iNewSize));
		return copy;
	}

	public static  S[] copyOfRange(final S[] iSource, final int iBegin, final int iEnd) {
		return copyOfRange(iSource, iBegin, iEnd, (Class) iSource.getClass());
	}

	public static  D[] copyOfRange(final S[] iSource, final int iBegin, final int iEnd, final Class iClass) {
		final int newLength = iEnd - iBegin;
		if (newLength < 0)
			throw new IllegalArgumentException(iBegin + " > " + iEnd);
		final D[] copy = ((Object) iClass == (Object) Object[].class) ? (D[]) new Object[newLength] : (D[]) Array.newInstance(
				iClass.getComponentType(), newLength);
		System.arraycopy(iSource, iBegin, copy, 0, Math.min(iSource.length - iBegin, newLength));
		return copy;
	}

	public static byte[] copyOfRange(final byte[] iSource, final int iBegin, final int iEnd) {
		final int newLength = iEnd - iBegin;
		if (newLength < 0)
			throw new IllegalArgumentException(iBegin + " > " + iEnd);

		try {
			final byte[] copy = new byte[newLength];
			System.arraycopy(iSource, iBegin, copy, 0, Math.min(iSource.length - iBegin, newLength));
			return copy;
		} catch (OutOfMemoryError e) {
			OLogManager.instance().error(null, "Error on copying buffer of size %d bytes", e, newLength);
			throw e;
		}
	}

	public static int[] copyOf(final int[] iSource, final int iNewSize) {
		final int[] copy = new int[iNewSize];
		System.arraycopy(iSource, 0, copy, 0, Math.min(iSource.length, iNewSize));
		return copy;
	}
}