package org.litesoft.core.typeutils;

import org.litesoft.core.util.*;

public class Objects
{
    public static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];

    public static void assertNull( String pObjectName, Object pToBeAssert )
            throws IllegalArgumentException
    {
        if ( pToBeAssert != null )
        {
            throw new IllegalArgumentException( pObjectName + ": Expected null, but was'" + pToBeAssert + "'" );
        }
    }

    public static <T> T assertNotNull( String pObjectName, T pToBeAssert )
            throws IllegalArgumentException
    {
        if ( pToBeAssert == null )
        {
            throw new IllegalArgumentException( pObjectName + UtilsCommon.NOT_ALLOWED_TO_BE_NULL );
        }
        return pToBeAssert;
    }

    public static void assertEqual( String pObjectName, Object pExpected, Object pActual )
            throws IllegalArgumentException
    {
        if ( null == pExpected && null == pActual )
        {
            return;
        }
        if ( null != pExpected && !pExpected.equals( pActual ) )
        {
            throw new IllegalArgumentException( pObjectName + ": Expected '" + pExpected + "', but was '" + pActual + "'" );
        }
    }

    public static boolean areNonArraysEqual( Object pThis, Object pThat )
    {
        if ( pThis == pThat ) // Same or both null
        {
            return true;
        }
        // Both CAN'T be null
        return (pThis != null) ? pThis.equals( pThat ) : pThat.equals( pThis );
    }

    public static <T> T deNull( T pToCheck, T pDefault )
    {
        return (pToCheck != null) ? pToCheck : pDefault;
    }

    public static Object[] appendObjectArrays( Object[] pArray1, Object[] pArray2 )
    {
        if ( UtilsCommon.isNullOrEmpty( pArray2 ) )
        {
            return pArray1;
        }
        if ( UtilsCommon.isNullOrEmpty( pArray1 ) )
        {
            return pArray2;
        }
        Object[] joined = new Object[pArray1.length + pArray2.length];
        System.arraycopy( pArray1, 0, joined, 0, pArray1.length );
        System.arraycopy( pArray2, 0, joined, pArray1.length, pArray2.length );
        return joined;
    }

    public static Object[] prependObject( Object pNewFirst, Object[] pTheRest )
    {
        return appendObjectArrays( new Object[]{pNewFirst}, pTheRest );
    }

    public static Object[] appendObject( Object[] pCurArray, Object pNewLast )
    {
        return appendObjectArrays( pCurArray, new Object[]{pNewLast} );
    }
}