drools-eclipse/org.drools.eclipse/src/main/java/org/drools/eclipse/util/ArrayUtils.java
public static int indexOf(Object[] array,
                              Object objectToFind,
                              int startIndex) {
        if ( array == null ) {
            return INDEX_NOT_FOUND;
        }
        if ( startIndex < 0 ) {
            startIndex = 0;
        }
        if ( objectToFind == null ) {
            for ( int i = startIndex; i < array.length; i++ ) {
                if ( array[i] == null ) {
                    return i;
                }
            }
        } else {
            for ( int i = startIndex; i < array.length; i++ ) {
                if ( objectToFind.equals( array[i] ) ) {
                    return i;
                }
            }
        }
        return INDEX_NOT_FOUND;
    }
public static int indexOf(Object[] array,
                              Object objectToFind,
                              int startIndex) {
        if ( array == null ) {
            return INDEX_NOT_FOUND;
        }
        if ( startIndex < 0 ) {
            startIndex = 0;
        }
        if ( objectToFind == null ) {
            for ( int i = startIndex; i < array.length; i++ ) {
                if ( array[i] == null ) {
                    return i;
                }
            }
        } else {
            for ( int i = startIndex; i < array.length; i++ ) {
                if ( objectToFind.equals( array[i] ) ) {
                    return i;
                }
            }
        }
        return INDEX_NOT_FOUND;
    }
<p>Finds the index of the given object in the array starting at the given index.</p>

<p>This method returns {@link #INDEX_NOT_FOUND} (<code>-1</code>) for a <code>null</code> input array.</p>

<p>A negative startIndex is treated as zero. A startIndex larger than the array
length will return {@link #INDEX_NOT_FOUND} (<code>-1</code>).</p>

@param array  the array to search through for the object, may be <code>null</code>
@param objectToFind  the object to find, may be <code>null</code>
@param startIndex  the index to start searching at
@return the index of the object within the array starting at the index,
{@link #INDEX_NOT_FOUND} (<code>-1</code>) if not found or <code>null</code> array input