jodd-joy/src/main/java/jodd/joy/page/PageData.java
public static int calcFirstItemIndexOfPage(final PageRequest pageRequest, final int total) {
		return calcFirstItemIndexOfPage(pageRequest.getPage(), pageRequest.getSize(), total);
	}
public static int calcFirstItemIndexOfPage(final PageRequest pageRequest, final int total) {
		return calcFirstItemIndexOfPage(pageRequest.getPage(), pageRequest.getSize(), total);
	}
Calculates first item index of the page.