Review

finding-7

/mubench/checkouts/itext/5091/build/src/main/java/com/itextpdf/text/pdf/PdfLayer.java

addChild(PdfLayer)

class PdfLayer {
    /**
     * Adds a child layer. Nested layers can only have one parent.
     * @param child the child layer
     */
    public void addChild(PdfLayer child) {
        if (child.parent != null)
            throw new IllegalArgumentException(MessageLocalization.getComposedMessage("the.layer.1.already.has.a.parent", child.getAsString(PdfName.NAME).toUnicodeString()));
        child.parent = this;
        if (children == null)
            children = new ArrayList<PdfLayer>();
        children.add(child);
    }

}