import com.sun.org.apache.xerces.internal.util.AugmentationsImpl; //导入依赖的package包/类
public void setAttributes(AttributeMap attributes, CoreDocumentImpl doc, ElementImpl elem) {
    fDocument = doc;
    fAttributes = attributes;
    fElement = elem;
    if (attributes != null) {
        int length = attributes.getLength();

        fAugmentations.setSize(length);
        // REVISIT: this implementation does not store any value in augmentations
        //          and basically not keeping augs in parallel to attributes map
        //          untill all attributes are added (default attributes)
        for (int i = 0; i < length; i++) {
            fAugmentations.setElementAt(new AugmentationsImpl(), i);
        }
    } else {
        fAugmentations.setSize(0);
    }
}
 

import com.sun.org.apache.xerces.internal.util.AugmentationsImpl; //导入依赖的package包/类
/**
* This method adds default declarations
        * @see com.sun.org.apache.xerces.internal.xni.XMLAttributes#addAttribute(QName, String, String)
        */
       public int addAttribute(QName qname, String attrType, String attrValue) {
               int index = fElement.getXercesAttribute(qname.uri, qname.localpart);
               // add defaults to the tree
               if (index < 0) {
       // the default attribute was removed by a user and needed to
       // be added back
                       AttrImpl attr = (AttrImpl)
                               ((CoreDocumentImpl) fElement.getOwnerDocument()).createAttributeNS(
                                       qname.uri,
                                       qname.rawname,
                                       qname.localpart);
       // REVISIT: the following should also update ID table
       attr.setNodeValue(attrValue);
       index = fElement.setXercesAttributeNode(attr);
       fAugmentations.insertElementAt(new AugmentationsImpl(), index);
       attr.setSpecified(false);
               }
               else {
       // default attribute is in the tree
       // we don't need to do anything since prefix was already fixed
       // at the namespace fixup time and value must be same value, otherwise
       // attribute will be treated as specified and we will never reach
       // this method.

   }
   return index;
       }