package client.net.sf.saxon.ce.tree.linked;
import client.net.sf.saxon.ce.om.AttributeCollection;
import client.net.sf.saxon.ce.om.Item;
import client.net.sf.saxon.ce.om.NodeInfo;
import client.net.sf.saxon.ce.om.SequenceIterator;
import client.net.sf.saxon.ce.pattern.NameTest;
import client.net.sf.saxon.ce.pattern.NodeTest;
import client.net.sf.saxon.ce.tree.iter.AxisIteratorImpl;
import client.net.sf.saxon.ce.type.Type;
/**
* AttributeEnumeration is an enumeration of all the attribute nodes of an Element.
*/
final class AttributeEnumeration extends AxisIteratorImpl {
private ElementImpl element;
private AttributeCollection attributes;
private NodeTest nodeTest;
private NodeInfo next;
private int index;
private int length;
/**
* Constructor
* @param node: the element whose attributes are required. This may be any type of node,
* but if it is not an element the enumeration will be empty
* @param nodeTest: condition to be applied to the names of the attributes selected
*/
public AttributeEnumeration(NodeImpl node, NodeTest nodeTest) {
this.nodeTest = nodeTest;
if (node.getNodeKind()==Type.ELEMENT) {
element = (ElementImpl)node;
attributes = element.getAttributeList();
AttributeCollection attlist = element.getAttributeList();
index = 0;
if (nodeTest instanceof NameTest) {
NameTest test = (NameTest)nodeTest;
index = attlist.getIndexByFingerprint(test.getFingerprint());
if (index<0) {
next = null;
} else {
next = new AttributeImpl(element, index);
index = 0;
length = 0; // force iteration to select one node only
}
} else {
index = 0;
length = attlist.getLength();
advance();
}
}
else { // if it's not an element, or if we're not looking for attributes,
// then there's nothing to find
next = null;
index = 0;
length = 0;
}
}
/**
* Get the next node in the iteration, or null if there are no more.
*/
public Item next() {
if (next == null) {
current = null;
position = -1;
return null;
} else {
current = next;
position++;
advance();
return current;
}
}
/**
* Move to the next node in the enumeration.
*/
private void advance() {
while (true) {
if (index >= length) {
next = null;
return;
} else {
next = new AttributeImpl(element, index);
index++;
if (nodeTest.matches(next)) {
return;
}
}
}
}
/**
* Get another enumeration of the same nodes
*/
public SequenceIterator getAnother() {
return new AttributeEnumeration(element, nodeTest);
}
/**
* Get properties of this iterator, as a bit-significant integer.
*
* @return the properties of this iterator. This will be some combination of
* properties such as {@link #GROUNDED}, {@link #LAST_POSITION_FINDER}. It is always
* acceptable to return the value zero, indicating that there are no known special properties.
* It is acceptable for the properties of the iterator to change depending on its state.
*/
public int getProperties() {
return 0;
}
}
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is “Incompatible With Secondary Licenses”, as defined by the Mozilla Public License, v. 2.0.