package net.sf.saxon.tinytree;
import net.sf.saxon.om.NamePool;
import java.util.Iterator;
/**
* An iterator supplying the prefixes of the declared namespaces for an element node in a TinyTree
*/
final class DeclaredPrefixIterator implements Iterator {
private TinyTree tree;
private NamePool pool;
private int owner;
private int index;
public DeclaredPrefixIterator(TinyElementImpl node) {
owner = node.nodeNr;
tree = node.tree;
pool = tree.getNamePool();
index = tree.beta[owner]; // by convention
}
/**
* Returns <tt>true</tt> if the iteration has more elements. (In other
* words, returns <tt>true</tt> if <tt>next</tt> would return an element
* rather than throwing an exception.)
*
* @return <tt>true</tt> if the iterator has more elements.
*/
public boolean hasNext() {
return index >= 0 && tree.namespaceParent[index] == owner;
}
/**
* Returns the next element in the iteration. Calling this method
* repeatedly until the {@link #hasNext()} method returns false will
* return each element in the underlying collection exactly once.
*
* @return the next element in the iteration.
* @throws java.util.NoSuchElementException
* iteration has no more elements.
*/
public Object next() {
int nscode = tree.namespaceCode[index--];
return pool.getPrefix(nscode>>16);
}
/**
* Removes from the underlying collection the last element returned by the
* iterator (optional operation). This method can be called only once per
* call to <tt>next</tt>. The behavior of an iterator is unspecified if
* the underlying collection is modified while the iteration is in
* progress in any way other than by calling this method.
*
* @throws UnsupportedOperationException if the <tt>remove</tt>
* operation is not supported by this Iterator.
* @throws IllegalStateException if the <tt>next</tt> method has not
* yet been called, or the <tt>remove</tt> method has already
* been called after the last call to the <tt>next</tt>
* method.
*/
public void remove() {
throw new UnsupportedOperationException();
}
}
//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
// you may not use this file except in compliance with the License. You may obtain a copy of the
// License at http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael H. Kay.
//
// Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
//
// Contributor(s): none.
//
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