package org.pdf4j.saxon.expr;
import org.pdf4j.saxon.om.Item;
import org.pdf4j.saxon.om.SequenceIterator;
import org.pdf4j.saxon.trans.XPathException;
/**
* EveryItemMappingIterator applies a mapping function to each item in a sequence.
* The mapping function always returns a single item (never null)
* <p/>
* This is a specialization of the more general MappingIterator class, for use
* in cases where a single input item always maps to exactly one output item
*/
public final class EveryItemMappingIterator implements SequenceIterator {
private SequenceIterator base;
private ItemMappingFunction action;
private Item current = null;
/**
* Construct an ItemMappingIterator that will apply a specified ItemMappingFunction to
* each Item returned by the base iterator.
*
* @param base the base iterator
* @param action the mapping function to be applied
*/
public EveryItemMappingIterator(SequenceIterator base, ItemMappingFunction action) {
this.base = base;
this.action = action;
}
public Item next() throws XPathException {
Item nextSource = base.next();
if (nextSource == null) {
current = null;
return null;
}
// Call the supplied mapping function
current = action.map(nextSource);
return current;
}
public Item current() {
return current;
}
public int position() {
return base.position();
}
public void close() {
base.close();
}
public SequenceIterator getAnother() throws XPathException {
return new EveryItemMappingIterator(base.getAnother(), action);
}
/**
* 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 org.pdf4j.saxon.om.SequenceIterator#GROUNDED},
* {@link org.pdf4j.saxon.om.SequenceIterator#LAST_POSITION_FINDER},
* and {@link org.pdf4j.saxon.om.SequenceIterator#LOOKAHEAD}. 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;
}
}
//
// 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.
//