Innovimax-SARL/QuiXDM

/*
 * QuiXProc: efficient evaluation of XProc Pipelines.
 * Copyright (C) 2011-2018 Innovimax
 * All rights reserved.
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  You may obtain a copy of the License at
 *        http://www.apache.org/licenses/LICENSE-2.0*/
package innovimax.quixproc.datamodel.filter;

import java.util.Iterator;
import java.util.Stack;

import innovimax.quixproc.datamodel.IQuiXStream;
import innovimax.quixproc.datamodel.IQuiXToken;
import innovimax.quixproc.datamodel.QuiXQName;

public class AncestorContextFilter extends AQuiXEventStreamFilter {

    private final Stack<QuiXQName> ancestors;

    public AncestorContextFilter(final IQuiXStream<IQuiXToken> stream) {
        super(stream);
        this.ancestors = new Stack<QuiXQName>();
    }

    @Override
    public IQuiXToken process(final IQuiXToken item) {
        switch (item.getType()) {
        case START_ELEMENT:
            // this.ancestors.push(qevent.asNamedEvent().getQName());
            return item;
        case END_ELEMENT:
            // this.ancestors.pop();
            return item;
        default:
            return item;
        }
    }

    public Iterator<QuiXQName> ancestors() {
        return this.ancestors.iterator();
    }
}