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/*
 * Copyright (c) 2009-2015
 * 	IT-Consulting Stephan Schloepke (http://www.schloepke.de/)
 * 	klemm software consulting Mirko Klemm (http://www.klemm-scs.com/)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.jbasics.parser;

import org.jbasics.pattern.container.Stack;
import org.jbasics.types.container.ListStack;
import org.jbasics.types.tuples.Pair;

import java.net.URI;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class NamespacePrefixStack implements Iterable> {
	public final Map> prefixMappings;

	NamespacePrefixStack() {
		this.prefixMappings = new HashMap>();
	}

	public Iterator> iterator() {
		return null;
	}

	void pushMapping(String prefix, URI namespace) {
		Stack temp = this.prefixMappings.get(prefix);
		if (temp == null) {
			temp = new ListStack();
			this.prefixMappings.put(prefix, temp);
		}
		temp.push(namespace);
	}

	URI popMapping(String prefix) {
		Stack temp = this.prefixMappings.get(prefix);
		if (temp == null) {
			throw new IllegalStateException();
		}
		URI result = temp.pop();
		if (temp.isEmpty()) {
			this.prefixMappings.remove(prefix);
		}
		return result;
	}

	private class Itr implements Iterator> {
		private final Iterator>> mapItr;

		protected Itr(Map> stackMap) {
			this.mapItr = stackMap.entrySet().iterator();
		}

		public boolean hasNext() {
			return this.mapItr.hasNext();
		}

		public Pair next() {
			Map.Entry> temp = this.mapItr.next();
			return new Pair(temp.getKey(), temp.getValue().peek());
		}

		public void remove() {
			throw new UnsupportedOperationException();
		}
	}
}