/**
 *
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package org.apache.tuscany.sdo.util;

import java.util.Comparator;

import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamReader;

import org.apache.tuscany.sdo.util.resource.RecordedEventXMLStreamReader;
import org.eclipse.emf.ecore.EDataType;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.emf.ecore.util.ExtendedMetaData;
import org.eclipse.emf.ecore.xmi.XMLResource;
import org.eclipse.emf.ecore.xml.type.internal.QName;

/**
 * StAX Deserializer. The instance isn't thread-safe, however it's safe to use
 * the instance any times on the same thread.
 */
public class StreamDeserializer implements XMLStreamConstants {
	protected XMLStreamReader reader;

	protected final XMLStreamReader play(RecordedEventXMLStreamReader.Tag tag) {
		return tag.play(reader);
	}

	protected String nameSpace, name;

	protected final boolean typedXSI() {
		name = reader.getAttributeValue(ExtendedMetaData.XSI_URI,
				XMLResource.TYPE);
		if (name == null)
			return false;
		int index = name.indexOf(':');
		if (index == -1)
			nameSpace = reader.getNamespaceURI(XMLConstants.DEFAULT_NS_PREFIX); // may
		// be
		// XMLConstants.NULL_NS_URI
		else {
			nameSpace = reader.getNamespaceURI(name.substring(0, index));
			name = name.substring(++index);
		}
		return true;
	}

	static protected Object value(Object type, String literal,
			NamespaceContext nameSpaces) {
		Object value = EcoreUtil.createFromString((EDataType) type, literal);
		if (!(value instanceof QName))
			return value;
		QName qName = (QName) value;
		// qName.setNamespaceURI(nameSpaces.getNamespaceURI(qName.getPrefix()));
		throw new UnsupportedOperationException(
				"not setting neamespace uri on qname!!!! - " + qName + " - "
						+ qName.getNamespaceURI() + " - " + qName.getPrefix());
		// return value;
	}

	static public class Attribute {
		public String name, value;
	}

	static public final class QualifiedAttribute extends Attribute {
		public String nameSpace;
	}

	static protected final Comparator EQUAL_NULL = new Comparator() {
		public int compare(Object v, Object NULL) {
			return v == null || v.equals(null) ? 0 : 1;
		}
	}, EQUAL = new Comparator() {
		public int compare(Object v, Object value) {
			return value.equals(v) ? 0 : -1;
		}
	}, SAME = new Comparator() {
		public int compare(Object v, Object value) {
			return value == v ? 0 : -1;
		}
	};
}