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/**
 * SCA4J
 * Copyright (c) 2009 - 2099 Service Symphony Ltd
 *
 * Licensed to you under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.  A copy of the license
 * is included in this distrubtion or you may obtain a copy at
 *
 *    http://www.opensource.org/licenses/apache2.0.php
 *
 * 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.
 *
 * This project contains code licensed from the Apache Software Foundation under
 * the Apache License, Version 2.0 and original code from project contributors.
 *
 *
 * Original Codehaus Header
 *
 * Copyright (c) 2007 - 2008 fabric3 project contributors
 *
 * Licensed to you under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.  A copy of the license
 * is included in this distrubtion or you may obtain a copy at
 *
 *    http://www.opensource.org/licenses/apache2.0.php
 *
 * 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.
 *
 * This project contains code licensed from the Apache Software Foundation under
 * the Apache License, Version 2.0 and original code from project contributors.
 *
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 *
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 *
 * Apache Tuscany is an effort undergoing incubation at The Apache Software
 * Foundation (ASF), sponsored by the Apache Web Services PMC. Incubation is
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/*
 * 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
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 * KIND, either express or implied.  See the License for the
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package org.sca4j.introspection.xml;

import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;

/**
 * Utility functions to support loader implementations.
 *
 * @version $Rev: 3029 $ $Date: 2008-03-07 13:45:37 +0000 (Fri, 07 Mar 2008) $
 */
public final class LoaderUtil {
    private LoaderUtil() {
    }

    /**
     * Advance the stream to the next END_ELEMENT event skipping any nested content.
     *
     * @param reader the reader to advance
     * @throws XMLStreamException if there was a problem reading the stream
     */
    public static void skipToEndElement(XMLStreamReader reader) throws XMLStreamException {
        int depth = 0;
        while (true) {
            int event = reader.next();
            if (event == XMLStreamConstants.START_ELEMENT) {
                depth++;
            } else if (event == XMLStreamConstants.END_ELEMENT) {
                if (depth == 0) {
                    return;
                }
                depth--;
            }
        }
    }

    /**
     * Construct a QName from an XML value.
     *
     * @param text             the text of an XML QName; if null or "" then null will be returned
     * @param defaultNamespace the default namespace to use if none is defined
     * @param context          the context for resolving namespace prefixes
     * @return a QName with the appropriate namespace set
     */
    public static QName getQName(String text, String defaultNamespace, NamespaceContext context) {
        if (text == null || text.length() == 0) {
            return null;
        }

        int index = text.indexOf(':');
        if (index < 1 || index == text.length() - 1) {
            // unqualifed form - use the default supplied
            return new QName(defaultNamespace, text);
        } else {
            String prefix = text.substring(0, index);
            String uri = context.getNamespaceURI(prefix);
            String localPart = text.substring(index + 1);
            return new QName(uri, localPart, prefix);
        }
    }

}