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Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.

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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 "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.xerces.stax.events;

import java.io.IOException;
import java.io.Writer;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;

import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.Location;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.Attribute;
import javax.xml.stream.events.Namespace;
import javax.xml.stream.events.StartElement;

import org.apache.xerces.stax.DefaultNamespaceContext;

/**
 * @xerces.internal
 * 
 * @author Lucian Holland
 *
 * @version $Id: StartElementImpl.java 730796 2009-01-02 17:36:23Z mrglavas $
 */
public final class StartElementImpl extends ElementImpl implements StartElement {
    
    private static final Comparator QNAME_COMPARATOR = new Comparator() {
        public int compare(Object o1, Object o2) {
            if (o1.equals(o2)) {
                return 0;
            }
            QName name1 = (QName) o1;
            QName name2 = (QName) o2;
            return name1.toString().compareTo(name2.toString());
        }};

    private final Map fAttributes;
    private final NamespaceContext fNamespaceContext;

    /**
     * @param location
     * @param schemaType
     */
    public StartElementImpl(final QName name, final Iterator attributes, final Iterator namespaces, final NamespaceContext namespaceContext, final Location location) {
        super(name, true, namespaces, location);
        if (attributes != null && attributes.hasNext()) {
            fAttributes = new TreeMap(QNAME_COMPARATOR);
            do {
                Attribute attr = (Attribute) attributes.next();
                fAttributes.put(attr.getName(), attr);
            }
            while (attributes.hasNext());
        }
        else {
            fAttributes = Collections.EMPTY_MAP;
        }
        fNamespaceContext = (namespaceContext != null) ? namespaceContext : DefaultNamespaceContext.getInstance();
    }

    /**
     * @see javax.xml.stream.events.StartElement#getAttributes()
     */
    public Iterator getAttributes() {
        return createImmutableIterator(fAttributes.values().iterator());
    }

    /**
     * @see javax.xml.stream.events.StartElement#getAttributeByName(javax.xml.namespace.QName)
     */
    public Attribute getAttributeByName(final QName name) {
        return (Attribute) fAttributes.get(name);
    }

    /**
     * @see javax.xml.stream.events.StartElement#getNamespaceContext()
     */
    public NamespaceContext getNamespaceContext() {
        return fNamespaceContext;
    }

    /**
     * @see javax.xml.stream.events.StartElement#getNamespaceURI(java.lang.String)
     */
    public String getNamespaceURI(final String prefix) {
        return fNamespaceContext.getNamespaceURI(prefix);
    }
    
    public void writeAsEncodedUnicode(Writer writer) throws XMLStreamException {
        try {
            // Write start tag.
            writer.write('<');
            QName name = getName();
            String prefix = name.getPrefix();
            if (prefix != null && prefix.length() > 0) {
                writer.write(prefix);
                writer.write(':');
            }
            writer.write(name.getLocalPart());
            // Write namespace declarations.
            Iterator nsIter = getNamespaces();
            while (nsIter.hasNext()) {
                Namespace ns = (Namespace) nsIter.next();
                writer.write(' ');
                ns.writeAsEncodedUnicode(writer);
            }
            // Write attributes
            Iterator attrIter = getAttributes();
            while (attrIter.hasNext()) {
                Attribute attr = (Attribute) attrIter.next();
                writer.write(' ');
                attr.writeAsEncodedUnicode(writer);
            }
            writer.write('>');
        }
        catch (IOException ioe) {
            throw new XMLStreamException(ioe);
        }
    }
}