001    //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/framework/xml/NamespaceContext.java $
002    /*----------------------------------------------------------------------------
003     This file is part of deegree, http://deegree.org/
004     Copyright (C) 2001-2009 by:
005       Department of Geography, University of Bonn
006     and
007       lat/lon GmbH
008    
009     This library is free software; you can redistribute it and/or modify it under
010     the terms of the GNU Lesser General Public License as published by the Free
011     Software Foundation; either version 2.1 of the License, or (at your option)
012     any later version.
013     This library is distributed in the hope that it will be useful, but WITHOUT
014     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
015     FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
016     details.
017     You should have received a copy of the GNU Lesser General Public License
018     along with this library; if not, write to the Free Software Foundation, Inc.,
019     59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
020    
021     Contact information:
022    
023     lat/lon GmbH
024     Aennchenstr. 19, 53177 Bonn
025     Germany
026     http://lat-lon.de/
027    
028     Department of Geography, University of Bonn
029     Prof. Dr. Klaus Greve
030     Postfach 1147, 53001 Bonn
031     Germany
032     http://www.geographie.uni-bonn.de/deegree/
033    
034     e-mail: info@deegree.org
035    ----------------------------------------------------------------------------*/
036    package org.deegree.framework.xml;
037    
038    import java.net.URI;
039    import java.util.HashMap;
040    import java.util.Map;
041    import java.util.Set;
042    
043    import org.deegree.ogcbase.CommonNamespaces;
044    
045    /**
046     * Implementation of Jaxen's (http://jaxen.codehaus.org) <code>NamespaceContext</code> interface.
047     * <p>
048     * NOTE: This should be used everywhere inside deegree, don't use
049     * <code>org.jaxen.SimpleNamespaceContext</code> -- this prevents unnecessary binding to Jaxen.
050     *
051     * @author <a href="mailto:schneider@lat-lon.de">Markus Schneider </a>
052     * @author last edited by: $Author: mschneider $
053     *
054     * @version $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18 Jun 2009) $
055     */
056    public class NamespaceContext implements org.jaxen.NamespaceContext {
057    
058        // keys: prefices (String), values: namespaces (URI)
059        private Map<String, URI> namespaceMap = new HashMap<String, URI>();
060    
061        /**
062         * Creates a new instance of <code>NamespaceContext</code> with only the prefix 'xmlns:' being
063         * bound.
064         */
065        public NamespaceContext() {
066            this.namespaceMap.put( CommonNamespaces.XMLNS_PREFIX, CommonNamespaces.XMLNS );
067        }
068    
069        /**
070         * Creates a new instance of <code>NamespaceContext</code> that contains all the bindings from
071         * the argument <code>NamespaceContext</code>.
072         *
073         * @param nsContext
074         *            bindings to copy
075         */
076        public NamespaceContext( NamespaceContext nsContext ) {
077            this.namespaceMap = new HashMap<String, URI>( nsContext.namespaceMap );
078        }
079    
080        /**
081         * @return the namespace map of the context.
082         */
083        public Map<String, URI> getNamespaceMap() {
084            return this.namespaceMap;
085        }
086    
087        /**
088         * registers a new prefix with an assigned namespace URI
089         *
090         * @param prefix
091         * @param namespace
092         */
093        public void addNamespace( String prefix, URI namespace ) {
094            this.namespaceMap.put( prefix, namespace );
095        }
096    
097        /**
098         * registeres all prexifes and assigned namespaces from another NamespaceContext. If a prefix
099         * already exists in this NamespaceContext it will be ignored.
100         *
101         * @param nsc
102         */
103        public void addAll( NamespaceContext nsc ) {
104            Map<String, URI> map = nsc.getNamespaceMap();
105            Set<String> keys = map.keySet();
106            for ( String key : keys ) {
107                if ( this.namespaceMap.get( key ) == null ) {
108                    this.namespaceMap.put( key, map.get( key ) );
109                }
110            }
111        }
112    
113        public String translateNamespacePrefixToUri( String prefix ) {
114            URI namespaceURI = this.namespaceMap.get( prefix );
115            return namespaceURI == null ? null : namespaceURI.toString();
116        }
117    
118        /**
119         * @param prefix to get the namespace for
120         * @return the URI (namespace) associated with the given prefix, or <code>null</code> if it was not found.
121         */
122        public URI getURI( String prefix ) {
123            return this.namespaceMap.get( prefix );
124        }
125    
126        @Override
127        public String toString() {
128            return namespaceMap.toString();
129        }
130    }