001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.builder.xml;
018    
019    import java.util.HashMap;
020    import java.util.Map;
021    import java.util.Set;
022    
023    /**
024     * A helper class for creating namespaces which can then be used to create XPath expressions
025     *
026     * @version $Revision: 1.1 $
027     */
028    public class NamespaceBuilder {
029        private Map<String, String> namespaces = new HashMap<String, String>();
030    
031        public static NamespaceBuilder namespaceContext() {
032            return new NamespaceBuilder();
033        }
034    
035        public static NamespaceBuilder namespaceContext(String prefix, String uri) {
036            return new NamespaceBuilder().namespace(prefix, uri);
037        }
038    
039        public NamespaceBuilder namespace(String prefix, String uri) {
040            namespaces.put(prefix, uri);
041            return this;
042        }
043    
044        /**
045         * Creates a new XPath expression using the current namespaces
046         *
047         * @param xpath the XPath expression
048         * @return a new XPath expression
049         */
050        public XPathBuilder xpath(String xpath) {
051            XPathBuilder answer = XPathBuilder.xpath(xpath);
052            Set<Map.Entry<String, String>> entries = namespaces.entrySet();
053            for (Map.Entry<String, String> entry : entries) {
054                answer.namespace(entry.getKey(), entry.getValue());
055            }
056            return answer;
057        }
058    }