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.converter.jaxp;
018
019 import java.io.ByteArrayInputStream;
020 import java.io.InputStream;
021 import java.io.UnsupportedEncodingException;
022 import java.util.ArrayList;
023 import java.util.Iterator;
024 import java.util.List;
025
026 import javax.xml.transform.TransformerException;
027
028 import org.w3c.dom.Attr;
029 import org.w3c.dom.Element;
030 import org.w3c.dom.Node;
031 import org.w3c.dom.NodeList;
032 import org.w3c.dom.Text;
033
034 import org.apache.camel.Converter;
035 import org.apache.camel.Exchange;
036 import org.apache.camel.util.IOHelper;
037 import org.apache.camel.util.ObjectHelper;
038
039 /**
040 * Converts from some DOM types to Java types
041 *
042 * @version
043 */
044 @Converter
045 public final class DomConverter {
046 private final XmlConverter xml;
047
048 public DomConverter() {
049 xml = new XmlConverter();
050 }
051
052 @Converter
053 public String toString(NodeList nodeList, Exchange exchange) throws TransformerException {
054 // converting NodeList to String is more tricky
055 // sometimes the NodeList is a Node which we can then leverage
056 // the XML converter to turn into XML incl. tags
057
058 StringBuilder buffer = new StringBuilder();
059
060 // use XML converter at first since it preserves tag names
061 boolean found = false;
062 if (nodeList instanceof Node) {
063 Node node = (Node) nodeList;
064 String s = toString(node, exchange);
065 if (ObjectHelper.isNotEmpty(s)) {
066 found = true;
067 buffer.append(s);
068 }
069 } else {
070 // use XML converter at first since it preserves tag names
071 int size = nodeList.getLength();
072 for (int i = 0; i < size; i++) {
073 Node node = nodeList.item(i);
074 String s = toString(node, exchange);
075 if (ObjectHelper.isNotEmpty(s)) {
076 found = true;
077 buffer.append(s);
078 }
079 }
080 }
081
082 // and eventually we must fallback to append without tags, such as when you have
083 // used an xpath to select an attribute or text() or something
084 if (!found) {
085 append(buffer, nodeList);
086 }
087
088 return buffer.toString();
089 }
090
091 private String toString(Node node, Exchange exchange) throws TransformerException {
092 String s;
093 if (node instanceof Text) {
094 Text textnode = (Text) node;
095
096 StringBuilder b = new StringBuilder();
097 b.append(textnode.getNodeValue());
098 textnode = (Text) textnode.getNextSibling();
099 while (textnode != null) {
100 b.append(textnode.getNodeValue());
101 textnode = (Text) textnode.getNextSibling();
102 }
103 s = b.toString();
104 } else {
105 s = xml.toString(node, exchange);
106
107 }
108 return s;
109 }
110
111 @Converter
112 public static Integer toInteger(NodeList nodeList) {
113 StringBuilder buffer = new StringBuilder();
114 append(buffer, nodeList);
115 String s = buffer.toString();
116 return Integer.valueOf(s);
117 }
118
119 @Converter
120 public static Long toLong(NodeList nodeList) {
121 StringBuilder buffer = new StringBuilder();
122 append(buffer, nodeList);
123 String s = buffer.toString();
124 return Long.valueOf(s);
125 }
126
127 @Converter
128 public static List<?> toList(NodeList nodeList) {
129 List<Object> answer = new ArrayList<Object>();
130 Iterator<Object> it = ObjectHelper.createIterator(nodeList);
131 while (it.hasNext()) {
132 answer.add(it.next());
133 }
134 return answer;
135 }
136
137 @Converter
138 public InputStream toInputStream(NodeList nodeList, Exchange exchange) throws TransformerException, UnsupportedEncodingException {
139 return new ByteArrayInputStream(toByteArray(nodeList, exchange));
140 }
141
142 @Converter
143 public byte[] toByteArray(NodeList nodeList, Exchange exchange) throws TransformerException, UnsupportedEncodingException {
144 String data = toString(nodeList, exchange);
145 return data.getBytes(IOHelper.getCharsetName(exchange));
146 }
147
148 private static void append(StringBuilder buffer, NodeList nodeList) {
149 int size = nodeList.getLength();
150 for (int i = 0; i < size; i++) {
151 append(buffer, nodeList.item(i));
152 }
153 }
154
155 private static void append(StringBuilder buffer, Node node) {
156 if (node instanceof Text) {
157 Text text = (Text) node;
158 buffer.append(text.getTextContent());
159 } else if (node instanceof Attr) {
160 Attr attribute = (Attr) node;
161 buffer.append(attribute.getTextContent());
162 } else if (node instanceof Element) {
163 Element element = (Element) node;
164 append(buffer, element.getChildNodes());
165 }
166 }
167 }