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