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 }