spring DomContentHandler 源码
spring DomContentHandler 代码
文件路径:/spring-core/src/main/java/org/springframework/util/xml/DomContentHandler.java
/*
* Copyright 2002-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.util.xml;
import java.util.ArrayList;
import java.util.List;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.ProcessingInstruction;
import org.w3c.dom.Text;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
/**
* SAX {@code ContentHandler} that transforms callback calls to DOM {@code Node}s.
*
* @author Arjen Poutsma
* @since 3.0
* @see org.w3c.dom.Node
*/
class DomContentHandler implements ContentHandler {
private final Document document;
private final List<Element> elements = new ArrayList<>();
private final Node node;
/**
* Create a new instance of the {@code DomContentHandler} with the given node.
* @param node the node to publish events to
*/
DomContentHandler(Node node) {
this.node = node;
// The following pattern variable "doc" cannot be named "document" due to lacking
// support in Checkstyle: https://github.com/checkstyle/checkstyle/issues/10969
if (node instanceof Document doc) {
this.document = doc;
}
else {
this.document = node.getOwnerDocument();
}
}
private Node getParent() {
if (!this.elements.isEmpty()) {
return this.elements.get(this.elements.size() - 1);
}
else {
return this.node;
}
}
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) {
Node parent = getParent();
Element element = this.document.createElementNS(uri, qName);
for (int i = 0; i < attributes.getLength(); i++) {
String attrUri = attributes.getURI(i);
String attrQname = attributes.getQName(i);
String value = attributes.getValue(i);
if (!attrQname.startsWith("xmlns")) {
element.setAttributeNS(attrUri, attrQname, value);
}
}
element = (Element) parent.appendChild(element);
this.elements.add(element);
}
@Override
public void endElement(String uri, String localName, String qName) {
this.elements.remove(this.elements.size() - 1);
}
@Override
public void characters(char[] ch, int start, int length) {
String data = new String(ch, start, length);
Node parent = getParent();
Node lastChild = parent.getLastChild();
if (lastChild != null && lastChild.getNodeType() == Node.TEXT_NODE) {
((Text) lastChild).appendData(data);
}
else {
Text text = this.document.createTextNode(data);
parent.appendChild(text);
}
}
@Override
public void processingInstruction(String target, String data) {
Node parent = getParent();
ProcessingInstruction pi = this.document.createProcessingInstruction(target, data);
parent.appendChild(pi);
}
// Unsupported
@Override
public void setDocumentLocator(Locator locator) {
}
@Override
public void startDocument() {
}
@Override
public void endDocument() {
}
@Override
public void startPrefixMapping(String prefix, String uri) {
}
@Override
public void endPrefixMapping(String prefix) {
}
@Override
public void ignorableWhitespace(char[] ch, int start, int length) {
}
@Override
public void skippedEntity(String name) {
}
}
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