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Groovy: A powerful multi-faceted language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* http://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 groovy.xml;
import groovy.namespace.QName;
import groovy.util.BuilderSupport;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.Map;
/**
* A helper class for creating a W3C DOM tree
*/
public class DOMBuilder extends BuilderSupport {
Document document;
DocumentBuilder documentBuilder;
public static DOMBuilder newInstance() throws ParserConfigurationException {
return newInstance(false, true);
}
public static DOMBuilder newInstance(boolean validating, boolean namespaceAware) throws ParserConfigurationException {
DocumentBuilderFactory factory = FactorySupport.createDocumentBuilderFactory();
factory.setNamespaceAware(namespaceAware);
factory.setValidating(validating);
return new DOMBuilder(factory.newDocumentBuilder());
}
/**
* Creates a DocumentBuilder and uses it to parse the XML text read from the given reader.
* A non-validating, namespace aware parser which does not allow DOCTYPE declarations is used.
*
* @param reader the reader to read the XML text from
* @return the root node of the parsed tree of Nodes
* @throws SAXException Any SAX exception, possibly wrapping another exception.
* @throws IOException An IO exception from the parser, possibly from a byte
* stream or character stream supplied by the application.
* @throws ParserConfigurationException if a DocumentBuilder cannot be created which satisfies
* the configuration requested.
* @see #parse(Reader, boolean, boolean)
*/
public static Document parse(Reader reader) throws SAXException, IOException, ParserConfigurationException {
return parse(reader, false, true);
}
/**
* Creates a DocumentBuilder and uses it to parse the XML text read from the given reader, allowing
* parser validation and namespace awareness to be controlled. Documents are not allowed to contain
* DOCYTYPE declarations.
*
* @param reader the reader to read the XML text from
* @param validating whether to validate the XML
* @param namespaceAware whether the parser should be namespace aware
* @return the root node of the parsed tree of Nodes
* @throws SAXException Any SAX exception, possibly wrapping another exception.
* @throws IOException An IO exception from the parser, possibly from a byte
* stream or character stream supplied by the application.
* @throws ParserConfigurationException if a DocumentBuilder cannot be created which satisfies
* the configuration requested.
*/
public static Document parse(Reader reader, boolean validating, boolean namespaceAware)
throws SAXException, IOException, ParserConfigurationException {
return parse(reader, validating, namespaceAware, false);
}
/**
* Creates a DocumentBuilder and uses it to parse the XML text read from the given reader, allowing
* parser validation, namespace awareness and permission of DOCTYPE declarations to be controlled.
*
* @param reader the reader to read the XML text from
* @param validating whether to validate the XML
* @param namespaceAware whether the parser should be namespace aware
* @param allowDocTypeDeclaration whether the parser should allow DOCTYPE declarations
* @return the root node of the parsed tree of Nodes
* @throws SAXException Any SAX exception, possibly wrapping another exception.
* @throws IOException An IO exception from the parser, possibly from a byte
* stream or character stream supplied by the application.
* @throws ParserConfigurationException if a DocumentBuilder cannot be created which satisfies
* the configuration requested.
*/
public static Document parse(Reader reader, boolean validating, boolean namespaceAware, boolean allowDocTypeDeclaration)
throws SAXException, IOException, ParserConfigurationException {
DocumentBuilderFactory factory = FactorySupport.createDocumentBuilderFactory();
factory.setNamespaceAware(namespaceAware);
factory.setValidating(validating);
XmlUtil.setFeatureQuietly(factory, XMLConstants.FEATURE_SECURE_PROCESSING, true);
XmlUtil.setFeatureQuietly(factory, "http://apache.org/xml/features/disallow-doctype-decl", !allowDocTypeDeclaration);
DocumentBuilder documentBuilder = factory.newDocumentBuilder();
return documentBuilder.parse(new InputSource(reader));
}
/**
* A helper method to parse the given text as XML.
*
* @param text the XML text to parse
* @return the root node of the parsed tree of Nodes
* @throws SAXException Any SAX exception, possibly wrapping another exception.
* @throws IOException An IO exception from the parser, possibly from a byte
* stream or character stream supplied by the application.
* @throws ParserConfigurationException if a DocumentBuilder cannot be created which satisfies
* the configuration requested.
* @see #parse(Reader)
*/
public Document parseText(String text) throws SAXException, IOException, ParserConfigurationException {
return parse(new StringReader(text));
}
public DOMBuilder(Document document) {
this.document = document;
}
public DOMBuilder(DocumentBuilder documentBuilder) {
this.documentBuilder = documentBuilder;
}
@Override
protected void setParent(Object parent, Object child) {
Node current = (Node) parent;
Node node = (Node) child;
current.appendChild(node);
}
@Override
protected Object createNode(Object name) {
if (document == null) {
document = createDocument();
}
if (name instanceof QName) {
QName qname = (QName) name;
return document.createElementNS(qname.getNamespaceURI(), qname.getQualifiedName());
} else {
return document.createElement(name.toString());
}
}
protected Document createDocument() {
if (documentBuilder == null) {
throw new IllegalArgumentException("No Document or DOMImplementation available so cannot create Document");
} else {
return documentBuilder.newDocument();
}
}
@Override
protected Object createNode(Object name, Object value) {
Element element = (Element) createNode(name);
element.appendChild(document.createTextNode(value.toString()));
return element;
}
@Override
protected Object createNode(Object name, Map attributes, Object value) {
Element element = (Element) createNode(name, attributes);
element.appendChild(document.createTextNode(value.toString()));
return element;
}
@Override
protected Object createNode(Object name, Map attributes) {
Element element = (Element) createNode(name);
for (Object o : attributes.entrySet()) {
Map.Entry entry = (Map.Entry) o;
String attrName = entry.getKey().toString();
Object value = entry.getValue();
if ("xmlns".equals(attrName)) {
if (value instanceof Map) {
appendNamespaceAttributes(element, (Map) value);
} else if (value instanceof String) {
setStringNS(element, "", value);
} else {
throw new IllegalArgumentException("The value of the xmlns attribute must be a Map of QNames to String URIs");
}
} else if (attrName.startsWith("xmlns:") && value instanceof String) {
setStringNS(element, attrName.substring(6), value);
} else {
String valueText = (value != null) ? value.toString() : "";
element.setAttribute(attrName, valueText);
}
}
return element;
}
protected void appendNamespaceAttributes(Element element, Map attributes) {
for (Map.Entry entry : attributes.entrySet()) {
Object key = entry.getKey();
Object value = entry.getValue();
if (value == null) {
throw new IllegalArgumentException("The value of key: " + key + " cannot be null");
}
if (key instanceof String) {
setStringNS(element, key, value);
} else if (key instanceof QName) {
QName qname = (QName) key;
element.setAttributeNS(qname.getNamespaceURI(), qname.getQualifiedName(), value.toString());
} else {
throw new IllegalArgumentException("The key: " + key + " should be an instance of " + QName.class);
}
}
}
private static void setStringNS(Element element, Object key, Object value) {
String prefix = (String) key;
element.setAttributeNS("http://www.w3.org/2000/xmlns/", "".equals(prefix) ? "xmlns" : "xmlns:" + prefix, value.toString());
}
}
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