On 2001.10.31 13:34 Stephane Hillion wrote:
> > From what you said it sounds like it is not possible and batik won't
> let me
> > do it.
> > I could not repeat the npe, it must be a combination of a number of
> > factors.
I found out that the npe occurs when I serialize the document to an object
stream and then read it back.
I have attached the code that displays the two problems.
import java.io.*;
import java.util.*;
import org.apache.batik.dom.svg.SVGDOMImplementation;
import org.apache.batik.dom.util.DOMUtilities;
import org.w3c.dom.*;
import org.w3c.dom.svg.SVGSVGElement;
import org.w3c.dom.svg.SVGDocument;
public class DOMImport {
static String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
public static void main(String[] args) {
Document doc = null;
try {
InputStream is = new FileInputStream("foo.xml");
javax.xml.parsers.DocumentBuilderFactory fact =
javax.xml.parsers.DocumentBuilderFactory.newInstance();
fact.setNamespaceAware(true);
doc = fact. newDocumentBuilder().parse(is);
} catch (Exception e) {
e.printStackTrace();
}
Element root = null;
root = doc.getDocumentElement();
DOMImplementation impl =
SVGDOMImplementation.getDOMImplementation();
Document svgDocument = impl.createDocument(svgNS, "svg", null);
Element svgRoot = svgDocument.getDocumentElement();
System.out.println("trying with DOMUtilities.importNode()");
try {
Document svgDoc1 = getSVGDocument1(root, "xmlns");
SVGSVGElement svg = ((SVGDocument) svgDoc1).getRootElement();
Node newsvg = svgDocument.importNode(svg, true);
svgRoot.appendChild(newsvg);
} catch (Throwable e) {
e.printStackTrace();
}
System.out.println("trying with DOMUtilities.importNode()");
try {
Document svgDoc1 = getSVGDocument1(root, "xmlns:svg");
SVGSVGElement svg = ((SVGDocument) svgDoc1).getRootElement();
Node newsvg = svgDocument.importNode(svg, true);
svgRoot.appendChild(newsvg);
} catch (Throwable e) {
e.printStackTrace();
}
System.out.println("trying with modified importNode()");
try {
Document svgDoc2 = getSVGDocument2(root, "xmlns");
SVGSVGElement svg = ((SVGDocument) svgDoc2).getRootElement();
Node newsvg = svgDocument.importNode(svg, true);
svgRoot.appendChild(newsvg);
} catch (Throwable e) {
e.printStackTrace();
}
System.out.println("trying with modified importNode()");
try {
Document svgDoc2 = getSVGDocument2(root, "xmlns:svg");
SVGSVGElement svg = ((SVGDocument) svgDoc2).getRootElement();
Node newsvg = svgDocument.importNode(svg, true);
svgRoot.appendChild(newsvg);
} catch (Throwable e) {
e.printStackTrace();
}
// this is causes an npe when importing the node
try {
Document svgDoc2 = getSVGDocument2(root, "xmlns");
ObjectOutputStream tempstream = new ObjectOutputStream(
new BufferedOutputStream(new FileOutputStream("temp.ser")));
tempstream.writeObject(svgDoc2);
tempstream.close();
File temp = new File("temp.ser");
System.out.println("page serialized to: " + temp.length());
temp = null;
ObjectInputStream in = new ObjectInputStream(
new BufferedInputStream(new FileInputStream("temp.ser")));
svgDoc2 = (Document) in.readObject();
in.close();
SVGSVGElement svg = ((SVGDocument) svgDoc2).getRootElement();
Element view = svgDocument.createElementNS(svgNS, "svg");
Node newsvg = svgDocument.importNode(svg, true);
view.appendChild(newsvg);
svgRoot.appendChild(view);
} catch (Throwable e) {
e.printStackTrace();
}
try {
PrintWriter writer = new PrintWriter(System.out);
DOMUtilities.writeDocument(svgDocument, writer);
writer.flush();
} catch (Exception e) {
e.printStackTrace();
}
System.exit(0);
}
static Document getSVGDocument1(Element ele, String attr) {
Document doc;
NodeList childs = ele.getChildNodes();
for (int i = 0; i < childs.getLength(); i++) {
Node obj = childs.item(i);
if (obj instanceof Element) {
//System.out.println(obj.getNodeName());
Element rootEle = (Element) obj;
String space = rootEle.getAttribute(attr);
if (svgNS.equals(space)) {
try {
doc = javax.xml.parsers.DocumentBuilderFactory.newInstance().
newDocumentBuilder().newDocument();
Node node = doc.importNode(obj, true);
doc.appendChild(node);
DOMImplementation impl =
SVGDOMImplementation.getDOMImplementation();
// due to namespace problem attributes are not cloned
doc = DOMUtilities.deepCloneDocument(doc, impl);
return doc;
} catch (Exception e) {
e.printStackTrace();
}
} else {
doc = getSVGDocument1(rootEle, attr);
if (doc != null) {
return doc;
}
}
}
}
return null;
}
static Document getSVGDocument2(Element ele, String attr) {
Document doc;
NodeList childs = ele.getChildNodes();
for (int i = 0; i < childs.getLength(); i++) {
Node obj = childs.item(i);
if (obj instanceof Element) {
//System.out.println(obj.getNodeName());
Element rootEle = (Element) obj;
String space = rootEle.getAttribute(attr);
if (svgNS.equals(space)) {
try {
doc = javax.xml.parsers.DocumentBuilderFactory.newInstance().
newDocumentBuilder().newDocument();
Node node = doc.importNode(obj, true);
doc.appendChild(node);
DOMImplementation impl =
SVGDOMImplementation.getDOMImplementation();
// due to namespace problem attributes are not cloned
doc = deepCloneDocument(doc, impl);
return doc;
} catch (Exception e) {
e.printStackTrace();
}
} else {
doc = getSVGDocument2(rootEle, attr);
if (doc != null) {
return doc;
}
}
}
}
return null;
}
public static Document deepCloneDocument(Document doc,
DOMImplementation impl) {
Element root = doc.getDocumentElement();
Document result =
impl.createDocument(svgNS, root.getNodeName(), null);
Element rroot = result.getDocumentElement();
boolean before = true;
for (Node n = doc.getFirstChild(); n != null;
n = n.getNextSibling()) {
if (n == root) {
before = false;
if (root.hasAttributes()) {
NamedNodeMap attr = root.getAttributes();
int len = attr.getLength();
for (int i = 0; i < len; i++) {
rroot.setAttributeNode(
(Attr) result.importNode(attr.item(i),
true));
}
}
for (Node c = root.getFirstChild(); c != null;
c = c.getNextSibling()) {
rroot.appendChild(result.importNode(c, true));
}
} else {
if (n.getNodeType() != Node.DOCUMENT_TYPE_NODE) {
if (before) {
result.insertBefore(result.importNode(n, true),
rroot);
} else {
result.appendChild(result.importNode(n, true));
}
}
}
}
return result;
}
}
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