Jackson and XHTML
st...@heliossoftware.com
Tatu Saloranta
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st...@heliossoftware.com
On Monday, March 13, 2017 at 1:33:20 PM UTC-4, Tatu Saloranta wrote:
Jackson XML backend does not really support mixed content -- content model that has both non-whitespace text AND elements. This is difficult to represent with databinding, and is mostly operated with XML-centric models like DOM.There has been some talk about exposing this in some form or fashion, and I think there's an open issue or two.But I am not aware of particularly clean design for exposing this; it seems fundamentally at odds with typical POJOs that do not cater for XML infoset.-+ Tatu +-
On Mon, Mar 13, 2017 at 6:55 AM, <st...@heliossoftware.com> wrote:
Is it possible to use Jackson to parse XHTML? I am trying to parse this fragment, and the inline <i>,</i> and <b></b> tags are giving me some problems.<div xmlns="http://www.w3.org/1999/xhtml"><p>This is an <i>example</i> with some <b>xhtml</b> formatting.</p></div>I'm getting an exception:java.io.IOException: Expected END_ELEMENT, got event of type 1Is there a way to configure Jackson to make this work?Thanks,Steve
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Tatu Saloranta
to do that, since pieces (FromXmlParser) are constructed by others.
Your best bet may be to pre-process content. But beyond that, how
would and should data be mapped?
JsonNode does not work that well with XML content (it is not
officially supported although does work for some cases), so ideally
result would be a POJO. But how would separate text (cdata) segments
be bound?
-+ Tatu +-
st...@heliossoftware.com
Tatu Saloranta
InputDecorator/OutputDecorator allow wrapping of parser/generator
using delegation.
Implementation of such wrapper can extend
JsonParserDelegate/JsonGeneratorDelegate (or sub-classes
FilteringParserDelegate/FilteringGeneratorDelegate) and those are
designed to allow efficient if not convenient removal/addition of
low-level tokens/events.
-+ Tatu +-
Steve Munini
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Tatu Saloranta
Great that it works for your use case,
-+ Tatu +-
ps. I don't think anyone has written about such approach, so if you
wanted to write a blog post or article about your approach that'd
probably be well received.
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Alek Modi
Hi Steve, glad that you found a work around for this issue.
I have the exact same issue where I am expecting simple text but my client is sending text with HTML tags in the string value which is causing jackson to fail.
Can you please share the snippet of the code which worked for you?
Thanks, Alek.
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Steve Munini
package com.heliossoftware.fhir.utils;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.Iterator;
import java.util.LinkedList;
import com.fasterxml.jackson.core.io.IOContext;
import com.fasterxml.jackson.core.io.InputDecorator;
public class XmlInputDecorator extends InputDecorator {
private static final long serialVersionUID = -408865289583579353L;
@Override
public InputStream decorate(IOContext ctxt, InputStream in) throws IOException {
return new ReplacingInputStream(in);
}
class ReplacingInputStream extends FilterInputStream {
LinkedList<Integer> inQueue = new LinkedList<Integer>();
LinkedList<Integer> outQueue = new LinkedList<Integer>();
byte[] search = "http://www.w3.org/1999/xhtml".getBytes();
// byte[] div = "<div".getBytes();
byte[] slashDiv = "</div>".getBytes();
@Override
public int read(byte[] b, int off, int len) throws IOException {
// This gets called... not the others.
int numBytesRead = 0; // Number of bytes read into the buffer
// Continue to read() until we can't.
while (true) {
int next = read();
if (next == -1)
break;
if (numBytesRead >= len - off) { // do we have space in the buffer?
outQueue.addFirst(next); // put what was read, back in the buffer.
break;
}
b[numBytesRead + off] = (byte)next;
numBytesRead++;
}
return numBytesRead;
}
protected ReplacingInputStream(InputStream in) {
super(in);
}
@Override
public int read() throws IOException {
// Next byte already determined.
if (outQueue.isEmpty()) {
readAheadForSearchStart();
if (isMatchFoundSearchStart()) {
for (int i = 0; i < search.length; i++)
outQueue.add(inQueue.remove());
// read until next > is encountered, adding to the outQueue
while (true) {
int next = super.read();
outQueue.offer(next);
if (next == -1)
break;
if (next == '>')
break;
}
// Add <![CDATA[
byte[] cdataStart = "<![CDATA[".getBytes();
for (int i = 0; i < cdataStart.length; i++)
outQueue.offer((int)cdataStart[i]);
// Search for matching </div>, and before it add the end of CDATA marker
while (true) {
readAheadForSlashDiv();
if (isMatchFoundSlashDiv()) {
// Look back in the output queue for <div> and </div>s - make sure this is the right one
if (countDivs() == countSlashDivs()) {
// Add ]]>
byte[] cdataEnd = "]]>".getBytes();
for (int i = 0; i < cdataEnd.length; i++)
outQueue.offer((int)cdataEnd[i]);
outQueue.addAll(inQueue);
inQueue.clear();
break;
} else
outQueue.add(inQueue.remove());
} else {
outQueue.add(inQueue.remove());
}
}
} else
outQueue.add(inQueue.remove());
}
return outQueue.remove();
}
private boolean isMatchFoundSearchStart() {
Iterator<Integer> inIter = inQueue.iterator();
for (int i = 0; i < search.length; i++)
if (!inIter.hasNext() || search[i] != inIter.next())
return false;
return true;
}
private boolean isMatchFoundSlashDiv() {
Iterator<Integer> inIter = inQueue.iterator();
for (int i = 0; i < slashDiv.length; i++)
if (!inIter.hasNext() || slashDiv[i] != inIter.next())
return false;
return true;
}
private int countDivs() {
int numDivs = 0;
Iterator<Integer> outIter = outQueue.iterator();
while (outIter.hasNext()) {
if (outIter.next() == '<')
if (outIter.next() == 'd')
if (outIter.next() == 'i')
if (outIter.next() == 'v') {
numDivs++;
if (outIter.next() == '/' && outIter.next() == '>') //<div/> should have no effect
numDivs--;
}
}
return numDivs;
}
private int countSlashDivs() {
int numSlashDivs = 0;
Iterator<Integer> outIter = outQueue.iterator();
while (outIter.hasNext()) {
if (outIter.next() == '<')
if (outIter.next() == '/')
if (outIter.next() == 'd')
if (outIter.next() == 'i')
if (outIter.next() == 'v')
if (outIter.next() == '>')
numSlashDivs++;
}
return numSlashDivs;
}
private void readAheadForSearchStart() throws IOException {
// Work up some look-ahead.
while (inQueue.size() < search.length) {
int next = super.read();
inQueue.offer(next);
if (next == -1)
break;
}
}
private void readAheadForSlashDiv() throws IOException {
// Work up some look-ahead.
while (inQueue.size() < slashDiv.length) {
int next = super.read();
inQueue.offer(next);
if (next == -1)
break;
}
}
}
@Override
public InputStream decorate(IOContext ctxt, byte[] src, int offset, int length) throws IOException {
// TODO Auto-generated method stub
return null;
}
@Override
public Reader decorate(IOContext ctxt, Reader r) throws IOException {
// TODO Auto-generated method stub
return null;
}
}
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