@Override
public JsonToken nextToken() throws IOException {
// Anything buffered?
TokenFilterContext ctxt = _exposedContext;
if (ctxt != null) {
while (true) {
JsonToken t = ctxt.nextTokenToRead();
if (t != null) {
_currToken = t;
return t;
}
// all done with buffered stuff?
if (ctxt == _headContext) {
_exposedContext = null;
if (ctxt.inArray()) {
t = delegate.getCurrentToken();
// Is this guaranteed to work without further checks?
// if (t != JsonToken.START_ARRAY) {
_currToken = t;
return t;
}
// Almost! Most likely still have the current token;
// with the sole exception of
/*
t = delegate.getCurrentToken();
if (t != JsonToken.FIELD_NAME) {
_currToken = t;
return t;
}
*/
break;
}
// If not, traverse down the context chain
ctxt = _headContext.findChildOf(ctxt);
_exposedContext = ctxt;
if (ctxt == null) { // should never occur
throw _constructError("Unexpected problem: chain of filtered context broken");
}
}
}
// If not, need to read more. If we got any:
JsonToken t = delegate.nextToken();
if (t == null) {
// no strict need to close, since we have no state here
return (_currToken = t);
}
// otherwise... to include or not?
TokenFilter f;
switch (t.id()) {
case ID_START_ARRAY:
f = _itemFilter;
if (f == TokenFilter.INCLUDE_ALL) {
_headContext = _headContext.createChildArrayContext(f, true);
return (_currToken = t);
}
if (f == null) { // does this occur?
delegate.skipChildren();
break;
}
// Otherwise still iffy, need to check
f = _headContext.checkValue(f);
if (f == null) {
delegate.skipChildren();
break;
}
if (f != TokenFilter.INCLUDE_ALL) {
f = f.filterStartArray();
}
_itemFilter = f;
if (f == TokenFilter.INCLUDE_ALL) {
_headContext = _headContext.createChildArrayContext(f, true);
return (_currToken = t);
}
_headContext = _headContext.createChildArrayContext(f, false);
// Also: only need buffering if parent path to be included
if (_includePath) {
t = _nextTokenWithBuffering(_headContext);
if (t != null) {
_currToken = t;
return t;
}
}
break;
case ID_START_OBJECT:
f = _itemFilter;
if (f == TokenFilter.INCLUDE_ALL) {
_headContext = _headContext.createChildObjectContext(f, true);
return (_currToken = t);
}
if (f == null) { // does this occur?
delegate.skipChildren();
break;
}
// Otherwise still iffy, need to check
f = _headContext.checkValue(f);
if (f == null) {
delegate.skipChildren();
break;
}
if (f != TokenFilter.INCLUDE_ALL) {
f = f.filterStartObject();
}
_itemFilter = f;
if (f == TokenFilter.INCLUDE_ALL) {
_headContext = _headContext.createChildObjectContext(f, true);
return (_currToken = t);
}
_headContext = _headContext.createChildObjectContext(f, false);
// Also: only need buffering if parent path to be included
if (_includePath) {
t = _nextTokenWithBuffering(_headContext);
if (t != null) {
_currToken = t;
return t;
}
}
// note: inclusion of surrounding Object handled separately via
// FIELD_NAME
break;
case ID_END_ARRAY:
case ID_END_OBJECT:
{
boolean returnEnd = _headContext.isStartHandled();
f = _headContext.getFilter();
if ((f != null) && (f != TokenFilter.INCLUDE_ALL)) {
f.filterFinishArray();
}
_headContext = _headContext.getParent();
_itemFilter = _headContext.getFilter();
if (returnEnd) {
return (_currToken = t);
}
}
break;
case ID_FIELD_NAME:
{
final String name = delegate.getCurrentName();
// note: this will also set 'needToHandleName'
f = _headContext.setFieldName(name);
if (f == TokenFilter.INCLUDE_ALL) {
_itemFilter = f;
if (!_includePath) {
// Minor twist here: if parent NOT included, may need to induce output of
// surrounding START_OBJECT/END_OBJECT
if (_includeImmediateParent && !_headContext.isStartHandled()) {
t =
_headContext
.nextTokenToRead(); // returns START_OBJECT but also marks it handled
_exposedContext = _headContext;
}
}
return (_currToken = t);
}
if (f == null) {
delegate.nextToken();
delegate.skipChildren();
break;
}
f = f.includeProperty(name);
if (f == null) {
delegate.nextToken();
delegate.skipChildren();
break;
}
_itemFilter = f;
if (f == TokenFilter.INCLUDE_ALL) {
if (_includePath) {
return (_currToken = t);
}
}
if (_includePath) {
t = _nextTokenWithBuffering(_headContext);
if (t != null) {
_currToken = t;
return t;
}
}
break;
}
default: // scalar value
f = _itemFilter;
if (f == TokenFilter.INCLUDE_ALL) {
return (_currToken = t);
}
if (f != null) {
f = _headContext.checkValue(f);
if ((f == TokenFilter.INCLUDE_ALL) || ((f != null) && f.includeValue(delegate))) {
return (_currToken = t);
}
}
// Otherwise not included (leaves must be explicitly included)
break;
}
// We get here if token was not yet found; offlined handling
return _nextToken2();
}
