com.fasterxml.jackson.dataformat.cbor.CBORReadContext Maven / Gradle / Ivy
package com.fasterxml.jackson.dataformat.cbor;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.io.CharTypes;
import com.fasterxml.jackson.core.io.ContentReference;
import com.fasterxml.jackson.core.json.DupDetector;
/**
* Replacement of {@link com.fasterxml.jackson.core.json.JsonReadContext}
* to support features needed by CBOR format.
*/
public final class CBORReadContext
extends JsonStreamContext
{
/**
* Parent context for this context; null for root context.
*/
protected final CBORReadContext _parent;
// // // Optional duplicate detection
protected final DupDetector _dups;
/**
* For fixed-size Arrays, Objects, this indicates expected number of entries.
*/
protected int _expEntryCount;
// // // Location information (minus source reference)
protected String _currentName;
/**
* @since 2.9
*/
protected Object _currentValue;
/*
/**********************************************************
/* Simple instance reuse slots
/**********************************************************
*/
protected CBORReadContext _child = null;
/*
/**********************************************************
/* Instance construction, reuse
/**********************************************************
*/
public CBORReadContext(CBORReadContext parent, DupDetector dups,
int type, int expEntryCount)
{
super();
_parent = parent;
_dups = dups;
_type = type;
_expEntryCount = expEntryCount;
_index = -1;
_nestingDepth = parent == null ? 0 : parent._nestingDepth + 1;
}
protected void reset(int type, int expEntryCount)
{
_type = type;
_expEntryCount = expEntryCount;
_index = -1;
_currentName = null;
_currentValue = null;
if (_dups != null) {
_dups.reset();
}
}
@Override
public Object getCurrentValue() {
return _currentValue;
}
@Override
public void setCurrentValue(Object v) {
_currentValue = v;
}
// // // Factory methods
public static CBORReadContext createRootContext(DupDetector dups) {
return new CBORReadContext(null, dups, TYPE_ROOT, -1);
}
public CBORReadContext createChildArrayContext(int expEntryCount)
{
CBORReadContext ctxt = _child;
if (ctxt == null) {
_child = ctxt = new CBORReadContext(this,
(_dups == null) ? null : _dups.child(),
TYPE_ARRAY, expEntryCount);
} else {
ctxt.reset(TYPE_ARRAY, expEntryCount);
}
return ctxt;
}
public CBORReadContext createChildObjectContext(int expEntryCount)
{
CBORReadContext ctxt = _child;
if (ctxt == null) {
_child = ctxt = new CBORReadContext(this,
(_dups == null) ? null : _dups.child(),
TYPE_OBJECT, expEntryCount);
return ctxt;
}
ctxt.reset(TYPE_OBJECT, expEntryCount);
return ctxt;
}
/*
/**********************************************************
/* Abstract method implementation
/**********************************************************
*/
@Override
public String getCurrentName() { return _currentName; }
@Override
public CBORReadContext getParent() { return _parent; }
/*
/**********************************************************
/* Extended API
/**********************************************************
*/
public boolean hasExpectedLength() { return (_expEntryCount >= 0); }
public int getExpectedLength() { return _expEntryCount; }
// @since 2.13
public int getRemainingExpectedLength() {
int diff = _expEntryCount - _index;
// Negative values would occur when expected count is -1
return Math.max(0, diff);
}
public boolean acceptsBreakMarker() {
return (_expEntryCount < 0) && _type != TYPE_ROOT;
}
/**
* Method called to increment the current entry count (Object property, Array
* element or Root value) for this context level
* and then see if more entries are accepted.
* The only case where more entries are NOT expected is for fixed-count
* Objects and Arrays that just reached the entry count.
*
* Note that since the entry count is updated this is a state-changing method.
*/
public boolean expectMoreValues() {
if (++_index == _expEntryCount) {
return false;
}
return true;
}
/**
* @return Location pointing to the point where the context
* start marker was found
*/
@Override
public JsonLocation startLocation(ContentReference srcRef) {
return new JsonLocation(srcRef, 1L, -1, -1);
}
@Override
@Deprecated // since 2.13
public JsonLocation getStartLocation(Object rawSrc) {
return startLocation(ContentReference.rawReference(rawSrc));
}
/*
/**********************************************************
/* State changes
/**********************************************************
*/
public void setCurrentName(String name) throws JsonProcessingException
{
_currentName = name;
if (_dups != null) {
_checkDup(_dups, name);
}
}
private void _checkDup(DupDetector dd, String name) throws JsonProcessingException
{
if (dd.isDup(name)) {
// 04-MAy-2016, tatu: Would be great to pass JsonParser, alas, not available so:
throw new JsonParseException(null,
"Duplicate field '"+name+"'", dd.findLocation());
}
}
/*
/**********************************************************
/* Overridden standard methods
/**********************************************************
*/
/**
* Overridden to provide developer readable "JsonPath" representation
* of the context.
*/
@Override
public String toString()
{
StringBuilder sb = new StringBuilder(64);
switch (_type) {
case TYPE_ROOT:
sb.append("/");
break;
case TYPE_ARRAY:
sb.append('[');
sb.append(getCurrentIndex());
sb.append(']');
break;
case TYPE_OBJECT:
sb.append('{');
if (_currentName != null) {
sb.append('"');
CharTypes.appendQuoted(sb, _currentName);
sb.append('"');
} else {
sb.append('?');
}
sb.append('}');
break;
}
return sb.toString();
}
}