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com.fasterxml.jackson.databind.MappingIterator Maven / Gradle / Ivy
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package com.fasterxml.jackson.databind;
import java.io.Closeable;
import java.io.IOException;
import java.util.*;
import com.fasterxml.jackson.core.*;
/**
* Iterator exposed by {@link ObjectMapper} when binding sequence of
* objects. Extension is done to allow more convenient exposing of
* {@link IOException} (which basic {@link Iterator} does not expose)
*/
public class MappingIterator implements Iterator, Closeable
{
protected final static MappingIterator EMPTY_ITERATOR =
new MappingIterator(null, null, null, null, false, null);
protected final JavaType _type;
protected final DeserializationContext _context;
protected final JsonDeserializer _deserializer;
protected JsonParser _parser;
/**
* Flag that indicates whether input {@link JsonParser} should be closed
* when we are done or not; generally only called when caller did not
* pass JsonParser.
*/
protected final boolean _closeParser;
/**
* Flag that is set when we have determined what {@link #hasNextValue()}
* should value; reset when {@link #nextValue} is called
*/
protected boolean _hasNextChecked;
/**
* If not null, "value to update" instead of creating a new instance
* for each call.
*/
protected final T _updatedValue;
/**
* @deprecated Since 2.1, to be removed
*/
@Deprecated
protected MappingIterator(JavaType type, JsonParser jp, DeserializationContext ctxt,
JsonDeserializer deser)
{
this(type, jp, ctxt, deser, true, null);
}
/**
* @param managedParser Whether we "own" the {@link JsonParser} passed or not:
* if true, it was created by {@link ObjectReader} and code here needs to
* close it; if false, it was passed by calling code and should not be
* closed by iterator.
*/
@SuppressWarnings("unchecked")
protected MappingIterator(JavaType type, JsonParser jp, DeserializationContext ctxt,
JsonDeserializer deser,
boolean managedParser, Object valueToUpdate)
{
_type = type;
_parser = jp;
_context = ctxt;
_deserializer = (JsonDeserializer) deser;
_closeParser = managedParser;
if (valueToUpdate == null) {
_updatedValue = null;
} else {
_updatedValue = (T) valueToUpdate;
}
/* Ok: one more thing; we may have to skip START_ARRAY, assuming
* "wrapped" sequence; but this is ONLY done for 'managed' parsers
* and never if JsonParser was directly passed by caller (if it
* was, caller must have either positioned it over first token of
* the first element, or cleared the START_ARRAY token explicitly).
* Note, however, that we do not try to guess whether this could be
* an unwrapped sequence of arrays/Lists: we just assume it is wrapped;
* and if not, caller needs to hand us JsonParser instead, pointing to
* the first token of the first element.
*/
if (managedParser && jp != null && jp.getCurrentToken() == JsonToken.START_ARRAY) {
jp.clearCurrentToken();
}
}
@SuppressWarnings("unchecked")
protected static MappingIterator emptyIterator() {
return (MappingIterator) EMPTY_ITERATOR;
}
/*
/**********************************************************
/* Basic iterator impl
/**********************************************************
*/
@Override
public boolean hasNext()
{
try {
return hasNextValue();
} catch (JsonMappingException e) {
throw new RuntimeJsonMappingException(e.getMessage(), e);
} catch (IOException e) {
throw new RuntimeException(e.getMessage(), e);
}
}
@Override
public T next()
{
try {
return nextValue();
} catch (JsonMappingException e) {
throw new RuntimeJsonMappingException(e.getMessage(), e);
} catch (IOException e) {
throw new RuntimeException(e.getMessage(), e);
}
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
@Override
public void close() throws IOException{
if(_parser != null) {
_parser.close();
}
}
/*
/**********************************************************
/* Extended API, iteration
/**********************************************************
*/
/**
* Equivalent of {@link #next} but one that may throw checked
* exceptions from Jackson due to invalid input.
*/
public boolean hasNextValue() throws IOException
{
if (_parser == null) {
return false;
}
if (!_hasNextChecked) {
JsonToken t = _parser.getCurrentToken();
_hasNextChecked = true;
if (t == null) { // un-initialized or cleared; find next
t = _parser.nextToken();
// If EOF, no more, or if we hit END_ARRAY (although we don't clear the token).
if (t == null || t == JsonToken.END_ARRAY) {
JsonParser jp = _parser;
_parser = null;
if (_closeParser) {
jp.close();
}
return false;
}
}
}
return true;
}
public T nextValue() throws IOException
{
// caller should always call 'hasNext[Value]' first; but let's ensure:
if (!_hasNextChecked) {
if (!hasNextValue()) {
throw new NoSuchElementException();
}
}
if (_parser == null) {
throw new NoSuchElementException();
}
_hasNextChecked = false;
T result;
if (_updatedValue == null) {
result = _deserializer.deserialize(_parser, _context);
} else{
_deserializer.deserialize(_parser, _context, _updatedValue);
result = _updatedValue;
}
// Need to consume the token too
_parser.clearCurrentToken();
return result;
}
/**
* Convenience method for reading all entries accessible via
* this iterator
*
* @return List of entries read
*
* @since 2.2
*/
public List readAll() throws IOException {
return readAll(new ArrayList());
}
/**
* Convenience method for reading all entries accessible via
* this iterator
*
* @return List of entries read (same as passed-in argument)
*
* @since 2.2
*/
public List readAll(List resultList) throws IOException
{
while (hasNextValue()) {
resultList.add(nextValue());
}
return resultList;
}
/*
/**********************************************************
/* Extended API, accessors
/**********************************************************
*/
/**
* Accessor for getting underlying parser this iterator uses.
*
* @since 2.2
*/
public JsonParser getParser() {
return _parser;
}
/**
* Accessor for accessing {@link FormatSchema} that the underlying parser
* (as per {@link #getParser}) is using, if any; only parser of schema-aware
* formats use schemas.
*
* @since 2.2
*/
public FormatSchema getParserSchema() {
return _parser.getSchema();
}
/**
* Convenience method, functionally equivalent to:
*
* iterator.getParser().getCurrentLocation()
*
*
* @return Location of the input stream of the underlying parser
*
* @since 2.2.1
*/
public JsonLocation getCurrentLocation() {
return _parser.getCurrentLocation();
}
}
