com.couchbase.client.deps.com.fasterxml.jackson.core.json.DupDetector Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of core-io Show documentation
Show all versions of core-io Show documentation
The official Couchbase JVM Core IO Library
package com.couchbase.client.deps.com.fasterxml.jackson.core.json;
import java.util.*;
import com.couchbase.client.deps.com.fasterxml.jackson.core.*;
/**
* Helper class used if
* {@link com.couchbase.client.deps.com.fasterxml.jackson.core.JsonParser.Feature#STRICT_DUPLICATE_DETECTION}
* is enabled.
* Optimized to try to limit memory usage and processing overhead for smallest
* entries, but without adding trashing (immutable objects would achieve optimal
* memory usage but lead to significant number of discarded temp objects for
* scopes with large number of entries). Another consideration is trying to limit
* actual number of compiled classes as it contributes significantly to overall
* jar size (due to linkage etc).
*
* @since 2.3
*/
public class DupDetector
{
/**
* We need to store a back-reference here to parser/generator, unfortunately.
*/
protected final Object _source;
protected String _firstName;
protected String _secondName;
/**
* Lazily constructed set of names already seen within this context.
*/
protected HashSet _seen;
private DupDetector(Object src) {
_source = src;
}
public static DupDetector rootDetector(JsonParser p) {
return new DupDetector(p);
}
public static DupDetector rootDetector(JsonGenerator g) {
return new DupDetector(g);
}
public DupDetector child() {
return new DupDetector(_source);
}
public void reset() {
_firstName = null;
_secondName = null;
_seen = null;
}
public JsonLocation findLocation() {
// ugly but:
if (_source instanceof JsonParser) {
return ((JsonParser)_source).getCurrentLocation();
}
// do generators have a way to provide Location? Apparently not...
return null;
}
public boolean isDup(String name) throws JsonParseException
{
if (_firstName == null) {
_firstName = name;
return false;
}
if (name.equals(_firstName)) {
return true;
}
if (_secondName == null) {
_secondName = name;
return false;
}
if (name.equals(_secondName)) {
return true;
}
if (_seen == null) {
_seen = new HashSet(16); // 16 is default, seems reasonable
_seen.add(_firstName);
_seen.add(_secondName);
}
return !_seen.add(name);
}
}