com.groupbyinc.common.jackson.databind.deser.impl.NullsConstantProvider Maven / Gradle / Ivy
package com.fasterxml.jackson.databind.deser.impl;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.NullValueProvider;
import com.fasterxml.jackson.databind.exc.InvalidNullException;
import com.fasterxml.jackson.databind.util.AccessPattern;
/**
* Simple {@link NullValueProvider} that will always throw a
* {@link InvalidNullException} when a null is encountered.
*/
public class NullsConstantProvider
implements NullValueProvider, java.io.Serializable
{
private static final long serialVersionUID = 1L;
private final static NullsConstantProvider SKIPPER = new NullsConstantProvider(null);
private final static NullsConstantProvider NULLER = new NullsConstantProvider(null);
protected final Object _nullValue;
protected final AccessPattern _access;
protected NullsConstantProvider(Object nvl) {
_nullValue = nvl;
_access = (_nullValue == null) ? AccessPattern.ALWAYS_NULL
: AccessPattern.CONSTANT;
}
/**
* Static accessor for a stateless instance used as marker, to indicate
* that all input `null` values should be skipped (ignored), so that
* no corresponding property value is set (with POJOs), and no content
* values (array/Collection elements, Map entries) are added.
*/
public static NullsConstantProvider skipper() {
return SKIPPER;
}
public static NullsConstantProvider nuller() {
return NULLER;
}
public static NullsConstantProvider forValue(Object nvl) {
if (nvl == null) {
return NULLER;
}
return new NullsConstantProvider(nvl);
}
/**
* Utility method that can be used to check if given null value provider
* is "skipper", marker provider that means that all input `null`s should
* be skipped (ignored), instead of converted
*/
public static boolean isSkipper(NullValueProvider p) {
return (p == SKIPPER);
}
/**
* Utility method that can be used to check if given null value provider
* is "nuller", no-operation provider that will always simply return
* Java `null` for any and all input `null`s.
*/
public static boolean isNuller(NullValueProvider p) {
return (p == NULLER);
}
@Override
public AccessPattern getNullAccessPattern() {
return _access;
}
@Override
public Object getNullValue(DeserializationContext ctxt) {
return _nullValue;
}
}