com.fasterxml.jackson.databind.deser.impl.ManagedReferenceProperty Maven / Gradle / Ivy
package com.fasterxml.jackson.databind.deser.impl;
import java.io.IOException;
import java.util.Collection;
import java.util.Map;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.SettableBeanProperty;
/**
* Wrapper property that is used to handle managed (forward) properties
* Basically just needs to delegate first to actual forward property, and
* then to back property.
*/
public final class ManagedReferenceProperty
// Changed to extends delegating base class in 2.9
extends SettableBeanProperty.Delegating
{
private static final long serialVersionUID = 1L;
protected final String _referenceName;
/**
* Flag that indicates whether property to handle is a container type
* (array, Collection, Map) or not.
*/
protected final boolean _isContainer;
protected final SettableBeanProperty _backProperty;
public ManagedReferenceProperty(SettableBeanProperty forward, String refName,
SettableBeanProperty backward, boolean isContainer)
{
super(forward);
_referenceName = refName;
_backProperty = backward;
_isContainer = isContainer;
}
@Override
protected SettableBeanProperty withDelegate(SettableBeanProperty d) {
throw new IllegalStateException("Should never try to reset delegate");
}
// need to override to ensure both get fixed
@Override
public void fixAccess(DeserializationConfig config) {
delegate.fixAccess(config);
_backProperty.fixAccess(config);
}
/*
/**********************************************************
/* Overridden methods
/**********************************************************
*/
@Override
public void deserializeAndSet(JsonParser p, DeserializationContext ctxt, Object instance)
throws IOException {
set(instance, delegate.deserialize(p, ctxt));
}
@Override
public Object deserializeSetAndReturn(JsonParser p, DeserializationContext ctxt, Object instance)
throws IOException {
return setAndReturn(instance, deserialize(p, ctxt));
}
@Override
public final void set(Object instance, Object value) throws IOException {
setAndReturn(instance, value);
}
@Override
public Object setAndReturn(Object instance, Object value) throws IOException
{
/* 04-Feb-2014, tatu: As per [#390], it may be necessary to switch the
* ordering of forward/backward references, and start with back ref.
*/
if (value != null) {
if (_isContainer) { // ok, this gets ugly... but has to do for now
if (value instanceof Object[]) {
for (Object ob : (Object[]) value) {
if (ob != null) { _backProperty.set(ob, instance); }
}
} else if (value instanceof Collection) {
for (Object ob : (Collection) value) {
if (ob != null) { _backProperty.set(ob, instance); }
}
} else if (value instanceof Map) {
for (Object ob : ((Map) value).values()) {
if (ob != null) { _backProperty.set(ob, instance); }
}
} else {
throw new IllegalStateException("Unsupported container type ("+value.getClass().getName()
+") when resolving reference '"+_referenceName+"'");
}
} else {
_backProperty.set(value, instance);
}
}
// and then the forward reference itself
return delegate.setAndReturn(instance, value);
}
}