com.fasterxml.jackson.databind.node.POJONode Maven / Gradle / Ivy
package com.fasterxml.jackson.databind.node;
import java.io.IOException;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.JsonSerializable;
import com.fasterxml.jackson.databind.SerializerProvider;
/**
* Value node that contains a wrapped POJO, to be serialized as
* a JSON constructed through data mapping (usually done by
* calling {@link com.fasterxml.jackson.databind.ObjectMapper}).
*/
public class POJONode
extends ValueNode
{
private static final long serialVersionUID = 2L;
protected final Object _value;
public POJONode(Object v) { _value = v; }
/*
/**********************************************************
/* Base class overrides
/**********************************************************
*/
@Override
public JsonNodeType getNodeType() {
return JsonNodeType.POJO;
}
@Override public JsonToken asToken() { return JsonToken.VALUE_EMBEDDED_OBJECT; }
/**
* As it is possible that some implementations embed byte[] as POJONode
* (despite optimal being {@link BinaryNode}), let's add support for exposing
* binary data here too.
*/
@Override
public byte[] binaryValue() throws IOException
{
if (_value instanceof byte[]) {
return (byte[]) _value;
}
return super.binaryValue();
}
/*
/**********************************************************
/* General type coercions
/**********************************************************
*/
@Override
public String asText() { return (_value == null) ? "null" : _value.toString(); }
@Override public String asText(String defaultValue) {
return (_value == null) ? defaultValue : _value.toString();
}
@Override
public boolean asBoolean(boolean defaultValue)
{
if (_value != null && _value instanceof Boolean) {
return ((Boolean) _value).booleanValue();
}
return defaultValue;
}
@Override
public int asInt(int defaultValue)
{
if (_value instanceof Number) {
return ((Number) _value).intValue();
}
return defaultValue;
}
@Override
public long asLong(long defaultValue)
{
if (_value instanceof Number) {
return ((Number) _value).longValue();
}
return defaultValue;
}
@Override
public double asDouble(double defaultValue)
{
if (_value instanceof Number) {
return ((Number) _value).doubleValue();
}
return defaultValue;
}
/*
/**********************************************************
/* Public API, serialization
/**********************************************************
*/
@Override
public final void serialize(JsonGenerator gen, SerializerProvider ctxt) throws IOException
{
if (_value == null) {
ctxt.defaultSerializeNull(gen);
} else if (_value instanceof JsonSerializable) {
((JsonSerializable) _value).serialize(gen, ctxt);
} else {
// 25-May-2018, tatu: [databind#1991] do not call via generator but through context;
// this to preserve contextual information
ctxt.defaultSerializeValue(_value, gen);
}
}
/*
/**********************************************************
/* Extended API
/**********************************************************
*/
/**
* Method that can be used to access the POJO this node wraps.
*/
public Object getPojo() { return _value; }
/*
/**********************************************************
/* Overridden standard methods
/**********************************************************
*/
@Override
public boolean equals(Object o)
{
if (o == this) return true;
if (o == null) return false;
if (o instanceof POJONode) {
return _pojoEquals((POJONode) o);
}
return false;
}
/**
* @since 2.3
*/
protected boolean _pojoEquals(POJONode other)
{
if (_value == null) {
return other._value == null;
}
return _value.equals(other._value);
}
@Override
public int hashCode() { return _value.hashCode(); }
}