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General data-binding functionality for Jackson: works on core streaming API
package com.fasterxml.jackson.databind.jsontype;
import java.io.IOException;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
/**
* Interface for serializing type information regarding instances of specified
* base type (super class), so that exact subtype can be properly deserialized
* later on. These instances are to be called by regular
* {@link com.fasterxml.jackson.databind.JsonSerializer}s using proper contextual
* calls, to add type information using mechanism type serializer was
* configured with.
*/
public abstract class TypeSerializer
{
/*
/**********************************************************
/* Initialization
/**********************************************************
*/
/**
* Method called to create contextual version, to be used for
* values of given property. This may be the type itself
* (as is the case for bean properties), or values contained
* (for {@link java.util.Collection} or {@link java.util.Map}
* valued properties).
*
* @since 2.0
*/
public abstract TypeSerializer forProperty(BeanProperty prop);
/*
/**********************************************************
/* Introspection
/**********************************************************
*/
/**
* Accessor for type information inclusion method
* that serializer uses; indicates how type information
* is embedded in resulting JSON.
*/
public abstract JsonTypeInfo.As getTypeInclusion();
/**
* Name of property that contains type information, if
* property-based inclusion is used.
*/
public abstract String getPropertyName();
/**
* Accessor for object that handles conversions between
* types and matching type ids.
*/
public abstract TypeIdResolver getTypeIdResolver();
/*
/**********************************************************
/* Type serialization methods
/**********************************************************
*/
/**
* Method called to write initial part of type information for given
* value, when it will be output as scalar JSON value (not as JSON
* Object or Array).
* This means that the context after call can not be that of JSON Object;
* it may be Array or root context.
*
* @param value Value that will be serialized, for which type information is
* to be written
* @param g Generator to use for writing type information
*/
public abstract void writeTypePrefixForScalar(Object value, JsonGenerator g) throws IOException;
/**
* Method called to write initial part of type information for given
* value, when it will be output as JSON Object value (not as JSON
* Array or scalar).
* This means that context after call must be JSON Object, meaning that
* caller can then proceed to output field entries.
*
* @param value Value that will be serialized, for which type information is
* to be written
* @param g Generator to use for writing type information
*/
public abstract void writeTypePrefixForObject(Object value, JsonGenerator g) throws IOException;
/**
* Method called to write initial part of type information for given
* value, when it will be output as JSON Array value (not as JSON
* Object or scalar).
* This means that context after call must be JSON Array, that is, there
* must be an open START_ARRAY to write contents in.
*
* @param value Value that will be serialized, for which type information is
* to be written
* @param g Generator to use for writing type information
*/
public abstract void writeTypePrefixForArray(Object value, JsonGenerator g) throws IOException;
/**
* Method called after value has been serialized, to close any scopes opened
* by earlier matching call to {@link #writeTypePrefixForScalar}.
* Actual action to take may depend on various factors, but has to match with
* action {@link #writeTypePrefixForScalar} did (close array or object; or do nothing).
*/
public abstract void writeTypeSuffixForScalar(Object value, JsonGenerator g) throws IOException;
/**
* Method called after value has been serialized, to close any scopes opened
* by earlier matching call to {@link #writeTypePrefixForObject}.
* It needs to write closing END_OBJECT marker, and any other decoration
* that needs to be matched.
*/
public abstract void writeTypeSuffixForObject(Object value, JsonGenerator g) throws IOException;
/**
* Method called after value has been serialized, to close any scopes opened
* by earlier matching call to {@link #writeTypeSuffixForScalar}.
* It needs to write closing END_ARRAY marker, and any other decoration
* that needs to be matched.
*/
public abstract void writeTypeSuffixForArray(Object value, JsonGenerator g) throws IOException;
/**
* Alternative version of the prefix-for-scalar method, which is given
* actual type to use (instead of using exact type of the value); typically
* a super type of actual value type
*/
public void writeTypePrefixForScalar(Object value, JsonGenerator g, Class type) throws IOException {
writeTypePrefixForScalar(value, g);
}
/**
* Alternative version of the prefix-for-object method, which is given
* actual type to use (instead of using exact type of the value); typically
* a super type of actual value type
*/
public void writeTypePrefixForObject(Object value, JsonGenerator g, Class type) throws IOException {
writeTypePrefixForObject(value, g);
}
/**
* Alternative version of the prefix-for-array method, which is given
* actual type to use (instead of using exact type of the value); typically
* a super type of actual value type
*/
public void writeTypePrefixForArray(Object value, JsonGenerator g, Class type) throws IOException {
writeTypePrefixForArray(value, g);
}
/*
/**********************************************************
/* Type serialization methods with type id override
/**********************************************************
*/
/**
* Method called to write initial part of type information for given
* value, when it will be output as scalar JSON value (not as JSON
* Object or Array),
* using specified custom type id instead of calling {@link TypeIdResolver}.
* This means that the context after call can not be that of JSON Object;
* it may be Array or root context.
*
* @param value Value that will be serialized, for which type information is
* to be written
* @param g Generator to use for writing type information
* @param typeId Exact type id to use
*/
public abstract void writeCustomTypePrefixForScalar(Object value, JsonGenerator g, String typeId) throws IOException;
/**
* Method called to write initial part of type information for given
* value, when it will be output as JSON Object value (not as JSON
* Array or scalar),
* using specified custom type id instead of calling {@link TypeIdResolver}.
* This means that context after call must be JSON Object, meaning that
* caller can then proceed to output field entries.
*
* @param value Value that will be serialized, for which type information is
* to be written
* @param g Generator to use for writing type information
* @param typeId Exact type id to use
*/
public abstract void writeCustomTypePrefixForObject(Object value, JsonGenerator g, String typeId) throws IOException;
public abstract void writeCustomTypePrefixForArray(Object value, JsonGenerator g, String typeId) throws IOException;
public abstract void writeCustomTypeSuffixForScalar(Object value, JsonGenerator g, String typeId) throws IOException;
public abstract void writeCustomTypeSuffixForObject(Object value, JsonGenerator g, String typeId) throws IOException;
public abstract void writeCustomTypeSuffixForArray(Object value, JsonGenerator g, String typeId) throws IOException;
}