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package com.fasterxml.jackson.databind.deser.std;
import java.io.IOException;
import com.fasterxml.jackson.core.JsonLocation;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.util.TokenBuffer;
/**
* Container class for core Jackson type deserializers.
*/
public class JacksonDeserializers
{
public static StdDeserializer<?>[] all()
{
return new StdDeserializer[] {
new JavaTypeDeserializer(),
// new JsonLocationDeserializer(),
new TokenBufferDeserializer(),
};
}
/*
/**********************************************************
/* Deserializer implementations
/**********************************************************
*/
/**
* Deserializer for {@link JavaType} values.
*/
public static class JavaTypeDeserializer
extends StdScalarDeserializer<JavaType>
{
public JavaTypeDeserializer() { super(JavaType.class); }
@Override
public JavaType deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonToken curr = jp.getCurrentToken();
// Usually should just get string value:
if (curr == JsonToken.VALUE_STRING) {
String str = jp.getText().trim();
if (str.length() == 0) {
return getEmptyValue();
}
return ctxt.getTypeFactory().constructFromCanonical(str);
}
// or occasionally just embedded object maybe
if (curr == JsonToken.VALUE_EMBEDDED_OBJECT) {
return (JavaType) jp.getEmbeddedObject();
}
throw ctxt.mappingException(_valueClass);
}
}
@JacksonStdImpl
public static class JsonLocationDeserializer
extends StdScalarDeserializer<JsonLocation>
{
public JsonLocationDeserializer() { super(JsonLocation.class); }
@Override
public JsonLocation deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
// !!! TBI
return null;
}
}
/**
* We also want to directly support deserialization of {@link TokenBuffer}.
*<p>
* Note that we use scalar deserializer base just because we claim
* to be of scalar for type information inclusion purposes; actual
* underlying content can be of any (Object, Array, scalar) type.
*/
@JacksonStdImpl
public static class TokenBufferDeserializer
extends StdScalarDeserializer<TokenBuffer>
{
public TokenBufferDeserializer() { super(TokenBuffer.class); }
@Override
public TokenBuffer deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
TokenBuffer tb = new TokenBuffer(jp.getCodec());
// quite simple, given that TokenBuffer is a JsonGenerator:
tb.copyCurrentStructure(jp);
return tb;
}
}
}
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