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/*
* Copyright 2013 Jesse Morgan
*/
package com.p4square.grow.provider;
import java.io.IOException;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
/**
* Provider provides a simple interface for loading and persisting
* objects.
*
* @author Jesse Morgan <jesse@jesterpm.net>
*/
public abstract class JsonEncodedProvider<V> {
public static final ObjectMapper MAPPER = new ObjectMapper();
static {
MAPPER.configure(SerializationFeature.WRITE_ENUMS_USING_TO_STRING, true);
MAPPER.configure(DeserializationFeature.READ_ENUMS_USING_TO_STRING, true);
MAPPER.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
}
protected final Class<V> mClazz;
protected final JavaType mType;
public JsonEncodedProvider(Class<V> clazz) {
mClazz = clazz;
mType = null;
}
public JsonEncodedProvider(JavaType type) {
mType = type;
mClazz = null;
}
/**
* Encode the object as JSON.
*
* @param obj The object to encode.
* @return The JSON encoding of obj.
* @throws IOException if the object cannot be encoded.
*/
protected String encode(V obj) throws IOException {
if (mClazz == String.class) {
return (String) obj;
}
return MAPPER.writeValueAsString(obj);
}
/**
* Decode the JSON string as an object.
*
* @param blob The JSON data to decode.
* @return The decoded object or null if blob is null.
* @throws IOException If an object cannot be decoded.
*/
protected V decode(String blob) throws IOException {
if (blob == null) {
return null;
}
if (mClazz == String.class) {
return (V) blob;
}
V obj;
if (mClazz != null) {
obj = MAPPER.readValue(blob, mClazz);
} else {
obj = MAPPER.readValue(blob, mType);
}
return obj;
}
}
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