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package com.sun.jersey.api.json;
import java.io.IOException;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.JsonProcessingException;
import org.codehaus.jackson.map.JsonSerializableWithType;
import org.codehaus.jackson.map.SerializerProvider;
import org.codehaus.jackson.map.TypeSerializer;
/**
* An entity supporting JSON with Padding (JSONP).
*
* If an instance is returned by a resource method and the most acceptable
* media type is one of application/javascript, application/x-javascript,
* text/ecmascript, application/ecmascript or text/jscript then the object
* that is contained by the instance is serialized as JSON (if supported, using
* the application/json media type) and the result is wrapped around a
* JavaScript callback function, whose name by default is "callback". Otherwise,
* the object is serialized directly according to the most acceptable media type.
* This means that an instance can be used to produce the media types
* application/json, application/xml in addition to application/x-javascript.
*
* @author [email protected]
*/
public class JSONWithPadding implements JsonSerializableWithType {
public static final String DEFAULT_CALLBACK_NAME = "callback";
private final String callbackName;
private final Object jsonSource;
/**
* Pad JSON using the default function name "callback".
*
* @param jsonSource the JSON to pad.
*/
public JSONWithPadding(Object jsonSource) {
this(jsonSource, DEFAULT_CALLBACK_NAME);
}
/**
* Pad JSON using a declared callback function name.
*
* @param jsonSource the JSON to pad.
* @param callbackName the callback function name.
*/
public JSONWithPadding(Object jsonSource, String callbackName) {
if (jsonSource == null)
throw new IllegalArgumentException("JSON source MUST not be null");
this.jsonSource = jsonSource;
this.callbackName = (callbackName == null) ? DEFAULT_CALLBACK_NAME : callbackName;
}
/**
* Get the callback function name.
*
* @return the callback function name.
*/
public String getCallbackName() {
return callbackName;
}
/**
* Get the JSON source.
*
* @return the JSON source.
*/
public Object getJsonSource() {
return jsonSource;
}
@Override
public void serialize(JsonGenerator jgen, SerializerProvider provider)
throws IOException, JsonProcessingException {
if (jsonSource == null) {
provider.getNullValueSerializer().serialize(null, jgen, provider);
} else {
Class cls = jsonSource.getClass();
provider.findTypedValueSerializer(cls, true).serialize(jsonSource, jgen, provider);
}
}
@Override
public void serializeWithType(JsonGenerator jgen, SerializerProvider provider, TypeSerializer typeSer) throws IOException, JsonProcessingException {
serialize(jgen, provider);
}
}