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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); } }





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