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43 package org.apidesign.html.json.spi;
45 import java.io.IOException;
46 import java.io.InputStream;
48 /** A {@link ContextBuilder service provider interface} responsible for
49 * conversion of JSON objects to Java ones and vice-versa.
51 * @author Jaroslav Tulach <jtulach@netbeans.org>
53 public interface Transfer {
55 * Called to inspect properties of an object (usually a JSON or JavaScript
58 * @param obj the object to inspect
59 * @param props the names of properties to check on the object
61 * @param values array of the same length as <code>props</code> should be
62 * filled by values of properties on the <code>obj</code>. If a property is
63 * not defined, a <code>null</code> value should be stored in the array
65 public void extract(Object obj, String[] props, Object[] values);
67 /** Reads content of a stream and creates its JSON representation.
68 * The returned object is implementation dependant. It however needs
69 * to be acceptable as first argument of {@link #extract(java.lang.Object, java.lang.String[], java.lang.Object[]) extract}
72 * @param is input stream to read data from
73 * @return an object representing the JSON data
74 * @throws IOException if something goes wrong
76 public Object toJSON(InputStream is) throws IOException;
78 /** Starts the JSON or JSONP query.
80 * @param call description of the call to make
82 public void loadJSON(JSONCall call);