gson/docs/javadocs/com/google/gson/annotations/JsonAdapter.html


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JsonAdapter (Gson 2.3.1 API)
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com.google.gson.annotations</FONT>
<BR>
Annotation Type JsonAdapter</H2>
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<DL>
<DT><PRE><FONT SIZE="-1"><A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/annotation/Retention.html?is-external=true" title="class or interface in java.lang.annotation">@Retention</A>(<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/annotation/Retention.html?is-external=true#value()" title="class or interface in java.lang.annotation">value</A>=<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/annotation/RetentionPolicy.html?is-external=true#RUNTIME" title="class or interface in java.lang.annotation">RUNTIME</A>)
<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/annotation/Target.html?is-external=true" title="class or interface in java.lang.annotation">@Target</A>(<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/annotation/Target.html?is-external=true#value()" title="class or interface in java.lang.annotation">value</A>={<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/annotation/ElementType.html?is-external=true#TYPE" title="class or interface in java.lang.annotation">TYPE</A>,<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/annotation/ElementType.html?is-external=true#FIELD" title="class or interface in java.lang.annotation">FIELD</A>})
</FONT>public @interface <B>JsonAdapter</B></DL>
</PRE>

<P>
An annotation that indicates the Gson <A HREF="../../../../com/google/gson/TypeAdapter.html" title="class in com.google.gson"><CODE>TypeAdapter</CODE></A> to use with a class
 or field.

 <p>Here is an example of how this annotation is used:</p>
 <pre>
 &#64JsonAdapter(UserJsonAdapter.class)
 public class User {
   public final String firstName, lastName;
   private User(String firstName, String lastName) {
     this.firstName = firstName;
     this.lastName = lastName;
   }
 }
 public class UserJsonAdapter extends TypeAdapter&lt;User&gt; {
   &#64Override public void write(JsonWriter out, User user) throws IOException {
     // implement write: combine firstName and lastName into name
     out.beginObject();
     out.name("name");
     out.value(user.firstName + " " + user.lastName);
     out.endObject();
     // implement the write method
   }
   &#64Override public User read(JsonReader in) throws IOException {
     // implement read: split name into firstName and lastName
     in.beginObject();
     in.nextName();
     String[] nameParts = in.nextString().split(" ");
     in.endObject();
     return new User(nameParts[0], nameParts[1]);
   }
 }
 </pre>

 Since User class specified UserJsonAdapter.class in &#64JsonAdapter annotation, it
 will automatically be invoked to serialize/deserialize User instances. <br>

 <p> Here is an example of how to apply this annotation to a field.
 <pre>
 private static final class Gadget {
   &#64JsonAdapter(UserJsonAdapter2.class)
   final User user;
   Gadget(User user) {
     this.user = user;
   }
 }
 </pre>

 It's possible to specify different type adapters on a field, that
 field's type, and in the <A HREF="../../../../com/google/gson/GsonBuilder.html" title="class in com.google.gson"><CODE>GsonBuilder</CODE></A>. Field
 annotations take precedence over <code>GsonBuilder</code>-registered type
 adapters, which in turn take precedence over annotated types.

 <p>The class referenced by this annotation must be either a <A HREF="../../../../com/google/gson/TypeAdapter.html" title="class in com.google.gson"><CODE>TypeAdapter</CODE></A> or a <A HREF="../../../../com/google/gson/TypeAdapterFactory.html" title="interface in com.google.gson"><CODE>TypeAdapterFactory</CODE></A>. Using the factory interface
 makes it possible to delegate to the enclosing <code>Gson</code> instance.
<P>

<P>
<DL>
<DT><B>Since:</B></DT>
  <DD>2.3</DD>
<DT><B>Author:</B></DT>
  <DD>Inderjeet Singh, Joel Leitch, Jesse Wilson</DD>
</DL>
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<!-- =========== ANNOTATION TYPE REQUIRED MEMBER SUMMARY =========== -->

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<CODE>&nbsp;<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;?&gt;</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/gson/annotations/JsonAdapter.html#value()">value</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Either a <A HREF="../../../../com/google/gson/TypeAdapter.html" title="class in com.google.gson"><CODE>TypeAdapter</CODE></A> or <A HREF="../../../../com/google/gson/TypeAdapterFactory.html" title="interface in com.google.gson"><CODE>TypeAdapterFactory</CODE></A>.</TD>
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<A NAME="value()"><!-- --></A><H3>
value</H3>
<PRE>
public abstract <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;?&gt; <B>value</B></PRE>
<DL>
<DD>Either a <A HREF="../../../../com/google/gson/TypeAdapter.html" title="class in com.google.gson"><CODE>TypeAdapter</CODE></A> or <A HREF="../../../../com/google/gson/TypeAdapterFactory.html" title="interface in com.google.gson"><CODE>TypeAdapterFactory</CODE></A>.
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