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Expose (Gson 1.2 API)
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com.google.gson.annotations</FONT>
<BR>
Annotation Type Expose</H2>
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<DL>
<DT><PRE><FONT SIZE="-1"><A HREF="http://java.sun.com/j2se/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://java.sun.com/j2se/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://java.sun.com/j2se/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://java.sun.com/j2se/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://java.sun.com/j2se/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://java.sun.com/j2se/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>Expose</B></DL>
</PRE>
<P>
An annotation that indicates this member should be exposed for JSON
serialization or deserialization.
<p>This annotation has no effect unless you build <A HREF="../../../../com/google/gson/Gson.html" title="class in com.google.gson"><CODE>Gson</CODE></A>
with a <A HREF="../../../../com/google/gson/GsonBuilder.html" title="class in com.google.gson"><CODE>GsonBuilder</CODE></A> and invoke
<A HREF="../../../../com/google/gson/GsonBuilder.html#excludeFieldsWithoutExposeAnnotation()"><CODE>GsonBuilder.excludeFieldsWithoutExposeAnnotation()</CODE></A>
method.</p>
<p>Here is an example of how this annotation is meant to be used:
<p><pre>
public class User {
&#64Expose private String firstName;
&#64Expose private String lastName;
&#64Expose private String emailAddress;
private String password;
}
</pre></p>
If you created Gson with <code>new Gson()</code>, the <code>toJson()</code> and <code>fromJson()</code>
methods will use the <code>password</code> field along-with <code>firstName</code>, <code>lastName</code>,
and <code>emailAddress</code> for serialization and deserialization. However, if you created Gson
with <code>Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create()</code>
then the <code>toJson()</code> and <code>fromJson()</code> methods of Gson will exclude the
<code>password</code> field. This is because the <code>password</code> field is not marked with the
<code>@Expose</code> annotation.
<p>Note that another way to achieve the same effect would have been to just mark the
<code>password</code> field as <code>transient</code>, and Gson would have excluded it even with default
settings. The <code>@Expose</code> annotation is useful in a style of programming where you want to
explicitly specify all fields that should get considered for serialization or deserialization.
<P>
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<DL>
<DT><B>Author:</B></DT>
<DD>Inderjeet Singh</DD>
</DL>
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