gson/docs/javadocs/com/google/gson/TypeAdapter.html - platform/external/gson - Git at Google

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 TypeAdapter (Gson 2.1 API)
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 <FONT SIZE="-1">
 com.google.gson</FONT>
 <BR>
 Class TypeAdapter&lt;T&gt;</H2>
 <PRE>
 <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
   <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>com.google.gson.TypeAdapter&lt;T&gt;</B>
 </PRE>
 <HR>
 <DL>
 <DT><PRE>public abstract class <B>TypeAdapter&lt;T&gt;</B><DT>extends <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL>
 </PRE>

 <P>
 Converts Java objects to and from JSON.

  <h3>Defining a type's JSON form</h3>
  By default Gson converts application classes to JSON using its built-in type
  adapters. If Gson's default JSON conversion isn't appropriate for a type,
  extend this class to customize the conversion. Here's an example of a type
  adapter for an (X,Y) coordinate point: <pre>   <code>public class PointAdapter extends TypeAdapter&lt;Point&gt; {
      public Point read(JsonReader reader) throws IOException {
        if (reader.peek() == JsonToken.NULL) {
          reader.nextNull();
          return null;
        }
        String xy = reader.nextString();
        String[] parts = xy.split(",");
        int x = Integer.parseInt(parts[0]);
        int y = Integer.parseInt(parts[1]);
        return new Point(x, y);
      }
      public void write(JsonWriter writer, Point value) throws IOException {
        if (value == null) {
          writer.nullValue();
          return;
        }
        String xy = value.getX() + "," + value.getY();
        writer.value(xy);
      }
    }</code></pre>
  With this type adapter installed, Gson will convert <code>Points</code> to JSON as
  strings like <code>"5,8"</code> rather than objects like <code>{"x":5,"y":8}</code>. In
  this case the type adapter binds a rich Java class to a compact JSON value.

  <p>The <A HREF="../../../com/google/gson/TypeAdapter.html#read(com.google.gson.stream.JsonReader)"><CODE>read()</CODE></A> method must read exactly one value
  and <A HREF="../../../com/google/gson/TypeAdapter.html#write(com.google.gson.stream.JsonWriter, T)"><CODE>write()</CODE></A> must write exactly one value.
  For primitive types this is means readers should make exactly one call to
  <code>nextBoolean()</code>, <code>nextDouble()</code>, <code>nextInt()</code>, <code>nextLong()</code>, <code>nextString()</code> or <code>nextNull()</code>. Writers should make
  exactly one call to one of <code>value()</code> or <code>nullValue()</code>.
  For arrays, type adapters should start with a call to <code>beginArray()</code>,
  convert all elements, and finish with a call to <code>endArray()</code>. For
  objects, they should start with <code>beginObject()</code>, convert the object,
  and finish with <code>endObject()</code>. Failing to convert a value or converting
  too many values may cause the application to crash.

  <p>Type adapters should be prepared to read null from the stream and write it
  to the stream. Alternatively, they should use <A HREF="../../../com/google/gson/TypeAdapter.html#nullSafe()"><CODE>nullSafe()</CODE></A> method while
  registering the type adapter with Gson. If your <code>Gson</code> instance
  has been configured to <A HREF="../../../com/google/gson/GsonBuilder.html#serializeNulls()"><CODE>GsonBuilder.serializeNulls()</CODE></A>, these nulls will be
  written to the final document. Otherwise the value (and the corresponding name
  when writing to a JSON object) will be omitted automatically. In either case
  your type adapter must handle null.

  <p>To use a custom type adapter with Gson, you must <i>register</i> it with a
  <A HREF="../../../com/google/gson/GsonBuilder.html" title="class in com.google.gson"><CODE>GsonBuilder</CODE></A>: <pre>   <code>GsonBuilder builder = new GsonBuilder();
    builder.registerTypeAdapter(Point.class, new PointAdapter());
    // if PointAdapter didn't check for nulls in its read/write methods, you should instead use
    // builder.registerTypeAdapter(Point.class, new PointAdapter().nullSafe());
    ...
    Gson gson = builder.create();
  </code></pre>
 <P>

 <P>
 <DL>
 <DT><B>Since:</B></DT>
   <DD>2.1</DD>
 </DL>
 <HR>

 <P>

 <!-- ======== CONSTRUCTOR SUMMARY ======== -->

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 <TD><CODE><B><A HREF="../../../com/google/gson/TypeAdapter.html#TypeAdapter()">TypeAdapter</A></B>()</CODE>

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 <TR BGCOLOR="white" CLASS="TableRowColor">
 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 <CODE>&nbsp;<A HREF="../../../com/google/gson/TypeAdapter.html" title="class in com.google.gson">TypeAdapter</A>&lt;<A HREF="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</A>&gt;</CODE></FONT></TD>
 <TD><CODE><B><A HREF="../../../com/google/gson/TypeAdapter.html#nullSafe()">nullSafe</A></B>()</CODE>

 <BR>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This wrapper method is used to make a type adapter null tolerant.</TD>
 </TR>
 <TR BGCOLOR="white" CLASS="TableRowColor">
 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 <CODE>abstract &nbsp;<A HREF="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</A></CODE></FONT></TD>
 <TD><CODE><B><A HREF="../../../com/google/gson/TypeAdapter.html#read(com.google.gson.stream.JsonReader)">read</A></B>(<A HREF="../../../com/google/gson/stream/JsonReader.html" title="class in com.google.gson.stream">JsonReader</A>&nbsp;in)</CODE>

 <BR>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reads one JSON value (an array, object, string, number, boolean or null)
  and converts it to a Java object.</TD>
 </TR>
 <TR BGCOLOR="white" CLASS="TableRowColor">
 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 <CODE>abstract &nbsp;void</CODE></FONT></TD>
 <TD><CODE><B><A HREF="../../../com/google/gson/TypeAdapter.html#write(com.google.gson.stream.JsonWriter, T)">write</A></B>(<A HREF="../../../com/google/gson/stream/JsonWriter.html" title="class in com.google.gson.stream">JsonWriter</A>&nbsp;out,
       <A HREF="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</A>&nbsp;value)</CODE>

 <BR>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Writes one JSON value (an array, object, string, number, boolean or null)
  for <code>value</code>.</TD>
 </TR>
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 <TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
 <TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
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 <TR BGCOLOR="white" CLASS="TableRowColor">
 <TD><CODE><A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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 <A NAME="TypeAdapter()"><!-- --></A><H3>
 TypeAdapter</H3>
 <PRE>
 public <B>TypeAdapter</B>()</PRE>
 <DL>
 </DL>

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 <A NAME="write(com.google.gson.stream.JsonWriter,java.lang.Object)"><!-- --></A><A NAME="write(com.google.gson.stream.JsonWriter, T)"><!-- --></A><H3>
 write</H3>
 <PRE>
 public abstract void <B>write</B>(<A HREF="../../../com/google/gson/stream/JsonWriter.html" title="class in com.google.gson.stream">JsonWriter</A>&nbsp;out,
                            <A HREF="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</A>&nbsp;value)
                     throws <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
 <DL>
 <DD>Writes one JSON value (an array, object, string, number, boolean or null)
  for <code>value</code>.
 <P>
 <DD><DL>
 <DT><B>Parameters:</B><DD><CODE>value</CODE> - the Java object to write. May be null.
 <DT><B>Throws:</B>
 <DD><CODE><A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
 </DD>
 </DL>
 <HR>

 <A NAME="nullSafe()"><!-- --></A><H3>
 nullSafe</H3>
 <PRE>
 public final <A HREF="../../../com/google/gson/TypeAdapter.html" title="class in com.google.gson">TypeAdapter</A>&lt;<A HREF="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</A>&gt; <B>nullSafe</B>()</PRE>
 <DL>
 <DD>This wrapper method is used to make a type adapter null tolerant. In general, a
  type adapter is required to handle nulls in write and read methods. Here is how this
  is typically done:<br>
  <pre>   <code>Gson gson = new GsonBuilder().registerTypeAdapter(Foo.class,
    new TypeAdapter&lt;Foo&gt;() {
      public Foo read(JsonReader in) throws IOException {
        if (in.peek() == JsonToken.NULL) {
          in.nextNull();
          return null;
        }
        // read a Foo from in and return it
      }
      public void write(JsonWriter out, Foo src) throws IOException {
        if (src == null) {
          out.nullValue();
          return;
        }
        // write src as JSON to out
      }
    }).create();
  </code></pre>
  You can avoid this boilerplate handling of nulls by wrapping your type adapter with
  this method. Here is how we will rewrite the above example:
  <pre>   <code>Gson gson = new GsonBuilder().registerTypeAdapter(Foo.class,
    new TypeAdapter&lt;Foo&gt;() {
      public Foo read(JsonReader in) throws IOException {
        // read a Foo from in and return it
      }
      public void write(JsonWriter out, Foo src) throws IOException {
        // write src as JSON to out
      }
    }.nullSafe()).create();
  </code></pre>
  Note that we didn't need to check for nulls in our type adapter after we used nullSafe.
 <P>
 <DD><DL>
 </DL>
 </DD>
 </DL>
 <HR>

 <A NAME="read(com.google.gson.stream.JsonReader)"><!-- --></A><H3>
 read</H3>
 <PRE>
 public abstract <A HREF="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</A> <B>read</B>(<A HREF="../../../com/google/gson/stream/JsonReader.html" title="class in com.google.gson.stream">JsonReader</A>&nbsp;in)
                 throws <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
 <DL>
 <DD>Reads one JSON value (an array, object, string, number, boolean or null)
  and converts it to a Java object. Returns the converted object.
 <P>
 <DD><DL>

 <DT><B>Returns:</B><DD>the converted Java object. May be null.
 <DT><B>Throws:</B>
 <DD><CODE><A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
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	com.google.gson</FONT>
	<BR>
	Class TypeAdapter<T></H2>
	<PRE>
	<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
	<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>com.google.gson.TypeAdapter<T></B>
	</PRE>
	<HR>
	<DL>
	<DT><PRE>public abstract class <B>TypeAdapter<T></B><DT>extends <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL>
	</PRE>

	<P>
	Converts Java objects to and from JSON.

	<h3>Defining a type's JSON form</h3>
	By default Gson converts application classes to JSON using its built-in type
	adapters. If Gson's default JSON conversion isn't appropriate for a type,
	extend this class to customize the conversion. Here's an example of a type
	adapter for an (X,Y) coordinate point: <pre> <code>public class PointAdapter extends TypeAdapter<Point> {
	public Point read(JsonReader reader) throws IOException {
	if (reader.peek() == JsonToken.NULL) {
	reader.nextNull();
	return null;
	}
	String xy = reader.nextString();
	String[] parts = xy.split(",");
	int x = Integer.parseInt(parts[0]);
	int y = Integer.parseInt(parts[1]);
	return new Point(x, y);
	}
	public void write(JsonWriter writer, Point value) throws IOException {
	if (value == null) {
	writer.nullValue();
	return;
	}
	String xy = value.getX() + "," + value.getY();
	writer.value(xy);
	}
	}</code></pre>
	With this type adapter installed, Gson will convert <code>Points</code> to JSON as
	strings like <code>"5,8"</code> rather than objects like <code>{"x":5,"y":8}</code>. In
	this case the type adapter binds a rich Java class to a compact JSON value.

	<p>The <A HREF="../../../com/google/gson/TypeAdapter.html#read(com.google.gson.stream.JsonReader)"><CODE>read()</CODE></A> method must read exactly one value
	and <A HREF="../../../com/google/gson/TypeAdapter.html#write(com.google.gson.stream.JsonWriter, T)"><CODE>write()</CODE></A> must write exactly one value.
	For primitive types this is means readers should make exactly one call to
	<code>nextBoolean()</code>, <code>nextDouble()</code>, <code>nextInt()</code>, <code>nextLong()</code>, <code>nextString()</code> or <code>nextNull()</code>. Writers should make
	exactly one call to one of <code>value()</code> or <code>nullValue()</code>.
	For arrays, type adapters should start with a call to <code>beginArray()</code>,
	convert all elements, and finish with a call to <code>endArray()</code>. For
	objects, they should start with <code>beginObject()</code>, convert the object,
	and finish with <code>endObject()</code>. Failing to convert a value or converting
	too many values may cause the application to crash.

	<p>Type adapters should be prepared to read null from the stream and write it
	to the stream. Alternatively, they should use <A HREF="../../../com/google/gson/TypeAdapter.html#nullSafe()"><CODE>nullSafe()</CODE></A> method while
	registering the type adapter with Gson. If your <code>Gson</code> instance
	has been configured to <A HREF="../../../com/google/gson/GsonBuilder.html#serializeNulls()"><CODE>GsonBuilder.serializeNulls()</CODE></A>, these nulls will be
	written to the final document. Otherwise the value (and the corresponding name
	when writing to a JSON object) will be omitted automatically. In either case
	your type adapter must handle null.

	<p>To use a custom type adapter with Gson, you must <i>register</i> it with a
	<A HREF="../../../com/google/gson/GsonBuilder.html" title="class in com.google.gson"><CODE>GsonBuilder</CODE></A>: <pre> <code>GsonBuilder builder = new GsonBuilder();
	builder.registerTypeAdapter(Point.class, new PointAdapter());
	// if PointAdapter didn't check for nulls in its read/write methods, you should instead use
	// builder.registerTypeAdapter(Point.class, new PointAdapter().nullSafe());
	...
	Gson gson = builder.create();
	</code></pre>
	<P>

	<P>
	<DL>
	<DT><B>Since:</B></DT>
	<DD>2.1</DD>
	</DL>
	<HR>

	<P>

	<!-- ======== CONSTRUCTOR SUMMARY ======== -->

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	<B>Constructor Summary</B></FONT></TH>
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	<TD><CODE><B><A HREF="../../../com/google/gson/TypeAdapter.html#TypeAdapter()">TypeAdapter</A></B>()</CODE>

	<BR>
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	<B>Method Summary</B></FONT></TH>
	</TR>
	<TR BGCOLOR="white" CLASS="TableRowColor">
	<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
	<CODE> <A HREF="../../../com/google/gson/TypeAdapter.html" title="class in com.google.gson">TypeAdapter</A><<A HREF="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</A>></CODE></FONT></TD>
	<TD><CODE><B><A HREF="../../../com/google/gson/TypeAdapter.html#nullSafe()">nullSafe</A></B>()</CODE>

	<BR>
	This wrapper method is used to make a type adapter null tolerant.</TD>
	</TR>
	<TR BGCOLOR="white" CLASS="TableRowColor">
	<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
	<CODE>abstract  <A HREF="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</A></CODE></FONT></TD>
	<TD><CODE><B><A HREF="../../../com/google/gson/TypeAdapter.html#read(com.google.gson.stream.JsonReader)">read</A></B>(<A HREF="../../../com/google/gson/stream/JsonReader.html" title="class in com.google.gson.stream">JsonReader</A> in)</CODE>

	<BR>
	Reads one JSON value (an array, object, string, number, boolean or null)
	and converts it to a Java object.</TD>
	</TR>
	<TR BGCOLOR="white" CLASS="TableRowColor">
	<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
	<CODE>abstract  void</CODE></FONT></TD>
	<TD><CODE><B><A HREF="../../../com/google/gson/TypeAdapter.html#write(com.google.gson.stream.JsonWriter, T)">write</A></B>(<A HREF="../../../com/google/gson/stream/JsonWriter.html" title="class in com.google.gson.stream">JsonWriter</A> out,
	<A HREF="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</A> value)</CODE>

	<BR>
	Writes one JSON value (an array, object, string, number, boolean or null)
	for <code>value</code>.</TD>
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	<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
	<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
	<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
	</TR>
	<TR BGCOLOR="white" CLASS="TableRowColor">
	<TD><CODE><A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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	<!-- ========= CONSTRUCTOR DETAIL ======== -->

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	<A NAME="TypeAdapter()"><!-- --></A><H3>
	TypeAdapter</H3>
	<PRE>
	public <B>TypeAdapter</B>()</PRE>
	<DL>
	</DL>

	<!-- ============ METHOD DETAIL ========== -->

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	<B>Method Detail</B></FONT></TH>
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	</TABLE>

	<A NAME="write(com.google.gson.stream.JsonWriter,java.lang.Object)"><!-- --></A><A NAME="write(com.google.gson.stream.JsonWriter, T)"><!-- --></A><H3>
	write</H3>
	<PRE>
	public abstract void <B>write</B>(<A HREF="../../../com/google/gson/stream/JsonWriter.html" title="class in com.google.gson.stream">JsonWriter</A> out,
	<A HREF="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</A> value)
	throws <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
	<DL>
	<DD>Writes one JSON value (an array, object, string, number, boolean or null)
	for <code>value</code>.
	<P>
	<DD><DL>
	<DT><B>Parameters:</B><DD><CODE>value</CODE> - the Java object to write. May be null.
	<DT><B>Throws:</B>
	<DD><CODE><A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
	</DD>
	</DL>
	<HR>

	<A NAME="nullSafe()"><!-- --></A><H3>
	nullSafe</H3>
	<PRE>
	public final <A HREF="../../../com/google/gson/TypeAdapter.html" title="class in com.google.gson">TypeAdapter</A><<A HREF="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</A>> <B>nullSafe</B>()</PRE>
	<DL>
	<DD>This wrapper method is used to make a type adapter null tolerant. In general, a
	type adapter is required to handle nulls in write and read methods. Here is how this
	is typically done:<br>
	<pre> <code>Gson gson = new GsonBuilder().registerTypeAdapter(Foo.class,
	new TypeAdapter<Foo>() {
	public Foo read(JsonReader in) throws IOException {
	if (in.peek() == JsonToken.NULL) {
	in.nextNull();
	return null;
	}
	// read a Foo from in and return it
	}
	public void write(JsonWriter out, Foo src) throws IOException {
	if (src == null) {
	out.nullValue();
	return;
	}
	// write src as JSON to out
	}
	}).create();
	</code></pre>
	You can avoid this boilerplate handling of nulls by wrapping your type adapter with
	this method. Here is how we will rewrite the above example:
	<pre> <code>Gson gson = new GsonBuilder().registerTypeAdapter(Foo.class,
	new TypeAdapter<Foo>() {
	public Foo read(JsonReader in) throws IOException {
	// read a Foo from in and return it
	}
	public void write(JsonWriter out, Foo src) throws IOException {
	// write src as JSON to out
	}
	}.nullSafe()).create();
	</code></pre>
	Note that we didn't need to check for nulls in our type adapter after we used nullSafe.
	<P>
	<DD><DL>
	</DL>
	</DD>
	</DL>
	<HR>

	<A NAME="read(com.google.gson.stream.JsonReader)"><!-- --></A><H3>
	read</H3>
	<PRE>
	public abstract <A HREF="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</A> <B>read</B>(<A HREF="../../../com/google/gson/stream/JsonReader.html" title="class in com.google.gson.stream">JsonReader</A> in)
	throws <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
	<DL>
	<DD>Reads one JSON value (an array, object, string, number, boolean or null)
	and converts it to a Java object. Returns the converted object.
	<P>
	<DD><DL>

	<DT><B>Returns:</B><DD>the converted Java object. May be null.
	<DT><B>Throws:</B>
	<DD><CODE><A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
	</DD>
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