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

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 <div class="subTitle">com.google.gson</div>
 <h2 title="Class TypeAdapter" class="title">Class TypeAdapter&lt;T&gt;</h2>
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 <pre>public abstract class <span class="typeNameLabel">TypeAdapter&lt;T&gt;</span>
 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></pre>
 <div class="block">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></div>
 <dl>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>2.1</dd>
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 <td class="colOne"><code><span class="memberNameLink"><a href="../../../com/google/gson/TypeAdapter.html#TypeAdapter--">TypeAdapter</a></span>()</code>&nbsp;</td>
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 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Method and Description</th>
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 <tr id="i0" class="altColor">
 <td class="colFirst"><code><a href="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/google/gson/TypeAdapter.html#fromJson-java.io.Reader-">fromJson</a></span>(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/io/Reader.html?is-external=true" title="class or interface in java.io">Reader</a>&nbsp;in)</code>
 <div class="block">Converts the JSON document in <code>in</code> to a Java object.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code><a href="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/google/gson/TypeAdapter.html#fromJson-java.lang.String-">fromJson</a></span>(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;json)</code>
 <div class="block">Converts the JSON document in <code>json</code> to a Java object.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code><a href="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/google/gson/TypeAdapter.html#fromJsonTree-com.google.gson.JsonElement-">fromJsonTree</a></span>(<a href="../../../com/google/gson/JsonElement.html" title="class in com.google.gson">JsonElement</a>&nbsp;jsonTree)</code>
 <div class="block">Converts <code>jsonTree</code> to a Java object.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code><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></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/google/gson/TypeAdapter.html#nullSafe--">nullSafe</a></span>()</code>
 <div class="block">This wrapper method is used to make a type adapter null tolerant.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>abstract <a href="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/google/gson/TypeAdapter.html#read-com.google.gson.stream.JsonReader-">read</a></span>(<a href="../../../com/google/gson/stream/JsonReader.html" title="class in com.google.gson.stream">JsonReader</a>&nbsp;in)</code>
 <div class="block">Reads one JSON value (an array, object, string, number, boolean or null)
  and converts it to a Java object.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/google/gson/TypeAdapter.html#toJson-T-">toJson</a></span>(<a href="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</a>&nbsp;value)</code>
 <div class="block">Converts <code>value</code> to a JSON document.</div>
 </td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/google/gson/TypeAdapter.html#toJson-java.io.Writer-T-">toJson</a></span>(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/io/Writer.html?is-external=true" title="class or interface in java.io">Writer</a>&nbsp;out,
       <a href="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</a>&nbsp;value)</code>
 <div class="block">Converts <code>value</code> to a JSON document and writes it to <code>out</code>.</div>
 </td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code><a href="../../../com/google/gson/JsonElement.html" title="class in com.google.gson">JsonElement</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/google/gson/TypeAdapter.html#toJsonTree-T-">toJsonTree</a></span>(<a href="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</a>&nbsp;value)</code>
 <div class="block">Converts <code>value</code> to a JSON tree.</div>
 </td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code>abstract void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/google/gson/TypeAdapter.html#write-com.google.gson.stream.JsonWriter-T-">write</a></span>(<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>
 <div class="block">Writes one JSON value (an array, object, string, number, boolean or null)
  for <code>value</code>.</div>
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 <h3>Methods inherited from class&nbsp;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></h3>
 <code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <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#finalize--" title="class or interface in java.lang">finalize</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></li>
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 <pre>public&nbsp;TypeAdapter()</pre>
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 <h4>write</h4>
 <pre>public abstract&nbsp;void&nbsp;write(<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>
 <div class="block">Writes one JSON value (an array, object, string, number, boolean or null)
  for <code>value</code>.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>value</code> - the Java object to write. May be null.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <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></dd>
 </dl>
 </li>
 </ul>
 <a name="toJson-java.io.Writer-java.lang.Object-">
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 <h4>toJson</h4>
 <pre>public final&nbsp;void&nbsp;toJson(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/io/Writer.html?is-external=true" title="class or interface in java.io">Writer</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>
 <div class="block">Converts <code>value</code> to a JSON document and writes it to <code>out</code>.
  Unlike Gson's similar <a href="../../../com/google/gson/Gson.html#toJson-com.google.gson.JsonElement-java.lang.Appendable-"><code>toJson</code></a>
  method, this write is strict. Create a <a href="../../../com/google/gson/stream/JsonWriter.html#setLenient-boolean-"><code>lenient</code></a> <code>JsonWriter</code> and call
  <a href="../../../com/google/gson/TypeAdapter.html#write-com.google.gson.stream.JsonWriter-T-"><code>write(com.google.gson.stream.JsonWriter, Object)</code></a> for lenient
  writing.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>value</code> - the Java object to convert. May be null.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <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></dd>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>2.2</dd>
 </dl>
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 <h4>nullSafe</h4>
 <pre>public final&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;&nbsp;nullSafe()</pre>
 <div class="block">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.</div>
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 <pre>public final&nbsp;<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;toJson(<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>
 <div class="block">Converts <code>value</code> to a JSON document. Unlike Gson's similar <a href="../../../com/google/gson/Gson.html#toJson-java.lang.Object-"><code>toJson</code></a> method, this write is strict. Create a <a href="../../../com/google/gson/stream/JsonWriter.html#setLenient-boolean-"><code>lenient</code></a> <code>JsonWriter</code> and call
  <a href="../../../com/google/gson/TypeAdapter.html#write-com.google.gson.stream.JsonWriter-T-"><code>write(com.google.gson.stream.JsonWriter, Object)</code></a> for lenient
  writing.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>value</code> - the Java object to convert. May be null.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <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></dd>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>2.2</dd>
 </dl>
 </li>
 </ul>
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 <pre>public final&nbsp;<a href="../../../com/google/gson/JsonElement.html" title="class in com.google.gson">JsonElement</a>&nbsp;toJsonTree(<a href="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</a>&nbsp;value)</pre>
 <div class="block">Converts <code>value</code> to a JSON tree.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>value</code> - the Java object to convert. May be null.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the converted JSON tree. May be <a href="../../../com/google/gson/JsonNull.html" title="class in com.google.gson"><code>JsonNull</code></a>.</dd>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>2.2</dd>
 </dl>
 </li>
 </ul>
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 <h4>read</h4>
 <pre>public abstract&nbsp;<a href="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</a>&nbsp;read(<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>
 <div class="block">Reads one JSON value (an array, object, string, number, boolean or null)
  and converts it to a Java object. Returns the converted object.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the converted Java object. May be null.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <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></dd>
 </dl>
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 <pre>public final&nbsp;<a href="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</a>&nbsp;fromJson(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/io/Reader.html?is-external=true" title="class or interface in java.io">Reader</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>
 <div class="block">Converts the JSON document in <code>in</code> to a Java object. Unlike Gson's
  similar <a href="../../../com/google/gson/Gson.html#fromJson-java.io.Reader-java.lang.Class-"><code>fromJson</code></a> method, this
  read is strict. Create a <a href="../../../com/google/gson/stream/JsonReader.html#setLenient-boolean-"><code>lenient</code></a>
  <code>JsonReader</code> and call <a href="../../../com/google/gson/TypeAdapter.html#read-com.google.gson.stream.JsonReader-"><code>read(JsonReader)</code></a> for lenient reading.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the converted Java object. May be null.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <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></dd>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>2.2</dd>
 </dl>
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 </ul>
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 <pre>public final&nbsp;<a href="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</a>&nbsp;fromJson(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;json)
                  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>
 <div class="block">Converts the JSON document in <code>json</code> to a Java object. Unlike Gson's
  similar <a href="../../../com/google/gson/Gson.html#fromJson-java.lang.String-java.lang.Class-"><code>fromJson</code></a> method, this read is
  strict. Create a <a href="../../../com/google/gson/stream/JsonReader.html#setLenient-boolean-"><code>lenient</code></a> <code>JsonReader</code> and call <a href="../../../com/google/gson/TypeAdapter.html#read-com.google.gson.stream.JsonReader-"><code>read(JsonReader)</code></a> for lenient reading.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the converted Java object. May be null.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <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></dd>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>2.2</dd>
 </dl>
 </li>
 </ul>
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 <h4>fromJsonTree</h4>
 <pre>public final&nbsp;<a href="../../../com/google/gson/TypeAdapter.html" title="type parameter in TypeAdapter">T</a>&nbsp;fromJsonTree(<a href="../../../com/google/gson/JsonElement.html" title="class in com.google.gson">JsonElement</a>&nbsp;jsonTree)</pre>
 <div class="block">Converts <code>jsonTree</code> to a Java object.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>jsonTree</code> - the Java object to convert. May be <a href="../../../com/google/gson/JsonNull.html" title="class in com.google.gson"><code>JsonNull</code></a>.</dd>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>2.2</dd>
 </dl>
 </li>
 </ul>
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