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<div class="subTitle">com.fasterxml.jackson.databind</div>
<h2 title="Class JsonDeserializer" class="title">Class JsonDeserializer&lt;T&gt;</h2>
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<li>com.fasterxml.jackson.databind.JsonDeserializer&lt;T&gt;</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../com/fasterxml/jackson/databind/deser/NullValueProvider.html" title="interface in com.fasterxml.jackson.databind.deser">NullValueProvider</a></dd>
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<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../com/fasterxml/jackson/databind/deser/AbstractDeserializer.html" title="class in com.fasterxml.jackson.databind.deser">AbstractDeserializer</a>, <a href="../../../../com/fasterxml/jackson/databind/deser/impl/ErrorThrowingDeserializer.html" title="class in com.fasterxml.jackson.databind.deser.impl">ErrorThrowingDeserializer</a>, <a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.None.html" title="class in com.fasterxml.jackson.databind">JsonDeserializer.None</a>, <a href="../../../../com/fasterxml/jackson/databind/deser/std/StdDeserializer.html" title="class in com.fasterxml.jackson.databind.deser.std">StdDeserializer</a>, <a href="../../../../com/fasterxml/jackson/databind/deser/impl/TypeWrappedDeserializer.html" title="class in com.fasterxml.jackson.databind.deser.impl">TypeWrappedDeserializer</a></dd>
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<pre>public abstract class <span class="typeNameLabel">JsonDeserializer&lt;T&gt;</span>
extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
implements <a href="../../../../com/fasterxml/jackson/databind/deser/NullValueProvider.html" title="interface in com.fasterxml.jackson.databind.deser">NullValueProvider</a></pre>
<div class="block">Abstract class that defines API used by <a href="../../../../com/fasterxml/jackson/databind/ObjectMapper.html" title="class in com.fasterxml.jackson.databind"><code>ObjectMapper</code></a> (and
 other chained <a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="class in com.fasterxml.jackson.databind"><code>JsonDeserializer</code></a>s too) to deserialize Objects of
 arbitrary types from JSON, using provided <a href="http://fasterxml.github.com/jackson-core/javadoc/2.9/com/fasterxml/jackson/core/JsonParser.html?is-external=true" title="class or interface in com.fasterxml.jackson.core"><code>JsonParser</code></a>.
<p>
 Custom deserializers should usually not directly extend this class,
 but instead extend <a href="../../../../com/fasterxml/jackson/databind/deser/std/StdDeserializer.html" title="class in com.fasterxml.jackson.databind.deser.std"><code>StdDeserializer</code></a>
 (or its subtypes like <a href="../../../../com/fasterxml/jackson/databind/deser/std/StdScalarDeserializer.html" title="class in com.fasterxml.jackson.databind.deser.std"><code>StdScalarDeserializer</code></a>).
<p>
 If deserializer is an aggregate one -- meaning it delegates handling of some
 of its contents by using other deserializer(s) -- it typically also needs
 to implement <a href="../../../../com/fasterxml/jackson/databind/deser/ResolvableDeserializer.html" title="interface in com.fasterxml.jackson.databind.deser"><code>ResolvableDeserializer</code></a>,
 which can locate dependant deserializers. This is important to allow dynamic
 overrides of deserializers; separate call interface is needed to separate
 resolution of dependant deserializers (which may have cyclic link back
 to deserializer itself, directly or indirectly).
<p>
 In addition, to support per-property annotations (to configure aspects
 of deserialization on per-property basis), deserializers may want
 to implement
 <a href="../../../../com/fasterxml/jackson/databind/deser/ContextualDeserializer.html" title="interface in com.fasterxml.jackson.databind.deser"><code>ContextualDeserializer</code></a>,
 which allows specialization of deserializers: call to
 <a href="../../../../com/fasterxml/jackson/databind/deser/ContextualDeserializer.html#createContextual-com.fasterxml.jackson.databind.DeserializationContext-com.fasterxml.jackson.databind.BeanProperty-"><code>ContextualDeserializer.createContextual(com.fasterxml.jackson.databind.DeserializationContext, com.fasterxml.jackson.databind.BeanProperty)</code></a>
 is passed information on property, and can create a newly configured
 deserializer for handling that particular property.
<p>
 If both
 <a href="../../../../com/fasterxml/jackson/databind/deser/ResolvableDeserializer.html" title="interface in com.fasterxml.jackson.databind.deser"><code>ResolvableDeserializer</code></a> and
 <a href="../../../../com/fasterxml/jackson/databind/deser/ContextualDeserializer.html" title="interface in com.fasterxml.jackson.databind.deser"><code>ContextualDeserializer</code></a>
 are implemented, resolution of deserializers occurs before
 contextualization.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.None.html" title="class in com.fasterxml.jackson.databind">JsonDeserializer.None</a></span></code>
<div class="block">This marker class is only to be used with annotations, to
 indicate that <b>no deserializer is configured</b>.</div>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#JsonDeserializer--">JsonDeserializer</a></span>()</code>&nbsp;</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<td class="colFirst"><code>abstract <a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="type parameter in JsonDeserializer">T</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#deserialize-com.fasterxml.jackson.core.JsonParser-com.fasterxml.jackson.databind.DeserializationContext-">deserialize</a></span>(<a href="http://fasterxml.github.com/jackson-core/javadoc/2.9/com/fasterxml/jackson/core/JsonParser.html?is-external=true" title="class or interface in com.fasterxml.jackson.core">JsonParser</a>&nbsp;p,
           <a href="../../../../com/fasterxml/jackson/databind/DeserializationContext.html" title="class in com.fasterxml.jackson.databind">DeserializationContext</a>&nbsp;ctxt)</code>
<div class="block">Method that can be called to ask implementation to deserialize
 JSON content into the value type this serializer handles.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="type parameter in JsonDeserializer">T</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#deserialize-com.fasterxml.jackson.core.JsonParser-com.fasterxml.jackson.databind.DeserializationContext-T-">deserialize</a></span>(<a href="http://fasterxml.github.com/jackson-core/javadoc/2.9/com/fasterxml/jackson/core/JsonParser.html?is-external=true" title="class or interface in com.fasterxml.jackson.core">JsonParser</a>&nbsp;p,
           <a href="../../../../com/fasterxml/jackson/databind/DeserializationContext.html" title="class in com.fasterxml.jackson.databind">DeserializationContext</a>&nbsp;ctxt,
           <a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="type parameter in JsonDeserializer">T</a>&nbsp;intoValue)</code>
<div class="block">Alternate deserialization method (compared to the most commonly
 used, <a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#deserialize-com.fasterxml.jackson.core.JsonParser-com.fasterxml.jackson.databind.DeserializationContext-"><code>deserialize(JsonParser, DeserializationContext)</code></a>),
 which takes in initialized value instance, to be
 configured and/or populated by deserializer.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#deserializeWithType-com.fasterxml.jackson.core.JsonParser-com.fasterxml.jackson.databind.DeserializationContext-com.fasterxml.jackson.databind.jsontype.TypeDeserializer-">deserializeWithType</a></span>(<a href="http://fasterxml.github.com/jackson-core/javadoc/2.9/com/fasterxml/jackson/core/JsonParser.html?is-external=true" title="class or interface in com.fasterxml.jackson.core">JsonParser</a>&nbsp;p,
                   <a href="../../../../com/fasterxml/jackson/databind/DeserializationContext.html" title="class in com.fasterxml.jackson.databind">DeserializationContext</a>&nbsp;ctxt,
                   <a href="../../../../com/fasterxml/jackson/databind/jsontype/TypeDeserializer.html" title="class in com.fasterxml.jackson.databind.jsontype">TypeDeserializer</a>&nbsp;typeDeserializer)</code>
<div class="block">Deserialization called when type being deserialized is defined to
 contain additional type identifier, to allow for correctly
 instantiating correct subtype.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../com/fasterxml/jackson/databind/deser/SettableBeanProperty.html" title="class in com.fasterxml.jackson.databind.deser">SettableBeanProperty</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#findBackReference-java.lang.String-">findBackReference</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;refName)</code>
<div class="block">Method needed by <a href="../../../../com/fasterxml/jackson/databind/deser/BeanDeserializerFactory.html" title="class in com.fasterxml.jackson.databind.deser"><code>BeanDeserializerFactory</code></a> to properly link
 managed- and back-reference pairs.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="class in com.fasterxml.jackson.databind">JsonDeserializer</a>&lt;?&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#getDelegatee--">getDelegatee</a></span>()</code>
<div class="block">Accessor that can be used to determine if this deserializer uses
 another deserializer for actual deserialization, by delegating
 calls.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../../com/fasterxml/jackson/databind/util/AccessPattern.html" title="enum in com.fasterxml.jackson.databind.util">AccessPattern</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#getEmptyAccessPattern--">getEmptyAccessPattern</a></span>()</code>
<div class="block">This method may be called in conjunction with calls to
 <a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#getEmptyValue-com.fasterxml.jackson.databind.DeserializationContext-"><code>getEmptyValue(DeserializationContext)</code></a>, to check whether it needs
 to be called just once (static values), or each time empty value is
 needed.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#getEmptyValue--">getEmptyValue</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">Since 2.6 Use overloaded variant that takes context argument</span></div>
</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#getEmptyValue-com.fasterxml.jackson.databind.DeserializationContext-">getEmptyValue</a></span>(<a href="../../../../com/fasterxml/jackson/databind/DeserializationContext.html" title="class in com.fasterxml.jackson.databind">DeserializationContext</a>&nbsp;ctxt)</code>
<div class="block">Method called to determine value to be used for "empty" values
 (most commonly when deserializing from empty JSON Strings).</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#getKnownPropertyNames--">getKnownPropertyNames</a></span>()</code>
<div class="block">Method that will
 either return null to indicate that type being deserializers
 has no concept of properties; or a collection of identifiers
 for which <code>toString</code> will give external property
 name.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../../com/fasterxml/jackson/databind/util/AccessPattern.html" title="enum in com.fasterxml.jackson.databind.util">AccessPattern</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#getNullAccessPattern--">getNullAccessPattern</a></span>()</code>
<div class="block">Default implementation indicates that "null value" to use for input null
 is simply Java `null` for all deserializers, unless overridden by sub-classes.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="type parameter in JsonDeserializer">T</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#getNullValue--">getNullValue</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">Since 2.6 Use overloaded variant that takes context argument</span></div>
</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="type parameter in JsonDeserializer">T</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#getNullValue-com.fasterxml.jackson.databind.DeserializationContext-">getNullValue</a></span>(<a href="../../../../com/fasterxml/jackson/databind/DeserializationContext.html" title="class in com.fasterxml.jackson.databind">DeserializationContext</a>&nbsp;ctxt)</code>
<div class="block">Method that can be called to determine value to be used for
 representing null values (values deserialized when JSON token
 is <a href="http://fasterxml.github.com/jackson-core/javadoc/2.9/com/fasterxml/jackson/core/JsonToken.html?is-external=true#VALUE_NULL" title="class or interface in com.fasterxml.jackson.core"><code>JsonToken.VALUE_NULL</code></a>).</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="../../../../com/fasterxml/jackson/databind/deser/impl/ObjectIdReader.html" title="class in com.fasterxml.jackson.databind.deser.impl">ObjectIdReader</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#getObjectIdReader--">getObjectIdReader</a></span>()</code>
<div class="block">Accessor that can be used to check whether this deserializer
 is expecting to possibly get an Object Identifier value instead of full value
 serialization, and if so, should be able to resolve it to actual
 Object instance to return as deserialized value.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;?&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#handledType--">handledType</a></span>()</code>
<div class="block">Method for accessing type of values this deserializer produces.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#isCachable--">isCachable</a></span>()</code>
<div class="block">Method called to see if deserializer instance is cachable and
 usable for other properties of same type (type for which instance
 was created).</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="class in com.fasterxml.jackson.databind">JsonDeserializer</a>&lt;?&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#replaceDelegatee-com.fasterxml.jackson.databind.JsonDeserializer-">replaceDelegatee</a></span>(<a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="class in com.fasterxml.jackson.databind">JsonDeserializer</a>&lt;?&gt;&nbsp;delegatee)</code>
<div class="block">Method that can be called to try to replace deserializer this deserializer
 delegates calls to.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#supportsUpdate-com.fasterxml.jackson.databind.DeserializationConfig-">supportsUpdate</a></span>(<a href="../../../../com/fasterxml/jackson/databind/DeserializationConfig.html" title="class in com.fasterxml.jackson.databind">DeserializationConfig</a>&nbsp;config)</code>
<div class="block">Introspection method that may be called to see whether deserializer supports
 update of an existing value (aka "merging") or not.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="class in com.fasterxml.jackson.databind">JsonDeserializer</a>&lt;<a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="type parameter in JsonDeserializer">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#unwrappingDeserializer-com.fasterxml.jackson.databind.util.NameTransformer-">unwrappingDeserializer</a></span>(<a href="../../../../com/fasterxml/jackson/databind/util/NameTransformer.html" title="class in com.fasterxml.jackson.databind.util">NameTransformer</a>&nbsp;unwrapper)</code>
<div class="block">Method that will return deserializer instance that is able
 to handle "unwrapped" value instances
 If no unwrapped instance can be constructed, will simply
 return this object as-is.</div>
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<code><a href="http://docs.oracle.com/javase/7/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/7/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/7/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/7/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/7/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/7/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/7/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/7/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/7/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/7/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/7/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;JsonDeserializer()</pre>
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<h4>deserialize</h4>
<pre>public abstract&nbsp;<a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="type parameter in JsonDeserializer">T</a>&nbsp;deserialize(<a href="http://fasterxml.github.com/jackson-core/javadoc/2.9/com/fasterxml/jackson/core/JsonParser.html?is-external=true" title="class or interface in com.fasterxml.jackson.core">JsonParser</a>&nbsp;p,
                              <a href="../../../../com/fasterxml/jackson/databind/DeserializationContext.html" title="class in com.fasterxml.jackson.databind">DeserializationContext</a>&nbsp;ctxt)
                       throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>,
                              <a href="http://fasterxml.github.com/jackson-core/javadoc/2.9/com/fasterxml/jackson/core/JsonProcessingException.html?is-external=true" title="class or interface in com.fasterxml.jackson.core">JsonProcessingException</a></pre>
<div class="block">Method that can be called to ask implementation to deserialize
 JSON content into the value type this serializer handles.
 Returned instance is to be constructed by method itself.
<p>
 Pre-condition for this method is that the parser points to the
 first event that is part of value to deserializer (and which 
 is never JSON 'null' literal, more on this below): for simple
 types it may be the only value; and for structured types the
 Object start marker or a FIELD_NAME.
 </p>
 <p>
 The two possible input conditions for structured types result
 from polymorphism via fields. In the ordinary case, Jackson
 calls this method when it has encountered an OBJECT_START,
 and the method implementation must advance to the next token to
 see the first field name. If the application configures
 polymorphism via a field, then the object looks like the following.
  <pre>
      {
          "@class": "class name",
          ...
      }
  </pre>
  Jackson consumes the two tokens (the <tt>@class</tt> field name
  and its value) in order to learn the class and select the deserializer.
  Thus, the stream is pointing to the FIELD_NAME for the first field
  after the @class. Thus, if you want your method to work correctly
  both with and without polymorphism, you must begin your method with:
  <pre>
       if (p.getCurrentToken() == JsonToken.START_OBJECT) {
         p.nextToken();
       }
  </pre>
 This results in the stream pointing to the field name, so that
 the two conditions align.
 <p>
 Post-condition is that the parser will point to the last
 event that is part of deserialized value (or in case deserialization
 fails, event that was not recognized or usable, which may be
 the same event as the one it pointed to upon call).
<p>
 Note that this method is never called for JSON null literal,
 and thus deserializers need (and should) not check for it.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>p</code> - Parsed used for reading JSON content</dd>
<dd><code>ctxt</code> - Context that can be used to access information about
   this deserialization activity.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Deserialized value</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
<dd><code><a href="http://fasterxml.github.com/jackson-core/javadoc/2.9/com/fasterxml/jackson/core/JsonProcessingException.html?is-external=true" title="class or interface in com.fasterxml.jackson.core">JsonProcessingException</a></code></dd>
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<h4>deserialize</h4>
<pre>public&nbsp;<a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="type parameter in JsonDeserializer">T</a>&nbsp;deserialize(<a href="http://fasterxml.github.com/jackson-core/javadoc/2.9/com/fasterxml/jackson/core/JsonParser.html?is-external=true" title="class or interface in com.fasterxml.jackson.core">JsonParser</a>&nbsp;p,
                     <a href="../../../../com/fasterxml/jackson/databind/DeserializationContext.html" title="class in com.fasterxml.jackson.databind">DeserializationContext</a>&nbsp;ctxt,
                     <a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="type parameter in JsonDeserializer">T</a>&nbsp;intoValue)
              throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Alternate deserialization method (compared to the most commonly
 used, <a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#deserialize-com.fasterxml.jackson.core.JsonParser-com.fasterxml.jackson.databind.DeserializationContext-"><code>deserialize(JsonParser, DeserializationContext)</code></a>),
 which takes in initialized value instance, to be
 configured and/or populated by deserializer.
 Method is not necessarily used (or supported) by all types
 (it will not work for immutable types, for obvious reasons):
 most commonly it is used for Collections and Maps.
 It may be used both with "updating readers" (for POJOs) and
 when Collections and Maps use "getter as setter".
<p>
 Default implementation just throws
 <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang"><code>UnsupportedOperationException</code></a>, to indicate that types
 that do not explicitly add support do not necessarily support
 update-existing-value operation (esp. immutable types)</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
</dl>
</li>
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<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;deserializeWithType(<a href="http://fasterxml.github.com/jackson-core/javadoc/2.9/com/fasterxml/jackson/core/JsonParser.html?is-external=true" title="class or interface in com.fasterxml.jackson.core">JsonParser</a>&nbsp;p,
                                  <a href="../../../../com/fasterxml/jackson/databind/DeserializationContext.html" title="class in com.fasterxml.jackson.databind">DeserializationContext</a>&nbsp;ctxt,
                                  <a href="../../../../com/fasterxml/jackson/databind/jsontype/TypeDeserializer.html" title="class in com.fasterxml.jackson.databind.jsontype">TypeDeserializer</a>&nbsp;typeDeserializer)
                           throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Deserialization called when type being deserialized is defined to
 contain additional type identifier, to allow for correctly
 instantiating correct subtype. This can be due to annotation on
 type (or its supertype), or due to global settings without
 annotations.
<p>
 Default implementation may work for some types, but ideally subclasses
 should not rely on current default implementation.
 Implementation is mostly provided to avoid compilation errors with older
 code.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>typeDeserializer</code> - Deserializer to use for handling type information</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/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&nbsp;<a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="class in com.fasterxml.jackson.databind">JsonDeserializer</a>&lt;<a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="type parameter in JsonDeserializer">T</a>&gt;&nbsp;unwrappingDeserializer(<a href="../../../../com/fasterxml/jackson/databind/util/NameTransformer.html" title="class in com.fasterxml.jackson.databind.util">NameTransformer</a>&nbsp;unwrapper)</pre>
<div class="block">Method that will return deserializer instance that is able
 to handle "unwrapped" value instances
 If no unwrapped instance can be constructed, will simply
 return this object as-is.
<p>
 Default implementation just returns 'this'
 indicating that no unwrapped variant exists</div>
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<pre>public&nbsp;<a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="class in com.fasterxml.jackson.databind">JsonDeserializer</a>&lt;?&gt;&nbsp;replaceDelegatee(<a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="class in com.fasterxml.jackson.databind">JsonDeserializer</a>&lt;?&gt;&nbsp;delegatee)</pre>
<div class="block">Method that can be called to try to replace deserializer this deserializer
 delegates calls to. If not supported (either this deserializer does not
 delegate anything; or it does not want any changes), should either
 throw <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang"><code>UnsupportedOperationException</code></a> (if operation does not
 make sense or is not allowed); or return this deserializer as is.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.1</dd>
</dl>
</li>
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<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;?&gt;&nbsp;handledType()</pre>
<div class="block">Method for accessing type of values this deserializer produces.
 Note that this information is not guaranteed to be exact -- it
 may be a more generic (super-type) -- but it should not be
 incorrect (return a non-related type).
<p>
 Default implementation will return null, which means almost same
 same as returning <code>Object.class</code> would; that is, that
 nothing is known about handled type.
<p></div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.3</dd>
</dl>
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<pre>public&nbsp;boolean&nbsp;isCachable()</pre>
<div class="block">Method called to see if deserializer instance is cachable and
 usable for other properties of same type (type for which instance
 was created).
<p>
 Note that cached instances are still resolved on per-property basis,
 if instance implements <a href="../../../../com/fasterxml/jackson/databind/deser/ResolvableDeserializer.html" title="interface in com.fasterxml.jackson.databind.deser"><code>ResolvableDeserializer</code></a>:
 cached instance is just as the base. This means that in most cases it is safe to
 cache instances; however, it only makes sense to cache instances
 if instantiation is expensive, or if instances are heavy-weight.
<p>
 Default implementation returns false, to indicate that no caching
 is done.</div>
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<pre>public&nbsp;<a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="class in com.fasterxml.jackson.databind">JsonDeserializer</a>&lt;?&gt;&nbsp;getDelegatee()</pre>
<div class="block">Accessor that can be used to determine if this deserializer uses
 another deserializer for actual deserialization, by delegating
 calls. If so, will return immediate delegate (which itself may
 delegate to further deserializers); otherwise will return null.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Deserializer this deserializer delegates calls to, if null;
   null otherwise.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.1</dd>
</dl>
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<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&gt;&nbsp;getKnownPropertyNames()</pre>
<div class="block">Method that will
 either return null to indicate that type being deserializers
 has no concept of properties; or a collection of identifiers
 for which <code>toString</code> will give external property
 name.
 This is only to be used for error reporting and diagnostics
 purposes (most commonly, to accompany "unknown property"
 exception).</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
</dl>
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<pre>public&nbsp;<a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="type parameter in JsonDeserializer">T</a>&nbsp;getNullValue(<a href="../../../../com/fasterxml/jackson/databind/DeserializationContext.html" title="class in com.fasterxml.jackson.databind">DeserializationContext</a>&nbsp;ctxt)
               throws <a href="../../../../com/fasterxml/jackson/databind/JsonMappingException.html" title="class in com.fasterxml.jackson.databind">JsonMappingException</a></pre>
<div class="block">Method that can be called to determine value to be used for
 representing null values (values deserialized when JSON token
 is <a href="http://fasterxml.github.com/jackson-core/javadoc/2.9/com/fasterxml/jackson/core/JsonToken.html?is-external=true#VALUE_NULL" title="class or interface in com.fasterxml.jackson.core"><code>JsonToken.VALUE_NULL</code></a>). Usually this is simply
 Java null, but for some types (especially primitives) it may be
 necessary to use non-null values.
<p>
 Since version 2.6 (in which the context argument was added), call is
 expected to be made each and every time a null token needs to
 be handled.
<p>
 Default implementation simply returns null.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../com/fasterxml/jackson/databind/deser/NullValueProvider.html#getNullValue-com.fasterxml.jackson.databind.DeserializationContext-">getNullValue</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fasterxml/jackson/databind/deser/NullValueProvider.html" title="interface in com.fasterxml.jackson.databind.deser">NullValueProvider</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../com/fasterxml/jackson/databind/JsonMappingException.html" title="class in com.fasterxml.jackson.databind">JsonMappingException</a></code></dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.6 Added to replace earlier no-arguments variant</dd>
</dl>
</li>
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<pre>public&nbsp;<a href="../../../../com/fasterxml/jackson/databind/util/AccessPattern.html" title="enum in com.fasterxml.jackson.databind.util">AccessPattern</a>&nbsp;getNullAccessPattern()</pre>
<div class="block">Default implementation indicates that "null value" to use for input null
 is simply Java `null` for all deserializers, unless overridden by sub-classes.
 This information may be used as optimization.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../com/fasterxml/jackson/databind/deser/NullValueProvider.html#getNullAccessPattern--">getNullAccessPattern</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fasterxml/jackson/databind/deser/NullValueProvider.html" title="interface in com.fasterxml.jackson.databind.deser">NullValueProvider</a></code></dd>
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<pre>public&nbsp;<a href="../../../../com/fasterxml/jackson/databind/util/AccessPattern.html" title="enum in com.fasterxml.jackson.databind.util">AccessPattern</a>&nbsp;getEmptyAccessPattern()</pre>
<div class="block">This method may be called in conjunction with calls to
 <a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#getEmptyValue-com.fasterxml.jackson.databind.DeserializationContext-"><code>getEmptyValue(DeserializationContext)</code></a>, to check whether it needs
 to be called just once (static values), or each time empty value is
 needed.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.9</dd>
</dl>
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<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;getEmptyValue(<a href="../../../../com/fasterxml/jackson/databind/DeserializationContext.html" title="class in com.fasterxml.jackson.databind">DeserializationContext</a>&nbsp;ctxt)
                     throws <a href="../../../../com/fasterxml/jackson/databind/JsonMappingException.html" title="class in com.fasterxml.jackson.databind">JsonMappingException</a></pre>
<div class="block">Method called to determine value to be used for "empty" values
 (most commonly when deserializing from empty JSON Strings).
 Usually this is same as <a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#getNullValue-com.fasterxml.jackson.databind.DeserializationContext-"><code>getNullValue(com.fasterxml.jackson.databind.DeserializationContext)</code></a> (which in turn
 is usually simply Java null), but it can be overridden
 for types. Or, if type should never be converted from empty
 String, method can also throw an exception.
<p>
 Since version 2.6 (in which the context argument was added), call is
 expected to be made each and every time an empty value is needed.
<p>
 Since version 2.9 does not require return of `T` any more.
<p>
 Default implementation simply calls <a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html#getNullValue-com.fasterxml.jackson.databind.DeserializationContext-"><code>getNullValue(com.fasterxml.jackson.databind.DeserializationContext)</code></a> and
 returns value.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../com/fasterxml/jackson/databind/JsonMappingException.html" title="class in com.fasterxml.jackson.databind">JsonMappingException</a></code></dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.6 Added to replace earlier no-arguments variant</dd>
</dl>
</li>
</ul>
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<pre>public&nbsp;<a href="../../../../com/fasterxml/jackson/databind/deser/impl/ObjectIdReader.html" title="class in com.fasterxml.jackson.databind.deser.impl">ObjectIdReader</a>&nbsp;getObjectIdReader()</pre>
<div class="block">Accessor that can be used to check whether this deserializer
 is expecting to possibly get an Object Identifier value instead of full value
 serialization, and if so, should be able to resolve it to actual
 Object instance to return as deserialized value.
<p>
 Default implementation returns null, as support cannot be implemented
 generically. Some standard deserializers (most notably
 <a href="../../../../com/fasterxml/jackson/databind/deser/BeanDeserializer.html" title="class in com.fasterxml.jackson.databind.deser"><code>BeanDeserializer</code></a>)
 do implement this feature, and may return reader instance, depending on exact
 configuration of instance (which is based on type, and referring property).</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>ObjectIdReader used for resolving possible Object Identifier
    value, instead of full value serialization, if deserializer can do that;
    null if no Object Id is expected.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
</dl>
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<pre>public&nbsp;<a href="../../../../com/fasterxml/jackson/databind/deser/SettableBeanProperty.html" title="class in com.fasterxml.jackson.databind.deser">SettableBeanProperty</a>&nbsp;findBackReference(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;refName)</pre>
<div class="block">Method needed by <a href="../../../../com/fasterxml/jackson/databind/deser/BeanDeserializerFactory.html" title="class in com.fasterxml.jackson.databind.deser"><code>BeanDeserializerFactory</code></a> to properly link
 managed- and back-reference pairs.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.2 (was moved out of <code>BeanDeserializerBase</code>)</dd>
</dl>
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<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</a>&nbsp;supportsUpdate(<a href="../../../../com/fasterxml/jackson/databind/DeserializationConfig.html" title="class in com.fasterxml.jackson.databind">DeserializationConfig</a>&nbsp;config)</pre>
<div class="block">Introspection method that may be called to see whether deserializer supports
 update of an existing value (aka "merging") or not. Return value should either
 be <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Boolean.html?is-external=true#FALSE" title="class or interface in java.lang"><code>Boolean.FALSE</code></a> if update is not supported at all (immutable values);
 <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Boolean.html?is-external=true#TRUE" title="class or interface in java.lang"><code>Boolean.TRUE</code></a> if update should usually work (regular POJOs, for example),
 or <code>null</code> if this is either not known, or may sometimes work.
<p>
 Information gathered is typically used to either prevent merging update for
 property (either by skipping, if based on global defaults; or by exception during
 deserialization construction if explicit attempt made) if <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Boolean.html?is-external=true#FALSE" title="class or interface in java.lang"><code>Boolean.FALSE</code></a>
 returned, or inclusion if <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Boolean.html?is-external=true#TRUE" title="class or interface in java.lang"><code>Boolean.TRUE</code></a> is specified. If "unknown" case
 (<code>null</code> returned) behavior is to exclude property if global defaults
 used; or to allow if explicit per-type or property merging is defined.
<p>
 Default implementation returns <code>null</code> to allow explicit per-type
 or per-property attempts.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.9</dd>
</dl>
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<h4>getNullValue</h4>
<pre><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public&nbsp;<a href="../../../../com/fasterxml/jackson/databind/JsonDeserializer.html" title="type parameter in JsonDeserializer">T</a>&nbsp;getNullValue()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">Since 2.6 Use overloaded variant that takes context argument</span></div>
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<h4>getEmptyValue</h4>
<pre><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;getEmptyValue()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">Since 2.6 Use overloaded variant that takes context argument</span></div>
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