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| <div class="subTitle">javax.ws.rs.ext</div> |
| <h2 title="Interface MessageBodyReader" class="title">Interface MessageBodyReader<T></h2> |
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| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Java type supported by the provider</dd> |
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| <br> |
| <pre>public interface <span class="typeNameLabel">MessageBodyReader<T></span></pre> |
| <div class="block">Contract for a provider that supports the conversion of a stream to a |
| Java type. |
| |
| A <code>MessageBodyReader</code> implementation may be annotated |
| with <a href="../../../../javax/ws/rs/Consumes.html" title="annotation in javax.ws.rs"><code>Consumes</code></a> to restrict the media types for which it will |
| be considered suitable. |
| <p> |
| Providers implementing <code>MessageBodyReader</code> contract must be either programmatically |
| registered in an API runtime or must be annotated with |
| <a href="../../../../javax/ws/rs/ext/Provider.html" title="annotation in javax.ws.rs.ext"><code>@Provider</code></a> annotation to be automatically discovered |
| by the runtime during a provider scanning phase. |
| </p></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.0</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../javax/ws/rs/ext/Provider.html" title="annotation in javax.ws.rs.ext"><code>Provider</code></a>, |
| <a href="../../../../javax/ws/rs/Consumes.html" title="annotation in javax.ws.rs"><code>Consumes</code></a></dd> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/ws/rs/ext/MessageBodyReader.html#isReadable-java.lang.Class-java.lang.reflect.Type-java.lang.annotation.Annotation:A-javax.ws.rs.core.MediaType-">isReadable</a></span>(java.lang.Class<?> type, |
| java.lang.reflect.Type genericType, |
| java.lang.annotation.Annotation[] annotations, |
| <a href="../../../../javax/ws/rs/core/MediaType.html" title="class in javax.ws.rs.core">MediaType</a> mediaType)</code> |
| <div class="block">Ascertain if the MessageBodyReader can produce an instance of a |
| particular type.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../javax/ws/rs/ext/MessageBodyReader.html" title="type parameter in MessageBodyReader">T</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/ws/rs/ext/MessageBodyReader.html#readFrom-java.lang.Class-java.lang.reflect.Type-java.lang.annotation.Annotation:A-javax.ws.rs.core.MediaType-javax.ws.rs.core.MultivaluedMap-java.io.InputStream-">readFrom</a></span>(java.lang.Class<<a href="../../../../javax/ws/rs/ext/MessageBodyReader.html" title="type parameter in MessageBodyReader">T</a>> type, |
| java.lang.reflect.Type genericType, |
| java.lang.annotation.Annotation[] annotations, |
| <a href="../../../../javax/ws/rs/core/MediaType.html" title="class in javax.ws.rs.core">MediaType</a> mediaType, |
| <a href="../../../../javax/ws/rs/core/MultivaluedMap.html" title="interface in javax.ws.rs.core">MultivaluedMap</a><java.lang.String,java.lang.String> httpHeaders, |
| java.io.InputStream entityStream)</code> |
| <div class="block">Read a type from the <code>InputStream</code>.</div> |
| </td> |
| </tr> |
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| <h3>Method Detail</h3> |
| <a name="isReadable-java.lang.Class-java.lang.reflect.Type-java.lang.annotation.Annotation:A-javax.ws.rs.core.MediaType-"> |
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| <h4>isReadable</h4> |
| <pre>boolean isReadable(java.lang.Class<?> type, |
| java.lang.reflect.Type genericType, |
| java.lang.annotation.Annotation[] annotations, |
| <a href="../../../../javax/ws/rs/core/MediaType.html" title="class in javax.ws.rs.core">MediaType</a> mediaType)</pre> |
| <div class="block">Ascertain if the MessageBodyReader can produce an instance of a |
| particular type. The <code>type</code> parameter gives the |
| class of the instance that should be produced, the <code>genericType</code> parameter |
| gives the <code>java.lang.reflect.Type</code> of the instance |
| that should be produced. |
| E.g. if the instance to be produced is <code>List<String></code>, the <code>type</code> parameter |
| will be <code>java.util.List</code> and the <code>genericType</code> parameter will be |
| <code>java.lang.reflect.ParameterizedType</code>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>type</code> - the class of instance to be produced.</dd> |
| <dd><code>genericType</code> - the type of instance to be produced. E.g. if the |
| message body is to be converted into a method parameter, this will be |
| the formal type of the method parameter as returned by |
| <code>Method.getGenericParameterTypes</code>.</dd> |
| <dd><code>annotations</code> - an array of the annotations on the declaration of the |
| artifact that will be initialized with the produced instance. E.g. if the |
| message body is to be converted into a method parameter, this will be |
| the annotations on that parameter returned by |
| <code>Method.getParameterAnnotations</code>.</dd> |
| <dd><code>mediaType</code> - the media type of the HTTP entity, if one is not |
| specified in the request then <code>application/octet-stream</code> is |
| used.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>true</code> if the type is supported, otherwise <code>false</code>.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="readFrom-java.lang.Class-java.lang.reflect.Type-java.lang.annotation.Annotation:A-javax.ws.rs.core.MediaType-javax.ws.rs.core.MultivaluedMap-java.io.InputStream-"> |
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| <h4>readFrom</h4> |
| <pre><a href="../../../../javax/ws/rs/ext/MessageBodyReader.html" title="type parameter in MessageBodyReader">T</a> readFrom(java.lang.Class<<a href="../../../../javax/ws/rs/ext/MessageBodyReader.html" title="type parameter in MessageBodyReader">T</a>> type, |
| java.lang.reflect.Type genericType, |
| java.lang.annotation.Annotation[] annotations, |
| <a href="../../../../javax/ws/rs/core/MediaType.html" title="class in javax.ws.rs.core">MediaType</a> mediaType, |
| <a href="../../../../javax/ws/rs/core/MultivaluedMap.html" title="interface in javax.ws.rs.core">MultivaluedMap</a><java.lang.String,java.lang.String> httpHeaders, |
| java.io.InputStream entityStream) |
| throws java.io.IOException, |
| <a href="../../../../javax/ws/rs/WebApplicationException.html" title="class in javax.ws.rs">WebApplicationException</a></pre> |
| <div class="block">Read a type from the <code>InputStream</code>. |
| <p> |
| In case the entity input stream is empty, the reader is expected to either return a |
| Java representation of a zero-length entity or throw a <a href="../../../../javax/ws/rs/core/NoContentException.html" title="class in javax.ws.rs.core"><code>NoContentException</code></a> |
| in case no zero-length entity representation is defined for the supported Java type. |
| A <code>NoContentException</code>, if thrown by a message body reader while reading a server |
| request entity, is automatically translated by the server runtime into a <a href="../../../../javax/ws/rs/BadRequestException.html" title="class in javax.ws.rs"><code>BadRequestException</code></a> |
| wrapping the original <code>NoContentException</code> and rethrown for a standard processing by |
| the registered <a href="../../../../javax/ws/rs/ext/ExceptionMapper.html" title="interface in javax.ws.rs.ext"><code>exception mappers</code></a>. |
| </p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>type</code> - the type that is to be read from the entity stream.</dd> |
| <dd><code>genericType</code> - the type of instance to be produced. E.g. if the |
| message body is to be converted into a method parameter, this will be |
| the formal type of the method parameter as returned by |
| <code>Method.getGenericParameterTypes</code>.</dd> |
| <dd><code>annotations</code> - an array of the annotations on the declaration of the |
| artifact that will be initialized with the produced instance. E.g. |
| if the message body is to be converted into a method parameter, this |
| will be the annotations on that parameter returned by |
| <code>Method.getParameterAnnotations</code>.</dd> |
| <dd><code>mediaType</code> - the media type of the HTTP entity.</dd> |
| <dd><code>httpHeaders</code> - the read-only HTTP headers associated with HTTP entity.</dd> |
| <dd><code>entityStream</code> - the <code>InputStream</code> of the HTTP entity. The |
| caller is responsible for ensuring that the input stream ends when the |
| entity has been consumed. The implementation should not close the input |
| stream.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the type that was read from the stream. In case the entity input stream is empty, the reader |
| is expected to either return an instance representing a zero-length entity or throw |
| a <a href="../../../../javax/ws/rs/core/NoContentException.html" title="class in javax.ws.rs.core"><code>NoContentException</code></a> in case no zero-length entity representation is |
| defined for the supported Java type.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.io.IOException</code> - if an IO error arises. In case the entity input stream is empty |
| and the reader is not able to produce a Java representation for |
| a zero-length entity, <code>NoContentException</code> is expected to |
| be thrown.</dd> |
| <dd><code><a href="../../../../javax/ws/rs/WebApplicationException.html" title="class in javax.ws.rs">WebApplicationException</a></code> - if a specific HTTP error response needs to be produced. |
| Only effective if thrown prior to the response being committed.</dd> |
| </dl> |
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