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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.eclipse.jetty.proxy</a></div> |
| <h2 title="Interface AsyncMiddleManServlet.ContentTransformer" class="title">Interface AsyncMiddleManServlet.ContentTransformer</h2> |
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| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="AfterContentTransformer.html" title="class in org.eclipse.jetty.proxy">AfterContentTransformer</a></code>, <code><a href="AsyncMiddleManServlet.GZIPContentTransformer.html" title="class in org.eclipse.jetty.proxy">AsyncMiddleManServlet.GZIPContentTransformer</a></code></dd> |
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| <dd><a href="AsyncMiddleManServlet.html" title="class in org.eclipse.jetty.proxy">AsyncMiddleManServlet</a></dd> |
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| <pre>public static interface <span class="typeNameLabel">AsyncMiddleManServlet.ContentTransformer</span></pre> |
| <div class="block"><p>Allows applications to transform upstream and downstream content.</p> |
| <p>Typical use cases of transformations are URL rewriting of HTML anchors |
| (where the value of the <code>href</code> attribute of <a> elements |
| is modified by the proxy), field renaming of JSON documents, etc.</p> |
| <p>Applications should override <a href="AsyncMiddleManServlet.html#newClientRequestContentTransformer(jakarta.servlet.http.HttpServletRequest,org.eclipse.jetty.client.api.Request)"><code>AsyncMiddleManServlet.newClientRequestContentTransformer(HttpServletRequest, Request)</code></a> |
| and/or <a href="AsyncMiddleManServlet.html#newServerResponseContentTransformer(jakarta.servlet.http.HttpServletRequest,jakarta.servlet.http.HttpServletResponse,org.eclipse.jetty.client.api.Response)"><code>AsyncMiddleManServlet.newServerResponseContentTransformer(HttpServletRequest, HttpServletResponse, Response)</code></a> |
| to provide the transformer implementation.</p></div> |
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| <td class="colFirst"><code>static <a href="AsyncMiddleManServlet.ContentTransformer.html" title="interface in org.eclipse.jetty.proxy">AsyncMiddleManServlet.ContentTransformer</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#IDENTITY">IDENTITY</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">The identity transformer that does not perform any transformation.</div> |
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| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#transform(java.nio.ByteBuffer,boolean,java.util.List)">transform</a></span>​(java.nio.ByteBuffer input, |
| boolean finished, |
| java.util.List<java.nio.ByteBuffer> output)</code></th> |
| <td class="colLast"> |
| <div class="block">Transforms the given input byte buffers into (possibly multiple) byte buffers.</div> |
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| <h4>IDENTITY</h4> |
| <pre>static final <a href="AsyncMiddleManServlet.ContentTransformer.html" title="interface in org.eclipse.jetty.proxy">AsyncMiddleManServlet.ContentTransformer</a> IDENTITY</pre> |
| <div class="block">The identity transformer that does not perform any transformation.</div> |
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| <h4>transform</h4> |
| <pre class="methodSignature">void transform​(java.nio.ByteBuffer input, |
| boolean finished, |
| java.util.List<java.nio.ByteBuffer> output) |
| throws java.io.IOException</pre> |
| <div class="block"><p>Transforms the given input byte buffers into (possibly multiple) byte buffers.</p> |
| <p>The transformation must happen synchronously in the context of a call |
| to this method (it is not supported to perform the transformation in another |
| thread spawned during the call to this method). |
| The transformation may happen or not, depending on the transformer implementation. |
| For example, a buffering transformer may buffer the input aside, and only |
| perform the transformation when the whole input is provided (by looking at the |
| <code>finished</code> flag).</p> |
| <p>The input buffer will be cleared and reused after the call to this method. |
| Implementations that want to buffer aside the input (or part of it) must copy |
| the input bytes that they want to buffer.</p> |
| <p>Typical implementations:</p> |
| <pre> |
| // Identity transformation (no transformation, the input is copied to the output) |
| public void transform(ByteBuffer input, boolean finished, List<ByteBuffer> output) |
| { |
| output.add(input); |
| } |
| |
| // Discard transformation (all input is discarded) |
| public void transform(ByteBuffer input, boolean finished, List<ByteBuffer> output) |
| { |
| // Empty |
| } |
| |
| // Buffering identity transformation (all input is buffered aside until it is finished) |
| public void transform(ByteBuffer input, boolean finished, List<ByteBuffer> output) |
| { |
| ByteBuffer copy = ByteBuffer.allocate(input.remaining()); |
| copy.put(input).flip(); |
| store(copy); |
| |
| if (finished) |
| { |
| List<ByteBuffer> copies = retrieve(); |
| output.addAll(copies); |
| } |
| } |
| </pre></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>input</code> - the input content to transform (may be of length zero)</dd> |
| <dd><code>finished</code> - whether the input content is finished or more will come</dd> |
| <dd><code>output</code> - where to put the transformed output content</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.io.IOException</code> - in case of transformation failures</dd> |
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