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| <li><a href="blob-attachments.html">File upload/download</a></li> |
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| <article class="doc"> |
| <a name="section-top"></a> |
| <h1 class="page">File upload/download</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The Apache Isis application library provides the <a href="#refguide:applib-cm:classes/value-types.adoc#Blob" class="page unresolved">Blob</a> value type (binary large objects) and also the <a href="#refguide:applib-cm:classes/value-types.adoc#Clob" class="page unresolved">Clob</a> |
| value type (character large object), each of which also includes metadata about the data (specifically the filename and mime type).</p> |
| </div> |
| <div class="paragraph"> |
| <p>A class can define a property using either of these types, for example:</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="screenshots"><a class="anchor" href="#screenshots"></a>Screenshots</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The following screenshots are taken from the example <a href="https://github.com/apache/isis-app-todoapp">TodoApp</a>:</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="view-mode-empty"><a class="anchor" href="#view-mode-empty"></a>View mode, empty</h3> |
| <div class="paragraph"> |
| <p><code>Blob</code> field rendered as attachment (with no data):</p> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <a class="image" href="../_images/blob-attachments/010-attachment-field.png"><img src="../_images/blob-attachments/010-attachment-field-940.png" alt="010 attachment field 940" width="800px"></a> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Note that this screenshot show an earlier version of the <a href="../about.html" class="page">Wicket viewer</a> UI (specifically, pre 1.8.0).</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="edit-mode"><a class="anchor" href="#edit-mode"></a>Edit mode</h3> |
| <div class="paragraph"> |
| <p>Hit edit; 'choose file' button appears:</p> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <a class="image" href="../_images/blob-attachments/020-edit-choose-file.png"><img src="../_images/blob-attachments/020-edit-choose-file-940.png" alt="020 edit choose file 940" width="800px"></a> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="choose-file"><a class="anchor" href="#choose-file"></a>Choose file</h3> |
| <div class="paragraph"> |
| <p>Choose file using the regular browser window:</p> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <a class="image" href="../_images/blob-attachments/030-choose-file-using-browser.png"><img src="../_images/blob-attachments/030-choose-file-using-browser-520.png" alt="030 choose file using browser 520" width="520px"></a> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Chosen file is indicated:</p> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <a class="image" href="../_images/blob-attachments/040-edit-chosen-file-indicated.png"><img src="../_images/blob-attachments/040-edit-chosen-file-indicated-940.png" alt="040 edit chosen file indicated 940" width="800px"></a> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="image-rendered"><a class="anchor" href="#image-rendered"></a>Image rendered</h3> |
| <div class="paragraph"> |
| <p>Back in view mode (ie once hit OK) if the <code>Blob</code> is an image, then it is shown:</p> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <a class="image" href="../_images/blob-attachments/050-ok-if-image-then-rendered.png"><img src="../_images/blob-attachments/050-ok-if-image-then-rendered-940.png" alt="050 ok if image then rendered 940" width="800px"></a> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="download"><a class="anchor" href="#download"></a>Download</h3> |
| <div class="paragraph"> |
| <p><code>Blob</code> can be downloaded:</p> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <a class="image" href="../_images/blob-attachments/060-download.png"><img src="../_images/blob-attachments/060-download-940.png" alt="060 download 940" width="800px"></a> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="clear"><a class="anchor" href="#clear"></a>Clear</h3> |
| <div class="paragraph"> |
| <p>Back in edit mode, can choose a different file or clear (assuming property is not mandatory):</p> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <a class="image" href="../_images/blob-attachments/070-edit-clear.png"><img src="../_images/blob-attachments/070-edit-clear-940.png" alt="070 edit clear 940" width="800px"></a> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="domain-code"><a class="anchor" href="#domain-code"></a>Domain Code</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>To define a <code>Blob</code>, use:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">private Blob attachment; |
| @javax.jdo.annotations.Persistent(defaultFetchGroup="false") |
| @javax.jdo.annotations.Persistent(defaultFetchGroup="false", columns = { |
| @javax.jdo.annotations.Column(name = "attachment_name"), |
| @javax.jdo.annotations.Column(name = "attachment_mimetype"), |
| @javax.jdo.annotations.Column(name = "attachment_bytes", jdbcType = "BLOB", sqlType = "BLOB") |
| }) |
| @Property( |
| domainEvent = AttachmentDomainEvent.class, |
| optionality = Optionality.OPTIONAL |
| ) |
| public Blob getAttachment() { return attachment; } |
| public void setAttachment(final Blob attachment) { this.attachment = attachment; }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>To define a <code>Clob</code>, use:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">private Clob doc; |
| @javax.jdo.annotations.Persistent(defaultFetchGroup="false", columns = { |
| @javax.jdo.annotations.Column(name = "doc_name"), |
| @javax.jdo.annotations.Column(name = "doc_mimetype"), |
| @javax.jdo.annotations.Column(name = "doc_chars", jdbcType = "CLOB", sqlType = "CLOB") |
| }) |
| @Property( |
| optionality = Optionality.OPTIONAL |
| ) |
| public Clob getDoc() { return doc; } |
| public void setDoc(final Clob doc) { this.doc = doc; }</code></pre> |
| </div> |
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| <div class="paragraph"> |
| <p>The <code>Blob</code> and <code>Clob</code> types can also be used as parameters to actions.</p> |
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