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<div class="subTitle">org.apache.commons.io.output</div>
<h2 title="Class DeferredFileOutputStream" class="title">Class DeferredFileOutputStream</h2>
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<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li><a href="http://docs.oracle.com/javase/7/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">java.io.OutputStream</a></li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html" title="class in org.apache.commons.io.output">org.apache.commons.io.output.ThresholdingOutputStream</a></li>
<li>
<ul class="inheritance">
<li>org.apache.commons.io.output.DeferredFileOutputStream</li>
</ul>
</li>
</ul>
</li>
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</li>
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<div class="description">
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<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/io/Flushable.html?is-external=true" title="class or interface in java.io">Flushable</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></dd>
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<pre>public class <span class="typeNameLabel">DeferredFileOutputStream</span>
extends <a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html" title="class in org.apache.commons.io.output">ThresholdingOutputStream</a></pre>
<div class="block">An output stream which will retain data in memory until a specified
threshold is reached, and only then commit it to disk. If the stream is
closed before the threshold is reached, the data will not be written to
disk at all.
<p>
This class originated in FileUpload processing. In this use case, you do
not know in advance the size of the file being uploaded. If the file is small
you want to store it in memory (for speed), but if the file is large you want
to store it to file (to avoid memory issues).</div>
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<h3>Constructor Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/commons/io/output/DeferredFileOutputStream.html#DeferredFileOutputStream-int-java.io.File-">DeferredFileOutputStream</a></span>(int threshold,
<a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> outputFile)</code>
<div class="block">Constructs an instance of this class which will trigger an event at the
specified threshold, and save data to a file beyond that point.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/commons/io/output/DeferredFileOutputStream.html#DeferredFileOutputStream-int-int-java.io.File-">DeferredFileOutputStream</a></span>(int threshold,
int initialBufferSize,
<a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> outputFile)</code>
<div class="block">Constructs an instance of this class which will trigger an event at the
specified threshold, and save data to a file beyond that point.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/commons/io/output/DeferredFileOutputStream.html#DeferredFileOutputStream-int-int-java.lang.String-java.lang.String-java.io.File-">DeferredFileOutputStream</a></span>(int threshold,
int initialBufferSize,
<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> prefix,
<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> suffix,
<a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> directory)</code>
<div class="block">Constructs an instance of this class which will trigger an event at the
specified threshold, and save data to a temporary file beyond that point.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/commons/io/output/DeferredFileOutputStream.html#DeferredFileOutputStream-int-java.lang.String-java.lang.String-java.io.File-">DeferredFileOutputStream</a></span>(int threshold,
<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> prefix,
<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> suffix,
<a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> directory)</code>
<div class="block">Constructs an instance of this class which will trigger an event at the
specified threshold, and save data to a temporary file beyond that point.</div>
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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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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/commons/io/output/DeferredFileOutputStream.html#close--">close</a></span>()</code>
<div class="block">Closes underlying output stream, and mark this as closed</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/commons/io/output/DeferredFileOutputStream.html#getData--">getData</a></span>()</code>
<div class="block">Returns the data for this output stream as an array of bytes, assuming
that the data has been retained in memory.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/commons/io/output/DeferredFileOutputStream.html#getFile--">getFile</a></span>()</code>
<div class="block">Returns either the output file specified in the constructor or
the temporary file created or null.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>protected <a href="http://docs.oracle.com/javase/7/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/commons/io/output/DeferredFileOutputStream.html#getStream--">getStream</a></span>()</code>
<div class="block">Returns the current output stream.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/commons/io/output/DeferredFileOutputStream.html#isInMemory--">isInMemory</a></span>()</code>
<div class="block">Determines whether or not the data for this output stream has been
retained in memory.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/commons/io/output/DeferredFileOutputStream.html#thresholdReached--">thresholdReached</a></span>()</code>
<div class="block">Switches the underlying output stream from a memory based stream to one
that is backed by disk.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/commons/io/output/DeferredFileOutputStream.html#writeTo-java.io.OutputStream-">writeTo</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</a> out)</code>
<div class="block">Writes the data from this output stream to the specified output stream,
after it has been closed.</div>
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<h3>Methods inherited from class org.apache.commons.io.output.<a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html" title="class in org.apache.commons.io.output">ThresholdingOutputStream</a></h3>
<code><a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html#checkThreshold-int-">checkThreshold</a>, <a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html#flush--">flush</a>, <a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html#getByteCount--">getByteCount</a>, <a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html#getThreshold--">getThreshold</a>, <a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html#isThresholdExceeded--">isThresholdExceeded</a>, <a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html#resetByteCount--">resetByteCount</a>, <a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html#setByteCount-long-">setByteCount</a>, <a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html#write-byte:A-">write</a>, <a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html#write-byte:A-int-int-">write</a>, <a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html#write-int-">write</a></code></li>
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<h3>Methods inherited from class java.lang.<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></h3>
<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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<h4>DeferredFileOutputStream</h4>
<pre>public DeferredFileOutputStream(int threshold,
<a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> outputFile)</pre>
<div class="block">Constructs an instance of this class which will trigger an event at the
specified threshold, and save data to a file beyond that point.
The initial buffer size will default to 1024 bytes which is ByteArrayOutputStream's default buffer size.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>threshold</code> - The number of bytes at which to trigger an event.</dd>
<dd><code>outputFile</code> - The file to which data is saved beyond the threshold.</dd>
</dl>
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<pre>public DeferredFileOutputStream(int threshold,
int initialBufferSize,
<a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> outputFile)</pre>
<div class="block">Constructs an instance of this class which will trigger an event at the
specified threshold, and save data to a file beyond that point.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>threshold</code> - The number of bytes at which to trigger an event.</dd>
<dd><code>initialBufferSize</code> - The initial size of the in memory buffer.</dd>
<dd><code>outputFile</code> - The file to which data is saved beyond the threshold.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.5</dd>
</dl>
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<pre>public DeferredFileOutputStream(int threshold,
<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> prefix,
<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> suffix,
<a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> directory)</pre>
<div class="block">Constructs an instance of this class which will trigger an event at the
specified threshold, and save data to a temporary file beyond that point.
The initial buffer size will default to 32 bytes which is ByteArrayOutputStream's default buffer size.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>threshold</code> - The number of bytes at which to trigger an event.</dd>
<dd><code>prefix</code> - Prefix to use for the temporary file.</dd>
<dd><code>suffix</code> - Suffix to use for the temporary file.</dd>
<dd><code>directory</code> - Temporary file directory.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.4</dd>
</dl>
</li>
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<pre>public DeferredFileOutputStream(int threshold,
int initialBufferSize,
<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> prefix,
<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> suffix,
<a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> directory)</pre>
<div class="block">Constructs an instance of this class which will trigger an event at the
specified threshold, and save data to a temporary file beyond that point.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>threshold</code> - The number of bytes at which to trigger an event.</dd>
<dd><code>initialBufferSize</code> - The initial size of the in memory buffer.</dd>
<dd><code>prefix</code> - Prefix to use for the temporary file.</dd>
<dd><code>suffix</code> - Suffix to use for the temporary file.</dd>
<dd><code>directory</code> - Temporary file directory.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.5</dd>
</dl>
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<h4>getStream</h4>
<pre>protected <a href="http://docs.oracle.com/javase/7/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</a> getStream()
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">Returns the current output stream. This may be memory based or disk
based, depending on the current state with respect to the threshold.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html#getStream--">getStream</a></code> in class <code><a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html" title="class in org.apache.commons.io.output">ThresholdingOutputStream</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The underlying output stream.</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> - if an error occurs.</dd>
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<h4>thresholdReached</h4>
<pre>protected void thresholdReached()
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">Switches the underlying output stream from a memory based stream to one
that is backed by disk. This is the point at which we realise that too
much data is being written to keep in memory, so we elect to switch to
disk-based storage.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html#thresholdReached--">thresholdReached</a></code> in class <code><a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html" title="class in org.apache.commons.io.output">ThresholdingOutputStream</a></code></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> - if an error occurs.</dd>
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<pre>public boolean isInMemory()</pre>
<div class="block">Determines whether or not the data for this output stream has been
retained in memory.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if the data is available in memory;
<code>false</code> otherwise.</dd>
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<h4>getData</h4>
<pre>public byte[] getData()</pre>
<div class="block">Returns the data for this output stream as an array of bytes, assuming
that the data has been retained in memory. If the data was written to
disk, this method returns <code>null</code>.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The data for this output stream, or <code>null</code> if no such
data is available.</dd>
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<h4>getFile</h4>
<pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> getFile()</pre>
<div class="block">Returns either the output file specified in the constructor or
the temporary file created or null.
<p>
If the constructor specifying the file is used then it returns that
same output file, even when threshold has not been reached.
<p>
If constructor specifying a temporary file prefix/suffix is used
then the temporary file created once the threshold is reached is returned
If the threshold was not reached then <code>null</code> is returned.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The file for this output stream, or <code>null</code> if no such
file exists.</dd>
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<h4>close</h4>
<pre>public void close()
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">Closes underlying output stream, and mark this as closed</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Closeable.html?is-external=true#close--" title="class or interface in java.io">close</a></code> in interface <code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true#close--" title="class or interface in java.lang">close</a></code> in interface <code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html#close--">close</a></code> in class <code><a href="../../../../../org/apache/commons/io/output/ThresholdingOutputStream.html" title="class in org.apache.commons.io.output">ThresholdingOutputStream</a></code></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> - if an error occurs.</dd>
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<h4>writeTo</h4>
<pre>public void writeTo(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</a> out)
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">Writes the data from this output stream to the specified output stream,
after it has been closed.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>out</code> - output stream to write to.</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> - if this stream is not yet closed or an error occurs.</dd>
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