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<div class="subTitle">freemarker.cache</div>
<h2 title="Class StringTemplateLoader" class="title">Class StringTemplateLoader</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>freemarker.cache.StringTemplateLoader</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../freemarker/cache/TemplateLoader.html" title="interface in freemarker.cache">TemplateLoader</a></dd>
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<br>
<pre>public class <span class="typeNameLabel">StringTemplateLoader</span>
extends java.lang.Object
implements <a href="../../freemarker/cache/TemplateLoader.html" title="interface in freemarker.cache">TemplateLoader</a></pre>
<div class="block">A <a href="../../freemarker/cache/TemplateLoader.html" title="interface in freemarker.cache"><code>TemplateLoader</code></a> that uses a <code>Map</code> with <code>String</code>-s as its source of
templates.
<p>In most case the regular way of loading templates from files will be fine.
However, there can be situations where you don't want to or can't load a
template from a file, e.g. if you have to deploy a single jar for
JavaWebStart or if they are contained within a database.
A single template can be created manually
e.g.
<pre>
String templateStr="Hello ${user}";
Template t = new Template("name", new StringReader(templateStr),
new Configuration());
</pre>
<p>If, however, you want to create templates from strings which import other
templates this method doesn't work.
<p>In that case you can create a StringTemplateLoader and add each template to
it:
<pre>
StringTemplateLoader stringLoader = new StringTemplateLoader();
stringLoader.putTemplate("greetTemplate", "&lt;#macro greet&gt;Hello&lt;/#macro&gt;");
stringLoader.putTemplate("myTemplate", "&lt;#include \"greetTemplate\"&gt;&lt;@greet/&gt; World!");
</pre>
<p>Then you tell your Configuration object to use it:
<pre>
cfg.setTemplateLoader(stringLoader);
</pre>
<p>After that you should be able to use the templates as usual. Often you will
want to combine a <tt>StringTemplateLoader</tt> with another loader. You can
do so using a <a href="../../freemarker/cache/MultiTemplateLoader.html" title="class in freemarker.cache"><code>MultiTemplateLoader</code></a>.</div>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../freemarker/cache/StringTemplateLoader.html#StringTemplateLoader--">StringTemplateLoader</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="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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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="../../freemarker/cache/StringTemplateLoader.html#closeTemplateSource-java.lang.Object-">closeTemplateSource</a></span>(java.lang.Object&nbsp;templateSource)</code>
<div class="block">Closes the template source, releasing any resources held that are only required for reading the template and/or
its metadata.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../freemarker/cache/StringTemplateLoader.html#findTemplateSource-java.lang.String-">findTemplateSource</a></span>(java.lang.String&nbsp;name)</code>
<div class="block">Finds the template in the backing storage and returns an object that identifies the storage location where the
template can be loaded from.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../freemarker/cache/StringTemplateLoader.html#getLastModified-java.lang.Object-">getLastModified</a></span>(java.lang.Object&nbsp;templateSource)</code>
<div class="block">Returns the time of last modification of the specified template source.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>java.io.Reader</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../freemarker/cache/StringTemplateLoader.html#getReader-java.lang.Object-java.lang.String-">getReader</a></span>(java.lang.Object&nbsp;templateSource,
java.lang.String&nbsp;encoding)</code>
<div class="block">Returns the character stream of a template represented by the specified template source.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../freemarker/cache/StringTemplateLoader.html#putTemplate-java.lang.String-java.lang.String-">putTemplate</a></span>(java.lang.String&nbsp;name,
java.lang.String&nbsp;templateContent)</code>
<div class="block">Puts a template into the loader.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../freemarker/cache/StringTemplateLoader.html#putTemplate-java.lang.String-java.lang.String-long-">putTemplate</a></span>(java.lang.String&nbsp;name,
java.lang.String&nbsp;templateContent,
long&nbsp;lastModified)</code>
<div class="block">Puts a template into the loader.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../freemarker/cache/StringTemplateLoader.html#removeTemplate-java.lang.String-">removeTemplate</a></span>(java.lang.String&nbsp;name)</code>
<div class="block">Removes the template with the specified name if it was added earlier.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../freemarker/cache/StringTemplateLoader.html#toString--">toString</a></span>()</code>
<div class="block">Show class name and some details that are useful in template-not-found errors.</div>
</td>
</tr>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
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<h4>StringTemplateLoader</h4>
<pre>public&nbsp;StringTemplateLoader()</pre>
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<h4>putTemplate</h4>
<pre>public&nbsp;void&nbsp;putTemplate(java.lang.String&nbsp;name,
java.lang.String&nbsp;templateContent)</pre>
<div class="block">Puts a template into the loader. A call to this method is identical to
the call to the three-arg <a href="../../freemarker/cache/StringTemplateLoader.html#putTemplate-java.lang.String-java.lang.String-long-"><code>putTemplate(String, String, long)</code></a>
passing <tt>System.currentTimeMillis()</tt> as the third argument.
<p>Note that this method is not thread safe! Don't call it after FreeMarker has started using this template
loader.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - the name of the template.</dd>
<dd><code>templateContent</code> - the source code of the template.</dd>
</dl>
</li>
</ul>
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<h4>putTemplate</h4>
<pre>public&nbsp;void&nbsp;putTemplate(java.lang.String&nbsp;name,
java.lang.String&nbsp;templateContent,
long&nbsp;lastModified)</pre>
<div class="block">Puts a template into the loader. The name can contain slashes to denote
logical directory structure, but must not start with a slash. If the
method is called multiple times for the same name and with different
last modified time, the configuration's template cache will reload the
template according to its own refresh settings (note that if the refresh
is disabled in the template cache, the template will not be reloaded).
Also, since the cache uses lastModified to trigger reloads, calling the
method with different source and identical timestamp won't trigger
reloading.
<p>Note that this method is not thread safe! Don't call it after FreeMarker has started using this template
loader.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - the name of the template.</dd>
<dd><code>templateContent</code> - the source code of the template.</dd>
<dd><code>lastModified</code> - the time of last modification of the template in
terms of <tt>System.currentTimeMillis()</tt></dd>
</dl>
</li>
</ul>
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<h4>removeTemplate</h4>
<pre>public&nbsp;boolean&nbsp;removeTemplate(java.lang.String&nbsp;name)</pre>
<div class="block">Removes the template with the specified name if it was added earlier.
<p>Note that this method is not thread safe! Don't call it after FreeMarker has started using this template
loader.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - Exactly the key with which the template was added.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Whether a template was found with the given key (and hence was removed now)</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.3.24</dd>
</dl>
</li>
</ul>
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<h4>closeTemplateSource</h4>
<pre>public&nbsp;void&nbsp;closeTemplateSource(java.lang.Object&nbsp;templateSource)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../freemarker/cache/TemplateLoader.html#closeTemplateSource-java.lang.Object-">TemplateLoader</a></code></span></div>
<div class="block">Closes the template source, releasing any resources held that are only required for reading the template and/or
its metadata. This is the last method that is called by the <a href="../../freemarker/cache/TemplateCache.html" title="class in freemarker.cache"><code>TemplateCache</code></a> for a template source, except
that <code>Object.equals(Object)</code> is might called later too. <a href="../../freemarker/cache/TemplateCache.html" title="class in freemarker.cache"><code>TemplateCache</code></a> ensures that this method will
be called on every object that is returned from <a href="../../freemarker/cache/TemplateLoader.html#findTemplateSource-java.lang.String-"><code>TemplateLoader.findTemplateSource(String)</code></a>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../freemarker/cache/TemplateLoader.html#closeTemplateSource-java.lang.Object-">closeTemplateSource</a></code>&nbsp;in interface&nbsp;<code><a href="../../freemarker/cache/TemplateLoader.html" title="interface in freemarker.cache">TemplateLoader</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>templateSource</code> - the template source that should be closed.</dd>
</dl>
</li>
</ul>
<a name="findTemplateSource-java.lang.String-">
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<h4>findTemplateSource</h4>
<pre>public&nbsp;java.lang.Object&nbsp;findTemplateSource(java.lang.String&nbsp;name)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../freemarker/cache/TemplateLoader.html#findTemplateSource-java.lang.String-">TemplateLoader</a></code></span></div>
<div class="block">Finds the template in the backing storage and returns an object that identifies the storage location where the
template can be loaded from. See the return value for more information.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../freemarker/cache/TemplateLoader.html#findTemplateSource-java.lang.String-">findTemplateSource</a></code>&nbsp;in interface&nbsp;<code><a href="../../freemarker/cache/TemplateLoader.html" title="interface in freemarker.cache">TemplateLoader</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - The name (template root directory relative path) of the template, already localized and normalized by
the <a href="../../freemarker/cache/TemplateCache.html" title="class in freemarker.cache"><code>cache</code></a>. It is completely up to the loader implementation to
interpret the name, however it should expect to receive hierarchical paths where path components are
separated by a slash (not backslash). Backslashes (or any other OS specific separator character) are
not considered as separators by FreeMarker, and thus they will not be replaced with slash before
passing to this method, so it's up to the template loader to handle them (say, by throwing an
exception that tells the user that the path (s)he has entered is invalid, as (s)he must use slash --
typical mistake of Windows users). The passed names are always considered relative to some
loader-defined root location (often referred as the "template root directory"), and will never start
with a slash, nor will they contain a path component consisting of either a single or a double dot --
these are all resolved by the template cache before passing the name to the loader. As a side effect,
paths that trivially reach outside template root directory, such as <tt>../my.ftl</tt>, will be
rejected by the template cache, so they never reach the template loader. Note again, that if the path
uses backslash as path separator instead of slash as (the template loader should not accept that), the
normalization will not properly happen, as FreeMarker (the cache) recognizes only the slashes as
separators.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>An object representing the template source, which can be supplied in subsequent calls to
<a href="../../freemarker/cache/TemplateLoader.html#getLastModified-java.lang.Object-"><code>TemplateLoader.getLastModified(Object)</code></a> and <a href="../../freemarker/cache/TemplateLoader.html#getReader-java.lang.Object-java.lang.String-"><code>TemplateLoader.getReader(Object, String)</code></a>, when those are called on the
same <a href="../../freemarker/cache/TemplateLoader.html" title="interface in freemarker.cache"><code>TemplateLoader</code></a>. <code>null</code> must be returned if the source for the template doesn't exist;
don't throw exception then! The exact type of this object is up to the <a href="../../freemarker/cache/TemplateLoader.html" title="interface in freemarker.cache"><code>TemplateLoader</code></a>
implementation. As this object is possibly used as hash key in caches, and is surly compared with another
template source for equality, <b>it must have a proper <code>Object.equals(Object)</code> and
<code>Object.hashCode()</code>) implementation</b>. Especially, template sources that refer to the same
physical source must be equivalent, otherwise template caching can become inefficient. This is only
expected from <code>Object.equals(Object)</code> when the compared template sources came from the same
<a href="../../freemarker/cache/TemplateLoader.html" title="interface in freemarker.cache"><code>TemplateLoader</code></a> instance. Also, it must not influence the equality if the source is open or
closed (<a href="../../freemarker/cache/TemplateLoader.html#closeTemplateSource-java.lang.Object-"><code>TemplateLoader.closeTemplateSource(Object)</code></a>).</dd>
</dl>
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<h4>getLastModified</h4>
<pre>public&nbsp;long&nbsp;getLastModified(java.lang.Object&nbsp;templateSource)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../freemarker/cache/TemplateLoader.html#getLastModified-java.lang.Object-">TemplateLoader</a></code></span></div>
<div class="block">Returns the time of last modification of the specified template source. This method is called after
<code>findTemplateSource()</code>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../freemarker/cache/TemplateLoader.html#getLastModified-java.lang.Object-">getLastModified</a></code>&nbsp;in interface&nbsp;<code><a href="../../freemarker/cache/TemplateLoader.html" title="interface in freemarker.cache">TemplateLoader</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>templateSource</code> - an object representing a template source (the template file), obtained through a prior call to
<a href="../../freemarker/cache/TemplateLoader.html#findTemplateSource-java.lang.String-"><code>TemplateLoader.findTemplateSource(String)</code></a>. This must be an object on which
<a href="../../freemarker/cache/TemplateLoader.html#closeTemplateSource-java.lang.Object-"><code>TemplateLoader.closeTemplateSource(Object)</code></a> wasn't applied yet.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The time of last modification for the specified template source, or -1 if the time is not known. This
value meant to be milliseconds since the epoch, but in fact FreeMarker doesn't care what it means, it
only cares if it changes, in which case the template needs to be reloaded (even if the value has
decreased). -1 is not special in that regard either; if you keep returning it, FreeMarker won't
reload the template (as far as it's not evicted from the cache from some other
reason). Note that <code>Long.MIN_VALUE</code> is reserved for internal use.</dd>
</dl>
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<h4>getReader</h4>
<pre>public&nbsp;java.io.Reader&nbsp;getReader(java.lang.Object&nbsp;templateSource,
java.lang.String&nbsp;encoding)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../freemarker/cache/TemplateLoader.html#getReader-java.lang.Object-java.lang.String-">TemplateLoader</a></code></span></div>
<div class="block">Returns the character stream of a template represented by the specified template source. This method is possibly
called for multiple times for the same template source object, and it must always return a <code>Reader</code> that
reads the template from its beginning. Before this method is called for the second time (or later), its caller
must close the previously returned <code>Reader</code>, and it must not use it anymore. That is, this method is not
required to support multiple concurrent readers for the same source <code>templateSource</code> object.
<p>
Typically, this method is called if the template is missing from the cache, or if after calling
<a href="../../freemarker/cache/TemplateLoader.html#findTemplateSource-java.lang.String-"><code>TemplateLoader.findTemplateSource(String)</code></a> and <a href="../../freemarker/cache/TemplateLoader.html#getLastModified-java.lang.Object-"><code>TemplateLoader.getLastModified(Object)</code></a> it was determined that the cached copy
of the template is stale. Then, if it turns out that the <code>encoding</code> parameter used doesn't match the actual
template content (based on the <code>#ftl encoding=...</code> header), this method will be called for a second time
with the correct <code>encoding</code> parameter value.
<p>
Unlike <a href="../../freemarker/cache/TemplateLoader.html#findTemplateSource-java.lang.String-"><code>TemplateLoader.findTemplateSource(String)</code></a>, this method must not tolerate if the template is not found, and
must throw <code>IOException</code> in that case.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../freemarker/cache/TemplateLoader.html#getReader-java.lang.Object-java.lang.String-">getReader</a></code>&nbsp;in interface&nbsp;<code><a href="../../freemarker/cache/TemplateLoader.html" title="interface in freemarker.cache">TemplateLoader</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>templateSource</code> - an object representing a template source, obtained through a prior call to
<a href="../../freemarker/cache/TemplateLoader.html#findTemplateSource-java.lang.String-"><code>TemplateLoader.findTemplateSource(String)</code></a>. This must be an object on which
<a href="../../freemarker/cache/TemplateLoader.html#closeTemplateSource-java.lang.Object-"><code>TemplateLoader.closeTemplateSource(Object)</code></a> wasn't applied yet.</dd>
<dd><code>encoding</code> - the character encoding used to translate source bytes to characters. Some loaders may not have access
to the byte representation of the template stream, and instead directly obtain a character stream.
These loaders should ignore the encoding parameter.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A <code>Reader</code> representing the template character stream; not <code>null</code>. It's the responsibility of
the caller (which is <a href="../../freemarker/cache/TemplateCache.html" title="class in freemarker.cache"><code>TemplateCache</code></a> usually) to <code>close()</code> it. The <code>Reader</code> is not
required to work after the <code>templateSource</code> was closed (<a href="../../freemarker/cache/TemplateLoader.html#closeTemplateSource-java.lang.Object-"><code>TemplateLoader.closeTemplateSource(Object)</code></a>).</dd>
</dl>
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<h4>toString</h4>
<pre>public&nbsp;java.lang.String&nbsp;toString()</pre>
<div class="block">Show class name and some details that are useful in template-not-found errors.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>toString</code>&nbsp;in class&nbsp;<code>java.lang.Object</code></dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.3.21</dd>
</dl>
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