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<div class="subTitle">org.apache.openjpa.persistence.jest</div>
<h2 title="Interface JESTCommand" class="title">Interface JESTCommand</h2>
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<dt>All Known Implementing Classes:</dt>
<dd><a href="../../../../../org/apache/openjpa/persistence/jest/PropertiesCommand.html" title="class in org.apache.openjpa.persistence.jest">PropertiesCommand</a></dd>
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<pre>public interface <span class="typeNameLabel">JESTCommand</span></pre>
<div class="block">Interface for JEST commands. A JEST command denotes a JPA operation such as <code>find</code>,
<code>query</code> or <code>domain</code>. Besides signifying a JPA operation, a command may have
zero or more qualifiers and arguments.
<br>
A qualifier qualifies the action to be performed. For example, a <code>query</code> command may be qualified
to return a single instance as its result, or limit its result to first 20 instances etc.
<br>
An argument is an argument to the target JPA method. For example, <code>find</code> command has
arguments for the type of the instance and the primary key. A <code>query</code> command has the
query string as its argument.
<p>
A concrete command instance is an outcome of parsing a <code>request</code>.
The <code>path</code> segments are parsed for qualifiers.
The <code>query string</code> is parsed for the arguments.
<p>
A JEST command often attaches special semantics to a standard URI syntax. For example, all JEST
URI enforces that the first segment of a servlet path denotes the command moniker e.g. the URI<br>
<code>http://www.jpa.com/jest/find/plan=myPlan?type=Person&1234</code><br>
with context root <code>http://www.jpa.com/jest</code> has the servlet path <code>/find/plan=myPlan</code>
and query string <code>type=Person&1234</code>.
<br>
The first path segment <code>find</code> will determine that the command is to <em>find</em> a
persistent entity of type <code>Person</code> and primary key <code>1234</code> using a fetch plan
named <code>myPlan</code>.</div>
<dl>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Pinaki Poddar</dd>
</dl>
</li>
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<td class="colFirst"><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/jest/JESTCommand.html#getArgument-java.lang.String-">getArgument</a></span>(<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;key)</code>
<div class="block">Get the value of this command's argument of the given name.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/jest/JESTCommand.html#getArguments--">getArguments</a></span>()</code>
<div class="block">Get this command's arguments.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/openjpa/persistence/jest/JPAServletContext.html" title="interface in org.apache.openjpa.persistence.jest">JPAServletContext</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/jest/JESTCommand.html#getExecutionContext--">getExecutionContext</a></span>()</code>
<div class="block">Get the execution context of this command.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/jest/JESTCommand.html#getQualifier-java.lang.String-">getQualifier</a></span>(<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;key)</code>
<div class="block">Get the value of this command's qualifier of the given name.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/jest/JESTCommand.html#getQualifiers--">getQualifiers</a></span>()</code>
<div class="block">Get this command's qualifiers.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/jest/JESTCommand.html#hasArgument-java.lang.String-">hasArgument</a></span>(<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;key)</code>
<div class="block">Affirm this command contains an argument of the given name.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/jest/JESTCommand.html#hasQualifier-java.lang.String-">hasQualifier</a></span>(<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;key)</code>
<div class="block">Affirm this command contains an qualifier of the given name.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/jest/JESTCommand.html#parse--">parse</a></span>()</code>
<div class="block">Parse the given request to populate qualifiers and parameters of this command.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/jest/JESTCommand.html#process--">process</a></span>()</code>
<div class="block">Process the given request and write the output on to the given response in the given context.</div>
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<pre><a href="../../../../../org/apache/openjpa/persistence/jest/JPAServletContext.html" title="interface in org.apache.openjpa.persistence.jest">JPAServletContext</a>&nbsp;getExecutionContext()</pre>
<div class="block">Get the execution context of this command.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the execution context. never null.</dd>
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<h4>parse</h4>
<pre>void&nbsp;parse()
throws <a href="../../../../../org/apache/openjpa/persistence/jest/ProcessingException.html" title="class in org.apache.openjpa.persistence.jest">ProcessingException</a></pre>
<div class="block">Parse the given request to populate qualifiers and parameters of this command.
A command can interpret and consume certain path segments or parameters of the
original request. During <code>processing</code>
phase, the parameters and qualifiers are accessed from the parsed command itself rather than
from the original HTTP request.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/openjpa/persistence/jest/ProcessingException.html" title="class in org.apache.openjpa.persistence.jest">ProcessingException</a></code></dd>
</dl>
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<h4>process</h4>
<pre>void&nbsp;process()
throws <a href="../../../../../org/apache/openjpa/persistence/jest/ProcessingException.html" title="class in org.apache.openjpa.persistence.jest">ProcessingException</a>,
<a href="http://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Process the given request and write the output on to the given response in the given context.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/openjpa/persistence/jest/ProcessingException.html" title="class in org.apache.openjpa.persistence.jest">ProcessingException</a></code></dd>
<dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>getArguments</h4>
<pre><a href="http://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt;&nbsp;getArguments()</pre>
<div class="block">Get this command's arguments.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if accessed prior to parsing.</dd>
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<pre><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;getArgument(<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;key)</pre>
<div class="block">Get the value of this command's argument of the given name.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>null if the argument does not exist.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if accessed prior to parsing.</dd>
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<h4>hasArgument</h4>
<pre>boolean&nbsp;hasArgument(<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;key)</pre>
<div class="block">Affirm this command contains an argument of the given name.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if accessed prior to parsing.</dd>
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<pre><a href="http://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt;&nbsp;getQualifiers()</pre>
<div class="block">Get this command's qualifiers.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if accessed prior to parsing.</dd>
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<pre><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;getQualifier(<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;key)</pre>
<div class="block">Get the value of this command's qualifier of the given name.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>null if the qualifier does not exist.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if accessed prior to parsing.</dd>
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<pre>boolean&nbsp;hasQualifier(<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;key)</pre>
<div class="block">Affirm this command contains an qualifier of the given name.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if accessed prior to parsing.</dd>
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