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| <div class="subTitle">org.apache.openjpa.kernel.exps</div> |
| <h2 title="Interface AggregateListener" class="title">Interface AggregateListener</h2> |
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| <dt>All Superinterfaces:</dt> |
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| <dt>All Known Subinterfaces:</dt> |
| <dd><a href="../../../../../org/apache/openjpa/jdbc/kernel/exps/JDBCAggregateListener.html" title="interface in org.apache.openjpa.jdbc.kernel.exps">JDBCAggregateListener</a></dd> |
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| <br> |
| <pre>public interface <span class="strong">AggregateListener</span> |
| extends <a href="http://download.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre> |
| <div class="block">An aggregate listener aggregates data produced by an ExpressionQuery.</div> |
| <dl><dt><span class="strong">Author:</span></dt> |
| <dd>Abe White, Patrick Linskey</dd></dl> |
| </li> |
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| <caption><span>Methods</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
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| <tr class="altColor"> |
| <td class="colFirst"><code><a href="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/openjpa/kernel/exps/AggregateListener.html#evaluate(java.util.Collection,%20java.lang.Class[],%20java.util.Collection,%20org.apache.openjpa.kernel.StoreContext)">evaluate</a></strong>(<a href="http://download.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a> args, |
| <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>[] argClasses, |
| <a href="http://download.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a> candidates, |
| <a href="../../../../../org/apache/openjpa/kernel/StoreContext.html" title="interface in org.apache.openjpa.kernel">StoreContext</a> ctx)</code> |
| <div class="block">Return the value of this aggregate.</div> |
| </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/openjpa/kernel/exps/AggregateListener.html#expectsArguments()">expectsArguments</a></strong>()</code> |
| <div class="block">Return whether this function expects to act on arguments.</div> |
| </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><code><a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/openjpa/kernel/exps/AggregateListener.html#getTag()">getTag</a></strong>()</code> |
| <div class="block">Return the tag that this listener listens for.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/openjpa/kernel/exps/AggregateListener.html#getType(java.lang.Class[])">getType</a></strong>(<a href="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>[] argClasses)</code> |
| <div class="block">Return the expected type of the result of this listener.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
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| <h3>Method Detail</h3> |
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| <h4>getTag</h4> |
| <pre><a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> getTag()</pre> |
| <div class="block">Return the tag that this listener listens for.</div> |
| </li> |
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| <h4>expectsArguments</h4> |
| <pre>boolean expectsArguments()</pre> |
| <div class="block">Return whether this function expects to act on arguments. Some |
| function may not need arguments; for example, a function to count the |
| number of objects that match a given filter might be of the form: |
| <code>count()</code>.</div> |
| </li> |
| </ul> |
| <a name="evaluate(java.util.Collection, java.lang.Class[], java.util.Collection, org.apache.openjpa.kernel.StoreContext)"> |
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| <h4>evaluate</h4> |
| <pre><a href="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> evaluate(<a href="http://download.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a> args, |
| <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>[] argClasses, |
| <a href="http://download.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a> candidates, |
| <a href="../../../../../org/apache/openjpa/kernel/StoreContext.html" title="interface in org.apache.openjpa.kernel">StoreContext</a> ctx)</pre> |
| <div class="block">Return the value of this aggregate.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>args</code> - for each candidate, the value of the arguments to |
| the function; will be null if this aggregate does |
| not expect an argument; if this function has |
| multiple arguments, each element will be an array</dd><dd><code>argClasses</code> - the expected class of each argument element</dd><dd><code>candidates</code> - the candidate objects being evaluated</dd><dd><code>ctx</code> - the persistence context</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>the value of the aggregate</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/openjpa/util/UserException.html" title="class in org.apache.openjpa.util">UserException</a></code> - if this aggregate does not |
| support in-memory operation</dd></dl> |
| </li> |
| </ul> |
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| <h4>getType</h4> |
| <pre><a href="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a> getType(<a href="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>[] argClasses)</pre> |
| <div class="block">Return the expected type of the result of this listener.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>argClasses</code> - the expected classes of the argument, or null if |
| no arguments</dd></dl> |
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