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<div class="subTitle">org.apache.openjpa.persistence.query</div>
<h2 title="Interface PathExpression" class="title">Interface PathExpression</h2>
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<dt>All Superinterfaces:</dt>
<dd><a href="../../../../../org/apache/openjpa/persistence/query/Expression.html" title="interface in org.apache.openjpa.persistence.query">Expression</a>, <a href="../../../../../org/apache/openjpa/persistence/query/OrderByItem.html" title="interface in org.apache.openjpa.persistence.query">OrderByItem</a>, <a href="../../../../../org/apache/openjpa/persistence/query/PredicateOperand.html" title="interface in org.apache.openjpa.persistence.query">PredicateOperand</a>, <a href="../../../../../org/apache/openjpa/persistence/query/SelectItem.html" title="interface in org.apache.openjpa.persistence.query">SelectItem</a></dd>
</dl>
<dl>
<dt>All Known Subinterfaces:</dt>
<dd><a href="../../../../../org/apache/openjpa/persistence/query/DomainObject.html" title="interface in org.apache.openjpa.persistence.query">DomainObject</a></dd>
</dl>
<dl>
<dt>All Known Implementing Classes:</dt>
<dd><a href="../../../../../org/apache/openjpa/persistence/query/AbstractDomainObject.html" title="class in org.apache.openjpa.persistence.query">AbstractDomainObject</a>, <a href="../../../../../org/apache/openjpa/persistence/query/EntryExpression.html" title="class in org.apache.openjpa.persistence.query">EntryExpression</a>, <a href="../../../../../org/apache/openjpa/persistence/query/FetchPath.html" title="class in org.apache.openjpa.persistence.query">FetchPath</a>, <a href="../../../../../org/apache/openjpa/persistence/query/JoinPath.html" title="class in org.apache.openjpa.persistence.query">JoinPath</a>, <a href="../../../../../org/apache/openjpa/persistence/query/KeyExpression.html" title="class in org.apache.openjpa.persistence.query">KeyExpression</a>, <a href="../../../../../org/apache/openjpa/persistence/query/OperatorPath.html" title="class in org.apache.openjpa.persistence.query">OperatorPath</a>, <a href="../../../../../org/apache/openjpa/persistence/query/RootPath.html" title="class in org.apache.openjpa.persistence.query">RootPath</a>, <a href="../../../../../org/apache/openjpa/persistence/query/ValueExpression.html" title="class in org.apache.openjpa.persistence.query">ValueExpression</a></dd>
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<pre>public interface <span class="typeNameLabel">PathExpression</span>
extends <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html" title="interface in org.apache.openjpa.persistence.query">Expression</a></pre>
<div class="block">Interface for operations over objects reached via paths</div>
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<h3>Method Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<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="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/openjpa/persistence/query/Aggregate.html" title="interface in org.apache.openjpa.persistence.query">Aggregate</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#avg--">avg</a></span>()</code>
<div class="block">Specify that the avg operation is to be applied.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/openjpa/persistence/query/Aggregate.html" title="interface in org.apache.openjpa.persistence.query">Aggregate</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#count--">count</a></span>()</code>
<div class="block">Specify that the count operation is to be applied.</div>
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<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html" title="interface in org.apache.openjpa.persistence.query">PathExpression</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#get-java.lang.String-">get</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;attributeName)</code>
<div class="block">Return a path expression corresponding to the referenced attribute.</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/openjpa/persistence/query/Predicate.html" title="interface in org.apache.openjpa.persistence.query">Predicate</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#isEmpty--">isEmpty</a></span>()</code>
<div class="block">Add a restriction that the path expression must correspond to an
association or element collection that is empty (has no elements).</div>
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<td class="colFirst"><code><a href="../../../../../org/apache/openjpa/persistence/query/Aggregate.html" title="interface in org.apache.openjpa.persistence.query">Aggregate</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#max--">max</a></span>()</code>
<div class="block">Specify that the max operation is to be applied.</div>
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<td class="colFirst"><code><a href="../../../../../org/apache/openjpa/persistence/query/Aggregate.html" title="interface in org.apache.openjpa.persistence.query">Aggregate</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#min--">min</a></span>()</code>
<div class="block">Specify that the min operation is to be applied.</div>
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<td class="colFirst"><code><a href="../../../../../org/apache/openjpa/persistence/query/Expression.html" title="interface in org.apache.openjpa.persistence.query">Expression</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#size--">size</a></span>()</code>
<div class="block">Return an expression that corresponds to the number of elements
association or element collection corresponding to the path expression.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/openjpa/persistence/query/Aggregate.html" title="interface in org.apache.openjpa.persistence.query">Aggregate</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#sum--">sum</a></span>()</code>
<div class="block">Specify that the sum operation is to be applied.</div>
</td>
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<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/openjpa/persistence/query/Expression.html" title="interface in org.apache.openjpa.persistence.query">Expression</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#type--">type</a></span>()</code>
<div class="block">Return an expression that corresponds to the type of the entity.</div>
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<pre><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html" title="interface in org.apache.openjpa.persistence.query">PathExpression</a>&nbsp;get(<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;attributeName)</pre>
<div class="block">Return a path expression corresponding to the referenced attribute. It is
not permitted to invoke this method on a path expression that corresponds
to a multi-valued association or element collection. The path expression
on which this method is invoked must correspond to a class containing the
referenced attribute.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>attributeName</code> - -
name of the referenced attribute</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>path expression</dd>
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<pre><a href="../../../../../org/apache/openjpa/persistence/query/Expression.html" title="interface in org.apache.openjpa.persistence.query">Expression</a>&nbsp;type()</pre>
<div class="block">Return an expression that corresponds to the type of the entity. This
method can only be invoked on a path expression corresponding to an
entity. It is not permitted to invoke this method on a path expression
that corresponds to a multi-valued association.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
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<pre><a href="../../../../../org/apache/openjpa/persistence/query/Expression.html" title="interface in org.apache.openjpa.persistence.query">Expression</a>&nbsp;size()</pre>
<div class="block">Return an expression that corresponds to the number of elements
association or element collection corresponding to the path expression.
This method can only be invoked on a path expression that corresponds to
a multi-valued association or to an element collection.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
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<pre><a href="../../../../../org/apache/openjpa/persistence/query/Predicate.html" title="interface in org.apache.openjpa.persistence.query">Predicate</a>&nbsp;isEmpty()</pre>
<div class="block">Add a restriction that the path expression must correspond to an
association or element collection that is empty (has no elements). This
method can only be invoked on a path expression that corresponds to a
multi-valued association or to an element collection.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
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<pre><a href="../../../../../org/apache/openjpa/persistence/query/Aggregate.html" title="interface in org.apache.openjpa.persistence.query">Aggregate</a>&nbsp;avg()</pre>
<div class="block">Specify that the avg operation is to be applied. The path expression must
correspond to an attribute of a numeric type. It is not permitted to
invoke this method on a path expression that corresponds to a
multi-valued association or element collection.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
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<pre><a href="../../../../../org/apache/openjpa/persistence/query/Aggregate.html" title="interface in org.apache.openjpa.persistence.query">Aggregate</a>&nbsp;max()</pre>
<div class="block">Specify that the max operation is to be applied. The path expression must
correspond to an attribute of an orderable type. It is not permitted to
invoke this method on a path expression that corresponds to a
multi-valued association or element collection.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
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<pre><a href="../../../../../org/apache/openjpa/persistence/query/Aggregate.html" title="interface in org.apache.openjpa.persistence.query">Aggregate</a>&nbsp;min()</pre>
<div class="block">Specify that the min operation is to be applied. The path expression must
correspond to an attribute of an orderable type. It is not permitted to
invoke this method on a path expression that corresponds to a
multi-valued association or element collection.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
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<div class="block">Specify that the count operation is to be applied. It is not permitted to
invoke this method on a path expression that corresponds to a
multi-valued association or element collection.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
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<pre><a href="../../../../../org/apache/openjpa/persistence/query/Aggregate.html" title="interface in org.apache.openjpa.persistence.query">Aggregate</a>&nbsp;sum()</pre>
<div class="block">Specify that the sum operation is to be applied. The path expression must
correspond to an attribute of a numeric type. It is not permitted to
invoke this method on a path expression that corresponds to a
multi-valued association or element collection.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
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