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<div class="subTitle">org.apache.openjpa.persistence.query</div>
<h2 title="Interface PathExpression" class="title">Interface PathExpression</h2>
</div>
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<dl>
<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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<hr>
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<pre>public interface <span class="strong">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>
</li>
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<h3>Method Summary</h3>
<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span>Methods</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr 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><strong><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#avg()">avg</a></strong>()</code>
<div class="block">Specify that the avg operation is to be applied.</div>
</td>
</tr>
<tr 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><strong><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#count()">count</a></strong>()</code>
<div class="block">Specify that the count operation is to be applied.</div>
</td>
</tr>
<tr 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><strong><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#get(java.lang.String)">get</a></strong>(<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>&nbsp;attributeName)</code>
<div class="block">Return a path expression corresponding to the referenced attribute.</div>
</td>
</tr>
<tr 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><strong><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#isEmpty()">isEmpty</a></strong>()</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>
</td>
</tr>
<tr 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><strong><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#max()">max</a></strong>()</code>
<div class="block">Specify that the max operation is to be applied.</div>
</td>
</tr>
<tr 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><strong><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#min()">min</a></strong>()</code>
<div class="block">Specify that the min operation is to be applied.</div>
</td>
</tr>
<tr 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><strong><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#size()">size</a></strong>()</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 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><strong><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#sum()">sum</a></strong>()</code>
<div class="block">Specify that the sum operation is to be applied.</div>
</td>
</tr>
<tr 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><strong><a href="../../../../../org/apache/openjpa/persistence/query/PathExpression.html#type()">type</a></strong>()</code>
<div class="block">Return an expression that corresponds to the type of the entity.</div>
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<h3>Methods inherited from interface&nbsp;org.apache.openjpa.persistence.query.<a href="../../../../../org/apache/openjpa/persistence/query/Expression.html" title="interface in org.apache.openjpa.persistence.query">Expression</a></h3>
<code><a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#abs()">abs</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#concat(org.apache.openjpa.persistence.query.Expression...)">concat</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#concat(java.lang.String...)">concat</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#dividedBy(org.apache.openjpa.persistence.query.Expression)">dividedBy</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#dividedBy(java.lang.Number)">dividedBy</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#in(java.lang.Class...)">in</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#in(java.lang.Enum...)">in</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#in(org.apache.openjpa.persistence.query.Expression...)">in</a>, <a 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href="../../../../../org/apache/openjpa/persistence/query/Expression.html#minus(org.apache.openjpa.persistence.query.Expression)">minus</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#minus(java.lang.Number)">minus</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#mod(org.apache.openjpa.persistence.query.Expression)">mod</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#mod(int)">mod</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#plus(org.apache.openjpa.persistence.query.Expression)">plus</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#plus(java.lang.Number)">plus</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#sqrt()">sqrt</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#substring(org.apache.openjpa.persistence.query.Expression)">substring</a>, <a 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href="../../../../../org/apache/openjpa/persistence/query/Expression.html#trim()">trim</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#trim(char)">trim</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#trim(char,%20org.apache.openjpa.persistence.query.TrimSpec)">trim</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#trim(org.apache.openjpa.persistence.query.Expression)">trim</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#trim(org.apache.openjpa.persistence.query.Expression,%20org.apache.openjpa.persistence.query.TrimSpec)">trim</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#trim(org.apache.openjpa.persistence.query.TrimSpec)">trim</a>, <a href="../../../../../org/apache/openjpa/persistence/query/Expression.html#upper()">upper</a></code></li>
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<h3>Methods inherited from interface&nbsp;org.apache.openjpa.persistence.query.<a href="../../../../../org/apache/openjpa/persistence/query/SelectItem.html" title="interface in org.apache.openjpa.persistence.query">SelectItem</a></h3>
<code><a href="../../../../../org/apache/openjpa/persistence/query/SelectItem.html#asc()">asc</a>, <a href="../../../../../org/apache/openjpa/persistence/query/SelectItem.html#desc()">desc</a></code></li>
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<h3>Methods inherited from interface&nbsp;org.apache.openjpa.persistence.query.<a href="../../../../../org/apache/openjpa/persistence/query/PredicateOperand.html" title="interface in org.apache.openjpa.persistence.query">PredicateOperand</a></h3>
<code><a href="../../../../../org/apache/openjpa/persistence/query/PredicateOperand.html#between(java.util.Calendar,%20java.util.Calendar)">between</a>, <a href="../../../../../org/apache/openjpa/persistence/query/PredicateOperand.html#between(java.util.Calendar,%20org.apache.openjpa.persistence.query.PredicateOperand)">between</a>, <a href="../../../../../org/apache/openjpa/persistence/query/PredicateOperand.html#between(java.util.Date,%20java.util.Date)">between</a>, <a href="../../../../../org/apache/openjpa/persistence/query/PredicateOperand.html#between(java.util.Date,%20org.apache.openjpa.persistence.query.PredicateOperand)">between</a>, <a href="../../../../../org/apache/openjpa/persistence/query/PredicateOperand.html#between(java.lang.Number,%20java.lang.Number)">between</a>, <a href="../../../../../org/apache/openjpa/persistence/query/PredicateOperand.html#between(java.lang.Number,%20org.apache.openjpa.persistence.query.PredicateOperand)">between</a>, <a 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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://download.oracle.com/javase/6/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="strong">Parameters:</span></dt><dd><code>attributeName</code> - -
name of the referenced attribute</dd>
<dt><span class="strong">Returns:</span></dt><dd>path expression</dd></dl>
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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="strong">Returns:</span></dt><dd>expression denoting the entity's type</dd></dl>
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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="strong">Returns:</span></dt><dd>expression denoting the size</dd></dl>
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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="strong">Returns:</span></dt><dd>predicate corresponding to the restriction</dd></dl>
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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="strong">Returns:</span></dt><dd>the resulting aggregate</dd></dl>
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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>
<dl><dt><span class="strong">Returns:</span></dt><dd>the resulting aggregate</dd></dl>
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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="strong">Returns:</span></dt><dd>the resulting aggregate</dd></dl>
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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;count()</pre>
<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="strong">Returns:</span></dt><dd>the resulting aggregate</dd></dl>
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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="strong">Returns:</span></dt><dd>the resulting aggregate</dd></dl>
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