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| <div class="subTitle">org.apache.openjpa.jdbc.kernel.exps</div> |
| <h2 title="Class GetColumn" class="title">Class GetColumn</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><a href="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.openjpa.jdbc.kernel.exps.GetColumn</li> |
| </ul> |
| </li> |
| </ul> |
| <div class="description"> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><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>, <a href="../../../../../../org/apache/openjpa/jdbc/kernel/exps/JDBCFilterListener.html" title="interface in org.apache.openjpa.jdbc.kernel.exps">JDBCFilterListener</a>, <a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html" title="interface in org.apache.openjpa.kernel.exps">FilterListener</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public class <span class="strong">GetColumn</span> |
| extends <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> |
| implements <a href="../../../../../../org/apache/openjpa/jdbc/kernel/exps/JDBCFilterListener.html" title="interface in org.apache.openjpa.jdbc.kernel.exps">JDBCFilterListener</a></pre> |
| <div class="block">Returns the SQL alias of the named column for use in a query. Note that |
| to retrieve columns in the table of the candidate object, you must |
| explicitly qualify the extension with <code>this</code>, as demonstrated |
| in the second example below. |
| Examples:<br /> |
| <code> "company.address.ext:getColumn (\"ID\") == 5"<br /> |
| "this.ext:getColumn (\"CLS\") == \"org.apache.openjpa.example.Person\"" |
| </code></div> |
| <dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../../serialized-form.html#org.apache.openjpa.jdbc.kernel.exps.GetColumn">Serialized Form</a></dd></dl> |
| </li> |
| </ul> |
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| <td class="colFirst"><code>static <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/jdbc/kernel/exps/GetColumn.html#TAG">TAG</a></strong></code> </td> |
| </tr> |
| </table> |
| </li> |
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| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><strong><a href="../../../../../../org/apache/openjpa/jdbc/kernel/exps/GetColumn.html#GetColumn()">GetColumn</a></strong>()</code> </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
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| <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>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../../org/apache/openjpa/jdbc/kernel/exps/GetColumn.html#appendTo(org.apache.openjpa.jdbc.sql.SQLBuffer,%20org.apache.openjpa.jdbc.kernel.exps.FilterValue,%20org.apache.openjpa.jdbc.kernel.exps.FilterValue[],%20org.apache.openjpa.jdbc.meta.ClassMapping,%20org.apache.openjpa.jdbc.kernel.JDBCStore)">appendTo</a></strong>(<a href="../../../../../../org/apache/openjpa/jdbc/sql/SQLBuffer.html" title="class in org.apache.openjpa.jdbc.sql">SQLBuffer</a> buf, |
| <a href="../../../../../../org/apache/openjpa/jdbc/kernel/exps/FilterValue.html" title="interface in org.apache.openjpa.jdbc.kernel.exps">FilterValue</a> target, |
| <a href="../../../../../../org/apache/openjpa/jdbc/kernel/exps/FilterValue.html" title="interface in org.apache.openjpa.jdbc.kernel.exps">FilterValue</a>[] args, |
| <a href="../../../../../../org/apache/openjpa/jdbc/meta/ClassMapping.html" title="class in org.apache.openjpa.jdbc.meta">ClassMapping</a> type, |
| <a href="../../../../../../org/apache/openjpa/jdbc/kernel/JDBCStore.html" title="interface in org.apache.openjpa.jdbc.kernel">JDBCStore</a> store)</code> |
| <div class="block">Append the SQL for this expression or value.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <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/jdbc/kernel/exps/GetColumn.html#evaluate(java.lang.Object,%20java.lang.Class,%20java.lang.Object[],%20java.lang.Class[],%20java.lang.Object,%20org.apache.openjpa.kernel.StoreContext)">evaluate</a></strong>(<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> target, |
| <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> targetClass, |
| <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>[] 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/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> candidate, |
| <a href="../../../../../../org/apache/openjpa/kernel/StoreContext.html" title="interface in org.apache.openjpa.kernel">StoreContext</a> ctx)</code> |
| <div class="block">Evaluate the given expression.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../../org/apache/openjpa/jdbc/kernel/exps/GetColumn.html#expectsArguments()">expectsArguments</a></strong>()</code> |
| <div class="block">Return true if this extension expects arguments to act on.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../../org/apache/openjpa/jdbc/kernel/exps/GetColumn.html#expectsTarget()">expectsTarget</a></strong>()</code> |
| <div class="block">Return true if this extension expects a target to act on.</div> |
| </td> |
| </tr> |
| <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/jdbc/kernel/exps/GetColumn.html#getTag()">getTag</a></strong>()</code> |
| <div class="block">Return the tag that this extension 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/jdbc/kernel/exps/GetColumn.html#getType(java.lang.Class,%20java.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> targetClass, |
| <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> |
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| <h3>Methods inherited from class java.lang.<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></h3> |
| <code><a href="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="field_detail"> |
| <!-- --> |
| </a> |
| <h3>Field Detail</h3> |
| <a name="TAG"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>TAG</h4> |
| <pre>public static final <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> TAG</pre> |
| <dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../../constant-values.html#org.apache.openjpa.jdbc.kernel.exps.GetColumn.TAG">Constant Field Values</a></dd></dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor_detail"> |
| <!-- --> |
| </a> |
| <h3>Constructor Detail</h3> |
| <a name="GetColumn()"> |
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| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>GetColumn</h4> |
| <pre>public GetColumn()</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method_detail"> |
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| </a> |
| <h3>Method Detail</h3> |
| <a name="getTag()"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getTag</h4> |
| <pre>public <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"><strong>Description copied from interface: <code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html#getTag()">FilterListener</a></code></strong></div> |
| <div class="block">Return the tag that this extension listens for.</div> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html#getTag()">getTag</a></code> in interface <code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html" title="interface in org.apache.openjpa.kernel.exps">FilterListener</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="expectsArguments()"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>expectsArguments</h4> |
| <pre>public boolean expectsArguments()</pre> |
| <div class="block"><strong>Description copied from interface: <code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html#expectsArguments()">FilterListener</a></code></strong></div> |
| <div class="block">Return true if this extension expects arguments to act on. Some |
| extensions may not need arguments; for example, an extension to |
| switch a string to upper case might be of the form: |
| <code>field.ext:toUpperCase ()</code>.</div> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html#expectsArguments()">expectsArguments</a></code> in interface <code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html" title="interface in org.apache.openjpa.kernel.exps">FilterListener</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="expectsTarget()"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>expectsTarget</h4> |
| <pre>public boolean expectsTarget()</pre> |
| <div class="block"><strong>Description copied from interface: <code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html#expectsTarget()">FilterListener</a></code></strong></div> |
| <div class="block">Return true if this extension expects a target to act on. Some |
| extensions act on a field or object value; others stand alone. |
| <code>field.ext:toUpperCase ()</code> acts on the target |
| <code>field</code> but has no arguments, while another possible form, |
| <code>ext:toUpperCase (field)</code> has no target but does have an |
| argument.</div> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html#expectsTarget()">expectsTarget</a></code> in interface <code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html" title="interface in org.apache.openjpa.kernel.exps">FilterListener</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="evaluate(java.lang.Object, java.lang.Class, java.lang.Object[], java.lang.Class[], java.lang.Object, org.apache.openjpa.kernel.StoreContext)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>evaluate</h4> |
| <pre>public <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/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> target, |
| <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> targetClass, |
| <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>[] 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/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> candidate, |
| <a href="../../../../../../org/apache/openjpa/kernel/StoreContext.html" title="interface in org.apache.openjpa.kernel">StoreContext</a> ctx)</pre> |
| <div class="block"><strong>Description copied from interface: <code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html#evaluate(java.lang.Object,%20java.lang.Class,%20java.lang.Object[],%20java.lang.Class[],%20java.lang.Object,%20org.apache.openjpa.kernel.StoreContext)">FilterListener</a></code></strong></div> |
| <div class="block">Evaluate the given expression. This method is used when |
| evaluating in-memory expressions. The method used when evaluating |
| data store expressions will change depending on the data store in use.</div> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html#evaluate(java.lang.Object,%20java.lang.Class,%20java.lang.Object[],%20java.lang.Class[],%20java.lang.Object,%20org.apache.openjpa.kernel.StoreContext)">evaluate</a></code> in interface <code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html" title="interface in org.apache.openjpa.kernel.exps">FilterListener</a></code></dd> |
| <dt><span class="strong">Parameters:</span></dt><dd><code>target</code> - the target object / field value to act on; will be |
| null if this extension does not expect a target</dd><dd><code>targetClass</code> - the expected class of the target; given in case |
| the target evaluates to null and typing is needed</dd><dd><code>args</code> - the values of the arguments given in the filter; |
| will be null if this extension does not expect an argument</dd><dd><code>argClasses</code> - the expected classes of the arguments; given in case |
| an argument evaluates to null and typing is needed</dd><dd><code>candidate</code> - the candidate object being evaluated</dd><dd><code>ctx</code> - the persistence context</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>the value of the extension for this candidate; if |
| this extension is an expression, this method should |
| return <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Boolean.html?is-external=true#TRUE" title="class or interface in java.lang"><code>Boolean.TRUE</code></a> or <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Boolean.html?is-external=true#FALSE" title="class or interface in java.lang"><code>Boolean.FALSE</code></a></dd></dl> |
| </li> |
| </ul> |
| <a name="appendTo(org.apache.openjpa.jdbc.sql.SQLBuffer, org.apache.openjpa.jdbc.kernel.exps.FilterValue, org.apache.openjpa.jdbc.kernel.exps.FilterValue[], org.apache.openjpa.jdbc.meta.ClassMapping, org.apache.openjpa.jdbc.kernel.JDBCStore)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>appendTo</h4> |
| <pre>public void appendTo(<a href="../../../../../../org/apache/openjpa/jdbc/sql/SQLBuffer.html" title="class in org.apache.openjpa.jdbc.sql">SQLBuffer</a> buf, |
| <a href="../../../../../../org/apache/openjpa/jdbc/kernel/exps/FilterValue.html" title="interface in org.apache.openjpa.jdbc.kernel.exps">FilterValue</a> target, |
| <a href="../../../../../../org/apache/openjpa/jdbc/kernel/exps/FilterValue.html" title="interface in org.apache.openjpa.jdbc.kernel.exps">FilterValue</a>[] args, |
| <a href="../../../../../../org/apache/openjpa/jdbc/meta/ClassMapping.html" title="class in org.apache.openjpa.jdbc.meta">ClassMapping</a> type, |
| <a href="../../../../../../org/apache/openjpa/jdbc/kernel/JDBCStore.html" title="interface in org.apache.openjpa.jdbc.kernel">JDBCStore</a> store)</pre> |
| <div class="block"><strong>Description copied from interface: <code><a href="../../../../../../org/apache/openjpa/jdbc/kernel/exps/JDBCFilterListener.html#appendTo(org.apache.openjpa.jdbc.sql.SQLBuffer,%20org.apache.openjpa.jdbc.kernel.exps.FilterValue,%20org.apache.openjpa.jdbc.kernel.exps.FilterValue[],%20org.apache.openjpa.jdbc.meta.ClassMapping,%20org.apache.openjpa.jdbc.kernel.JDBCStore)">JDBCFilterListener</a></code></strong></div> |
| <div class="block">Append the SQL for this expression or value.</div> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code><a href="../../../../../../org/apache/openjpa/jdbc/kernel/exps/JDBCFilterListener.html#appendTo(org.apache.openjpa.jdbc.sql.SQLBuffer,%20org.apache.openjpa.jdbc.kernel.exps.FilterValue,%20org.apache.openjpa.jdbc.kernel.exps.FilterValue[],%20org.apache.openjpa.jdbc.meta.ClassMapping,%20org.apache.openjpa.jdbc.kernel.JDBCStore)">appendTo</a></code> in interface <code><a href="../../../../../../org/apache/openjpa/jdbc/kernel/exps/JDBCFilterListener.html" title="interface in org.apache.openjpa.jdbc.kernel.exps">JDBCFilterListener</a></code></dd> |
| <dt><span class="strong">Parameters:</span></dt><dd><code>buf</code> - the SQL buffer to append to</dd><dd><code>target</code> - the target to act on, or null if the listener |
| doesn't expect a target</dd><dd><code>args</code> - the values of the arguments given in the filter, or |
| null if this listener doesn't expect arguments</dd><dd><code>type</code> - the class mapping for the query's candidate class</dd><dd><code>store</code> - the store that owns the query</dd></dl> |
| </li> |
| </ul> |
| <a name="getType(java.lang.Class, java.lang.Class[])"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>getType</h4> |
| <pre>public <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> targetClass, |
| <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"><strong>Description copied from interface: <code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html#getType(java.lang.Class,%20java.lang.Class[])">FilterListener</a></code></strong></div> |
| <div class="block">Return the expected type of the result of this listener.</div> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html#getType(java.lang.Class,%20java.lang.Class[])">getType</a></code> in interface <code><a href="../../../../../../org/apache/openjpa/kernel/exps/FilterListener.html" title="interface in org.apache.openjpa.kernel.exps">FilterListener</a></code></dd> |
| <dt><span class="strong">Parameters:</span></dt><dd><code>targetClass</code> - the expected class of the target, or null if no target</dd><dd><code>argClasses</code> - the expected classes of the arguments, or null if |
| no arguments</dd></dl> |
| </li> |
| </ul> |
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