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| <div class="subTitle">org.apache.openjpa.persistence</div> |
| <h2 title="Class HintHandler" class="title">Class HintHandler</h2> |
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| <ul class="inheritance"> |
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| <ul class="inheritance"> |
| <li>org.apache.openjpa.persistence.HintHandler</li> |
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| <pre>public class <span class="typeNameLabel">HintHandler</span> |
| extends <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Manages query hint keys and handles their values on behalf of a owning |
| <a href="../../../../org/apache/openjpa/persistence/QueryImpl.html" title="class in org.apache.openjpa.persistence"><code>QueryImpl</code></a>. Uses specific knowledge of hint keys declared in |
| different parts of the system. |
| |
| This receiver collects hint keys from different parts of the system. The |
| keys are implicitly or explicitly declared by several different mechanics. |
| This receiver sets the values on behalf of a owning <a href="../../../../org/apache/openjpa/persistence/QueryImpl.html" title="class in org.apache.openjpa.persistence"><code>QueryImpl</code></a> |
| based on the its specific knowledge of these keys. |
| |
| The hint keys from following sources are collected and handled: |
| |
| 1. <a href="../../../../org/apache/openjpa/kernel/QueryHints.html" title="interface in org.apache.openjpa.kernel"><code>QueryHints</code></a> interface declares hint keys |
| as public static final fields. These fields are collected by reflection. |
| The values are handled by invoking methods on the owning <a href="../../../../org/apache/openjpa/persistence/QueryImpl.html" title="class in org.apache.openjpa.persistence"><code>QueryImpl</code></a> |
| |
| 2. Some hint keys are collected from bean-style property names of <code>JDBCFetchPlan</code> by <a href="../../../../org/apache/openjpa/enhance/Reflection.html#getBeanStylePropertyNames-java.lang.Class-"><code>reflection</code></a> and prefixed with <code>openjpa.FetchPlan</code>. |
| Their values are used to set the corresponding property of <a href="../../../../org/apache/openjpa/persistence/FetchPlan.html" title="interface in org.apache.openjpa.persistence"><code>FetchPlan</code></a> via <code>reflection</code> |
| |
| 3. Currently defined <code>javax.persistence.*</code> hint keys have |
| a equivalent counterpart to one of these FetchPlan keys. |
| The JPA keys are mapped to equivalent FetchPlan hint keys. |
| |
| 4. Some keys directly invoke setters or add listeners to the owning |
| <a href="../../../../org/apache/openjpa/persistence/QueryImpl.html" title="class in org.apache.openjpa.persistence"><code>QueryImpl</code></a>. These hint keys are statically declared in |
| this receiver itself. |
| |
| 5. ProductDerivation may introduce their own query hint keys via <a href="../../../../org/apache/openjpa/lib/conf/ProductDerivation.html#getSupportedQueryHints--"><code>ProductDerivation.getSupportedQueryHints()</code></a>. Their values are set in the |
| <a href="../../../../org/apache/openjpa/kernel/FetchConfiguration.html#setHint-java.lang.String-java.lang.Object-"><code>FetchConfiguration.setHint(String, Object)</code></a> |
| |
| A hint key is classified into one of the following three categories: |
| |
| 1. Supported: A key is known to this receiver as collected from different |
| parts of the system. The value of a supported key is recorded and |
| available via <a href="../../../../org/apache/openjpa/persistence/HintHandler.html#getHints--"><code>getHints()</code></a> method. |
| 2. Recognized: A key is not known to this receiver but has a prefix which |
| is known to this receiver. The value of a recognized key is not recorded |
| but its value is available via <a href="../../../../org/apache/openjpa/kernel/FetchConfiguration.html#getHint-java.lang.String-"><code>FetchConfiguration.getHint(String)</code></a> |
| 3. Unrecognized: A key is neither supported nor recognized. The value of a |
| unrecognized key is neither recorded nor set anywhere. |
| |
| If an incompatible value is supplied for a supported key, a non-fatal |
| <a href="../../../../org/apache/openjpa/persistence/ArgumentException.html" title="class in org.apache.openjpa.persistence"><code>ArgumentException</code></a> is raised.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.0.0</dd> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>Pinaki Poddar</dd> |
| </dl> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
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| <!-- =========== FIELD SUMMARY =========== --> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected static <a href="http://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</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>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openjpa/persistence/HintHandler.html#Z:Z_supportedHints">_supportedHints</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>protected <a href="../../../../org/apache/openjpa/persistence/QueryImpl.html" title="class in org.apache.openjpa.persistence">QueryImpl</a><?></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openjpa/persistence/HintHandler.html#owner">owner</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected static <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/HintHandler.html#PREFIX_FETCHPLAN">PREFIX_FETCHPLAN</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>protected static <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/HintHandler.html#PREFIX_JDBC">PREFIX_JDBC</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected static <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/HintHandler.html#PREFIX_OPENJPA">PREFIX_OPENJPA</a></span></code> </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
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| <li class="blockList"><a name="method.summary"> |
| <!-- --> |
| </a> |
| <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"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </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="http://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</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>,<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openjpa/persistence/HintHandler.html#getHints--">getHints</a></span>()</code> |
| <div class="block">Gets all the recorded hint keys and their values.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</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>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openjpa/persistence/HintHandler.html#getSupportedHints--">getSupportedHints</a></span>()</code> |
| <div class="block">Gets all the supported hint keys.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>protected boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openjpa/persistence/HintHandler.html#isKnownPrefix-java.lang.String-">isKnownPrefix</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> key)</code> |
| <div class="block">Affirms if the given key starts with any of the known prefix.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>protected <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openjpa/persistence/HintHandler.html#record-java.lang.String-java.lang.Object-">record</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> hint, |
| <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> value)</code> |
| <div class="block">Record a key-value pair only only if the given key is supported.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openjpa/persistence/HintHandler.html#setHint-java.lang.String-java.lang.Object-">setHint</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> key, |
| <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> value)</code> </td> |
| </tr> |
| </table> |
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| <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3> |
| <code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/8/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://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" 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 =========== --> |
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| <li class="blockList"><a name="field.detail"> |
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| <h3>Field Detail</h3> |
| <a name="owner"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>owner</h4> |
| <pre>protected final <a href="../../../../org/apache/openjpa/persistence/QueryImpl.html" title="class in org.apache.openjpa.persistence">QueryImpl</a><?> owner</pre> |
| </li> |
| </ul> |
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| <h4>_supportedHints</h4> |
| <pre>protected static <a href="http://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</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>> _supportedHints</pre> |
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| <h4>PREFIX_OPENJPA</h4> |
| <pre>protected static final <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> PREFIX_OPENJPA</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.openjpa.persistence.HintHandler.PREFIX_OPENJPA">Constant Field Values</a></dd> |
| </dl> |
| </li> |
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| <h4>PREFIX_JDBC</h4> |
| <pre>protected static final <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> PREFIX_JDBC</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.openjpa.persistence.HintHandler.PREFIX_JDBC">Constant Field Values</a></dd> |
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| <h4>PREFIX_FETCHPLAN</h4> |
| <pre>protected static final <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> PREFIX_FETCHPLAN</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.openjpa.persistence.HintHandler.PREFIX_FETCHPLAN">Constant Field Values</a></dd> |
| </dl> |
| </li> |
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| <!-- ============ METHOD DETAIL ========== --> |
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| <h3>Method Detail</h3> |
| <a name="record-java.lang.String-java.lang.Object-"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>record</h4> |
| <pre>protected <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</a> record(<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> hint, |
| <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> value)</pre> |
| <div class="block">Record a key-value pair only only if the given key is supported.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>FALSE if the key is unrecognized. |
| null (i.e. MAY BE) if the key is recognized, but not supported. |
| TRUE if the key is supported.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>setHint</h4> |
| <pre>public void setHint(<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> key, |
| <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> value)</pre> |
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| <h4>isKnownPrefix</h4> |
| <pre>protected boolean isKnownPrefix(<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> key)</pre> |
| <div class="block">Affirms if the given key starts with any of the known prefix.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - </dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getSupportedHints--"> |
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| <h4>getSupportedHints</h4> |
| <pre>public <a href="http://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</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>> getSupportedHints()</pre> |
| <div class="block">Gets all the supported hint keys. The set of supported hint keys is |
| statically determined by collecting hint keys from the ProductDerivations.</div> |
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| <h4>getHints</h4> |
| <pre>public <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><<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/Object.html?is-external=true" title="class or interface in java.lang">Object</a>> getHints()</pre> |
| <div class="block">Gets all the recorded hint keys and their values.</div> |
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