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| <h2 title="Interface QueryRouter" class="title">Interface QueryRouter</h2> |
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| <pre>public interface <span class="typeNameLabel">QueryRouter</span></pre> |
| <div class="block">An interface used by Queries to route themselves to an appropriate QueryEngine. As of |
| 1.2 QueryRouter only supports routing by DataMap.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.2</dd> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code><a href="../access/QueryEngine.html" title="interface in org.apache.cayenne.access">QueryEngine</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#engineForDataMap(org.apache.cayenne.map.DataMap)">engineForDataMap</a></span>​(<a href="../map/DataMap.html" title="class in org.apache.cayenne.map">DataMap</a> map)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns a QueryEngine that is configured to handle a given DataMap.</div> |
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| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../access/QueryEngine.html" title="interface in org.apache.cayenne.access">QueryEngine</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#engineForName(java.lang.String)">engineForName</a></span>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> name)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns a QueryEngine for a given name.</div> |
| </td> |
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| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#route(org.apache.cayenne.access.QueryEngine,org.apache.cayenne.query.Query,org.apache.cayenne.query.Query)">route</a></span>​(<a href="../access/QueryEngine.html" title="interface in org.apache.cayenne.access">QueryEngine</a> engine, |
| <a href="Query.html" title="interface in org.apache.cayenne.query">Query</a> query, |
| <a href="Query.html" title="interface in org.apache.cayenne.query">Query</a> substitutedQuery)</code></th> |
| <td class="colLast"> |
| <div class="block">A callback method that allows a query to set its preferred engine during the |
| routing phase.</div> |
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| <h3>Method Detail</h3> |
| <a id="route(org.apache.cayenne.access.QueryEngine,org.apache.cayenne.query.Query,org.apache.cayenne.query.Query)"> |
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| <h4>route</h4> |
| <pre class="methodSignature">void route​(<a href="../access/QueryEngine.html" title="interface in org.apache.cayenne.access">QueryEngine</a> engine, |
| <a href="Query.html" title="interface in org.apache.cayenne.query">Query</a> query, |
| <a href="Query.html" title="interface in org.apache.cayenne.query">Query</a> substitutedQuery)</pre> |
| <div class="block">A callback method that allows a query to set its preferred engine during the |
| routing phase. It allows query to further customize its routing, e.g. it is |
| possible to implement query chains that pass multiple queries for execution.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>engine</code> - engine to use for query execution</dd> |
| <dd><code>query</code> - A query to execute.</dd> |
| <dd><code>substitutedQuery</code> - a query that was substituted for "query". Results must be |
| mapped back to substituted query.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>engineForName</h4> |
| <pre class="methodSignature"><a href="../access/QueryEngine.html" title="interface in org.apache.cayenne.access">QueryEngine</a> engineForName​(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> name)</pre> |
| <div class="block">Returns a QueryEngine for a given name. If the name is null, a default |
| QueryEngine is returned. If there's no default engine, an exception is |
| thrown.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>4.0</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="engineForDataMap(org.apache.cayenne.map.DataMap)"> |
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| <h4>engineForDataMap</h4> |
| <pre class="methodSignature"><a href="../access/QueryEngine.html" title="interface in org.apache.cayenne.access">QueryEngine</a> engineForDataMap​(<a href="../map/DataMap.html" title="class in org.apache.cayenne.map">DataMap</a> map)</pre> |
| <div class="block">Returns a QueryEngine that is configured to handle a given DataMap.</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../CayenneRuntimeException.html" title="class in org.apache.cayenne">CayenneRuntimeException</a></code> - if an engine can't be found.</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang" class="externalLink">NullPointerException</a></code> - if a map parameter is null.</dd> |
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