1 package org.simantics.db.indexing;
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3 import java.util.Collections;
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4 import java.util.List;
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6 import org.simantics.db.ReadGraph;
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7 import org.simantics.db.Resource;
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8 import org.simantics.db.common.primitiverequest.Adapter;
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9 import org.simantics.db.common.procedure.adapter.TransientCacheListener;
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10 import org.simantics.db.common.request.BinaryRead;
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11 import org.simantics.db.exception.DatabaseException;
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12 import org.simantics.operation.Layer0X;
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13 import org.simantics.scl.runtime.function.Function;
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16 * A (cacheable) query to optimize single index queries for immutable
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17 * indexes such as ontologies.
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19 class QueryIndexResources extends BinaryRead<Resource, String, List<Resource>> {
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21 public QueryIndexResources(Resource index, String filter) {
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22 super(index, filter);
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26 public List<Resource> perform(ReadGraph graph) throws DatabaseException {
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28 Layer0X L0X = Layer0X.getInstance(graph);
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30 @SuppressWarnings({ "unchecked", "rawtypes" })
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31 Function dependencies = graph.syncRequest(new Adapter(L0X.DependencyResources, Function.class), TransientCacheListener.<Function>instance());
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33 @SuppressWarnings("unchecked")
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34 List<Resource> results = (List<Resource>)dependencies.apply(graph, parameter, parameter2);
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35 if (results == null || results.isEmpty())
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36 return Collections.emptyList();
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