org.geotools.data.Query.setHints()方法的使用及代码示例

x33g5p2x  于2022-01-28 转载在 其他  
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本文整理了Java中org.geotools.data.Query.setHints方法的一些代码示例，展示了Query.setHints的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Query.setHints方法的具体详情如下：
包路径：org.geotools.data.Query
类名称：Query
方法名：setHints

Query.setHints介绍

[英]Set hints to control the query execution.

Hints can control such things as:

  • the GeometryFactory to be used
  • a generalization distance to be applied
  • the fetch size to be used in JDBC queries
    The set of hints supported can be found by calling org.geotools.data.FeatureSource#getSupportedHints().

Note: Data sources may ignore hints (depending on their values) and no mechanism currently exists to discover which hints where actually used during the query's execution.
[中]设置提示以控制查询执行。
提示可以控制以下情况：
*要使用的几何测量工厂
*要应用的泛化距离
*JDBC查询中要使用的获取大小
可以通过调用org找到支持的提示集。地理工具。数据FeatureSource#GetSupportedHits（）。
注意：数据源可能会忽略提示（取决于它们的值），并且目前不存在发现查询执行期间实际使用了哪些提示的机制。

代码示例

代码示例来源：origin: geoserver/geoserver

  1. result.setHints(securityQuery.getHints());
  2. } else if (securityQuery.getHints() == null) {
  3.   result.setHints(userQuery.getHints());
  4. } else {
  5.   Hints mix = userQuery.getHints();
  6.   mix.putAll(securityQuery.getHints());
  7.   result.setHints(mix);

代码示例来源：origin: geoserver/geoserver

  1. query.setMaxFeatures(maxEntries);
  2. query.setPropertyNames(new String[] {descriptor.getStartAttribute()});
  3. query.setHints(new Hints(StructuredCoverageViewReader.QUERY_FIRST_BAND, true));

代码示例来源：origin: geotools/geotools

  1. private Query setupBaseQuery(Query q) {
  2.   if (q == null) {
  3.     q = new Query();
  4.   } else {
  5.     q = new Query(q);
  6.   }
  7.   if (hints != null) {
  8.     q.setHints(hints);
  9.   }
  10.   if (q.getTypeName() == null) {
  11.     q.setTypeName(typeName);
  12.   }
  13.   return q;
  14. }

代码示例来源：origin: geotools/geotools

  1. /**
  2.  * Merges the wrapper hints with the query ones, making sure not to overwrite the query ones
  3.  *
  4.  * @param q
  5.  * @return
  6.  */
  7. protected Query mergeHints(Query q) {
  8.   if (this.hints == null || this.hints.isEmpty()) {
  9.     return q;
  10.   }
  11.   Query clone = new Query(q);
  12.   Hints hints = clone.getHints();
  13.   if (hints == null || hints.isEmpty()) {
  14.     clone.setHints(this.hints);
  15.   } else {
  16.     for (Entry<Object, Object> entry : this.hints.entrySet()) {
  17.       if (!hints.containsKey(entry.getKey())) {
  18.         hints.put(entry.getKey(), entry.getValue());
  19.       }
  20.     }
  21.   }
  22.   return clone;
  23. }

代码示例来源：origin: geotools/geotools

  1. private Query namedQuery(Filter filter, int countLimit, boolean isJoining, Hints hints) {
  2.   Query query = isJoining ? new JoiningQuery() : new Query();
  3.   if (getName().getNamespaceURI() != null) {
  4.     try {
  5.       query.setNamespace(new URI(getName().getNamespaceURI()));
  6.     } catch (URISyntaxException e) {
  7.       throw new RuntimeException(e);
  8.     }
  9.   }
  10.   query.setTypeName(getName().getLocalPart());
  11.   query.setFilter(filter);
  12.   query.setMaxFeatures(countLimit);
  13.   query.setHints(hints);
  14.   return query;
  15. }

代码示例来源：origin: geotools/geotools

  1. public void testWhereParam() throws Exception {
  2.   FeatureSource fsView = dataStore.getFeatureSource("riverParam");
  3.   // by default we get everything
  4.   assertEquals(2, fsView.getCount(Query.ALL));
  5.   // let's try filtering a bit dynamically
  6.   Query q = new Query(Query.ALL);
  7.   StringBuffer sb = new StringBuffer();
  8.   sb.append(" where ");
  9.   dialect.encodeColumnName(aname("flow"), sb);
  10.   sb.append(" > 4");
  11.   q.setHints(
  12.       new Hints(
  13.           Hints.VIRTUAL_TABLE_PARAMETERS,
  14.           Collections.singletonMap("where", sb.toString())));
  15.   assertEquals(1, fsView.getCount(q));
  16. }

代码示例来源：origin: geotools/geotools

  1. public void testMulParamInvalid() throws Exception {
  2.   FeatureSource fsView = dataStore.getFeatureSource("riverParam");
  3.   // let's set an invalid mul param
  4.   Query q = new Query(Query.ALL);
  5.   q.setHints(
  6.       new Hints(Hints.VIRTUAL_TABLE_PARAMETERS, Collections.singletonMap("mul", "abc")));
  7.   try {
  8.     fsView.getFeatures(q).features();
  9.     fail("Should have thrown an exception!");
  10.   } catch (Exception e) {
  11.     // fine
  12.   }
  13. }

代码示例来源：origin: geotools/geotools

  1. public void testMixQueryAll() {
  2.   // mixing Query.ALL equivalents with extra hints did not work
  3.   Query firstQuery = new Query(Query.ALL);
  4.   Query secondQuery = new Query(Query.ALL);
  5.   firstQuery.setHints(new Hints(Hints.USE_PROVIDED_FID, Boolean.TRUE));
  6.   secondQuery.setHints(new Hints(Hints.FEATURE_2D, Boolean.TRUE));
  7.   Query mixed = DataUtilities.mixQueries(firstQuery, secondQuery, "mixer");
  8.   assertEquals(2, mixed.getHints().size());
  9.   assertTrue((Boolean) mixed.getHints().get(Hints.USE_PROVIDED_FID));
  10.   assertTrue((Boolean) mixed.getHints().get(Hints.FEATURE_2D));
  11. }

代码示例来源：origin: geotools/geotools

  1. mixed.setHints(hints);
  2. if (start != 0) {
  3.   mixed.setStartIndex(start);

代码示例来源：origin: geotools/geotools

  1. public void testMulParamValid() throws Exception {
  2.   FilterFactory ff = CommonFactoryFinder.getFilterFactory(null);
  3.   FeatureSource fsView = dataStore.getFeatureSource("riverParam");
  4.   // let's change the mul param
  5.   Query q = new Query(Query.ALL);
  6.   q.setHints(
  7.       new Hints(Hints.VIRTUAL_TABLE_PARAMETERS, Collections.singletonMap("mul", "10")));
  8.   q.setSortBy(new SortBy[] {ff.sort(aname("mulflow"), SortOrder.ASCENDING)});
  9.   try (FeatureIterator fi = fsView.getFeatures(q).features()) {
  10.     assertTrue(fi.hasNext());
  11.     SimpleFeature f = (SimpleFeature) fi.next();
  12.     assertEquals(30.0, ((Number) f.getAttribute(aname("mulflow"))).doubleValue(), 0.1);
  13.     assertTrue(fi.hasNext());
  14.     f = (SimpleFeature) fi.next();
  15.     assertEquals(45.0, ((Number) f.getAttribute(aname("mulflow"))).doubleValue(), 0.1);
  16.   }
  17. }

代码示例来源：origin: geotools/geotools

  1. public void testGeometryFactoryHintsGF() throws IOException {
  2.   SimpleFeatureSource fs = dataStore.getFeatureSource(tname("road"));
  3.   assertTrue(fs.getSupportedHints().contains(Hints.JTS_GEOMETRY_FACTORY));
  4.   Query q = new Query(tname("road"));
  5.   GeometryFactory gf = new GeometryFactory(new LiteCoordinateSequenceFactory());
  6.   Hints hints = new Hints(Hints.JTS_GEOMETRY_FACTORY, gf);
  7.   q.setHints(hints);
  8.   try (SimpleFeatureIterator it = fs.getFeatures(q).features()) {
  9.     it.hasNext();
  10.     SimpleFeature f = (SimpleFeature) it.next();
  11.     LineString ls = (LineString) f.getDefaultGeometry();
  12.     assertTrue(ls.getCoordinateSequence() instanceof LiteCoordinateSequence);
  13.   }
  14. }

代码示例来源：origin: geotools/geotools

  1. public void testGeometryFactoryHint() throws Exception {
  2.   FilterFactory ff = dataStore.getFilterFactory();
  3.   PropertyIsEqualTo filter =
  4.       ff.equals(ff.property(aname("stringProperty")), ff.literal("one"));
  5.   Query query = new Query();
  6.   query.setFilter(filter);
  7.   // check we're respecting the geometry factory hint
  8.   GeometryFactory gf1 = new GeometryFactory();
  9.   query.setHints(new Hints(Hints.JTS_GEOMETRY_FACTORY, gf1));
  10.   SimpleFeature f1 = DataUtilities.first(featureSource.getFeatures(query));
  11.   assertSame(gf1, ((Geometry) f1.getDefaultGeometry()).getFactory());
  12.   // check we're respecting the geometry factory when changing it
  13.   GeometryFactory gf2 = new GeometryFactory();
  14.   query.setHints(new Hints(Hints.JTS_GEOMETRY_FACTORY, gf2));
  15.   SimpleFeature f2 = DataUtilities.first(featureSource.getFeatures(query));
  16.   assertSame(gf2, ((Geometry) f2.getDefaultGeometry()).getFactory());
  17. }

代码示例来源：origin: geotools/geotools

  1. public void testGeometryFactoryHintsCS() throws IOException {
  2.   SimpleFeatureSource fs = dataStore.getFeatureSource(tname("road"));
  3.   assertTrue(fs.getSupportedHints().contains(Hints.JTS_COORDINATE_SEQUENCE_FACTORY));
  4.   Query q = new Query(tname("road"));
  5.   Hints hints =
  6.       new Hints(
  7.           Hints.JTS_COORDINATE_SEQUENCE_FACTORY, new LiteCoordinateSequenceFactory());
  8.   q.setHints(hints);
  9.   try (SimpleFeatureIterator it = fs.getFeatures(q).features()) {
  10.     it.hasNext();
  11.     SimpleFeature f = (SimpleFeature) it.next();
  12.     LineString ls = (LineString) f.getDefaultGeometry();
  13.     assertTrue(ls.getCoordinateSequence() instanceof LiteCoordinateSequence);
  14.   }
  15. }

代码示例来源：origin: geotools/geotools

  1. private Query namedQuery(Query query) {
  2.   Query namedQuery =
  3.       namedQuery(
  4.           query.getFilter(), query.getMaxFeatures(), query instanceof JoiningQuery);
  5.   namedQuery.setProperties(query.getProperties());
  6.   namedQuery.setCoordinateSystem(query.getCoordinateSystem());
  7.   namedQuery.setCoordinateSystemReproject(query.getCoordinateSystemReproject());
  8.   namedQuery.setHandle(query.getHandle());
  9.   namedQuery.setMaxFeatures(query.getMaxFeatures());
  10.   namedQuery.setStartIndex(query.getStartIndex());
  11.   namedQuery.setSortBy(query.getSortBy());
  12.   namedQuery.setHints(query.getHints());
  13.   if (query instanceof JoiningQuery) {
  14.     ((JoiningQuery) namedQuery).setQueryJoins(((JoiningQuery) query).getQueryJoins());
  15.     ((JoiningQuery) namedQuery).setRootMapping(((JoiningQuery) query).getRootMapping());
  16.   }
  17.   return namedQuery;
  18. }

代码示例来源：origin: geotools/geotools

  1. /**
  2.  * Makes sure the datastore works when the renderer uses the typical rendering hints
  3.  *
  4.  * @throws Exception
  5.  */
  6. public void testRendererBehaviour() throws Exception {
  7.   Query query = new Query(featureSource.getSchema().getTypeName());
  8.   query.setHints(
  9.       new Hints(
  10.           new Hints(
  11.               Hints.JTS_COORDINATE_SEQUENCE_FACTORY,
  12.               new LiteCoordinateSequenceFactory())));
  13.   SimpleFeatureCollection fc = featureSource.getFeatures(query);
  14.   try (SimpleFeatureIterator fi = fc.features()) {
  15.     while (fi.hasNext()) {
  16.       fi.next();
  17.     }
  18.   }
  19. }

代码示例来源：origin: geotools/geotools

  1. public void testSimplification() throws Exception {
  2.   SimpleFeatureSource fs = dataStore.getFeatureSource(tname("road"));
  3.   if (fs.getSupportedHints().contains(Hints.GEOMETRY_SIMPLIFICATION) == false) return;
  4.   SimpleFeatureCollection fColl = fs.getFeatures();
  5.   Geometry original = null;
  6.   try (SimpleFeatureIterator iterator = fColl.features()) {
  7.     if (iterator.hasNext()) {
  8.       original = (Geometry) iterator.next().getDefaultGeometry();
  9.     }
  10.   }
  11.   double width = original.getEnvelope().getEnvelopeInternal().getWidth();
  12.   Query query = new Query();
  13.   Hints hints = new Hints(Hints.GEOMETRY_SIMPLIFICATION, width / 2);
  14.   query.setHints(hints);
  15.   Geometry simplified = null;
  16.   fColl = fs.getFeatures(query);
  17.   try (SimpleFeatureIterator iterator = fColl.features()) {
  18.     if (iterator.hasNext()) simplified = (Geometry) iterator.next().getDefaultGeometry();
  19.   }
  20.   assertTrue(original.getNumPoints() >= simplified.getNumPoints());
  21. }

代码示例来源：origin: geotools/geotools

  1. public void testGeneralization() throws Exception {
  2.   SimpleFeatureSource fs = dataStore.getFeatureSource(tname("lake"));
  3.   if (fs.getSupportedHints().contains(Hints.GEOMETRY_GENERALIZATION) == false) return;
  4.   SimpleFeatureCollection fColl = fs.getFeatures();
  5.   Geometry original = null;
  6.   try (SimpleFeatureIterator iterator = fColl.features()) {
  7.     if (iterator.hasNext()) {
  8.       original = (Geometry) iterator.next().getDefaultGeometry();
  9.     }
  10.   }
  11.   double width = original.getEnvelope().getEnvelopeInternal().getWidth();
  12.   Query query = new Query();
  13.   Hints hints = new Hints(Hints.GEOMETRY_GENERALIZATION, width / 2);
  14.   query.setHints(hints);
  15.   Geometry generalized = null;
  16.   fColl = fs.getFeatures(query);
  17.   try (SimpleFeatureIterator iterator = fColl.features()) {
  18.     if (iterator.hasNext()) {
  19.       generalized = (Geometry) iterator.next().getDefaultGeometry();
  20.     }
  21.   }
  22.   assertTrue(original.getNumPoints() >= generalized.getNumPoints());
  23. }

代码示例来源：origin: geotools/geotools

  1. Filter bbox = new FastBBOX(filterFactory.property(""), bounds, filterFactory);
  2. optimizedQuery = new Query(null, bbox);
  3. optimizedQuery.setHints(layerQuery.getHints());

代码示例来源：origin: geotools/geotools

  1. hints.put(Hints.JTS_COORDINATE_SEQUENCE_FACTORY, new LiteCoordinateSequenceFactory());
  2. Query query = new Query(tname(getPoly3d()));
  3. query.setHints(hints);

代码示例来源：origin: geotools/geotools

  1. new Hints(
  2.         Hints.JTS_COORDINATE_SEQUENCE_FACTORY, new LiteCoordinateSequenceFactory());
  3. q.setHints(hints);

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