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

result.setHints(securityQuery.getHints());
} else if (securityQuery.getHints() == null) {
  result.setHints(userQuery.getHints());
} else {
  Hints mix = userQuery.getHints();
  mix.putAll(securityQuery.getHints());
  result.setHints(mix);

代码示例来源：origin: geoserver/geoserver

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

代码示例来源：origin: geotools/geotools

private Query setupBaseQuery(Query q) {
  if (q == null) {
    q = new Query();
  } else {
    q = new Query(q);
  }
  if (hints != null) {
    q.setHints(hints);
  }
  if (q.getTypeName() == null) {
    q.setTypeName(typeName);
  }
  return q;
}

代码示例来源：origin: geotools/geotools

/**
 * Merges the wrapper hints with the query ones, making sure not to overwrite the query ones
 *
 * @param q
 * @return
 */
protected Query mergeHints(Query q) {
  if (this.hints == null || this.hints.isEmpty()) {
    return q;
  }
  Query clone = new Query(q);
  Hints hints = clone.getHints();
  if (hints == null || hints.isEmpty()) {
    clone.setHints(this.hints);
  } else {
    for (Entry<Object, Object> entry : this.hints.entrySet()) {
      if (!hints.containsKey(entry.getKey())) {
        hints.put(entry.getKey(), entry.getValue());
      }
    }
  }
  return clone;
}

代码示例来源：origin: geotools/geotools

private Query namedQuery(Filter filter, int countLimit, boolean isJoining, Hints hints) {
  Query query = isJoining ? new JoiningQuery() : new Query();
  if (getName().getNamespaceURI() != null) {
    try {
      query.setNamespace(new URI(getName().getNamespaceURI()));
    } catch (URISyntaxException e) {
      throw new RuntimeException(e);
    }
  }
  query.setTypeName(getName().getLocalPart());
  query.setFilter(filter);
  query.setMaxFeatures(countLimit);
  query.setHints(hints);
  return query;
}

代码示例来源：origin: geotools/geotools

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

代码示例来源：origin: geotools/geotools

public void testMulParamInvalid() throws Exception {
  FeatureSource fsView = dataStore.getFeatureSource("riverParam");
  // let's set an invalid mul param
  Query q = new Query(Query.ALL);
  q.setHints(
      new Hints(Hints.VIRTUAL_TABLE_PARAMETERS, Collections.singletonMap("mul", "abc")));
  try {
    fsView.getFeatures(q).features();
    fail("Should have thrown an exception!");
  } catch (Exception e) {
    // fine
  }
}

代码示例来源：origin: geotools/geotools

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

代码示例来源：origin: geotools/geotools

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

代码示例来源：origin: geotools/geotools

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

代码示例来源：origin: geotools/geotools

public void testGeometryFactoryHintsGF() throws IOException {
  SimpleFeatureSource fs = dataStore.getFeatureSource(tname("road"));
  assertTrue(fs.getSupportedHints().contains(Hints.JTS_GEOMETRY_FACTORY));
  Query q = new Query(tname("road"));
  GeometryFactory gf = new GeometryFactory(new LiteCoordinateSequenceFactory());
  Hints hints = new Hints(Hints.JTS_GEOMETRY_FACTORY, gf);
  q.setHints(hints);
  try (SimpleFeatureIterator it = fs.getFeatures(q).features()) {
    it.hasNext();
    SimpleFeature f = (SimpleFeature) it.next();
    LineString ls = (LineString) f.getDefaultGeometry();
    assertTrue(ls.getCoordinateSequence() instanceof LiteCoordinateSequence);
  }
}

代码示例来源：origin: geotools/geotools

public void testGeometryFactoryHint() throws Exception {
  FilterFactory ff = dataStore.getFilterFactory();
  PropertyIsEqualTo filter =
      ff.equals(ff.property(aname("stringProperty")), ff.literal("one"));
  Query query = new Query();
  query.setFilter(filter);
  // check we're respecting the geometry factory hint
  GeometryFactory gf1 = new GeometryFactory();
  query.setHints(new Hints(Hints.JTS_GEOMETRY_FACTORY, gf1));
  SimpleFeature f1 = DataUtilities.first(featureSource.getFeatures(query));
  assertSame(gf1, ((Geometry) f1.getDefaultGeometry()).getFactory());
  // check we're respecting the geometry factory when changing it
  GeometryFactory gf2 = new GeometryFactory();
  query.setHints(new Hints(Hints.JTS_GEOMETRY_FACTORY, gf2));
  SimpleFeature f2 = DataUtilities.first(featureSource.getFeatures(query));
  assertSame(gf2, ((Geometry) f2.getDefaultGeometry()).getFactory());
}

代码示例来源：origin: geotools/geotools

public void testGeometryFactoryHintsCS() throws IOException {
  SimpleFeatureSource fs = dataStore.getFeatureSource(tname("road"));
  assertTrue(fs.getSupportedHints().contains(Hints.JTS_COORDINATE_SEQUENCE_FACTORY));
  Query q = new Query(tname("road"));
  Hints hints =
      new Hints(
          Hints.JTS_COORDINATE_SEQUENCE_FACTORY, new LiteCoordinateSequenceFactory());
  q.setHints(hints);
  try (SimpleFeatureIterator it = fs.getFeatures(q).features()) {
    it.hasNext();
    SimpleFeature f = (SimpleFeature) it.next();
    LineString ls = (LineString) f.getDefaultGeometry();
    assertTrue(ls.getCoordinateSequence() instanceof LiteCoordinateSequence);
  }
}

代码示例来源：origin: geotools/geotools

private Query namedQuery(Query query) {
  Query namedQuery =
      namedQuery(
          query.getFilter(), query.getMaxFeatures(), query instanceof JoiningQuery);
  namedQuery.setProperties(query.getProperties());
  namedQuery.setCoordinateSystem(query.getCoordinateSystem());
  namedQuery.setCoordinateSystemReproject(query.getCoordinateSystemReproject());
  namedQuery.setHandle(query.getHandle());
  namedQuery.setMaxFeatures(query.getMaxFeatures());
  namedQuery.setStartIndex(query.getStartIndex());
  namedQuery.setSortBy(query.getSortBy());
  namedQuery.setHints(query.getHints());
  if (query instanceof JoiningQuery) {
    ((JoiningQuery) namedQuery).setQueryJoins(((JoiningQuery) query).getQueryJoins());
    ((JoiningQuery) namedQuery).setRootMapping(((JoiningQuery) query).getRootMapping());
  }
  return namedQuery;
}

代码示例来源：origin: geotools/geotools

/**
 * Makes sure the datastore works when the renderer uses the typical rendering hints
 *
 * @throws Exception
 */
public void testRendererBehaviour() throws Exception {
  Query query = new Query(featureSource.getSchema().getTypeName());
  query.setHints(
      new Hints(
          new Hints(
              Hints.JTS_COORDINATE_SEQUENCE_FACTORY,
              new LiteCoordinateSequenceFactory())));
  SimpleFeatureCollection fc = featureSource.getFeatures(query);
  try (SimpleFeatureIterator fi = fc.features()) {
    while (fi.hasNext()) {
      fi.next();
    }
  }
}

代码示例来源：origin: geotools/geotools

public void testSimplification() throws Exception {
  SimpleFeatureSource fs = dataStore.getFeatureSource(tname("road"));
  if (fs.getSupportedHints().contains(Hints.GEOMETRY_SIMPLIFICATION) == false) return;
  SimpleFeatureCollection fColl = fs.getFeatures();
  Geometry original = null;
  try (SimpleFeatureIterator iterator = fColl.features()) {
    if (iterator.hasNext()) {
      original = (Geometry) iterator.next().getDefaultGeometry();
    }
  }
  double width = original.getEnvelope().getEnvelopeInternal().getWidth();
  Query query = new Query();
  Hints hints = new Hints(Hints.GEOMETRY_SIMPLIFICATION, width / 2);
  query.setHints(hints);
  Geometry simplified = null;
  fColl = fs.getFeatures(query);
  try (SimpleFeatureIterator iterator = fColl.features()) {
    if (iterator.hasNext()) simplified = (Geometry) iterator.next().getDefaultGeometry();
  }
  assertTrue(original.getNumPoints() >= simplified.getNumPoints());
}

代码示例来源：origin: geotools/geotools

public void testGeneralization() throws Exception {
  SimpleFeatureSource fs = dataStore.getFeatureSource(tname("lake"));
  if (fs.getSupportedHints().contains(Hints.GEOMETRY_GENERALIZATION) == false) return;
  SimpleFeatureCollection fColl = fs.getFeatures();
  Geometry original = null;
  try (SimpleFeatureIterator iterator = fColl.features()) {
    if (iterator.hasNext()) {
      original = (Geometry) iterator.next().getDefaultGeometry();
    }
  }
  double width = original.getEnvelope().getEnvelopeInternal().getWidth();
  Query query = new Query();
  Hints hints = new Hints(Hints.GEOMETRY_GENERALIZATION, width / 2);
  query.setHints(hints);
  Geometry generalized = null;
  fColl = fs.getFeatures(query);
  try (SimpleFeatureIterator iterator = fColl.features()) {
    if (iterator.hasNext()) {
      generalized = (Geometry) iterator.next().getDefaultGeometry();
    }
  }
  assertTrue(original.getNumPoints() >= generalized.getNumPoints());
}

代码示例来源：origin: geotools/geotools

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

代码示例来源：origin: geotools/geotools

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

代码示例来源：origin: geotools/geotools

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