本文整理了Java中org.geotools.data.Query.getMaxFeatures方法的一些代码示例，展示了Query.getMaxFeatures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.getMaxFeatures方法的具体详情如下：
包路径：org.geotools.data.Query
类名称：Query
方法名：getMaxFeatures

Query.getMaxFeatures介绍

[英]Get the maximum number of features that will be retrieved by this Query.

Note: This is the only method that is not directly out of the Query element in the WFS specification. It is instead a part of a GetFeature request, which can hold one or more queries. But each of those in turn will need a maxFeatures, so it is needed here.

If the value returned here is max integer then the number of features should not be limited.
[中]获取此查询将检索的最大功能数。
注意：这是WFS规范中唯一一个没有直接从查询元素中取出的方法。它是GetFeature请求的一部分，可以保存一个或多个查询。但每一个都需要一个maxFeatures，所以这里需要它。
如果此处返回的值为max integer，则不应限制功能的数量。

代码示例

代码示例来源：origin: geoserver/geoserver

query.getMaxFeatures() == Integer.MAX_VALUE ? null : query.getMaxFeatures();
offset = query.getStartIndex();
maxFeatures =
    query.getMaxFeatures() == Integer.MAX_VALUE ? null : query.getMaxFeatures();

代码示例来源：origin: geotools/geotools

private String getNextFromVisitor() {
  // if max features reached, no more items.
  if (counter >= idQuery.getMaxFeatures()) return null;
  if (visitorIterator.hasNext()) {
    counter++;
    return (String) visitorIterator.next();
  } else {
    // if next current visitor start is into bounds
    int nextStart = currentVisitorStart + STEP_LOAD;
    if (nextStart <= (start + max - 1)) {
      // init new visitor, next bounds
      currentVisitorStart = nextStart;
      initVisitor();
      // if don't have next value yet, no more data -> return null
      if (!visitorIterator.hasNext()) return null;
      // has next value, return it
      counter++;
      return (String) visitorIterator.next();
    }
  }
  return null;
}

代码示例来源：origin: geotools/geotools

public JTSIndexVisitorAdapter(final GranuleCatalogVisitor adaptee, Query q) {
  this.adaptee = adaptee;
  this.filter = q == null ? Query.ALL.getFilter() : q.getFilter();
  this.maxGranules = q.getMaxFeatures();
}

代码示例来源：origin: geotools/geotools

/**
 * Applies the limit/offset elements to the query if they are specified and if the dialect
 * supports them
 *
 * @param sql The sql to be modified
 * @param the query that holds the limit and offset parameters
 */
public void applyLimitOffset(StringBuffer sql, Query query) {
  applyLimitOffset(sql, query.getStartIndex(), query.getMaxFeatures());
}

代码示例来源：origin: geotools/geotools

public IndexUniqueVisitorIterator(
    FeatureCollection<SimpleFeatureType, SimpleFeature> fc,
    Query idQuery,
    String idFieldName) {
  super();
  this.fc = fc;
  this.idQuery = idQuery;
  this.idFieldName = idFieldName;
  this.start = idQuery.getStartIndex() != null ? idQuery.getStartIndex() : 0;
  this.max = idQuery.getMaxFeatures();
  currentVisitorStart = this.start;
  initVisitor();
}

代码示例来源：origin: geotools/geotools

/**
 * Hashcode based on all parameters other than the handle.
 *
 * @return hascode for this Query
 */
@Override
public int hashCode() {
  String[] n = getPropertyNames();
  return ((n == null) ? (-1) : ((n.length == 0) ? 0 : (n.length | n[0].hashCode())))
      | getMaxFeatures()
      | ((getFilter() == null) ? 0 : getFilter().hashCode())
      | ((getTypeName() == null) ? 0 : getTypeName().hashCode())
      | ((getVersion() == null) ? 0 : getVersion().hashCode())
      | ((getCoordinateSystem() == null) ? 0 : getCoordinateSystem().hashCode())
      | ((getCoordinateSystemReproject() == null)
          ? 0
          : getCoordinateSystemReproject().hashCode())
      | getStartIndex();
}

代码示例来源：origin: geotools/geotools

/** Test of getMaxFeatures method, of class org.geotools.data.Query. */
public void testMaxFeatures() {
  // System.out.println("testMaxFeatures");
  Query query = new Query();
  assertEquals(Query.DEFAULT_MAX, query.getMaxFeatures());
  query.setMaxFeatures(5);
  assertEquals(5, query.getMaxFeatures());
}

代码示例来源：origin: geotools/geotools

protected PreparedStatement selectJoinSQLPS(
    SimpleFeatureType featureType, JoinInfo join, Query query, Connection cx)
    throws SQLException, IOException {
  StringBuffer sql = new StringBuffer();
  sql.append("SELECT ");
  selectColumns(featureType, join.getPrimaryAlias(), query, sql);
  // joined columns
  for (JoinPart part : join.getParts()) {
    selectColumns(part.getQueryFeatureType(), part.getAlias(), query, sql);
  }
  sql.setLength(sql.length() - 1);
  dialect.encodePostSelect(featureType, sql);
  sql.append(" FROM ");
  // join clauses
  encodeTableJoin(featureType, join, query, sql);
  // filtering
  List<FilterToSQL> toSQLs = encodeWhereJoin(featureType, join, sql);
  // sorting
  sort(featureType, query.getSortBy(), join.getPrimaryAlias(), sql);
  // finally encode limit/offset, if necessary
  applyLimitOffset(sql, query.getStartIndex(), query.getMaxFeatures());
  LOGGER.fine(sql.toString());
  PreparedStatement ps =
      cx.prepareStatement(
          sql.toString(), ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
  ps.setFetchSize(fetchSize);
  setPreparedFilterValues(ps, toSQLs, cx);
  return ps;
}

代码示例来源：origin: geotools/geotools

applyLimitOffset(sql, query.getStartIndex(), query.getMaxFeatures());

代码示例来源：origin: geotools/geotools

protected String selectJoinSQL(SimpleFeatureType featureType, JoinInfo join, Query query)
    throws IOException, SQLException {
  StringBuffer sql = new StringBuffer();
  sql.append("SELECT ");
  // column names
  selectColumns(featureType, join.getPrimaryAlias(), query, sql);
  // joined columns
  for (JoinPart part : join.getParts()) {
    selectColumns(part.getQueryFeatureType(), part.getAlias(), query, sql);
  }
  sql.setLength(sql.length() - 1);
  dialect.encodePostSelect(featureType, sql);
  // from
  sql.append(" FROM ");
  // join clauses
  encodeTableJoin(featureType, join, query, sql);
  // filtering
  encodeWhereJoin(featureType, join, sql);
  // TODO: sorting
  sort(featureType, query.getSortBy(), join.getPrimaryAlias(), sql);
  // finally encode limit/offset, if necessary
  applyLimitOffset(sql, query.getStartIndex(), query.getMaxFeatures());
  return sql.toString();
}

代码示例来源：origin: geotools/geotools

if (txQuery.getMaxFeatures() > query.getMaxFeatures()) {
  transformed = new MaxFeaturesIterator(transformed, query.getMaxFeatures());

代码示例来源：origin: geotools/geotools

/**
 * Retrieve a FeatureReader<SimpleFeatureType, SimpleFeature> for the geometry attributes only,
 * designed for bounds computation
 */
protected FeatureReader<SimpleFeatureType, SimpleFeature> boundsReader() throws IOException {
  List attributes = new ArrayList();
  SimpleFeatureType schema = featureSource.getSchema();
  for (int i = 0; i < schema.getAttributeCount(); i++) {
    AttributeDescriptor at = schema.getDescriptor(i);
    if (at instanceof GeometryDescriptorImpl) attributes.add(at.getLocalName());
  }
  DefaultQuery q = new DefaultQuery(query);
  q.setPropertyNames(attributes);
  FeatureReader<SimpleFeatureType, SimpleFeature> reader =
      ((DataStore) featureSource.getDataStore()).getFeatureReader(q, getTransaction());
  int maxFeatures = query.getMaxFeatures();
  if (maxFeatures == Integer.MAX_VALUE) {
    return reader;
  } else {
    return new MaxFeatureReader<SimpleFeatureType, SimpleFeature>(reader, maxFeatures);
  }
}

代码示例来源：origin: geotools/geotools

/**
 * Retrieve a FeatureReader<SimpleFeatureType, SimpleFeature> for this Query
 *
 * @return FeatureReader<SimpleFeatureType, SimpleFeature> for this Query
 * @throws IOException If results could not be obtained
 */
public FeatureReader<SimpleFeatureType, SimpleFeature> reader() throws IOException {
  FeatureReader<SimpleFeatureType, SimpleFeature> reader;
  reader =
      ((DataStore) featureSource.getDataStore())
          .getFeatureReader(query, getTransaction());
  int maxFeatures = query.getMaxFeatures();
  if (maxFeatures != Integer.MAX_VALUE) {
    reader = new MaxFeatureReader<SimpleFeatureType, SimpleFeature>(reader, maxFeatures);
  }
  if (transform != null) {
    reader = new ReprojectFeatureReader(reader, getSchema(), transform);
  }
  return reader;
}

代码示例来源：origin: geotools/geotools

size -= query.getStartIndex();
return Math.min(size, query.getMaxFeatures());

代码示例来源：origin: geotools/geotools

int maxFeatures = query.getMaxFeatures();
return (count < maxFeatures) ? count : maxFeatures;

代码示例来源：origin: geotools/geotools

/**
 * Copy contructor.
 *
 * @param query the query to copy
 */
public Query(Query query) {
  this(
      query.getTypeName(),
      query.getNamespace(),
      query.getFilter(),
      query.getMaxFeatures(),
      query.getProperties(),
      query.getHandle());
  this.sortBy = query.getSortBy();
  this.coordinateSystem = query.getCoordinateSystem();
  this.coordinateSystemReproject = query.getCoordinateSystemReproject();
  this.version = query.getVersion();
  this.hints = query.getHints();
  this.startIndex = query.getStartIndex();
  this.alias = query.getAlias();
  this.joins = new ArrayList();
  for (Join j : query.getJoins()) {
    this.joins.add(new Join(j));
  }
}

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

if (sourceFeaturesCounter >= (start + query.getMaxFeatures())) {
  return false;

代码示例来源：origin: geotools/geotools

/**
   * Copy contructor, clones the state of a generic Query into a DefaultQuery
   *
   * @param query
   */
  public DefaultQuery(Query query) {
    this(
        query.getTypeName(),
        query.getNamespace(),
        query.getFilter(),
        query.getMaxFeatures(),
        query.getProperties(),
        query.getHandle());
    this.sortBy = query.getSortBy();
    this.coordinateSystem = query.getCoordinateSystem();
    this.coordinateSystemReproject = query.getCoordinateSystemReproject();
    this.version = query.getVersion();
    this.hints = query.getHints();
    this.startIndex = query.getStartIndex();
    this.alias = query.getAlias();
    this.joins = query.getJoins();
  }
}

代码示例来源：origin: geotools/geotools

protected GetFeatureRequest createGetFeature(Query query, ResultType resultType)
    throws IOException {
  GetFeatureRequest request = client.createGetFeatureRequest();
  final WFSDataStore dataStore = getDataStore();
  final QName remoteTypeName = dataStore.getRemoteTypeName(getEntry().getName());
  final SimpleFeatureType remoteSimpleFeatureType;
  remoteSimpleFeatureType = dataStore.getRemoteSimpleFeatureType(remoteTypeName);
  request.setTypeName(remoteTypeName);
  request.setFullType(remoteSimpleFeatureType);
  invertAxisInFilterIfNeeded(query, remoteSimpleFeatureType);
  request.setFilter(query.getFilter());
  request.setResultType(resultType);
  request.setHints(query.getHints());
  int maxFeatures = query.getMaxFeatures();
  if (Integer.MAX_VALUE > maxFeatures) {
    request.setMaxFeatures(maxFeatures);
  }
  // let the request decide request.setOutputFormat(outputFormat);
  request.setPropertyNames(query.getPropertyNames());
  request.setSortBy(query.getSortBy());
  String srsName = getSupportedSrsName(request, query);
  request.setSrsName(srsName);
  return request;
}