import org.apache.lucene.queries.function.valuesource.DoubleFieldSource; //导入依赖的package包/类
@Override
public ValueSource getValueSource(String name) {
  Object o = map.get(name);
  if (o == null) {
    throw new IllegalArgumentException("Invalid reference '" + name + "'");
  } else if (o instanceof Expression) {
    return ((Expression)o).getValueSource(this);
  } else if (o instanceof ValueSource) {
    return ((ValueSource)o);
  }
  SortField field = (SortField) o;
  switch(field.getType()) {
    case INT:
      return new IntFieldSource(field.getField(), (IntParser) field.getParser());
    case LONG:
      return new LongFieldSource(field.getField(), (LongParser) field.getParser());
    case FLOAT:
      return new FloatFieldSource(field.getField(), (FloatParser) field.getParser());
    case DOUBLE:
      return new DoubleFieldSource(field.getField(), (DoubleParser) field.getParser());
    case SCORE:
      return getScoreValueSource();
    default:
      throw new UnsupportedOperationException(); 
  }
}
 

import org.apache.lucene.queries.function.valuesource.DoubleFieldSource; //导入依赖的package包/类
@Override
public ValueSource getValueSource(SchemaField field, QParser qparser) {
  field.checkFieldCacheSource(qparser);
  switch (type) {
    case INTEGER:
      return new IntFieldSource( field.getName(), FieldCache.NUMERIC_UTILS_INT_PARSER );
    case FLOAT:
      return new FloatFieldSource( field.getName(), FieldCache.NUMERIC_UTILS_FLOAT_PARSER );
    case DATE:
      return new TrieDateFieldSource( field.getName(), FieldCache.NUMERIC_UTILS_LONG_PARSER );        
    case LONG:
      return new LongFieldSource( field.getName(), FieldCache.NUMERIC_UTILS_LONG_PARSER );
    case DOUBLE:
      return new DoubleFieldSource( field.getName(), FieldCache.NUMERIC_UTILS_DOUBLE_PARSER );
    default:
      throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Unknown type for trie field: " + field.name);
  }
}
 

import org.apache.lucene.queries.function.valuesource.DoubleFieldSource; //导入依赖的package包/类
@Override
public ValueSource getValueSource(String name) {
  Object o = map.get(name);
  if (o == null) {
    throw new IllegalArgumentException("Invalid reference '" + name + "'");
  } else if (o instanceof Expression) {
    return ((Expression)o).getValueSource(this);
  }
  SortField field = (SortField) o;
  switch(field.getType()) {
    case INT:
      return new IntFieldSource(field.getField(), (IntParser) field.getParser());
    case LONG:
      return new LongFieldSource(field.getField(), (LongParser) field.getParser());
    case FLOAT:
      return new FloatFieldSource(field.getField(), (FloatParser) field.getParser());
    case DOUBLE:
      return new DoubleFieldSource(field.getField(), (DoubleParser) field.getParser());
    case SCORE:
      return getScoreValueSource();
    default:
      throw new UnsupportedOperationException(); 
  }
}
 

import org.apache.lucene.queries.function.valuesource.DoubleFieldSource; //导入依赖的package包/类
public void testDouble() throws Exception {
  assertHits(new FunctionQuery(new DoubleFieldSource("double")),
      new float[] { 3.63f, 5.65f });
}
 

import org.apache.lucene.queries.function.valuesource.DoubleFieldSource; //导入依赖的package包/类
/** Create {@code RangeFacetCounts}, using {@link
 *  DoubleFieldSource} from the specified field. */
public DoubleRangeFacetCounts(String field, FacetsCollector hits, DoubleRange... ranges) throws IOException {
  this(field, new DoubleFieldSource(field), hits, ranges);
}
 

import org.apache.lucene.queries.function.valuesource.DoubleFieldSource; //导入依赖的package包/类
@Override
public ValueSource getValueSource(SchemaField field, QParser qparser) {
  field.checkFieldCacheSource(qparser);
  return new DoubleFieldSource(field.name);
}