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package com.yahoo.searchdefinition.document;
import com.yahoo.document.ArrayDataType;
import com.yahoo.document.DataType;
import com.yahoo.document.Field;
import com.yahoo.document.MapDataType;
import com.yahoo.document.PositionDataType;
import com.yahoo.document.StructDataType;
/**
* Utils used to check whether a complex field supports being represented as struct field attributes.
*
* Currently we support:
* - array of simple struct
* - map of primitive type to simple struct
*
* @author geirst
*/
public class ComplexAttributeFieldUtils {
public static boolean isArrayOfSimpleStruct(ImmutableSDField field) {
DataType fieldType = field.getDataType();
if (fieldType instanceof ArrayDataType) {
ArrayDataType arrayType = (ArrayDataType)fieldType;
return isSimpleStruct(arrayType.getNestedType());
} else {
return false;
}
}
public static boolean isMapOfSimpleStruct(ImmutableSDField field) {
DataType fieldType = field.getDataType();
if (fieldType instanceof MapDataType) {
MapDataType mapType = (MapDataType)fieldType;
return isPrimitiveType(mapType.getKeyType()) &&
isSimpleStruct(mapType.getValueType());
} else {
return false;
}
}
private static boolean isSimpleStruct(DataType type) {
if (type instanceof StructDataType &&
!(type.equals(PositionDataType.INSTANCE))) {
StructDataType structType = (StructDataType) type;
for (Field innerField : structType.getFields()) {
if (!isPrimitiveType(innerField.getDataType())) {
return false;
}
}
return true;
} else {
return false;
}
}
private static boolean isPrimitiveType(DataType dataType) {
return dataType.equals(DataType.BYTE) ||
dataType.equals(DataType.INT) ||
dataType.equals(DataType.LONG) ||
dataType.equals(DataType.FLOAT) ||
dataType.equals(DataType.DOUBLE) ||
dataType.equals(DataType.STRING);
}
public static boolean isComplexFieldWithOnlyStructFieldAttributes(ImmutableSDField field) {
if (isArrayOfSimpleStruct(field)) {
return hasOnlyStructFieldAttributes(field);
} else if (isMapOfSimpleStruct(field)) {
return hasSingleAttribute(field.getStructField("key")) &&
hasOnlyStructFieldAttributes(field.getStructField("value"));
}
return false;
}
private static boolean hasOnlyStructFieldAttributes(ImmutableSDField field) {
for (ImmutableSDField structField : field.getStructFields()) {
if (!hasSingleAttribute(structField)) {
return false;
}
}
return true;
}
private static boolean hasSingleAttribute(ImmutableSDField field) {
if (field.getAttributes().size() != 1) {
return false;
}
return (field.getAttributes().get(field.getName()) != null);
}
}
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