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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchdefinition.derived;
import com.yahoo.document.ArrayDataType;
import com.yahoo.document.DataType;
import com.yahoo.document.Field;
import com.yahoo.document.StructuredDataType;
import com.yahoo.document.WeightedSetDataType;
import com.yahoo.searchdefinition.Search;
import com.yahoo.searchdefinition.document.BooleanIndexDefinition;
import com.yahoo.searchdefinition.document.FieldSet;
import com.yahoo.searchdefinition.document.ImmutableSDField;
import com.yahoo.vespa.config.search.IndexschemaConfig;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
/**
* Deriver of indexschema config containing information of all index fields with name and data type.
*
* @author geirst
*/
public class IndexSchema extends Derived implements IndexschemaConfig.Producer {
private final List<IndexField> fields = new ArrayList<>();
private final Map<String, FieldCollection> collections = new LinkedHashMap<>();
private final Map<String, FieldSet> fieldSets = new LinkedHashMap<>();
public IndexSchema(Search search) {
fieldSets.putAll(search.fieldSets().userFieldSets());
derive(search);
}
public boolean containsField(String fieldName) {
return fields.stream().anyMatch(field -> field.getName().equals(fieldName));
}
@Override
protected void derive(Search search) {
super.derive(search);
}
private void deriveIndexFields(ImmutableSDField field, Search search) {
if (!field.doesIndexing() &&
!field.isIndexStructureField())
{
return;
}
List<Field> lst = flattenField(field.asField());
if (lst.isEmpty()) {
return;
}
String fieldName = field.getName();
for (Field flatField : lst) {
deriveIndexFields(flatField, search);
}
if (lst.size() > 1) {
FieldSet fieldSet = new FieldSet(fieldName);
for (Field flatField : lst) {
fieldSet.addFieldName(flatField.getName());
}
fieldSets.put(fieldName, fieldSet);
}
}
private void deriveIndexFields(Field field, Search search) {
IndexField toAdd = new IndexField(field.getName(), Index.convertType(field.getDataType()), field.getDataType());
com.yahoo.searchdefinition.Index definedIndex = search.getIndex(field.getName());
if (definedIndex != null) {
toAdd.setIndexSettings(definedIndex);
}
fields.add(toAdd);
addFieldToCollection(field.getName(), field.getName()); // implicit
}
private FieldCollection getCollection(String collectionName) {
FieldCollection retval = collections.get(collectionName);
if (retval == null) {
collections.put(collectionName, new FieldCollection(collectionName));
return collections.get(collectionName);
}
return retval;
}
private void addFieldToCollection(String fieldName, String collectionName) {
FieldCollection collection = getCollection(collectionName);
collection.fields.add(fieldName);
}
@Override
protected void derive(ImmutableSDField field, Search search) {
if (field.usesStructOrMap()) {
return; // unsupported
}
deriveIndexFields(field, search);
}
@Override
protected String getDerivedName() {
return "indexschema";
}
@Override
public void getConfig(IndexschemaConfig.Builder icB) {
for (int i = 0; i < fields.size(); ++i) {
IndexField f = fields.get(i);
IndexschemaConfig.Indexfield.Builder ifB = new IndexschemaConfig.Indexfield.Builder()
.name(f.getName())
.datatype(IndexschemaConfig.Indexfield.Datatype.Enum.valueOf(f.getType()))
.prefix(f.hasPrefix())
.phrases(f.hasPhrases())
.positions(f.hasPositions());
if (!f.getCollectionType().equals("SINGLE")) {
ifB.collectiontype(IndexschemaConfig.Indexfield.Collectiontype.Enum.valueOf(f.getCollectionType()));
}
icB.indexfield(ifB);
}
for (FieldSet fieldSet : fieldSets.values()) {
IndexschemaConfig.Fieldset.Builder fsB = new IndexschemaConfig.Fieldset.Builder()
.name(fieldSet.getName());
for (String f : fieldSet.getFieldNames()) {
fsB.field(new IndexschemaConfig.Fieldset.Field.Builder()
.name(f));
}
icB.fieldset(fsB);
}
}
@SuppressWarnings("deprecation")
static List<Field> flattenField(Field field) {
DataType fieldType = field.getDataType();
if (fieldType.getPrimitiveType() != null){
return Collections.singletonList(field);
}
if (fieldType instanceof ArrayDataType) {
boolean header = field.isHeader();
List<Field> ret = new LinkedList<>();
Field innerField = new Field(field.getName(), ((ArrayDataType)fieldType).getNestedType(), header);
for (Field flatField : flattenField(innerField)) {
ret.add(new Field(flatField.getName(), DataType.getArray(flatField.getDataType()), header));
}
return ret;
}
if (fieldType instanceof StructuredDataType) {
List<Field> ret = new LinkedList<>();
String fieldName = field.getName();
for (Field childField : ((StructuredDataType)fieldType).getFields()) {
for (Field flatField : flattenField(childField)) {
ret.add(new Field(fieldName + "." + flatField.getName(), flatField));
}
}
return ret;
}
throw new UnsupportedOperationException(fieldType.getName());
}
public List<IndexField> getFields() {
return fields;
}
/**
* Representation of an index field with name and data type.
*/
public static class IndexField {
private String name;
private Index.Type type;
private com.yahoo.searchdefinition.Index.Type sdType; // The index type in "user intent land"
private DataType sdFieldType;
private boolean prefix = false;
private boolean phrases = false; // TODO dead, but keep a while to ensure config compatibility?
private boolean positions = true;// TODO dead, but keep a while to ensure config compatibility?
private BooleanIndexDefinition boolIndex = null;
public IndexField(String name, Index.Type type, DataType sdFieldType) {
this.name = name;
this.type = type;
this.sdFieldType = sdFieldType;
}
public void setIndexSettings(com.yahoo.searchdefinition.Index index) {
if (type.equals(Index.Type.TEXT)) {
prefix = index.isPrefix();
}
sdType = index.getType();
boolIndex = index.getBooleanIndexDefiniton();
}
public String getName() { return name; }
public Index.Type getRawType() { return type; }
public String getType() {
return type.equals(Index.Type.INT64)
? "INT64" : "STRING";
}
public String getCollectionType() {
return (sdFieldType == null)
? "SINGLE"
: (sdFieldType instanceof WeightedSetDataType)
? "WEIGHTEDSET"
: (sdFieldType instanceof ArrayDataType)
? "ARRAY"
: "SINGLE";
}
public boolean hasPrefix() { return prefix; }
public boolean hasPhrases() { return phrases; }
public boolean hasPositions() { return positions; }
public BooleanIndexDefinition getBooleanIndexDefinition() {
return boolIndex;
}
/**
* The user set index type
* @return the type
*/
public com.yahoo.searchdefinition.Index.Type getSdType() {
return sdType;
}
}
/**
* Representation of a collection of fields (aka index, physical view).
*/
@SuppressWarnings({ "UnusedDeclaration" })
private static class FieldCollection {
private final String name;
private final List<String> fields = new ArrayList<>();
FieldCollection(String name) {
this.name = name;
}
}
}
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