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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.document;
import com.yahoo.document.datatypes.FieldValue;
import com.yahoo.document.datatypes.Struct;
import com.yahoo.vespa.objects.Ids;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
/**
* @author Einar M R Rosenvinge
*/
public class StructDataType extends BaseStructDataType {
public static final int classId = registerClass(Ids.document + 57, StructDataType.class);
private StructDataType superType = null;
public StructDataType(String name) {
super(name);
}
public StructDataType(int id, String name) {
super(id, name);
}
@Override
public Struct createFieldValue() {
return new Struct(this);
}
@Override
public FieldValue createFieldValue(Object o) {
Struct struct;
if (o.getClass().equals(Struct.class)) {
struct = new Struct(this);
} else {
// This indicates for example that o is a generated struct subtype, try the empty constructor
try {
struct = (Struct) o.getClass().getConstructor().newInstance();
} catch (Exception e) {
// Fallback, let assign handle the error if o is completely bogus
struct = new Struct(this);
}
}
struct.assign(o);
return struct;
}
@Override
public StructDataType clone() {
StructDataType type = (StructDataType) super.clone();
type.superType = this.superType;
return type;
}
public void assign(StructDataType type) {
super.assign(type);
superType = type.superType;
}
@Override
public Field getField(String fieldName) {
Field f = super.getField(fieldName);
if (f == null && superType != null) {
f = superType.getField(fieldName);
}
return f;
}
@Override
public Field getField(int id) {
Field f = super.getField(id);
if (f == null && superType != null) {
f = superType.getField(id);
}
return f;
}
@Override
public void addField(Field field) {
if (hasField(field)) {
throw new IllegalArgumentException("Struct already has field " + field);
}
if ((superType != null) && superType.hasField(field)) {
throw new IllegalArgumentException(field.toString() + " already present in inherited type '" + superType.toString() + "', " + this.toString() + " cannot override.");
}
super.addField(field);
}
@Override
public Collection<Field> getFields() {
if (superType == null) {
return Collections.unmodifiableCollection(super.getFields());
}
Collection<Field> fieldsBuilder = new ArrayList<>();
fieldsBuilder.addAll(super.getFields());
fieldsBuilder.addAll(superType.getFields());
return List.copyOf(fieldsBuilder);
}
public Collection<Field> getFieldsThisTypeOnly() {
return Collections.unmodifiableCollection(super.getFields());
}
@Override
public int getFieldCount() {
return getFields().size();
}
@Override
public Class getValueClass() {
return Struct.class;
}
@Override
public boolean isValueCompatible(FieldValue value) {
if (!(value instanceof Struct structValue)) {
return false;
}
if (structValue.getDataType().inherits(this)) {
//the value is of this type; or the supertype of the value is of this type, etc....
return true;
}
return false;
}
public void inherit(StructDataType type) {
if (superType != null) {
throw new IllegalArgumentException("Already inherits type " + superType + ", multiple inheritance not currently supported.");
}
for (Field f : type.getFields()) {
if (hasField(f)) {
throw new IllegalArgumentException(f + " already present in " + type + ", " + this + " cannot inherit from it");
}
}
superType = type;
}
public Collection<StructDataType> getInheritedTypes() {
if (superType == null) {
return List.of();
}
return List.of(superType);
}
public boolean inherits(StructDataType type) {
if (equals(type)) return true;
if (superType != null && superType.inherits(type)) return true;
return false;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof StructDataType that)) return false;
if (!super.equals(o)) return false;
if (superType != null ? !superType.equals(that.superType) : that.superType != null) return false;
return true;
}
@Override
public int hashCode() {
int result = super.hashCode();
result = 31 * result + (superType != null ? superType.hashCode() : 0);
return result;
}
}
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