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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.update;
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.document.datatypes.Array;
import com.yahoo.document.datatypes.FieldValue;
import com.yahoo.document.datatypes.IntegerFieldValue;
import com.yahoo.document.datatypes.StringFieldValue;
import com.yahoo.document.datatypes.WeightedSet;
import com.yahoo.document.serialization.DocumentUpdateWriter;
/**
* <p>Value update that represents performing an encapsulated value update on a subvalue. Currently, there are
* two multi-value data types in Vespa, <em>array</em> and <em>weighted set</em>. </p>
*
* <ul>
* <li>For an array, the value
* must be an Integer, and the update must represent a legal operation on the subtype of the array. </li>
* <li>For a
* weighted set, the value must be a key of the same type as the subtype of the weighted set, and the update
* must represent a legal operation on an integer value.</li>
* </ul>
*
* @author Einar M R Rosenvinge
*/
public class MapValueUpdate extends ValueUpdate {
protected FieldValue value;
protected ValueUpdate update;
public MapValueUpdate(FieldValue value, ValueUpdate update) {
super(ValueUpdateClassID.MAP);
this.value = value;
this.update = update;
}
/** Returns the key of the nested update */
public FieldValue getValue() {
return value;
}
/** Sets the key of the nested update */
public void setValue(FieldValue value) {
this.value=value;
}
public ValueUpdate getUpdate() {
return update;
}
@Override
public FieldValue applyTo(FieldValue fval) {
if (fval instanceof Array) {
Array array = (Array) fval;
FieldValue element = array.getFieldValue(((IntegerFieldValue) value).getInteger());
element = update.applyTo(element);
array.set(((IntegerFieldValue) value).getInteger(), element);
} else if (fval instanceof WeightedSet) {
WeightedSet wset = (WeightedSet) fval;
WeightedSetDataType wtype = wset.getDataType();
Integer weight = wset.get(value);
if (weight == null) {
if (wtype.createIfNonExistent() && update instanceof ArithmeticValueUpdate) {
weight = 0;
} else {
return fval;
}
}
weight = (Integer) update.applyTo(new IntegerFieldValue(weight)).getWrappedValue();
wset.put(value, weight);
if (wtype.removeIfZero() && update instanceof ArithmeticValueUpdate && weight == 0) {
wset.remove(value);
}
}
return fval;
}
@Override
protected void checkCompatibility(DataType fieldType) {
if (fieldType instanceof ArrayDataType) {
if (!(value instanceof IntegerFieldValue)) {
throw new IllegalArgumentException("Expected integer, got " + value.getClass().getName() + ".");
}
update.checkCompatibility(((ArrayDataType)fieldType).getNestedType());
} else if (fieldType instanceof WeightedSetDataType) {
((WeightedSetDataType)fieldType).getNestedType().createFieldValue().assign(value);
update.checkCompatibility(DataType.INT);
} else if (fieldType instanceof StructuredDataType) {
if (!(value instanceof StringFieldValue)) {
throw new IllegalArgumentException("Expected string, got " + value.getClass().getName() + ".");
}
Field field = ((StructuredDataType)fieldType).getField(((StringFieldValue)value).getString());
if (field == null) {
throw new IllegalArgumentException("Field '" + value + "' not found.");
}
update.checkCompatibility(field.getDataType());
} else {
throw new UnsupportedOperationException("Field type " + fieldType.getName() + " not supported.");
}
}
@Override
public void serialize(DocumentUpdateWriter data, DataType superType) {
data.write(this, superType);
}
@Override
public boolean equals(Object o) {
return o instanceof MapValueUpdate && super.equals(o) && value.equals(((MapValueUpdate) o).value) &&
update.equals(((MapValueUpdate) o).update);
}
@Override
public int hashCode() {
return super.hashCode() + value.hashCode() + update.hashCode();
}
@Override
public String toString() {
return super.toString() + " " + value + " " + update;
}
}
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