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// Copyright 2017 Yahoo Inc. 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.ReferenceFieldValue;
import com.yahoo.vespa.objects.Ids;
/**
* A <code>ReferenceDataType</code> specifies a particular concrete document type that a
* {@link ReferenceFieldValue} instance binds to.
*
* @author vekterli
* @since 6.65
*/
public class ReferenceDataType extends DataType {
// Magic number for Identifiable, see document/util/identifiable.h
public static final int classId = registerClass(Ids.document + 68, ReferenceDataType.class);
private StructuredDataType targetType;
public ReferenceDataType(DocumentType targetType, int id) {
this((StructuredDataType)targetType, id);
}
/**
* Constructor used when building a multi document type model where the concrete instance
* of the target document type might not yet be known. The temporary data type should be
* replaced later using setTargetType().
*/
public ReferenceDataType(TemporaryStructuredDataType temporaryTargetType, int id) {
this((StructuredDataType) temporaryTargetType, id);
}
private ReferenceDataType(StructuredDataType targetType, int id) {
super(buildTypeName(targetType), id);
this.targetType = targetType;
}
private ReferenceDataType(StructuredDataType targetType) {
this(targetType, buildTypeName(targetType).hashCode());
}
private static String buildTypeName(StructuredDataType targetType) {
return "Reference<" + targetType.getName() + ">";
}
/**
* Creates a new type where the numeric ID is based on the hash of targetType
*/
public static ReferenceDataType createWithInferredId(DocumentType targetType) {
return new ReferenceDataType(targetType);
}
/**
* Creates a new type where the numeric ID is based on the hash of targetType
*/
public static ReferenceDataType createWithInferredId(TemporaryStructuredDataType targetType) {
return new ReferenceDataType(targetType);
}
public StructuredDataType getTargetType() { return targetType; }
/**
* Overrides the stored temporary data type with a concrete StructuredDataType instance. Should only
* be invoked from configuration or model code when resolving temporary types.
*
* @throws IllegalStateException if the previously stored target type is already a concrete
* instance (not TemporaryStructuredDataType).
*/
public void setTargetType(StructuredDataType targetType) {
if (! (this.targetType instanceof TemporaryStructuredDataType)) {
throw new IllegalStateException(String.format(
"Unexpected attempt to replace already concrete target " +
"type in ReferenceDataType instance (type is '%s')", this.targetType.getName()));
}
this.targetType = targetType;
}
@Override
public ReferenceFieldValue createFieldValue() {
return new ReferenceFieldValue(this);
}
@Override
public Class<? extends ReferenceFieldValue> getValueClass() {
return ReferenceFieldValue.class;
}
@Override
public boolean isValueCompatible(FieldValue value) {
if (value == null) {
return false;
}
if (!ReferenceFieldValue.class.isAssignableFrom(value.getClass())) {
return false;
}
ReferenceFieldValue rhs = (ReferenceFieldValue)value;
return rhs.getDataType().equals(this);
}
}
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